| Message ID | 20171002120854.5212-3-quentin.schulz@free-electrons.com |
|---|---|
| State | New |
| Headers | show |
| Series | add pinmuxing support for pins in AXP209 and AXP813 PMICs | expand |
On Mon, Oct 02, 2017 at 12:08:44PM +0000, Quentin Schulz wrote: > The X-Powers AXP209 has 3 GPIOs. GPIO0/1 can each act either as a GPIO, > an ADC or a LDO regulator. GPIO2 can only act as a GPIO. > > This adds the pinctrl features to the driver so GPIO0/1 can be used as > ADC or LDO regulator. > > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> > --- > .../devicetree/bindings/pinctrl/pinctrl-axp209.txt | 28 +- > drivers/pinctrl/pinctrl-axp209.c | 293 +++++++++++++++++++-- > 2 files changed, 300 insertions(+), 21 deletions(-) > > diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt > index a6611304dd3c..388c04492afd 100644 > --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt > +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt > @@ -1,4 +1,4 @@ > -AXP209 GPIO controller > +AXP209 GPIO & pinctrl controller > > This driver follows the usual GPIO bindings found in > Documentation/devicetree/bindings/gpio/gpio.txt > @@ -28,3 +28,29 @@ axp209: pmic@34 { > #gpio-cells = <2>; > }; > }; > + > +The GPIOs can be muxed to other functions and therefore, must be a subnode of > +axp_gpio. > + > +Example: > + > +&axp_gpio { > + gpio0_adc: gpio0_adc { > + pins = "GPIO0"; > + function = "adc"; > + }; > +}; > + > +&example_node { > + pinctrl-names = "default"; > + pinctrl-0 = <&gpio0_adc>; > +}; > + > +GPIOs and their functions > +------------------------- > + > +GPIO | Functions > +------------------------ > +GPIO0 | gpio_in, gpio_out, ldo, adc > +GPIO1 | gpio_in, gpio_out, ldo, adc > +GPIO2 | gpio_in, gpio_out > diff --git a/drivers/pinctrl/pinctrl-axp209.c b/drivers/pinctrl/pinctrl-axp209.c > index 4a346b7b4172..96ef0cc28762 100644 > --- a/drivers/pinctrl/pinctrl-axp209.c > +++ b/drivers/pinctrl/pinctrl-axp209.c > @@ -1,7 +1,8 @@ > /* > - * AXP20x GPIO driver > + * AXP20x pinctrl and GPIO driver > * > * Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com> > + * Copyright (C) 2017 Quentin Schulz <quentin.schulz@free-electrons.com> > * > * This program is free software; you can redistribute it and/or modify it > * under the terms of the GNU General Public License as published by the > @@ -22,14 +23,57 @@ > #include <linux/regmap.h> > #include <linux/slab.h> > > +#include <linux/pinctrl/pinctrl.h> > +#include <linux/pinctrl/pinmux.h> > +#include <linux/pinctrl/pinconf-generic.h> > + You should order the headers by alphabetical order. > #define AXP20X_GPIO_FUNCTIONS 0x7 > #define AXP20X_GPIO_FUNCTION_OUT_LOW 0 > #define AXP20X_GPIO_FUNCTION_OUT_HIGH 1 > #define AXP20X_GPIO_FUNCTION_INPUT 2 > > +#define AXP20X_FUNC_GPIO_OUT 0 > +#define AXP20X_FUNC_GPIO_IN 1 > +#define AXP20X_FUNC_LDO 2 > +#define AXP20X_FUNC_ADC 3 > +#define AXP20X_FUNCS_NB 4 > + > +struct axp20x_pctrl_desc { > + const struct pinctrl_pin_desc *pins; > + unsigned int npins; > + /* Stores the pins supporting LDO function. Bit offset is pin number. */ > + unsigned int ldo_mask; > + /* Stores the pins supporting ADC function. Bit offset is pin number. */ > + unsigned int adc_mask; You can use u8 here. > +}; > + > +struct axp20x_pinctrl_function { > + const char *name; > + unsigned int muxval; > + const char **groups; > + unsigned int ngroups; > +}; > + > struct axp20x_gpio { > struct gpio_chip chip; > struct regmap *regmap; > + struct pinctrl_dev *pctl_dev; > + struct device *dev; > + const struct axp20x_pctrl_desc *desc; > + struct axp20x_pinctrl_function funcs[AXP20X_FUNCS_NB]; > +}; > + > +static