[PATCH v14 03/10] pinctrl: Add MAX7360 pinctrl driver

Mathieu Dubois-Briand
2025-08-24T11:58:02Z

Add driver for Maxim Integrated MAX7360 pinctrl on the PORT pins. Pins
can be used either for GPIO, PWM or rotary encoder functionalities.

Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/pinctrl/Kconfig | 11 ++
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-max7360.c | 215 ++++++++++++++++++++++++++++++++++++++
3 files changed, 227 insertions(+)

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index ddd11668457c..57e4bdc8011d 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -358,6 +358,17 @@ config PINCTRL_LPC18XX
help
Pinctrl driver for NXP LPC18xx/43xx System Control Unit (SCU).

+config PINCTRL_MAX7360
+ tristate "MAX7360 Pincontrol support"
+ depends on MFD_MAX7360
+ select PINMUX
+ select GENERIC_PINCONF
+ help
+ Say Y here to enable pin control support for Maxim MAX7360 keypad
+ controller.
+ This keypad controller has 8 GPIO pins that may work as GPIO, or PWM,
+ or rotary encoder alternate modes.
+
config PINCTRL_MAX77620
tristate "MAX77620/MAX20024 Pincontrol support"
depends on MFD_MAX77620 && OF
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 909ab89a56d2..65aa432fc97e 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_PINCTRL_FALCON) += pinctrl-falcon.o
obj-$(CONFIG_PINCTRL_LOONGSON2) += pinctrl-loongson2.o
obj-$(CONFIG_PINCTRL_XWAY) += pinctrl-xway.o
obj-$(CONFIG_PINCTRL_LPC18XX) += pinctrl-lpc18xx.o
+obj-$(CONFIG_PINCTRL_MAX7360) += pinctrl-max7360.o
obj-$(CONFIG_PINCTRL_MAX77620) += pinctrl-max77620.o
obj-$(CONFIG_PINCTRL_MCP23S08_I2C) += pinctrl-mcp23s08_i2c.o
obj-$(CONFIG_PINCTRL_MCP23S08_SPI) += pinctrl-mcp23s08_spi.o
diff --git a/drivers/pinctrl/pinctrl-max7360.c b/drivers/pinctrl/pinctrl-max7360.c
new file mode 100644
index 000000000000..abfaff468bad
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-max7360.c
@@ -0,0 +1,215 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2025 Bootlin
+ *
+ * Author: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
+ */
+
+#include <linux/array_size.h>
+#include <linux/dev_printk.h>
+#include <linux/device.h>
+#include <linux/device/devres.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/mfd/max7360.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/stddef.h>
+
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinmux.h>
+
+#include "core.h"
+#include "pinmux.h"
+
+struct max7360_pinctrl {
+ struct pinctrl_dev *pctldev;
+ struct pinctrl_desc pinctrl_desc;
+};
+
+static const struct pinctrl_pin_desc max7360_pins[] = {
+ PINCTRL_PIN(0, "PORT0"),
+ PINCTRL_PIN(1, "PORT1"),
+ PINCTRL_PIN(2, "PORT2"),
+ PINCTRL_PIN(3, "PORT3"),
+ PINCTRL_PIN(4, "PORT4"),
+ PINCTRL_PIN(5, "PORT5"),
+ PINCTRL_PIN(6, "PORT6"),
+ PINCTRL_PIN(7, "PORT7"),
+};
+
+static const unsigned int port0_pins[] = {0};
+static const unsigned int port1_pins[] = {1};
+static const unsigned int port2_pins[] = {2};
+static const unsigned int port3_pins[] = {3};
+static const unsigned int port4_pins[] = {4};
+static const unsigned int port5_pins[] = {5};
+static const unsigned int port6_pins[] = {6};
+static const unsigned int port7_pins[] = {7};
+static const unsigned int rotary_pins[] = {6, 7};
+
+static const struct pingroup max7360_groups[] = {
+ PINCTRL_PINGROUP("PORT0", port0_pins, ARRAY_SIZE(port0_pins)),
+ PINCTRL_PINGROUP("PORT1", port1_pins, ARRAY_SIZE(port1_pins)),
+ PINCTRL_PINGROUP("PORT2", port2_pins, ARRAY_SIZE(port2_pins)),
+ PINCTRL_PINGROUP("PORT3", port3_pins, ARRAY_SIZE(port3_pins)),
+ PINCTRL_PINGROUP("PORT4", port4_pins, ARRAY_SIZE(port4_pins)),
+ PINCTRL_PINGROUP("PORT5", port5_pins, ARRAY_SIZE(port5_pins)),
+ PINCTRL_PINGROUP("PORT6", port6_pins, ARRAY_SIZE(port6_pins)),
+ PINCTRL_PINGROUP("PORT7", port7_pins, ARRAY_SIZE(port7_pins)),
+ PINCTRL_PINGROUP("ROTARY", rotary_pins, ARRAY_SIZE(rotary_pins)),
+};
+
+static int max7360_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ return ARRAY_SIZE(max7360_groups);
+}
+
+static const char *max7360_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int group)
+{
+ return max7360_groups[group].name;
+}
+
