[PATCH v4 4/4] gpio: gpio-tps6594x: add GPIO support for TPS6594x PMIC

[Matt Ranostay]

Add support for TPS6594X PMICs GPIO interface that has 11 that can be
configured as input or outputs.

Signed-off-by: Matt Ranostay <mranostay at ti.com>
---
 drivers/gpio/Kconfig         |  9 +++++
 drivers/gpio/Makefile        |  1 +
 drivers/gpio/gpio-tps6594x.c | 78 ++++++++++++++++++++++++++++++++++++
 include/linux/mfd/tps6594x.h |  4 ++
 4 files changed, 92 insertions(+)
 create mode 100644 drivers/gpio/gpio-tps6594x.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ec7cfd4f52b1..6b65c790efe7 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1405,6 +1405,15 @@ config GPIO_TPS65912
 	help
 	  This driver supports TPS65912 GPIO chip.
 
+config GPIO_TPS6594X
+	tristate "TI TPS6594X GPIO driver"
+	depends on MFD_TPS6594X || COMPILE_TEST
+	select REGMAP
+	select GPIO_REGMAP
+	help
+	  Select this option to enable GPIO driver for the TPS6954X
+	  PMIC chip family. There are 11 GPIOs that can be configured.
+
 config GPIO_TPS68470
 	tristate "TPS68470 GPIO"
 	depends on INTEL_SKL_INT3472
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 010587025fc8..9892f9adc5b5 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -159,6 +159,7 @@ obj-$(CONFIG_GPIO_TPS65218)		+= gpio-tps65218.o
 obj-$(CONFIG_GPIO_TPS6586X)		+= gpio-tps6586x.o
 obj-$(CONFIG_GPIO_TPS65910)		+= gpio-tps65910.o
 obj-$(CONFIG_GPIO_TPS65912)		+= gpio-tps65912.o
+obj-$(CONFIG_GPIO_TPS6594X)		+= gpio-tps6594x.o
 obj-$(CONFIG_GPIO_TPS68470)		+= gpio-tps68470.o
 obj-$(CONFIG_GPIO_TQMX86)		+= gpio-tqmx86.o
 obj-$(CONFIG_GPIO_TS4800)		+= gpio-ts4800.o
diff --git a/drivers/gpio/gpio-tps6594x.c b/drivers/gpio/gpio-tps6594x.c
new file mode 100644
index 000000000000..733fedba70cb
--- /dev/null
+++ b/drivers/gpio/gpio-tps6594x.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * GPIO driver for TI TPS6594x PMICs
+ *
+ * Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <linux/gpio/regmap.h>
+#include <linux/gpio/driver.h>
+#include <linux/mfd/tps6594x.h>
+
+#define GPIO_BANK_SIZE	8
+#define GPIO_CFG_MASK	BIT(0)
+
+static int tps6594x_regmap_xlate(struct gpio_regmap *gpio,
+				    unsigned int base, unsigned int offset,
+				    unsigned int *reg, unsigned int *mask)
+{
+	if (base == TPS6594X_GPIO_CONF) {
+		*reg = base + offset;
+		*mask = GPIO_CFG_MASK;
+	} else {
+		unsigned int line = offset % GPIO_BANK_SIZE;
+		unsigned int stride = offset / GPIO_BANK_SIZE;
+
+		*reg = base + stride;
+		*mask = BIT(line);
+	}
+
+	return 0;
+}
+
+static int tps6594x_gpio_probe(struct platform_device *pdev)
+{
+	struct gpio_regmap_config config = {0};
+	struct regmap *regmap;
+
+	regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!regmap)
+		return -ENODEV;
+
+	config.regmap = regmap;
+	config.parent = &pdev->dev;
+	config.ngpio = 11;
+	config.ngpio_per_reg = GPIO_BANK_SIZE;
+
+	config.reg_dat_base = TPS6594X_GPIO_IN;
+	config.reg_set_base = TPS6594X_GPIO_OUT;
+	config.reg_dir_out_base = TPS6594X_GPIO_CONF;
+	config.reg_mask_xlate = tps6594x_regmap_xlate;
+
+	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
+}
+
+static const struct of_device_id of_tps6594x_gpio_match[] = {
+	{ .compatible = "ti,tps6594-gpio", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, of_tps6594x_gpio_match);
+
+static struct platform_driver tps6594x_gpio_driver = {
+	.driver = {
+		.name = "tps6594-gpio",
+		.of_match_table = of_tps6594x_gpio_match,
+	},
+	.probe = tps6594x_gpio_probe,
+};
+module_platform_driver(tps6594x_gpio_driver);
+
+MODULE_ALIAS("platform:tps6594-gpio");
+MODULE_AUTHOR("Matt Ranostay <mranostay at ti.com>");
+MODULE_DESCRIPTION("TPS6594X GPIO driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/tps6594x.h b/include/linux/mfd/tps6594x.h
index 5a6af0da9223..155618e4d5d0 100644
--- a/include/linux/mfd/tps6594x.h
+++ b/include/linux/mfd/tps6594x.h
@@ -21,6 +21,10 @@
 #define TPS6594X_FSM_I2C_TRIGGERS		0x85
 #define TPS6594X_FSM_NSLEEP_TRIGGERS		0x86
 
+#define TPS6594X_GPIO_CONF			0x31
+#define TPS6594X_GPIO_OUT			0x3d
+#define TPS6594X_GPIO_IN			0x3f
+
 #define TPS6594X_RTC_SECONDS			0xb5
 #define TPS6594X_RTC_MINUTES			0xb6
 #define TPS6594X_RTC_HOURS			0xb7
-- 
2.38.GIT