[v8,2/3] mfd: Add hi6421 PMIC core driver

This adds driver to support HiSilicon Hi6421 PMIC. Hi6421 includes multi-
functions, such as regulators, codec, ADCs, Coulomb counter, etc.
This driver includes core APIs _only_.

Drivers for individul components, like voltage regulators, are
implemented in corresponding driver directories and files.

Registers in Hi6421 are memory mapped, so using regmap-mmio API.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
---
 drivers/mfd/Kconfig             |  13 +++++
 drivers/mfd/Makefile            |   1 +
 drivers/mfd/hi6421-pmic-core.c  | 113 ++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/hi6421-pmic.h |  41 +++++++++++++++
 4 files changed, 168 insertions(+)
 create mode 100644 drivers/mfd/hi6421-pmic-core.c
 create mode 100644 include/linux/mfd/hi6421-pmic.h

On Mon, 01 Sep 2014, Guodong Xu wrote:

> This adds driver to support HiSilicon Hi6421 PMIC. Hi6421 includes multi-
> functions, such as regulators, codec, ADCs, Coulomb counter, etc.
> This driver includes core APIs _only_.
> 
> Drivers for individul components, like voltage regulators, are
> implemented in corresponding driver directories and files.
> 
> Registers in Hi6421 are memory mapped, so using regmap-mmio API.
> 
> Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
> ---
>  drivers/mfd/Kconfig             |  13 +++++
>  drivers/mfd/Makefile            |   1 +
>  drivers/mfd/hi6421-pmic-core.c  | 113 ++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/hi6421-pmic.h |  41 +++++++++++++++
>  4 files changed, 168 insertions(+)
>  create mode 100644 drivers/mfd/hi6421-pmic-core.c
>  create mode 100644 include/linux/mfd/hi6421-pmic.h

Applied, thanks.

> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index de5abf2..2de4919 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -210,6 +210,19 @@ config MFD_MC13XXX_I2C
>  	help
>  	  Select this if your MC13xxx is connected via an I2C bus.
>  
> +config MFD_HI6421_PMIC
> +	tristate "HiSilicon Hi6421 PMU/Codec IC"
> +	depends on OF
> +	select MFD_CORE
> +	select REGMAP_MMIO
> +	help
> +	  Add support for HiSilicon Hi6421 PMIC. Hi6421 includes multi-
> +	  functions, such as regulators, RTC, codec, Coulomb counter, etc.
> +	  This driver includes core APIs _only_. You have to select
> +	  individul components like voltage regulators under corresponding
> +	  menus in order to enable them.
> +	  We communicate with the Hi6421 via memory-mapped I/O.
> +
>  config HTC_EGPIO
>  	bool "HTC EGPIO support"
>  	depends on GPIOLIB && ARM
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index f001487..dc59efd 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711)	+= as3711.o
>  obj-$(CONFIG_MFD_AS3722)	+= as3722.o
>  obj-$(CONFIG_MFD_STW481X)	+= stw481x.o
>  obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
> +obj-$(CONFIG_MFD_HI6421_PMIC)	+= hi6421-pmic-core.o
>  
>  intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
> diff --git a/drivers/mfd/hi6421-pmic-core.c b/drivers/mfd/hi6421-pmic-core.c
> new file mode 100644
> index 0000000..321a265
> --- /dev/null
> +++ b/drivers/mfd/hi6421-pmic-core.c
> @@ -0,0 +1,113 @@
> +/*
> + * Device driver for Hi6421 IC
> + *
> + * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
> + *              http://www.hisilicon.com
> + * Copyright (c) <2013-2014> Linaro Ltd.
> + *              http://www.linaro.org
> + *
> + * Author: Guodong Xu <guodong.xu@linaro.org>
> + *
> + * 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; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/hi6421-pmic.h>
> +
> +static const struct mfd_cell hi6421_devs[] = {
> +	{ .name = "hi6421-regulator", },
> +};
> +
> +static struct regmap_config hi6421_regmap_config = {
> +	.reg_bits = 32,
> +	.reg_stride = 4,
> +	.val_bits = 8,
> +	.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
> +};
> +
> +static int hi6421_pmic_probe(struct platform_device *pdev)
> +{
> +	struct hi6421_pmic *pmic;
> +	struct resource *res;
> +	void __iomem *base;
> +	int ret;
> +
> +	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
> +	if (!pmic)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
> +						 &hi6421_regmap_config);
> +	if (IS_ERR(pmic->regmap)) {
> +		dev_err(&pdev->dev,
> +			"regmap init failed: %ld\n", PTR_ERR(pmic->regmap));
> +		return PTR_ERR(pmic->regmap);
> +	}
> +
> +	/* set over-current protection debounce 8ms */
> +	regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
> +				(HI6421_OCP_DEB_SEL_MASK
> +				 | HI6421_OCP_EN_DEBOUNCE_MASK
> +				 | HI6421_OCP_AUTO_STOP_MASK),
> +				(HI6421_OCP_DEB_SEL_8MS
> +				 | HI6421_OCP_EN_DEBOUNCE_ENABLE));
> +
> +	platform_set_drvdata(pdev, pmic);
> +
> +	ret = mfd_add_devices(&pdev->dev, 0, hi6421_devs,
> +			ARRAY_SIZE(hi6421_devs), NULL, 0, NULL);
> +	if (ret) {
> +		dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int hi6421_pmic_remove(struct platform_device *pdev)
> +{
> +	mfd_remove_devices(&pdev->dev);
> +
> +	return 0;
> +}
> +
> +static struct of_device_id of_hi6421_pmic_match_tbl[] = {
> +	{ .compatible = "hisilicon,hi6421-pmic", },
> +	{ },
> +};
> +
> +static struct platform_driver hi6421_pmic_driver = {
> +	.driver = {
> +		.name	= "hi6421_pmic",
> +		.of_match_table = of_hi6421_pmic_match_tbl,
> +	},
> +	.probe	= hi6421_pmic_probe,
> +	.remove	= hi6421_pmic_remove,
> +};
> +module_platform_driver(hi6421_pmic_driver);
> +
> +MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
> +MODULE_DESCRIPTION("Hi6421 PMIC driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mfd/hi6421-pmic.h b/include/linux/mfd/hi6421-pmic.h
> new file mode 100644
> index 0000000..587273e
> --- /dev/null
> +++ b/include/linux/mfd/hi6421-pmic.h
> @@ -0,0 +1,41 @@
> +/*
> + * Header file for device driver Hi6421 PMIC
> + *
> + * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
> + *              http://www.hisilicon.com
> + * Copyright (c) <2013-2014> Linaro Ltd.
> + *              http://www.linaro.org
> + *
> + * Author: Guodong Xu <guodong.xu@linaro.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef	__HI6421_PMIC_H
> +#define	__HI6421_PMIC_H
> +
> +/* Hi6421 registers are mapped to memory bus in 4 bytes stride */
> +#define HI6421_REG_TO_BUS_ADDR(x)	(x << 2)
> +
> +/* Hi6421 maximum register number */
> +#define HI6421_REG_MAX			0xFF
> +
> +/* Hi6421 OCP (over current protection) and DEB (debounce) control register */
> +#define	HI6421_OCP_DEB_CTRL_REG		HI6421_REG_TO_BUS_ADDR(0x51)
> +#define	HI6421_OCP_DEB_SEL_MASK		0x0C
> +#define HI6421_OCP_DEB_SEL_8MS		0x00
> +#define HI6421_OCP_DEB_SEL_16MS		0x04
> +#define HI6421_OCP_DEB_SEL_32MS		0x08
> +#define HI6421_OCP_DEB_SEL_64MS		0x0C
> +#define HI6421_OCP_EN_DEBOUNCE_MASK	0x02
> +#define HI6421_OCP_EN_DEBOUNCE_ENABLE	0x02
> +#define HI6421_OCP_AUTO_STOP_MASK	0x01
> +#define HI6421_OCP_AUTO_STOP_ENABLE	0x01
> +
> +struct hi6421_pmic {
> +	struct regmap		*regmap;
> +};
> +
> +#endif		/* __HI6421_PMIC_H */