This adds support for the GPIOs on Cirrus Logic Madera class codecs. Any pins not used for special functions (see the pinctrl driver) can be used as general single-bit input or output lines. The number of available GPIOs varies between codecs.
Signed-off-by: Nariman Poushin nariman@opensource.wolfsonmicro.com Signed-off-by: Richard Fitzgerald rf@opensource.wolfsonmicro.com Signed-off-by: Charles Keepax ckeepax@opensource.wolfsonmicro.com --- Changes since V2: - Minor change now to use the parent MFD DT node for out DT bindings
MAINTAINERS | 1 + drivers/gpio/Kconfig | 6 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-madera.c | 196 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 204 insertions(+) create mode 100644 drivers/gpio/gpio-madera.c
diff --git a/MAINTAINERS b/MAINTAINERS index 0559a56..571255e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3318,6 +3318,7 @@ F: Documentation/devicetree/bindings/mfd/madera.txt F: Documentation/devicetree/bindings/pinctrl/cirrus,madera-pinctrl.txt F: include/linux/irqchip/irq-madera* F: include/linux/mfd/madera/* +F: drivers/gpio/gpio-madera* F: drivers/irqchip/irq-madera* F: drivers/mfd/madera* F: drivers/mfd/cs47l* diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 2e7d9ff..dd0d209 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -965,6 +965,12 @@ config GPIO_LP873X This driver can also be built as a module. If so, the module will be called gpio-lp873x.
+config GPIO_MADERA + bool "Cirrus Logic Madera class codecs" + depends on PINCTRL_MADERA + help + Support for GPIOs on Cirrus Logic Madera class codecs. + 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 bcd0a0b..89950d9 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -68,6 +68,7 @@ obj-$(CONFIG_GPIO_LPC18XX) += gpio-lpc18xx.o obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o obj-$(CONFIG_GPIO_LP873X) += gpio-lp873x.o obj-$(CONFIG_GPIO_LYNXPOINT) += gpio-lynxpoint.o +obj-$(CONFIG_GPIO_MADERA) += gpio-madera.o obj-$(CONFIG_GPIO_MAX730X) += gpio-max730x.o obj-$(CONFIG_GPIO_MAX7300) += gpio-max7300.o obj-$(CONFIG_GPIO_MAX7301) += gpio-max7301.o diff --git a/drivers/gpio/gpio-madera.c b/drivers/gpio/gpio-madera.c new file mode 100644 index 0000000..e45905d5 --- /dev/null +++ b/drivers/gpio/gpio-madera.c @@ -0,0 +1,196 @@ +/* + * GPIO support for Cirrus Logic Madera codecs + * + * Copyright 2015-2017 Cirrus Logic + * + * 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. + */ + +#include <linux/device.h> +#include <linux/gpio.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +#include <linux/mfd/madera/core.h> +#include <linux/mfd/madera/pdata.h> +#include <linux/mfd/madera/registers.h> + +struct madera_gpio { + struct madera *madera; + struct gpio_chip gpio_chip; +}; + +static int madera_gpio_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + struct madera_gpio *madera_gpio = gpiochip_get_data(chip); + struct madera *madera = madera_gpio->madera; + unsigned int val; + int ret; + + ret = regmap_read(madera->regmap, + MADERA_GPIO1_CTRL_2 + (2 * offset), &val); + if (ret < 0) + return ret; + + return (val & MADERA_GP1_DIR_MASK) >> MADERA_GP1_DIR_SHIFT; +} + +static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset) +{ + struct madera_gpio *madera_gpio = gpiochip_get_data(chip); + struct madera *madera = madera_gpio->madera; + + return regmap_update_bits(madera->regmap, + MADERA_GPIO1_CTRL_2 + (2 * offset), + MADERA_GP1_DIR_MASK, MADERA_GP1_DIR); +} + +static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct madera_gpio *madera_gpio = gpiochip_get_data(chip); + struct madera *madera = madera_gpio->madera; + unsigned int val; + int ret; + + ret = regmap_read(madera->regmap, + MADERA_GPIO1_CTRL_1 + (2 * offset), &val); + if (ret < 0) + return ret; + + return !!