@@ -77,6 +77,18 @@ config MFD_AS3711
help
Support for the AS3711 PMIC from AMS
+config MFD_SMPRO
+ tristate "Ampere Computing MFD SMpro core driver"
+ depends on I2C
+ select MFD_CORE
+ select REGMAP_I2C
+ help
+ Say yes here to enable SMpro driver support for Ampere's Altra
+ processor family.
+
+ Ampere's Altra SMpro exposes an I2C regmap interface that can
+ be accessed by child devices.
+
config MFD_AS3722
tristate "ams AS3722 Power Management IC"
select MFD_CORE
@@ -268,6 +268,7 @@ obj-$(CONFIG_MFD_QCOM_PM8008) += qcom-pm8008.o
obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o
obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o
+obj-$(CONFIG_MFD_SMPRO) += smpro-mfd.o
obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o
obj-$(CONFIG_MFD_ATC260X) += atc260x-core.o
new file mode 100644
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Ampere Altra Family SMPro MFD - I2C
+ *
+ * Copyright (c) 2021, Ampere Computing LLC
+ *
+ * Author: Quan Nguyen <quan@os.amperecomputing..com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/mfd/core.h>
+#include <linux/regmap.h>
+
+/* Identification Registers */
+#define MANUFACTURER_ID_REG 0x02
+#define AMPERE_MANUFACTURER_ID 0xCD3A
+
+static const struct regmap_config simple_word_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+};
+
+static const struct mfd_cell smpro_devs[] = {
+ MFD_CELL_NAME("smpro-hwmon"),
+};
+
+static int smpro_mfd_probe(struct i2c_client *i2c)
+{
+ const struct regmap_config *config;
+ struct regmap *regmap;
+ unsigned int val;
+ int ret;
+
+ config = device_get_match_data(&i2c->dev);
+ if (!config)
+ config = &simple_word_regmap_config;
+
+ regmap = devm_regmap_init_i2c(i2c, config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ /* Check for valid ID */
+ ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val);
+ if (ret)
+ return ret;
+
+ if (val != AMPERE_MANUFACTURER_ID)
+ return -ENODEV;
+
+ return devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
+ smpro_devs, ARRAY_SIZE(smpro_devs), NULL, 0, NULL);
+}
+
+static const struct of_device_id smpro_mfd_of_match[] = {
+ { .compatible = "ampere,smpro", .data = &simple_word_regmap_config },
+ {}
+};
+MODULE_DEVICE_TABLE(of, smpro_mfd_of_match);
+
+static struct i2c_driver smpro_mfd_driver = {
+ .probe_new = smpro_mfd_probe,
+ .driver = {
+ .name = "smpro-mfd-i2c",
+ .of_match_table = smpro_mfd_of_match,
+ },
+};
+module_i2c_driver(smpro_mfd_driver);
+
+MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
+MODULE_DESCRIPTION("SMPRO MFD - I2C driver");
+MODULE_LICENSE("GPL v2");
Adds Multi-function devices driver for SMpro co-processor found on the Mt.Jade hardware reference platform with Ampere's Altra processor family. Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com> --- Changes in v5: + Dropped the use of simple-mfd-i2c driver [Quan] + Introduced drivers/mfd/smpro-mfd.c driver to instantiate sub-devices. This is to avoid DT nodes without resource issue [Quan] + Revised commit message [Quan] Changes in v4: + Add "depends on I2C" to fix build issue found by kernel test robot [Guenter] Changes in v3: + None Changes in v2: + Used 'struct of_device_id's .data attribute [Lee Jones] drivers/mfd/Kconfig | 12 +++++++ drivers/mfd/Makefile | 1 + drivers/mfd/smpro-mfd.c | 74 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 87 insertions(+) create mode 100644 drivers/mfd/smpro-mfd.c