mfd: simple-mfd-i2c: Add configuration for RPi POE HAT

The Raspbery Pi PoE+ HAT exposes a fan controller and power
supply status reporting via a single I2C address.

Create an MFD device that allows loading of the relevant
sub-drivers, with a shared I2C regmap.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ecd9ba2..24e864c 100644 (file)
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1170,6 +1170,16 @@ config MFD_SY7636A
          To enable support for building sub-devices as modules,
          choose M here.
 
+config MFD_RASPBERRYPI_POE_HAT
+       tristate "Raspberry Pi PoE HAT MFD"
+       depends on I2C
+       select MFD_SIMPLE_MFD_I2C
+       help
+         This module supports the PWM fan controller found on the Raspberry Pi
+         POE and POE+ HAT boards, and the power supply driver on the POE+ HAT.
+         (Functionally it relies on MFD_SIMPLE_MFD_I2C to provide the framework
+         that loads the child drivers).
+
 config MFD_RDC321X
        tristate "RDC R-321x southbridge"
        select MFD_CORE

diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
index 6eda795..7b98ee2 100644 (file)
--- a/drivers/mfd/simple-mfd-i2c.c
+++ b/drivers/mfd/simple-mfd-i2c.c
@@ -29,6 +29,15 @@ static const struct regmap_config regmap_config_8r_8v = {
        .val_bits = 8,
 };
 
+static const struct regmap_config regmap_config_16r_8v = {
+       .reg_bits = 16,
+       .val_bits = 8,
+};
+
+static const struct simple_mfd_data rpi_poe_core = {
+       .regmap_config = &regmap_config_16r_8v,
+};
+
 static int simple_mfd_i2c_probe(struct i2c_client *i2c)
 {
        const struct simple_mfd_data *simple_mfd_data;
@@ -88,6 +97,7 @@ static const struct of_device_id simple_mfd_i2c_of_match[] = {
        { .compatible = "silergy,sy7636a", .data = &silergy_sy7636a},
        { .compatible = "maxim,max5970", .data = &maxim_max5970},
        { .compatible = "maxim,max5978", .data = &maxim_max5970},
+       { .compatible = "raspberrypi,poe-core", &rpi_poe_core },
        {}
 };
 MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);