gpio: lp87565: Add support for GPIO

Add driver for lp87565 PMIC family GPIOs. Three GPIOs are supported
and can be configured in Open-drain output or Push-pull output.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ee0bb47bf02e5dd5e84949f1d09ed61119403452..a7a10562498ecf1aac5636cd7928b1bbdc88eda8 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -954,6 +954,16 @@ config GPIO_LP873X
          This driver can also be built as a module. If so, the module will be
           called gpio-lp873x.
 
+config GPIO_LP87565
+       tristate "TI LP87565 GPIO"
+       depends on MFD_TI_LP87565
+       help
+         This driver supports the GPIO on TI Lp873565 PMICs. 3 GPIOs are present
+         on LP87565 PMICs.
+
+         This driver can also be built as a module. If so, the module will be
+         called gpio-lp87565.
+
 config GPIO_MAX77620
        tristate "GPIO support for PMIC MAX77620 and MAX20024"
        depends on MFD_MAX77620

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 43a326be2e57a3bca945523a7ff11f8e96c6f941..3de054e1d8b4ac7e1559f9203230e01eb15bb328 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -66,6 +66,7 @@ obj-$(CONFIG_GPIO_LP3943)     += gpio-lp3943.o
 obj-$(CONFIG_GPIO_LPC18XX)     += gpio-lpc18xx.o
 obj-$(CONFIG_ARCH_LPC32XX)     += gpio-lpc32xx.o
 obj-$(CONFIG_GPIO_LP873X)      += gpio-lp873x.o
+obj-$(CONFIG_GPIO_LP87565)     += gpio-lp87565.o
 obj-$(CONFIG_GPIO_LYNXPOINT)   += gpio-lynxpoint.o
 obj-$(CONFIG_GPIO_MAX730X)     += gpio-max730x.o
 obj-$(CONFIG_GPIO_MAX7300)     += gpio-max7300.o

diff --git a/drivers/gpio/gpio-lp87565.c b/drivers/gpio/gpio-lp87565.c
new file mode 100644 (file)
index 0000000..6313c50
--- /dev/null
+++ b/drivers/gpio/gpio-lp87565.c
@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ *     Keerthy <j-keerthy@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether expressed or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License version 2 for more details.
+ *
+ * Based on the LP873X driver
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/lp87565.h>
+
+struct lp87565_gpio {
+       struct gpio_chip chip;
+       struct regmap *map;
+};
+
+static int lp87565_gpio_get_direction(struct gpio_chip *chip,
+                                     unsigned int offset)
+{
+       struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+       int ret, val;
+
+       ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
+       if (ret < 0)
+               return ret;
+
+       return !(val & BIT(offset));
+}
+
+static int lp87565_gpio_direction_input(struct gpio_chip *chip,
+                                       unsigned int offset)
+{
+       struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+
+       return regmap_update_bits(gpio->map,
+                                 LP87565_REG_GPIO_CONFIG,
+                                 BIT(offset), 0);
+}
+
+static int lp87565_gpio_direction_output(struct gpio_chip *chip,
+                                        unsigned int offset, int value)
+{
+       struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+
+       return regmap_update_bits(gpio->map,
+                                 LP87565_REG_GPIO_CONFIG,
+                                 BIT(offset), !value ? BIT(offset) : 0);
+}
+
+static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+       struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+       int ret, val;
+
+       ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
+       if (ret < 0)
+               return ret;
+
+       return !!(val & BIT(offset));
+}
+
+static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
+                            int value)
+{
+       struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+
+       regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
+                          BIT(offset), value ? BIT(offset) : 0);
+}
+
+static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
+{
+       struct lp87565_gpio *gpio = gpiochip_get_data(gc);
+       int ret;
+
+       switch (offset) {
+       case 0:
+       case 1:
+       case 2:
+               /*
+                * MUX can program the pin to be in EN1/2/3 pin mode
+                * Or GPIO1/2/3 mode.
+                * Setup the GPIO*_SEL MUX to GPIO mode
+                */
+               ret = regmap_update_bits(gpio->map,
+                                        LP87565_REG_PIN_FUNCTION,
+                                        BIT(offset), BIT(offset));
+               if (ret)
+                       return ret;
+
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
+static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
+                                  unsigned long config)
+{
+       struct lp87565_gpio *gpio = gpiochip_get_data(gc);
+
+       switch (pinconf_to_config_param(config)) {
+       case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+               return regmap_update_bits(gpio->map,
+                                         LP87565_REG_GPIO_CONFIG,
+                                         BIT(offset +
+                                             __ffs(LP87565_GOIO1_OD)),
+                                         BIT(offset +
+                                             __ffs(LP87565_GOIO1_OD)));
+       case PIN_CONFIG_DRIVE_PUSH_PULL:
+               return regmap_update_bits(gpio->map,
+                                         LP87565_REG_GPIO_CONFIG,
+                                         BIT(offset +
+                                             __ffs(LP87565_GOIO1_OD)), 0);
+       default:
+               return -ENOTSUPP;
+       }
+}
+
+static const struct gpio_chip template_chip = {
+       .label                  = "lp87565-gpio",
+       .owner                  = THIS_MODULE,
+       .request                = lp87565_gpio_request,
+       .get_direction          = lp87565_gpio_get_direction,
+       .direction_input        = lp87565_gpio_direction_input,
+       .direction_output       = lp87565_gpio_direction_output,
+       .get                    = lp87565_gpio_get,
+       .set                    = lp87565_gpio_set,
+       .set_config             = lp87565_gpio_set_config,
+       .base                   = -1,
+       .ngpio                  = 3,
+       .can_sleep              = true,
+};
+
+static int lp87565_gpio_probe(struct platform_device *pdev)
+{
+       struct lp87565_gpio *gpio;
+       struct lp87565 *lp87565;
+       int ret;
+
+       gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+       if (!gpio)
+               return -ENOMEM;
+
+       lp87565 = dev_get_drvdata(pdev->dev.parent);
+       gpio->chip = template_chip;
+       gpio->chip.parent = lp87565->dev;
+       gpio->map = lp87565->regmap;
+
+       ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static const struct platform_device_id lp87565_gpio_id_table[] = {
+       { "lp87565-q1-gpio", },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
+
+static struct platform_driver lp87565_gpio_driver = {
+       .driver = {
+               .name = "lp87565-gpio",
+       },
+       .probe = lp87565_gpio_probe,
+       .id_table = lp87565_gpio_id_table,
+};
+module_platform_driver(lp87565_gpio_driver);
+
+MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
+MODULE_DESCRIPTION("LP87565 GPIO driver");
+MODULE_LICENSE("GPL v2");