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hwmon: (amc6821) add support for tsd,mule

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Theobroma Systems Mule is an MCU that emulates a set of I2C devices,
among which is an amc6821 and other devices that are reachable through
an I2C-mux.

The devices on the mux can be selected by writing the appropriate device
number to an I2C config register (amc6821: reg 0xff)

Implement "tsd,mule" compatible to instantiate the I2C-mux platform device
when probing the amc6821.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Farouk Bouabid <farouk.bouabid@cherry.de>
Message-ID: <20240906-dev-mule-i2c-mux-v8-4-dbd28a150e41@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Farouk Bouabid 2024-09-06 17:54:15 +02:00 committed by Guenter Roeck
parent 247a80fde1
commit 8f38236de6
1 changed files with 11 additions and 1 deletions
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12
drivers/hwmon/amc6821.c
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@ -22,6 +22,7 @@
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/slab.h>
@ -893,7 +894,6 @@ static bool amc6821_volatile_reg(struct device *dev, unsigned int reg)
static const struct regmap_config amc6821_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = AMC6821_REG_CONF3,
.volatile_reg = amc6821_volatile_reg,
.cache_type = REGCACHE_MAPLE,
};
@ -920,6 +920,13 @@ static int amc6821_probe(struct i2c_client *client)
if (err)
return err;
if (of_device_is_compatible(dev->of_node, "tsd,mule")) {
err = devm_of_platform_populate(dev);
if (err)
return dev_err_probe(dev, err,
"Failed to create sub-devices\n");
}
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
data, &amc6821_chip_info,
amc6821_groups);
@ -937,6 +944,9 @@ static const struct of_device_id __maybe_unused amc6821_of_match[] = {
{
.compatible = "ti,amc6821",
},
{
.compatible = "tsd,mule",
},
{ }
};