[PATCH v6 05/10] mfd: bcm590xx: Add support for multiple device types + BCM59054 compatible

Artur Weber
2025-03-04T06:20:56Z

The BCM59054 is another chip from the BCM590xx line of PMUs, commonly
used on devices with the BCM21664/BCM23550 chipsets.

Prepare the BCM590xx driver for supporting other devices by adding the
PMUID register values for supported chip types and store them in the
MFD data struct as "pmu_id". (These will be checked against the actual
PMUID register values in a later commit.)

Then, add a DT compatible for the BCM59054, and provide the PMU ID as
OF match data.

Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
---
Changes in v6:
- Move PMUID value to MFD header
- Use PMUID value as OF data/device type value
- Add bcm59054 to I2C ID table

Changes in v4:
- Rewrite commit message description
- Rename "device_type" member to "dev_type"
- Drop awkward line break to fit function call
- Add PMU ID/revision parsing function

Changes in v3:
- Fix compilation warning about device_type pointer cast type
- Name the device types enum and use it as the type in the MFD struct
---
drivers/mfd/bcm590xx.c | 12 +++++++++++-
include/linux/mfd/bcm590xx.h | 7 +++++++
2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/bcm590xx.c b/drivers/mfd/bcm590xx.c
index 8b56786d85d0182acf91da203b5f943556c08422..4620eed0066fbf1dd691a2e392e967747b4d125b 100644
--- a/drivers/mfd/bcm590xx.c
+++ b/drivers/mfd/bcm590xx.c
@@ -50,6 +50,8 @@ static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri)
bcm590xx->dev = &i2c_pri->dev;
bcm590xx->i2c_pri = i2c_pri;

+ bcm590xx->pmu_id = (uintptr_t) of_device_get_match_data(bcm590xx->dev);
+
bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri,
&bcm590xx_regmap_config_pri);
if (IS_ERR(bcm590xx->regmap_pri)) {
@@ -91,12 +93,20 @@ static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri)
}

static const struct of_device_id bcm590xx_of_match[] = {
- { .compatible = "brcm,bcm59056" },
+ {
+ .compatible = "brcm,bcm59054",
+ .data = (void *)BCM590XX_PMUID_BCM59054,
+ },
+ {
+ .compatible = "brcm,bcm59056",
+ .data = (void *)BCM590XX_PMUID_BCM59056,
+ },
{ }
};
MODULE_DEVICE_TABLE(of, bcm590xx_of_match);

static const struct i2c_device_id bcm590xx_i2c_id[] = {
+ { "bcm59054" },
{ "bcm59056" },
{ }
};
diff --git a/include/linux/mfd/bcm590xx.h b/include/linux/mfd/bcm590xx.h
index c614d1b1d8a217ac2f212908a4c19ae71fa56f63..8d146e3b102a7dbce6f4dbab9f8ae5a9c4e68c0e 100644
--- a/include/linux/mfd/bcm590xx.h
+++ b/include/linux/mfd/bcm590xx.h
@@ -13,6 +13,10 @@
#include <linux/i2c.h>
#include <linux/regmap.h>

+/* PMU ID register values; also used as device type */
+#define BCM590XX_PMUID_BCM59054 0x54
+#define BCM590XX_PMUID_BCM59056 0x56
+
/* max register address */
#define BCM590XX_MAX_REGISTER_PRI 0xe7
#define BCM590XX_MAX_REGISTER_SEC 0xf0
@@ -23,6 +27,9 @@ struct bcm590xx {
struct i2c_client *i2c_sec;
struct regmap *regmap_pri;
struct regmap *regmap_sec;
+
+ /* PMU ID value; also used as device type */
+ u8 pmu_id;
};

#endif /* __LINUX_MFD_BCM590XX_H */

--
2.48.1