From d310cdbb4ee6285f374d4dfc32173c35f8a2273e Mon Sep 17 00:00:00 2001 From: Artur Weber Date: Thu, 15 May 2025 16:16:31 +0200 Subject: [PATCH] mfd: bcm590xx: Add PMU ID/revision parsing function The BCM590xx PMUs have two I2C registers for reading the PMU ID and revision. The revision is useful for subdevice drivers, since different revisions may have slight differences in behavior (for example - BCM59054 has different regulator configurations for revision A0 and A1). Check the PMU ID register and make sure it matches the DT compatible. Fetch the digital and analog revision from the PMUREV register so that it can be used in subdevice drivers. Also add some known revision values to bcm590xx.h, for convenience when writing subdevice drivers. Signed-off-by: Artur Weber Reviewed-by: Stanislav Jakubek Link: https://lore.kernel.org/r/20250515-bcm59054-v9-4-14ba0ea2ea5b@gmail.com Signed-off-by: Lee Jones --- drivers/mfd/bcm590xx.c | 54 ++++++++++++++++++++++++++++++++++++ include/linux/mfd/bcm590xx.h | 14 ++++++++++ 2 files changed, 68 insertions(+) diff --git a/drivers/mfd/bcm590xx.c b/drivers/mfd/bcm590xx.c index 4620eed0066f..5a8456bbd63f 100644 --- a/drivers/mfd/bcm590xx.c +++ b/drivers/mfd/bcm590xx.c @@ -17,6 +17,15 @@ #include #include +/* Under primary I2C address: */ +#define BCM590XX_REG_PMUID 0x1e + +#define BCM590XX_REG_PMUREV 0x1f +#define BCM590XX_PMUREV_DIG_MASK 0xF +#define BCM590XX_PMUREV_DIG_SHIFT 0 +#define BCM590XX_PMUREV_ANA_MASK 0xF0 +#define BCM590XX_PMUREV_ANA_SHIFT 4 + static const struct mfd_cell bcm590xx_devs[] = { { .name = "bcm590xx-vregs", @@ -37,6 +46,47 @@ static const struct regmap_config bcm590xx_regmap_config_sec = { .cache_type = REGCACHE_MAPLE, }; +/* Map PMU ID value to model name string */ +static const char * const bcm590xx_names[] = { + [BCM590XX_PMUID_BCM59054] = "BCM59054", + [BCM590XX_PMUID_BCM59056] = "BCM59056", +}; + +static int bcm590xx_parse_version(struct bcm590xx *bcm590xx) +{ + unsigned int id, rev; + int ret; + + /* Get PMU ID and verify that it matches compatible */ + ret = regmap_read(bcm590xx->regmap_pri, BCM590XX_REG_PMUID, &id); + if (ret) { + dev_err(bcm590xx->dev, "failed to read PMU ID: %d\n", ret); + return ret; + } + + if (id != bcm590xx->pmu_id) { + dev_err(bcm590xx->dev, "Incorrect ID for %s: expected %x, got %x.\n", + bcm590xx_names[bcm590xx->pmu_id], bcm590xx->pmu_id, id); + return -ENODEV; + } + + /* Get PMU revision and store it in the info struct */ + ret = regmap_read(bcm590xx->regmap_pri, BCM590XX_REG_PMUREV, &rev); + if (ret) { + dev_err(bcm590xx->dev, "failed to read PMU revision: %d\n", ret); + return ret; + } + + bcm590xx->rev_digital = (rev & BCM590XX_PMUREV_DIG_MASK) >> BCM590XX_PMUREV_DIG_SHIFT; + + bcm590xx->rev_analog = (rev & BCM590XX_PMUREV_ANA_MASK) >> BCM590XX_PMUREV_ANA_SHIFT; + + dev_dbg(bcm590xx->dev, "PMU ID 0x%x (%s), revision: digital %d, analog %d", + id, bcm590xx_names[id], bcm590xx->rev_digital, bcm590xx->rev_analog); + + return 0; +} + static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri) { struct bcm590xx *bcm590xx; @@ -78,6 +128,10 @@ static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri) goto err; } + ret = bcm590xx_parse_version(bcm590xx); + if (ret) + goto err; + ret = devm_mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs, ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL); if (ret < 0) { diff --git a/include/linux/mfd/bcm590xx.h b/include/linux/mfd/bcm590xx.h index 76c30e629333..a54c50b2d2c8 100644 --- a/include/linux/mfd/bcm590xx.h +++ b/include/linux/mfd/bcm590xx.h @@ -17,6 +17,16 @@ #define BCM590XX_PMUID_BCM59054 0x54 #define BCM590XX_PMUID_BCM59056 0x56 +/* Known chip revision IDs */ +#define BCM59054_REV_DIGITAL_A1 1 +#define BCM59054_REV_ANALOG_A1 2 + +#define BCM59056_REV_DIGITAL_A0 1 +#define BCM59056_REV_ANALOG_A0 1 + +#define BCM59056_REV_DIGITAL_B0 2 +#define BCM59056_REV_ANALOG_B0 2 + /* max register address */ #define BCM590XX_MAX_REGISTER_PRI 0xe7 #define BCM590XX_MAX_REGISTER_SEC 0xf0 @@ -31,6 +41,10 @@ struct bcm590xx { /* PMU ID value; also used as device type */ u8 pmu_id; + + /* Chip revision, read from PMUREV reg */ + u8 rev_digital; + u8 rev_analog; }; #endif /* __LINUX_MFD_BCM590XX_H */ -- 2.50.1