| Message ID | 20210117042539.1609-2-alistair@alistair23.me |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
On Sat, 16 Jan 2021, Alistair Francis wrote: > Initial support for the Silergy SY7636A Power Management chip > driver. Please remove "driver", as this is not support for the driver, it *is* the driver which supports the chip. > Signed-off-by: Alistair Francis <alistair@alistair23.me> > --- > drivers/mfd/Kconfig | 10 ++ > drivers/mfd/Makefile | 2 + > drivers/mfd/sy7636a.c | 252 ++++++++++++++++++++++++++++++++++++ > include/linux/mfd/sy7636a.h | 50 +++++++ > 4 files changed, 314 insertions(+) > create mode 100644 drivers/mfd/sy7636a.c > create mode 100644 include/linux/mfd/sy7636a.h > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index bdfce7b15621..c8c62d92433c 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -1360,6 +1360,16 @@ config MFD_SYSCON > Select this option to enable accessing system control registers > via regmap. > > +config MFD_SY7636A > + tristate "Silergy SY7636A Power Management chip driver" Again, please remove the word "driver" here. > + select MFD_CORE > + select REGMAP_I2C > + select REGMAP_IRQ > + depends on I2C=y > + help > + Select this option to enable support for the Silergy SY7636A > + Power Management chip driver. And again. > config MFD_DAVINCI_VOICECODEC > tristate > select MFD_CORE > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index 14fdb188af02..1fa1e635f506 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -265,6 +265,8 @@ obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o > obj-$(CONFIG_MFD_STMFX) += stmfx.o > obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o > > +obj-$(CONFIG_MFD_SY7636A) += sy7636a.o > + Why does this have to be segregated? > obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o > obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o > obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o > diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c > new file mode 100644 > index 000000000000..39aac965d854 > --- /dev/null > +++ b/drivers/mfd/sy7636a.c > @@ -0,0 +1,252 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * MFD driver for SY7636A chip "Parent driver". > + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ This is quite out of date. Please update. > + * Author: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com> > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License as > + * published by the Free Software Foundation version 2. > + * > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any > + * kind, whether express or implied; without even the implied warranty > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. This test is replaced by the SPDX header above. > + * Based on the lp87565 driver by Keerthy <j-keerthy@ti.com> > + */ > + > +#include <linux/interrupt.h> > +#include <linux/mfd/core.h> > +#include <linux/module.h> > +#include <linux/of_device.h> > +#include <linux/regmap.h> > +#include <linux/sysfs.h> > + > +#include <linux/mfd/sy7636a.h> > + > +static const struct regmap_config sy7636a_regmap_config = { > + .reg_bits = 8, > + .val_bits = 8, > +}; > + > +static const struct mfd_cell sy7636a_cells[] = { > + { .name = "sy7636a-regulator", }, > + { .name = "sy7636a-temperature", }, > + { .name = "sy7636a-thermal", }, > +}; > + > +static const struct of_device_id of_sy7636a_match_table[] = { > + { .compatible = "silergy,sy7636a", }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, of_sy7636a_match_table); Please move this to where it is used i.e. at the bottom of the file. > +static const char * const states[] = { > + "no fault event", > + "UVP at VP rail", > + "UVP at VN rail", > + "UVP at VPOS rail", > + "UVP at VNEG rail", > + "UVP at VDDH rail", > + "UVP at VEE rail", > + "SCP at VP rail", > + "SCP at VN rail", > + "SCP at VPOS rail", > + "SCP at VNEG rail", > + "SCP at VDDH rail", > + "SCP at VEE rail", > + "SCP at V COM rail", > + "UVLO", > + "Thermal shutdown", > +}; > + > +int get_vcom_voltage_mv(struct regmap *regmap) > +{ > + int ret; > + unsigned int val, val_h; > + > + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); > + if (ret) > + return ret; > + > + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); > + if (ret) > + return ret; > + > + val |= (val_h << 8); Please define the shifts and masks. > + return (val & 0x1FF) * 10; What's 10? > +} > + > +int set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom) > +{ > + int ret; > + unsigned int val; > + > + if (vcom < 0 || vcom > 5000) Please define min/max values. > + return -EINVAL; > + > + val = (unsigned int)(vcom / 10) & 0x1ff; As above. > + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, val); > + if (ret) > + return ret; > + > + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, val >> 8); > + if (ret) > + return ret; > + > + return 0; > +} Who calls these? > +static ssize_t state_show(struct device *dev, struct device_attribute *attr, > + char *buf) > +{ > + int ret; > + unsigned int val; > + struct sy7636a *sy7636a = dev_get_drvdata(dev); > + > + ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val); > + if (ret) { > + dev_err(sy7636a->dev, "Failed to read from device\n"); > + return ret; > + } > + > + val = val >> 1; Why 1? > + if (val >= ARRAY_SIZE(states)) { > + dev_err(sy7636a->dev, "Unexpected value read from device: %u\n", val); > + return -EINVAL; > + } > + > + return snprintf(buf, PAGE_SIZE, "%s\n", states[val]); > +} > +static DEVICE_ATTR(state, 0444, state_show, NULL); You need to document new sysfs entries. > +static ssize_t power_good_show(struct device *dev, struct device_attribute *attr, > + char *buf) > +{ > + int ret; > + unsigned int val; > + struct sy7636a *sy7636a = dev_get_drvdata(dev); > + > + ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val); > + if (ret) { > + dev_err(sy7636a->dev, "Failed to read from device\n"); > + return ret; > + } > + > + val &= 0x01; > + > + return snprintf(buf, PAGE_SIZE, "%s\n", val ? "ON" : "OFF"); Doesn't 0 just mean "no fault event"? > +} > +static DEVICE_ATTR(power_good, 0444, power_good_show, NULL); > + > +static ssize_t vcom_show(struct device *dev, struct device_attribute *attr, > + char *buf) > +{ > + int ret; > + struct sy7636a *sy7636a = dev_get_drvdata(dev); > + > + ret = get_vcom_voltage_mv(sy7636a->regmap); > + if (ret < 0) > + return ret; > + > + return snprintf(buf, PAGE_SIZE, "%d\n", -ret); > +} > + Remove this line please. > +static ssize_t vcom_store(struct device *dev, > + struct device_attribute *attr, const char *buf, size_t count) > +{ > + int ret; > + int vcom; > + struct sy7636a *sy7636a = dev_get_drvdata(dev); > + > + ret = kstrtoint(buf, 0, &vcom); > + if (ret) > + return ret; > + > + if (vcom > 0 || vcom < -5000) > + return -EINVAL; > + > + ret = set_vcom_voltage_mv(sy7636a->regmap, (unsigned int)(-vcom)); > + if (ret) > + return ret; > + > + return count; > +} > +static DEVICE_ATTR(vcom, 0644, vcom_show, vcom_store); > + > +static struct attribute *sy7636a_sysfs_attrs[] = { > + &dev_attr_state.attr, > + &dev_attr_power_good.attr, > + &dev_attr_vcom.attr, > + NULL, > +}; These all look like power options? Do they really belong here? > +static const struct attribute_group sy7636a_sysfs_attr_group = { > + .attrs = sy7636a_sysfs_attrs, > +}; > + > +static int sy7636a_probe(struct i2c_client *client, > + const struct i2c_device_id *ids) > +{ > + struct sy7636a *sy7636a; > + int ret; > + > + sy7636a = devm_kzalloc(&client->dev, sizeof(struct sy7636a), GFP_KERNEL); sizeof(*sy7636a) > + if (sy7636a == NULL) if (!sy7636a) > + return -ENOMEM; > + > + sy7636a->dev = &client->dev; > + > + sy7636a->regmap = devm_regmap_init_i2c(client, &sy7636a_regmap_config); > + if (IS_ERR(sy7636a->regmap)) { > + ret = PTR_ERR(sy7636a->regmap); > + dev_err(sy7636a->dev, > + "Failed to initialize register map: %d\n", ret); > + return ret; > + } > + > + i2c_set_clientdata(client, sy7636a); > + > + ret = sysfs_create_group(&client->dev.kobj, &sy7636a_sysfs_attr_group); > + if (ret) { > + dev_err(sy7636a->dev, "Failed to create sysfs attributes\n"); > + return ret; > + } > + > + ret = devm_mfd_add_devices(sy7636a->dev, PLATFORM_DEVID_AUTO, > + sy7636a_cells, ARRAY_SIZE(sy7636a_cells), > + NULL, 0, NULL); > + if (ret) { > + dev_err(sy7636a->dev, "Failed to add mfd devices\n"); "Failed to add child devices" > + sysfs_remove_group(&client->dev.kobj, &sy7636a_sysfs_attr_group); > + return ret; > + } > + > + return 0; > +} > + > +static const struct i2c_device_id sy7636a_id_table[] = { > + { "sy7636a", 0 }, > + { }, > +}; > +MODULE_DEVICE_TABLE(i2c, sy7636a_id_table); If you use .probe2, you can omit this table. > +static struct i2c_driver sy7636a_driver = { > + .driver = { > + .name = "sy7636a", > + .of_match_table = of_sy7636a_match_table, > + }, > + .probe = sy7636a_probe, > + .id_table = sy7636a_id_table, > +}; > +module_i2c_driver(sy7636a_driver); > + > +MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>"); > +MODULE_DESCRIPTION("Silergy SY7636A Multi-Function Device Driver"); s/Multi-Function Device Driver/Power Management Chip/ > +MODULE_LICENSE("GPL v2"); > diff --git a/include/linux/mfd/sy7636a.h b/include/linux/mfd/sy7636a.h > new file mode 100644 > index 000000000000..642789c4d0a9 > --- /dev/null > +++ b/include/linux/mfd/sy7636a.h > @@ -0,0 +1,50 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Functions to access SY3686A power management chip. > + * > + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License as > + * published by the Free Software Foundation version 2. > + * > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any > + * kind, whether express or implied; without even the implied warranty > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ Same issues as mentioned above. > +#ifndef __LINUX_MFD_SY7636A_H > +#define __LINUX_MFD_SY7636A_H Just MFD is fine. > +#include <linux/i2c.h> > +#include <linux/regulator/driver.h> > +#include <linux/regulator/machine.h> > +#include <linux/regmap.h> Alphabetical. > +#define SY7636A_REG_OPERATION_MODE_CRL 0x00 > +#define SY7636A_OPERATION_MODE_CRL_VCOMCTL (1 << 6) > +#define SY7636A_OPERATION_MODE_CRL_ONOFF (1 << 7) > +#define SY7636A_REG_VCOM_ADJUST_CTRL_L 0x01 > +#define SY7636A_REG_VCOM_ADJUST_CTRL_H 0x02 > +#define SY7636A_REG_VCOM_ADJUST_CTRL_MASK 0x01ff > +#define SY7636A_REG_VLDO_VOLTAGE_ADJULST_CTRL 0x03 > +#define SY7636A_REG_POWER_ON_DELAY_TIME 0x06 > +#define SY7636A_REG_FAULT_FLAG 0x07 > +#define SY7636A_FAULT_FLAG_PG (1 << 0) > +#define SY7636A_REG_TERMISTOR_READOUT 0x08 Tab out the values please. Use BIT() > +#define SY7636A_REG_MAX 0x08 > + > +struct sy7636a { > + struct device *dev; > + struct regmap *regmap; > + unsigned int vcom; Where is this used? > + struct gpio_desc *pgood_gpio; Where is this used? > + struct mutex reglock; Where is this used? > +}; > + > +int get_vcom_voltage_mv(struct regmap *regmap); > +int set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom); What calls these? > +#endif /* __LINUX_MFD_SY7636A_H */ -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
On Thu, Feb 4, 2021 at 5:31 AM Lee Jones <lee.jones@linaro.org> wrote: > > On Sat, 16 Jan 2021, Alistair Francis wrote: > > > Initial support for the Silergy SY7636A Power Management chip > > driver. > > Please remove "driver", as this is not support for the driver, it *is* > the driver which supports the chip. Sorry for the long delay here. I have addressed your comments. > > > Signed-off-by: Alistair Francis <alistair@alistair23.me> > > --- > > drivers/mfd/Kconfig | 10 ++ > > drivers/mfd/Makefile | 2 + > > drivers/mfd/sy7636a.c | 252 ++++++++++++++++++++++++++++++++++++ > > include/linux/mfd/sy7636a.h | 50 +++++++ > > 4 files changed, 314 insertions(+) > > create mode 100644 drivers/mfd/sy7636a.c > > create mode 100644 include/linux/mfd/sy7636a.h > > > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > > index bdfce7b15621..c8c62d92433c 100644 > > --- a/drivers/mfd/Kconfig > > +++ b/drivers/mfd/Kconfig > > @@ -1360,6 +1360,16 @@ config MFD_SYSCON > > Select this option to enable accessing system control registers > > via regmap. > > > > +config MFD_SY7636A > > + tristate "Silergy SY7636A Power Management chip driver" > > Again, please remove the word "driver" here. > > > + select MFD_CORE > > + select REGMAP_I2C > > + select REGMAP_IRQ > > + depends on I2C=y > > + help > > + Select this option to enable support for the Silergy SY7636A > > + Power Management chip driver. > > And again. I removed "driver" from all of these. > > > config MFD_DAVINCI_VOICECODEC > > tristate > > select MFD_CORE > > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > > index 14fdb188af02..1fa1e635f506 100644 > > --- a/drivers/mfd/Makefile > > +++ b/drivers/mfd/Makefile > > @@ -265,6 +265,8 @@ obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o > > obj-$(CONFIG_MFD_STMFX) += stmfx.o > > obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o > > > > +obj-$(CONFIG_MFD_SY7636A) += sy7636a.o > > + > > Why does this have to be segregated? Fixed > > > obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o > > obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o > > obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o > > diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c > > new file mode 100644 > > index 000000000000..39aac965d854 > > --- /dev/null > > +++ b/drivers/mfd/sy7636a.c > > @@ -0,0 +1,252 @@ > > +// SPDX-License-Identifier: GPL-2.0+ > > +/* > > + * MFD driver for SY7636A chip > > "Parent driver". > > > + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ > > This is quite out of date. Please update. I don't own this copyright, so I would rather not change it. > > > + * Author: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com> > > + * > > + * This program is free software; you can redistribute it and/or > > + * modify it under the terms of the GNU General Public License as > > + * published by the Free Software Foundation version 2. > > + * > > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any > > + * kind, whether express or implied; without even the implied warranty > > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > > + * GNU General Public License for more details. > > This test is replaced by the SPDX header above. Removed. > > > + * Based on the lp87565 driver by Keerthy <j-keerthy@ti.com> > > + */ > > + > > +#include <linux/interrupt.h> > > +#include <linux/mfd/core.h> > > +#include <linux/module.h> > > +#include <linux/of_device.h> > > +#include <linux/regmap.h> > > +#include <linux/sysfs.h> > > + > > +#include <linux/mfd/sy7636a.h> > > + > > +static const struct regmap_config sy7636a_regmap_config = { > > + .reg_bits = 8, > > + .val_bits = 8, > > +}; > > + > > +static const struct mfd_cell sy7636a_cells[] = { > > + { .name = "sy7636a-regulator", }, > > + { .name = "sy7636a-temperature", }, > > + { .name = "sy7636a-thermal", }, > > +}; > > + > > +static const struct of_device_id of_sy7636a_match_table[] = { > > + { .compatible = "silergy,sy7636a", }, > > + {} > > +}; > > +MODULE_DEVICE_TABLE(of, of_sy7636a_match_table); > > Please move this to where it is used i.e. at the bottom of the file. Done. > > > +static const char * const states[] = { > > + "no fault event", > > + "UVP at VP rail", > > + "UVP at VN rail", > > + "UVP at VPOS rail", > > + "UVP at VNEG rail", > > + "UVP at VDDH rail", > > + "UVP at VEE rail", > > + "SCP at VP rail", > > + "SCP at VN rail", > > + "SCP at VPOS rail", > > + "SCP at VNEG rail", > > + "SCP at VDDH rail", > > + "SCP at VEE rail", > > + "SCP at V COM rail", > > + "UVLO", > > + "Thermal shutdown", > > +}; > > + > > +int get_vcom_voltage_mv(struct regmap *regmap) > > +{ > > + int ret; > > + unsigned int val, val_h; > > + > > + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); > > + if (ret) > > + return ret; > > + > > + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); > > + if (ret) > > + return ret; > > + > > + val |= (val_h << 8); > > Please define the shifts and masks. > > > + return (val & 0x1FF) * 10; > > What's 10? > > > +} > > + > > +int set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom) > > +{ > > + int ret; > > + unsigned int val; > > + > > + if (vcom < 0 || vcom > 5000) > > Please define min/max values. > > > + return -EINVAL; > > + > > + val = (unsigned int)(vcom / 10) & 0x1ff; > > As above. I have used defines for all of these. > > > + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, val); > > + if (ret) > > + return ret; > > + > > + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, val >> 8); > > + if (ret) > > + return ret; > > + > > + return 0; > > +} > > Who calls these? They sysfs store and show functions. > > > +static ssize_t state_show(struct device *dev, struct device_attribute *attr, > > + char *buf) > > +{ > > + int ret; > > + unsigned int val; > > + struct sy7636a *sy7636a = dev_get_drvdata(dev); > > + > > + ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val); > > + if (ret) { > > + dev_err(sy7636a->dev, "Failed to read from device\n"); > > + return ret; > > + } > > + > > + val = val >> 1; > > Why 1? I used a define here to make it clearer > > > + if (val >= ARRAY_SIZE(states)) { > > + dev_err(sy7636a->dev, "Unexpected value read from device: %u\n", val); > > + return -EINVAL; > > + } > > + > > + return snprintf(buf, PAGE_SIZE, "%s\n", states[val]); > > +} > > +static DEVICE_ATTR(state, 0444, state_show, NULL); > > You need to document new sysfs entries. I'm not sure how to document this. Do you mind pointing out an example I can use? > > > +static ssize_t power_good_show(struct device *dev, struct device_attribute *attr, > > + char *buf) > > +{ > > + int ret; > > + unsigned int val; > > + struct sy7636a *sy7636a = dev_get_drvdata(dev); > > + > > + ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val); > > + if (ret) { > > + dev_err(sy7636a->dev, "Failed to read from device\n"); > > + return ret; > > + } > > + > > + val &= 0x01; > > + > > + return snprintf(buf, PAGE_SIZE, "%s\n", val ? "ON" : "OFF"); > > Doesn't 0 just mean "no fault event"? The LSB is reserved, so we don't clear that. > > > +} > > +static DEVICE_ATTR(power_good, 0444, power_good_show, NULL); > > + > > +static ssize_t vcom_show(struct device *dev, struct device_attribute *attr, > > + char *buf) > > +{ > > + int ret; > > + struct sy7636a *sy7636a = dev_get_drvdata(dev); > > + > > + ret = get_vcom_voltage_mv(sy7636a->regmap); > > + if (ret < 0) > > + return ret; > > + > > + return snprintf(buf, PAGE_SIZE, "%d\n", -ret); > > +} > > + > > Remove this line please. > > > +static ssize_t vcom_store(struct device *dev, > > + struct device_attribute *attr, const char *buf, size_t count) > > +{ > > + int ret; > > + int vcom; > > + struct sy7636a *sy7636a = dev_get_drvdata(dev); > > + > > + ret = kstrtoint(buf, 0, &vcom); > > + if (ret) > > + return ret; > > + > > + if (vcom > 0 || vcom < -5000) > > + return -EINVAL; > > + > > + ret = set_vcom_voltage_mv(sy7636a->regmap, (unsigned int)(-vcom)); > > + if (ret) > > + return ret; > > + > > + return count; > > +} > > +static DEVICE_ATTR(vcom, 0644, vcom_show, vcom_store); > > + > > +static struct attribute *sy7636a_sysfs_attrs[] = { > > + &dev_attr_state.attr, > > + &dev_attr_power_good.attr, > > + &dev_attr_vcom.attr, > > + NULL, > > +}; > > These