diff options
Diffstat (limited to 'drivers/mfd/bcm590xx.c')
| -rw-r--r-- | drivers/mfd/bcm590xx.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/mfd/bcm590xx.c b/drivers/mfd/bcm590xx.c new file mode 100644 index 000000000000..5a8456bbd63f --- /dev/null +++ b/drivers/mfd/bcm590xx.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Broadcom BCM590xx PMU + * + * Copyright 2014 Linaro Limited + * Author: Matt Porter <mporter@linaro.org> + */ + +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/mfd/bcm590xx.h> +#include <linux/mfd/core.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/of.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +/* 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", + }, +}; + +static const struct regmap_config bcm590xx_regmap_config_pri = { + .reg_bits = 8, + .val_bits = 8, + .max_register = BCM590XX_MAX_REGISTER_PRI, + .cache_type = REGCACHE_MAPLE, +}; + +static const struct regmap_config bcm590xx_regmap_config_sec = { + .reg_bits = 8, + .val_bits = 8, + .max_register = BCM590XX_MAX_REGISTER_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; + int ret; + + bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL); + if (!bcm590xx) + return -ENOMEM; + + i2c_set_clientdata(i2c_pri, bcm590xx); + 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)) { + ret = PTR_ERR(bcm590xx->regmap_pri); + dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret); + return ret; + } + + /* Secondary I2C slave address is the base address with A(2) asserted */ + bcm590xx->i2c_sec = i2c_new_dummy_device(i2c_pri->adapter, + i2c_pri->addr | BIT(2)); + if (IS_ERR(bcm590xx->i2c_sec)) { + dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n"); + return PTR_ERR(bcm590xx->i2c_sec); + } + i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx); + + bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec, + &bcm590xx_regmap_config_sec); + if (IS_ERR(bcm590xx->regmap_sec)) { + ret = PTR_ERR(bcm590xx->regmap_sec); + dev_err(&bcm590xx->i2c_sec->dev, + "secondary regmap init failed: %d\n", ret); + 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) { + dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret); + goto err; + } + + return 0; + +err: + i2c_unregister_device(bcm590xx->i2c_sec); + return ret; +} + +static const struct of_device_id bcm590xx_of_match[] = { + { + .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" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id); + +static struct i2c_driver bcm590xx_i2c_driver = { + .driver = { + .name = "bcm590xx", + .of_match_table = bcm590xx_of_match, + }, + .probe = bcm590xx_i2c_probe, + .id_table = bcm590xx_i2c_id, +}; +module_i2c_driver(bcm590xx_i2c_driver); + +MODULE_AUTHOR("Matt Porter <mporter@linaro.org>"); +MODULE_DESCRIPTION("BCM590xx multi-function driver"); +MODULE_LICENSE("GPL v2"); |