On Fri, Sep 29, 2023 at 10:57:26AM +0200, Holger Assmann wrote:
> The PCA9450 PMIC by NXP can be communicated with via I2C; this driver uses
> that do determine the reset source that caused the PMIC to perform its
> latest power cycle.
>
> Signed-off-by: Holger Assmann <[email protected]>
> ---
>
> Changes v1 -> v2:
>
> 1. removed unnecessary whitespaces
> 2. code re-arrangement
>
> ---
> drivers/mfd/Kconfig | 7 +++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/pca9450.c | 107 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 115 insertions(+)
> create mode 100644 drivers/mfd/pca9450.c
Applied, thanks
Sascha
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 39a40c2a3f..5189364c2c 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -69,6 +69,13 @@ config MFD_STPMIC1
> help
> Select this to support communication with the STPMIC1.
>
> +config MFD_PCA9450
> + depends on I2C
> + select REGMAP_I2C
> + bool "PCA9450 MFD driver"
> + help
> + Select this to support communication with the PCA9450 PMIC.
> +
> config MFD_RN568PMIC
> depends on I2C
> select REGMAP_I2C
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index f19bf53655..00f3eacf3c 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -25,3 +25,4 @@ obj-$(CONFIG_MFD_RK808) += rk808.o
> obj-$(CONFIG_MFD_AXP20X_I2C) += axp20x-i2c.o axp20x.o
> obj-$(CONFIG_MFD_ATMEL_SMC) += atmel-smc.o
> obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o
> +obj-$(CONFIG_MFD_PCA9450) += pca9450.o
> diff --git a/drivers/mfd/pca9450.c b/drivers/mfd/pca9450.c
> new file mode 100644
> index 0000000000..929c4f68da
> --- /dev/null
> +++ b/drivers/mfd/pca9450.c
> @@ -0,0 +1,107 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2023 Holger Assmann, Pengutronix
> + */
> +
> +#include <common.h>
> +#include <driver.h>
> +#include <errno.h>
> +#include <i2c/i2c.h>
> +#include <init.h>
> +#include <mfd/pca9450.h>
> +#include <of.h>
> +#include <regmap.h>
> +#include <reset_source.h>
> +
> +#define REASON_PMIC_RST 0x10
> +#define REASON_SW_RST 0x20
> +#define REASON_WDOG 0x40
> +#define REASON_PWON 0x80
> +
> +static const struct regmap_config pca9450_regmap_i2c_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = 0x2E,
> +};
> +
> +static int pca9450_get_reset_source(struct device *dev, struct regmap *map)
> +{
> + enum reset_src_type type;
> + int reg;
> + int ret;
> +
> + ret = regmap_read(map, PCA9450_PWRON_STAT, ®);
> +
> + if (ret)
> + return ret;
> +
> + switch (reg) {
> + case REASON_PWON:
> + dev_dbg(dev, "Power ON triggered by PMIC_ON_REQ.\n");
> + type = RESET_POR;
> + break;
> + case REASON_WDOG:
> + dev_dbg(dev, "Detected cold reset by WDOGB pin\n");
> + type = RESET_WDG;
> + break;
> + case REASON_SW_RST:
> + dev_dbg(dev, "Detected cold reset by SW_RST\n");
> + type = RESET_RST;
> + break;
> + case REASON_PMIC_RST:
> + dev_dbg(dev, "Detected cold reset by PMIC_RST_B\n");
> + type = RESET_EXT;
> + break;
> + default:
> + dev_warn(dev, "Could not determine reset reason.\n");
> + type = RESET_UKWN;
> + }
> +
> + reset_source_set_device(dev, type);
> +
> + return 0;
> +};
> +
> +static int __init pca9450_probe(struct device *dev)
> +{
> + struct regmap *regmap;
> + int reg;
> + int ret;
> +
> + regmap = regmap_init_i2c(to_i2c_client(dev),
> &pca9450_regmap_i2c_config);
> + if (IS_ERR(regmap))
> + return PTR_ERR(regmap);
> +
> + ret = regmap_register_cdev(regmap, NULL);
> + if (ret)
> + return ret;
> +
> + ret = regmap_read(regmap, PCA9450_REG_DEV_ID, ®);
> +
> + if (ret) {
> + dev_err(dev, "Unable to read PMIC Chip ID\n");
> + return ret;
> + }
> +
> + /* Chip ID defined in bits [7:4] */
> + dev_info(dev, "PMIC Chip ID: 0x%x\n", (reg >> 4));
> +
> + pca9450_get_reset_source(dev,regmap);
> +
> + return of_platform_populate(dev->of_node, NULL, dev);
> +}
> +
> +static __maybe_unused struct of_device_id pca9450_dt_ids[] = {
> + { .compatible = "nxp,pca9450a" },
> + { .compatible = "nxp,pca9450c" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, pca9450_dt_ids);
> +
> +static struct driver pca9450_i2c_driver = {
> + .name = "pca9450-i2c",
> + .probe = pca9450_probe,
> + .of_compatible = DRV_OF_COMPAT(pca9450_dt_ids),
> +};
> +
> +coredevice_i2c_driver(pca9450_i2c_driver);
> --
> 2.39.2
>
>
>
--
Pengutronix e.K. | |
Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
