[PATCH 2/4] mfd: simple-mfd-i2c: Adds Ampere's Altra SMpro support

Quan Nguyen
2021-02-25T10:26:57Z

Adds an MFD driver for SMpro found on the Mt.Jade hardware reference
platform with Ampere's Altra processor family.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
---
drivers/mfd/Kconfig | 10 ++++++++++
drivers/mfd/simple-mfd-i2c.c | 15 +++++++++++++--
2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b74efa469e90..5414371bdea1 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -77,6 +77,16 @@ config MFD_AS3711
help
Support for the AS3711 PMIC from AMS

+config MFD_SMPRO
+ tristate "Ampere Computing MFD SMpro core driver"
+ select MFD_SIMPLE_MFD_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
diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
index 87f684cff9a1..0459a9fbd3f5 100644
--- a/drivers/mfd/simple-mfd-i2c.c
+++ b/drivers/mfd/simple-mfd-i2c.c
@@ -21,14 +21,24 @@ static const struct regmap_config simple_regmap_config = {
.val_bits = 8,
};

+static const struct regmap_config simple_word_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+};
+
static int simple_mfd_i2c_probe(struct i2c_client *i2c)
{
const struct regmap_config *config;
struct regmap *regmap;

config = device_get_match_data(&i2c->dev);
- if (!config)
- config = &simple_regmap_config;
+ if (!config) {
+ if (of_device_is_compatible(i2c->dev.of_node,
+ "ampere,ac01-smpro"))
+ config = &simple_word_regmap_config;
+ else
+ config = &simple_regmap_config;
+ }

regmap = devm_regmap_init_i2c(i2c, config);
if (IS_ERR(regmap))
@@ -39,6 +49,7 @@ static int simple_mfd_i2c_probe(struct i2c_client *i2c)

static const struct of_device_id simple_mfd_i2c_of_match[] = {
{ .compatible = "kontron,sl28cpld" },
+ { .compatible = "ampere,ac01-smpro" },
{}
};
MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);
--
2.28.0