all look like power options? Do they really belong here? From what I can tell I think they do. Let me know if you don't think so. > > > +static const struct attribute_group sy7636a_sysfs_attr_group = { > > + .attrs = sy7636a_sysfs_attrs, > > +}; > > + > > +static int sy7636a_probe(struct i2c_client *client, > > + const struct i2c_device_id *ids) > > +{ > > + struct sy7636a *sy7636a; > > + int ret; > > + > > + sy7636a = devm_kzalloc(&client->dev, sizeof(struct sy7636a), GFP_KERNEL); > > sizeof(*sy7636a) > > > + if (sy7636a == NULL) > > if (!sy7636a) > > > + return -ENOMEM; > > + > > + sy7636a->dev = &client->dev; > > + > > + sy7636a->regmap = devm_regmap_init_i2c(client, &sy7636a_regmap_config); > > + if (IS_ERR(sy7636a->regmap)) { > > + ret = PTR_ERR(sy7636a->regmap); > > + dev_err(sy7636a->dev, > > + "Failed to initialize register map: %d\n", ret); > > + return ret; > > + } > > + > > + i2c_set_clientdata(client, sy7636a); > > + > > + ret = sysfs_create_group(&client->dev.kobj, &sy7636a_sysfs_attr_group); > > + if (ret) { > > + dev_err(sy7636a->dev, "Failed to create sysfs attributes\n"); > > + return ret; > > + } > > + > > + ret = devm_mfd_add_devices(sy7636a->dev, PLATFORM_DEVID_AUTO, > > + sy7636a_cells, ARRAY_SIZE(sy7636a_cells), > > + NULL, 0, NULL); > > + if (ret) { > > + dev_err(sy7636a->dev, "Failed to add mfd devices\n"); > > "Failed to add child devices" > > > + sysfs_remove_group(&client->dev.kobj, &sy7636a_sysfs_attr_group); > > + return ret; > > + } > > + > > + return 0; > > +} > > + > > +static const struct i2c_device_id sy7636a_id_table[] = { > > + { "sy7636a", 0 }, > > + { }, > > +}; > > +MODULE_DEVICE_TABLE(i2c, sy7636a_id_table); > > If you use .probe2, you can omit this table. > > > +static struct i2c_driver sy7636a_driver = { > > + .driver = { > > + .name = "sy7636a", > > + .of_match_table = of_sy7636a_match_table, > > + }, > > + .probe = sy7636a_probe, > > + .id_table = sy7636a_id_table, > > +}; > > +module_i2c_driver(sy7636a_driver); > > + > > +MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>"); > > +MODULE_DESCRIPTION("Silergy SY7636A Multi-Function Device Driver"); > > s/Multi-Function Device Driver/Power Management Chip/ > > > +MODULE_LICENSE("GPL v2"); > > diff --git a/include/linux/mfd/sy7636a.h b/include/linux/mfd/sy7636a.h > > new file mode 100644 > > index 000000000000..642789c4d0a9 > > --- /dev/null > > +++ b/include/linux/mfd/sy7636a.h > > @@ -0,0 +1,50 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > +/* > > + * Functions to access SY3686A power management chip. > > + * > > + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ > > + * > > + * This program is free software; you can redistribute it and/or > > + * modify it under the terms of the GNU General Public License as > > + * published by the Free Software Foundation version 2. > > + * > > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any > > + * kind, whether express or implied; without even the implied warranty > > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > > + * GNU General Public License for more details. > > + */ > > Same issues as mentioned above. > > > +#ifndef __LINUX_MFD_SY7636A_H > > +#define __LINUX_MFD_SY7636A_H > > Just MFD is fine. > > > +#include <linux/i2c.h> > > +#include <linux/regulator/driver.h> > > +#include <linux/regulator/machine.h> > > +#include <linux/regmap.h> > > Alphabetical. > > > +#define SY7636A_REG_OPERATION_MODE_CRL 0x00 > > +#define SY7636A_OPERATION_MODE_CRL_VCOMCTL (1 << 6) > > +#define SY7636A_OPERATION_MODE_CRL_ONOFF (1 << 7) > > +#define SY7636A_REG_VCOM_ADJUST_CTRL_L 0x01 > > +#define SY7636A_REG_VCOM_ADJUST_CTRL_H 0x02 > > +#define SY7636A_REG_VCOM_ADJUST_CTRL_MASK 0x01ff > > +#define SY7636A_REG_VLDO_VOLTAGE_ADJULST_CTRL 0x03 > > +#define SY7636A_REG_POWER_ON_DELAY_TIME 0x06 > > +#define SY7636A_REG_FAULT_FLAG 0x07 > > +#define SY7636A_FAULT_FLAG_PG (1 << 0) > > +#define SY7636A_REG_TERMISTOR_READOUT 0x08 > > Tab out the values please. > > Use BIT() > > > +#define SY7636A_REG_MAX 0x08 > > + > > +struct sy7636a { > > + struct device *dev; > > + struct regmap *regmap; > > + unsigned int vcom; > > Where is this used? > > > + struct gpio_desc *pgood_gpio; > > Where is this used? > > > + struct mutex reglock; > > Where is this used? I have removed these. > > > +}; > > + > > +int get_vcom_voltage_mv(struct regmap *regmap); > > +int set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom); > > What calls these? I have just made these internal to the driver. Alistair > > > +#endif /* __LINUX_MFD_SY7636A_H */ > > -- > Lee Jones [李琼斯] > Senior Technical Lead - Developer Services > Linaro.org │ Open source software for Arm SoCs > Follow Linaro: Facebook | Twitter | Blog