const struct pinctrl_pin_desc axp209_pins[] = { > + PINCTRL_PIN(0, "GPIO0"), > + PINCTRL_PIN(1, "GPIO1"), > + PINCTRL_PIN(2, "GPIO2"), > +}; > + > +static const struct axp20x_pctrl_desc axp20x_data = { > + .pins = axp209_pins, > + .npins = ARRAY_SIZE(axp209_pins), > + .ldo_mask = BIT(0) | BIT(1), > + .adc_mask = BIT(0) | BIT(1), > }; > > static int axp20x_gpio_get_reg(unsigned offset) > @@ -48,16 +92,7 @@ static int axp20x_gpio_get_reg(unsigned offset) > > static int axp20x_gpio_input(struct gpio_chip *chip, unsigned offset) > { > - struct axp20x_gpio *gpio = gpiochip_get_data(chip); > - int reg; > - > - reg = axp20x_gpio_get_reg(offset); > - if (reg < 0) > - return reg; > - > - return regmap_update_bits(gpio->regmap, reg, > - AXP20X_GPIO_FUNCTIONS, > - AXP20X_GPIO_FUNCTION_INPUT); > + return pinctrl_gpio_direction_input(chip->base + offset); > } > > static int axp20x_gpio_get(struct gpio_chip *chip, unsigned offset) > @@ -105,29 +140,210 @@ static int axp20x_gpio_get_direction(struct gpio_chip *chip, unsigned offset) > static int axp20x_gpio_output(struct gpio_chip *chip, unsigned offset, > int value) > { > + chip->set(chip, offset, value); > + > + return 0; > +} > + > +static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset, > + int value) > +{ > struct axp20x_gpio *gpio = gpiochip_get_data(chip); > int reg; > > reg = axp20x_gpio_get_reg(offset); > if (reg < 0) > + return; > + > + regmap_update_bits(gpio->regmap, reg, > + AXP20X_GPIO_FUNCTIONS, > + value ? AXP20X_GPIO_FUNCTION_OUT_HIGH : > + AXP20X_GPIO_FUNCTION_OUT_LOW); > +} > + > +static int axp20x_pmx_set(struct pinctrl_dev *pctldev, unsigned int offset, > + u8 config) > +{ > + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); > + int reg; > + > + reg = axp20x_gpio_get_reg(offset); > + if (reg < 0) > return reg; > > - return regmap_update_bits(gpio->regmap, reg, > - AXP20X_GPIO_FUNCTIONS, > - value ? AXP20X_GPIO_FUNCTION_OUT_HIGH > - : AXP20X_GPIO_FUNCTION_OUT_LOW); > + return regmap_update_bits(gpio->regmap, reg, AXP20X_GPIO_FUNCTIONS, > + config); > } > > -static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset, > - int value) > +static int axp20x_pmx_func_cnt(struct pinctrl_dev *pctldev) > +{ > + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); > + > + return ARRAY_SIZE(gpio->funcs); > +} > + > +static const char *axp20x_pmx_func_name(struct pinctrl_dev *pctldev, > + unsigned int selector) > { > - axp20x_gpio_output(chip, offset, value); > + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); > + > + return gpio->funcs[selector].name; > +} > + > +static int axp20x_pmx_func_groups(struct pinctrl_dev *pctldev, > + unsigned int selector, > + const char * const **groups, > + unsigned int *num_groups) > +{ > + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); > + > + *groups = gpio->funcs[selector].groups; > + *num_groups = gpio->funcs[selector].ngroups; > + > + return 0; > +} > + > +static int axp20x_pmx_set_mux(struct pinctrl_dev *pctldev, > + unsigned int function, unsigned int group) > +{ > + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); > + unsigned int mask; > + > + /* Every pin supports GPIO_OUT and GPIO_IN functions */ > + if (function <= AXP20X_FUNC_GPIO_IN) > + return axp20x_pmx_set(pctldev, group, > + gpio->funcs[function].muxval); > + > + if (function == AXP20X_FUNC_LDO) > + mask = gpio->desc->ldo_mask; > + else > + mask = gpio->desc->adc_mask; > + > + if (!