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

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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>
This commit is contained in:
Dave Stevenson
2022-01-19 17:22:57 +00:00
committed by Dom Cobley
parent b71c538db7
commit 3c5d8300a7
2 changed files with 20 additions and 0 deletions
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10
drivers/mfd/Kconfig
View File

@@ -1263,6 +1263,16 @@ config MFD_SY7636A
To enable support for building sub-devices as modules, To enable support for building sub-devices as modules,
choose M here. 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 config MFD_RDC321X
tristate "RDC R-321x southbridge" tristate "RDC R-321x southbridge"
select MFD_CORE select MFD_CORE

10
drivers/mfd/simple-mfd-i2c.c
View File

@@ -29,6 +29,15 @@ static const struct regmap_config regmap_config_8r_8v = {
.val_bits = 8, .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) static int simple_mfd_i2c_probe(struct i2c_client *i2c)
{ {
const struct simple_mfd_data *simple_mfd_data; const struct simple_mfd_data *simple_mfd_data;
@@ -101,6 +110,7 @@ static const struct of_device_id simple_mfd_i2c_of_match[] = {
{ .compatible = "maxim,max77705-battery", .data = &maxim_mon_max77705}, { .compatible = "maxim,max77705-battery", .data = &maxim_mon_max77705},
{ .compatible = "fsl,lx2160aqds-fpga" }, { .compatible = "fsl,lx2160aqds-fpga" },
{ .compatible = "fsl,ls1028aqds-fpga" }, { .compatible = "fsl,ls1028aqds-fpga" },
{ .compatible = "raspberrypi,poe-core", &rpi_poe_core },
{ .compatible = "raspberrypi,sensehat" }, { .compatible = "raspberrypi,sensehat" },
{} {}
}; };