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

This reverts commit f57048a.

Author: popcornmix

drivers/mfd/Kconfig

@@ -1210,6 +1210,16 @@ 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

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;
@@ -117,6 +126,7 @@ static const struct of_device_id simple_mfd_i2c_of_match[] = {
 	{ .compatible = "maxim,max5970", .data = &maxim_max5970},
 	{ .compatible = "maxim,max5978", .data = &maxim_max5970},
 	{ .compatible = "maxim,max77705-battery", .data = &maxim_mon_max77705},
+	{ .compatible = "raspberrypi,poe-core", &rpi_poe_core },
 	{ .compatible = "raspberrypi,sensehat" },
 	{ .compatible = "silergy,sy7636a", .data = &silergy_sy7636a},
 	{ .compatible = "spacemit,p1", .data = &spacemit_p1, },