On Sat, 20 Mar 2021, Alistair Francis wrote: > On Thu, Feb 4, 2021 at 5:31 AM Lee Jones <lee.jones@linaro.org> wrote: > > > > On Sat, 16 Jan 2021, Alistair Francis wrote: > > > > > Initial support for the Silergy SY7636A Power Management chip > > > driver. > > > > Please remove "driver", as this is not support for the driver, it *is* > > the driver which supports the chip. > > Sorry for the long delay here. > > I have addressed your comments. [...] > > > diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c > > > new file mode 100644 > > > index 000000000000..39aac965d854 > > > --- /dev/null > > > +++ b/drivers/mfd/sy7636a.c > > > @@ -0,0 +1,252 @@ > > > +// SPDX-License-Identifier: GPL-2.0+ > > > +/* > > > + * MFD driver for SY7636A chip > > > > "Parent driver". > > > > > + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ > > > > This is quite out of date. Please update. > > I don't own this copyright, so I would rather not change it. I'm not comfortable taking a new driver with an old Copyright. Maybe ask reMarkable if it's okay to bump it. > > > + * Author: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com> Or ping this guy. [...] > > > +int set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom) > > > +{ > > > + int ret; > > > + unsigned int val; > > > + > > > + if (vcom < 0 || vcom > 5000) > > > > Please define min/max values. > > > > > + return -EINVAL; > > > + > > > + val = (unsigned int)(vcom / 10) & 0x1ff; > > > > As above. > > I have used defines for all of these. > > > > > > + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, val); > > > + if (ret) > > > + return ret; > > > + > > > + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, val >> 8); > > > + if (ret) > > > + return ret; > > > + > > > + return 0; > > > +} > > > > Who calls these? > > They sysfs store and show functions. They should be in a power/regulator driver really. [...] > > > + if (val >= ARRAY_SIZE(states)) { > > > + dev_err(sy7636a->dev, "Unexpected value read from device: %u\n", val); > > > + return -EINVAL; > > > + } > > > + > > > + return snprintf(buf, PAGE_SIZE, "%s\n", states[val]); > > > +} > > > +static DEVICE_ATTR(state, 0444, state_show, NULL); > > > > You need to document new sysfs entries. > > I'm not sure how to document this. Do you mind pointing out an example > I can use? See the final paragraph in: Documentation/filesystems/sysfs.rst [...] > > > +static struct attribute *sy7636a_sysfs_attrs[] = { > > > + &dev_attr_state.attr, > > > + &dev_attr_power_good.attr, > > > + &dev_attr_vcom.attr, > > > + NULL, > > > +}; > > > > These all look like power options? Do they really belong here? > > From what I can tell I think they do. Let me know if you don't think so. As above, I think they should be in power or regulator. [...] -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
On Tue, Mar 23, 2021 at 5:35 AM Lee Jones <lee.jones@linaro.org> wrote: > > On Sat, 20 Mar 2021, Alistair Francis wrote: > > > On Thu, Feb 4, 2021 at 5:31 AM Lee Jones <lee.jones@linaro.org> wrote: > > > > > > On Sat, 16 Jan 2021, Alistair Francis wrote: > > > > > > > Initial support for the Silergy SY7636A Power Management chip > > > > driver. > > > > > > Please remove "driver", as this is not support for the driver, it *is* > > > the driver which supports the chip. > > > > Sorry for the long delay here. > > > > I have addressed your comments. > > [...] > > > > > diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c > > > > new file mode 100644 > > > > index 000000000000..39aac965d854 > > > > --- /dev/null > > > > +++ b/drivers/mfd/sy7636a.c > > > > @@ -0,0 +1,252 @@ > > > > +// SPDX-License-Identifier: GPL-2.0+ > > > > +/* > > > > + * MFD driver for SY7636A chip > > > > > > "Parent driver". > > > > > > > + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ > > > > > > This is quite out of date. Please update. > > > > I don't own this copyright, so I would rather not change it. > > I'm not comfortable taking a new driver with an old Copyright. > > Maybe ask reMarkable if it's okay to bump it. > > > > > + * Author: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com> > > Or ping this guy. I reached out to him and have permission to bump the year. > > [...] > > > > > +int set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom) > > > > +{ > > > > + int ret; > > > > + unsigned int val; > > > > + > > > > + if (vcom < 0 || vcom > 5000) > > > > > > Please define min/max values. > > > > > > > + return -EINVAL; > > > > + > > > > + val = (unsigned int)(vcom / 10) & 0x1ff; > > > > > > As above. > > > > I have used defines for all of these. > > > > > > > > > + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, val); > > > > + if (ret) > > > > + return ret; > > > > + > > > > + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, val >> 8); > > > > + if (ret) > > > > + return ret; > > > > + > > > > + return 