(val & MADERA_GP1_LVL_MASK); +} + +static int madera_gpio_direction_out(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct madera_gpio *madera_gpio = gpiochip_get_data(chip); + struct madera *madera = madera_gpio->madera; + unsigned int regval; + int ret; + + if (value) + regval = MADERA_GP1_LVL; + else + regval = 0; + + ret = regmap_update_bits(madera->regmap, + MADERA_GPIO1_CTRL_2 + (2 * offset), + MADERA_GP1_DIR_MASK, 0); + if (ret < 0) + return ret; + + return regmap_update_bits(madera->regmap, + MADERA_GPIO1_CTRL_1 + (2 * offset), + MADERA_GP1_LVL_MASK, regval); +} + +static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct madera_gpio *madera_gpio = gpiochip_get_data(chip); + struct madera *madera = madera_gpio->madera; + unsigned int regval; + int ret; + + if (value) + regval = MADERA_GP1_LVL; + else + regval = 0; + + ret = regmap_update_bits(madera->regmap, + MADERA_GPIO1_CTRL_1 + (2 * offset), + MADERA_GP1_LVL_MASK, regval); + if (ret) + dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n", + MADERA_GPIO1_CTRL_1 + (2 * offset), ret); +} + +static struct gpio_chip template_chip = { + .label = "madera", + .owner = THIS_MODULE, + .request = gpiochip_generic_request, + .free = gpiochip_generic_free, + .get_direction = madera_gpio_get_direction, + .direction_input = madera_gpio_direction_in, + .get = madera_gpio_get, + .direction_output = madera_gpio_direction_out, + .set = madera_gpio_set, + .set_config = gpiochip_generic_config, + .can_sleep = true, +}; + +static int madera_gpio_probe(struct platform_device *pdev) +{ + struct madera *madera = dev_get_drvdata(pdev->dev.parent); + struct madera_pdata *pdata = dev_get_platdata(madera->dev); + struct madera_gpio *madera_gpio; + int ret; + + madera_gpio = devm_kzalloc(&pdev->dev, sizeof(*madera_gpio), + GFP_KERNEL); + if (!madera_gpio) + return -ENOMEM; + + madera_gpio->madera = madera; + madera_gpio->gpio_chip = template_chip; + madera_gpio->gpio_chip.parent = &pdev->dev; + + if (IS_ENABLED(CONFIG_OF_GPIO)) + madera_gpio->gpio_chip.of_node = madera->dev->of_node; + + switch (madera->type) { + case CS47L35: + madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS; + break; + case CS47L85: + case WM1840: + madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS; + break; + case CS47L90: + case CS47L91: + madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS; + break; + default: + dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type); + return -EINVAL; + } + + if (pdata && pdata->gpio_base) + madera_gpio->gpio_chip.base = pdata->gpio_base; + else + madera_gpio->gpio_chip.base = -1; + + ret = devm_gpiochip_add_data(&pdev->dev, &madera_gpio->gpio_chip, + madera_gpio); + if (ret < 0) { + dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); + return ret; + } + + ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl", + 0, 0, madera_gpio->gpio_chip.ngpio); + if (ret) { + dev_warn(&pdev->dev, "Failed to add pin range (%d)\n", ret); + return ret; + } + + return 0; +} + +static struct platform_driver madera_gpio_driver = { + .driver.name = "madera-gpio", + .driver.owner = THIS_MODULE, + .probe = madera_gpio_probe, +}; + +module_platform_driver(madera_gpio_driver); + +MODULE_DESCRIPTION("GPIO interface for Madera codecs"); +MODULE_AUTHOR("Nariman Poushin nariman@opensource.wolfsonmicro.com"); +MODULE_AUTHOR("Richard Fitzgerald rf@opensource.wolfsonmicro.com"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:madera-gpio");