* [PATCH v2] mfd: regulator: initial support for pca9450
@ 2023-09-29 8:57 Holger Assmann
2023-10-04 8:23 ` Sascha Hauer
0 siblings, 1 reply; 2+ messages in thread
From: Holger Assmann @ 2023-09-29 8:57 UTC (permalink / raw)
To: barebox; +Cc: Holger Assmann
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 <h.assmann@pengutronix.de>
---
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
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH v2] mfd: regulator: initial support for pca9450
2023-09-29 8:57 [PATCH v2] mfd: regulator: initial support for pca9450 Holger Assmann
@ 2023-10-04 8:23 ` Sascha Hauer
0 siblings, 0 replies; 2+ messages in thread
From: Sascha Hauer @ 2023-10-04 8:23 UTC (permalink / raw)
To: Holger Assmann; +Cc: barebox
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 <h.assmann@pengutronix.de>
> ---
>
> 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 |
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