0; > > > > +} > > > > > > Who calls these? > > > > They sysfs store and show functions. > > They should be in a power/regulator driver really. Ok, I have moved these to the regulator. > > [...] > > > > > + if (val >= ARRAY_SIZE(states)) { > > > > + dev_err(sy7636a->dev, "Unexpected value read from device: %u\n", val); > > > > + return -EINVAL; > > > > + } > > > > + > > > > + return snprintf(buf, PAGE_SIZE, "%s\n", states[val]); > > > > +} > > > > +static DEVICE_ATTR(state, 0444, state_show, NULL); > > > > > > You need to document new sysfs entries. > > > > I'm not sure how to document this. Do you mind pointing out an example > > I can use? > > See the final paragraph in: > > Documentation/filesystems/sysfs.rst Thanks! > > [...] > > > > > +static struct attribute *sy7636a_sysfs_attrs[] = { > > > > + &dev_attr_state.attr, > > > > + &dev_attr_power_good.attr, > > > > + &dev_attr_vcom.attr, > > > > + NULL, > > > > +}; > > > > > > These all look like power options? Do they really belong here? > > > > From what I can tell I think they do. Let me know if you don't think so. > > As above, I think they should be in power or regulator. Done. Alistair > > [...] > > -- > Lee Jones [李琼斯] > Senior Technical Lead - Developer Services > Linaro.org │ Open source software for Arm SoCs > Follow Linaro: Facebook | Twitter | Blog
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index bdfce7b15621..c8c62d92433c 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1360,6 +1360,16 @@ config MFD_SYSCON Select this option to enable accessing system control registers via regmap. +config MFD_SY7636A + tristate "Silergy SY7636A Power Management chip driver" + select MFD_CORE + select REGMAP_I2C + select REGMAP_IRQ + depends on I2C=y + help + Select this option to enable support for the Silergy SY7636A + Power Management chip driver. + config MFD_DAVINCI_VOICECODEC tristate select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 14fdb188af02..1fa1e635f506 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -265,6 +265,8 @@ obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o obj-$(CONFIG_MFD_STMFX) += stmfx.o obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o +obj-$(CONFIG_MFD_SY7636A) += sy7636a.o + obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c new file mode 100644 index 000000000000..39aac965d854 --- /dev/null +++ b/drivers/mfd/sy7636a.c @@ -0,0 +1,252 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * MFD driver for SY7636A chip + * + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ + * + * Author: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Based on the lp87565 driver by Keerthy <j-keerthy@ti.com> + */ + +#include <linux/interrupt.h> +#include <linux/mfd/core.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/regmap.h> +#include <linux/sysfs.h> + +#include <linux/mfd/sy7636a.h> + +static const struct regmap_config sy7636a_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static const struct mfd_cell sy7636a_cells[] = { + { .name = "sy7636a-regulator", }, + { .name = "sy7636a-temperature", }, + { .name = "sy7636a-thermal", }, +}; + +static const struct of_device_id of_sy7636a_match_table[] = { + { .compatible = "silergy,sy7636a", }, + {} +}; +MODULE_DEVICE_TABLE(of, of_sy7636a_match_table); + +static const char * const states[] = { + "no fault event", + "UVP at VP rail", + "UVP at VN rail", + "UVP at VPOS rail", + "UVP at VNEG rail", + "UVP at VDDH rail", + "UVP at VEE rail", + "SCP at VP rail", + "SCP at VN rail", + "SCP at VPOS rail", + "SCP at VNEG rail", + "SCP at VDDH rail", + "SCP at VEE rail", + "SCP at V COM rail", + "UVLO", + "Thermal shutdown", +}; + +int get_vcom_voltage_mv(struct regmap *regmap) +{ + int ret; + unsigned int val, val_h; + + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); + if (ret) + return ret; + + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); + if (ret) + return ret; + + val |= (val_h << 8); + + return (val & 0x1FF) * 10; +} + +int set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom) +{ + int ret; + unsigned int val; + + if (vcom < 0 || vcom > 5000) + return -EINVAL; + + val = (unsigned int)(vcom / 10) & 0x1ff; + + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, val); + if (ret) + return ret; + + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, val >> 8); + if (ret) + return ret; + + return 0; +} + +static ssize_t state_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int ret; + unsigned int val; + struct sy7636a *sy7636a = dev_get_drvdata(dev); + + ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val); + if (ret) { + dev_err(sy7636a->dev, "Failed to read from device\n"); + return ret; + } + + val = val >> 1; + + if (val >= ARRAY_SIZE(states)) { + dev_err(sy7636a->dev, "Unexpected value read from device: %u\n", val); + return -EINVAL; + } + + return snprintf(buf, PAGE_SIZE, "%s\n", states[val]); +} +static DEVICE_ATTR(state, 0444, state_show, NULL); + +static ssize_t power_good_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int ret; + unsigned int val; + struct sy7636a *sy7636a = dev_get_drvdata(dev); + + ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val); + if (ret) { + dev_err(sy7636a->dev, "Failed to read from device\n"); + return ret; + } + + val &= 0x01; + + return snprintf(buf, PAGE_SIZE, "%s\n", val ? "ON" : "OFF"); +} +static DEVICE_ATTR(power_good, 0444, power_good_show, NULL); + +static ssize_t vcom_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int ret; + struct sy7636a *sy7636a = dev_get_drvdata(dev); + + ret = get_vcom_voltage_mv(sy7636a->regmap); + if (ret < 0) + return ret; + + return snprintf(buf, PAGE_SIZE, "%d\n", -ret); +} + +static ssize_t vcom_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int ret; + int vcom; + struct sy7636a *sy7636a = dev_get_drvdata(dev); + + ret = kstrtoint(buf, 0, &vcom); + if (ret) + return ret; + + if (vcom > 0 || vcom < -5000) + return -EINVAL; + + ret = set_vcom_voltage_mv(sy7636a->regmap, (unsigned int)(-vcom)); + if (ret) + return ret; + + return count; +} +static DEVICE_ATTR(vcom, 0644, vcom_show, vcom_store); + +static struct attribute *sy7636a_sysfs_attrs[] = { + &dev_attr_state.attr, + &dev_attr_power_good.attr, + &dev_attr_vcom.attr, + NULL, +}; + +static const struct attribute_group sy7636a_sysfs_attr_group = { + .attrs = sy7636a_sysfs_attrs, +}; + +static int sy7636a_probe(struct i2c_client *client, + const struct i2c_device_id *ids) +{ + struct sy7636a *sy7636a; + int ret; + + sy7636a = devm_kzalloc(&client->dev, sizeof(struct sy7636a), GFP_KERNEL); + if (sy7636a == NULL) + return -ENOMEM; + + sy7636a->dev = &client->dev; + + sy7636a->regmap = devm_regmap_init_i2c(client, &sy7636a_regmap_config); + if (IS_ERR(sy7636a->regmap)) { + ret = PTR_ERR(sy7636a->regmap); + dev_err(sy7636a->dev, + "Failed to initialize register map: %d\n", ret); + return ret; + } + + i2c_set_clientdata(client, sy7636a); + + ret = sysfs_create_group(&client->dev.kobj, &sy7636a_sysfs_attr_group); + if (ret) { + dev_err(sy7636a->dev, "Failed to create sysfs attributes\n"); + return ret; + } + + ret = devm_mfd_add_devices(sy7636a->dev, PLATFORM_DEVID_AUTO, + sy7636a_cells, ARRAY_SIZE(sy7636a_cells), + NULL, 0, NULL); + if (ret) { + dev_err(sy7636a->dev, "Failed to add mfd devices\n"); + sysfs_remove_group(&client->dev.kobj, &sy7636a_sysfs_attr_group); + return ret; + } + + return 0; +} + +static const struct i2c_device_id sy7636a_id_table[] = { + { "sy7636a", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, sy7636a_id_table); + +static struct i2c_driver sy7636a_driver = { + .driver = { + .name = "sy7636a", + .of_match_table = of_sy7636a_match_table, + }, + .probe = sy7636a_probe, + .id_table = sy7636a_id_table, +}; +module_i2c_driver(sy7636a_driver); + +MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>"); +MODULE_DESCRIPTION("Silergy SY7636A Multi-Function Device Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/sy7636a.h b/include/linux/mfd/sy7636a.h new file mode 100644 index 000000000000..642789c4d0a9 --- /dev/null +++ b/include/linux/mfd/sy7636a.h @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Functions to access SY3686A power management chip. + * + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __LINUX_MFD_SY7636A_H +#define __LINUX_MFD_SY7636A_H + +#include <linux/i2c.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regmap.h> + +#define SY7636A_REG_OPERATION_MODE_CRL 0x00 +#define SY7636A_OPERATION_MODE_CRL_VCOMCTL (1 << 6) +#define SY7636A_OPERATION_MODE_CRL_ONOFF (1 << 7) +#define SY7636A_REG_VCOM_ADJUST_CTRL_L 0x01 +#define SY7636A_REG_VCOM_ADJUST_CTRL_H 0x02 +#define SY7636A_REG_VCOM_ADJUST_CTRL_MASK 0x01ff +#define SY7636A_REG_VLDO_VOLTAGE_ADJULST_CTRL 0x03 +#define SY7636A_REG_POWER_ON_DELAY_TIME 0x06 +#define SY7636A_REG_FAULT_FLAG 0x07 +#define SY7636A_FAULT_FLAG_PG (1 << 0) +#define SY7636A_REG_TERMISTOR_READOUT 0x08 + +#define SY7636A_REG_MAX 0x08 + +struct sy7636a { + struct device *dev; + struct regmap *regmap; + unsigned int vcom; + struct gpio_desc *pgood_gpio; + struct mutex reglock; +}; + +int get_vcom_voltage_mv(struct regmap *regmap); +int set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom); + +#endif /* __LINUX_MFD_SY7636A_H */
Initial support for the Silergy SY7636A Power Management chip driver. Signed-off-by: Alistair Francis <alistair@alistair23.me> --- drivers/mfd/Kconfig | 10 ++ drivers/mfd/Makefile | 2 + drivers/mfd/sy7636a.c | 252 ++++++++++++++++++++++++++++++++++++ include/linux/mfd/sy7636a.h | 50 +++++++ 4 files changed, 314 insertions(+) create mode 100644 drivers/mfd/sy7636a.c create mode 100644 include/linux/mfd/sy7636a.h