+static int max7360_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ const unsigned int **pins,
+ unsigned int *num_pins)
+{
+ *pins = max7360_groups[group].pins;
+ *num_pins = max7360_groups[group].npins;
+ return 0;
+}
+
+static const struct pinctrl_ops max7360_pinctrl_ops = {
+ .get_groups_count = max7360_pinctrl_get_groups_count,
+ .get_group_name = max7360_pinctrl_get_group_name,
+ .get_group_pins = max7360_pinctrl_get_group_pins,
+#ifdef CONFIG_OF
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+ .dt_free_map = pinconf_generic_dt_free_map,
+#endif
+};
+
+static const char * const simple_groups[] = {
+ "PORT0", "PORT1", "PORT2", "PORT3",
+ "PORT4", "PORT5", "PORT6", "PORT7",
+};
+
+static const char * const rotary_groups[] = { "ROTARY" };
+
+#define MAX7360_PINCTRL_FN_GPIO 0
+#define MAX7360_PINCTRL_FN_PWM 1
+#define MAX7360_PINCTRL_FN_ROTARY 2
+static const struct pinfunction max7360_functions[] = {
+ [MAX7360_PINCTRL_FN_GPIO] = PINCTRL_PINFUNCTION("gpio", simple_groups,
+ ARRAY_SIZE(simple_groups)),
+ [MAX7360_PINCTRL_FN_PWM] = PINCTRL_PINFUNCTION("pwm", simple_groups,
+ ARRAY_SIZE(simple_groups)),
+ [MAX7360_PINCTRL_FN_ROTARY] = PINCTRL_PINFUNCTION("rotary", rotary_groups,
+ ARRAY_SIZE(rotary_groups)),
+};
+
+static int max7360_get_functions_count(struct pinctrl_dev *pctldev)
+{
+ return ARRAY_SIZE(max7360_functions);
+}
+
+static const char *max7360_get_function_name(struct pinctrl_dev *pctldev, unsigned int selector)
+{
+ return max7360_functions[selector].name;
+}
+
+static int max7360_get_function_groups(struct pinctrl_dev *pctldev, unsigned int selector,
+ const char * const **groups,
+ unsigned int * const num_groups)
+{
+ *groups = max7360_functions[selector].groups;
+ *num_groups = max7360_functions[selector].ngroups;
+
+ return 0;
+}
+
+static int max7360_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
+ unsigned int group)
+{
+ struct regmap *regmap = dev_get_regmap(pctldev->dev->parent, NULL);
+ int val;
+
+ /*
+ * GPIO and PWM functions are the same: we only need to handle the
+ * rotary encoder function, on pins 6 and 7.
+ */
+ if (max7360_groups[group].pins[0] >= 6) {
+ if (selector == MAX7360_PINCTRL_FN_ROTARY)
+ val = MAX7360_GPIO_CFG_RTR_EN;
+ else
+ val = 0;
+
+ return regmap_write_bits(regmap, MAX7360_REG_GPIOCFG, MAX7360_GPIO_CFG_RTR_EN, val);
+ }
+
+ return 0;
+}
+
+static const struct pinmux_ops max7360_pmxops = {
+ .get_functions_count = max7360_get_functions_count,
+ .get_function_name = max7360_get_function_name,
+ .get_function_groups = max7360_get_function_groups,
+ .set_mux = max7360_set_mux,
+ .strict = true,
+};
+
+static int max7360_pinctrl_probe(struct platform_device *pdev)
+{
+ struct regmap *regmap;
+ struct pinctrl_desc *pd;
+ struct max7360_pinctrl *chip;
+ struct device *dev = &pdev->dev;
+
+ regmap = dev_get_regmap(dev->parent, NULL);
+ if (!regmap)
+ return dev_err_probe(dev, -ENODEV, "Could not get parent regmap\n");
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ pd = &chip->pinctrl_desc;
+
+ pd->pctlops = &max7360_pinctrl_ops;
+ pd->pmxops = &max7360_pmxops;
+ pd->name = dev_name(dev);
+ pd->pins = max7360_pins;
+ pd->npins = MAX7360_MAX_GPIO;
+ pd->owner = THIS_MODULE;
+
+ /*
+ * This MFD sub-device does not have any associated device tree node:
+ * properties are stored in the device node of the parent (MFD) device
+ * and this same node is used in phandles of client devices.
+ * Reuse this device tree node here, as otherwise the pinctrl subsystem
+ * would be confused by this topology.
+ */
+ device_set_of_node_from_dev(dev, dev->parent);
+
+ chip->pctldev = devm_pinctrl_register(dev, pd, chip);
+ if (IS_ERR(chip->pctldev))
+ return dev_err_probe(dev, PTR_ERR(chip->pctldev), "can't register controller\n");
+
+ return 0;
+}
+
+static struct platform_driver max7360_pinctrl_driver = {
+ .driver = {
+ .name = "max7360-pinctrl",
+ },
+ .probe = max7360_pinctrl_probe,
+};
+module_platform_driver(max7360_pinctrl_driver);
+
+MODULE_DESCRIPTION("MAX7360 pinctrl driver");
+MODULE_AUTHOR("Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>");
+MODULE_LICENSE("GPL");

--
2.39.5