(BIT(group) & mask)) > + return -EINVAL; > + > + return axp20x_pmx_set(pctldev, group, gpio->funcs[function].muxval); > +} > + > +static int axp20x_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, > + struct pinctrl_gpio_range *range, > + unsigned int offset, bool input) > +{ > + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); > + > + if (input) > + return axp20x_pmx_set(pctldev, offset, > + gpio->funcs[AXP20X_FUNC_GPIO_IN].muxval); > + > + return axp20x_pmx_set(pctldev, offset, > + gpio->funcs[AXP20X_FUNC_GPIO_OUT].muxval); > +} > + > +static const struct pinmux_ops axp20x_pmx_ops = { > + .get_functions_count = axp20x_pmx_func_cnt, > + .get_function_name = axp20x_pmx_func_name, > + .get_function_groups = axp20x_pmx_func_groups, > + .set_mux = axp20x_pmx_set_mux, > + .gpio_set_direction = axp20x_pmx_gpio_set_direction, > + .strict = true, > +}; > + > +static int axp20x_groups_cnt(struct pinctrl_dev *pctldev) > +{ > + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); > + > + return gpio->desc->npins; > +} > + > +static int axp20x_group_pins(struct pinctrl_dev *pctldev, unsigned int selector, > + const unsigned int **pins, unsigned int *num_pins) > +{ > + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); > + > + *pins = (unsigned int *)&gpio->desc->pins[selector]; > + *num_pins = 1; > + > + return 0; > +} > + > +static const char *axp20x_group_name(struct pinctrl_dev *pctldev, > + unsigned int selector) > +{ > + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); > + > + return gpio->desc->pins[selector].name; > +} > + > +static const struct pinctrl_ops axp20x_pctrl_ops = { > + .dt_node_to_map = pinconf_generic_dt_node_to_map_group, > + .dt_free_map = pinconf_generic_dt_free_map, > + .get_groups_count = axp20x_groups_cnt, > + .get_group_name = axp20x_group_name, > + .get_group_pins = axp20x_group_pins, > +}; > + > +static void axp20x_funcs_groups_from_mask(struct device *dev, unsigned int mask, > + unsigned int mask_len, > + struct axp20x_pinctrl_function *func, > + const struct pinctrl_pin_desc *pins) > +{ > + unsigned long int mask_cpy = mask; > + const char **group; > + unsigned int ngroups = hweight8(mask); > + int bit; > + > + func->ngroups = ngroups; > + if (func->ngroups > 0) { > + func->groups = devm_kzalloc(dev, ngroups * sizeof(const char *), > + GFP_KERNEL); > + group = func->groups; > + for_each_set_bit(bit, &mask_cpy, mask_len) { > + *group = pins[bit].name; > + group++; > + } > + } > +} > + > +static void axp20x_build_funcs_groups(struct platform_device *pdev) > +{ > + struct axp20x_gpio *gpio = platform_get_drvdata(pdev); > + int i, pin; > + > + gpio->funcs[AXP20X_FUNC_GPIO_OUT].name = "gpio_out"; > + gpio->funcs[AXP20X_FUNC_GPIO_OUT].muxval = 0x0; > + gpio->funcs[AXP20X_FUNC_GPIO_IN].name = "gpio_in"; > + gpio->funcs[AXP20X_FUNC_GPIO_IN].muxval = 0x2; Why do you need hexadecimal values here? > + gpio->funcs[AXP20X_FUNC_LDO].name = "ldo"; > + gpio->funcs[AXP20X_FUNC_LDO].muxval = 0x3; > + gpio->funcs[AXP20X_FUNC_ADC].name = "adc"; > + gpio->funcs[AXP20X_FUNC_ADC].muxval = 0x4; And you probably can define that statically. > + /* Every pin supports GPIO_OUT and GPIO_IN functions */ > + for (i = 0; i <= AXP20X_FUNC_GPIO_IN; i++) { > + gpio->funcs[i].ngroups = gpio->desc->npins; > + gpio->funcs[i].groups = devm_kzalloc(&pdev->dev, > + gpio->desc->npins * sizeof(const char *), > + GFP_KERNEL); > + for (pin = 0; pin < gpio->desc->npins; pin++) > + gpio->funcs[i].groups[pin] = gpio->desc->pins[pin].name; > + } > + > + axp20x_funcs_groups_from_mask(&pdev->dev, gpio->desc->ldo_mask, > + gpio->desc->npins, > + &gpio->funcs[AXP20X_FUNC_LDO], > + gpio->desc->pins); > + > + axp20x_funcs_groups_from_mask(&pdev->dev, gpio->desc->adc_mask, > + gpio->desc->npins, > + &gpio->funcs[AXP20X_FUNC_ADC], > + gpio->desc->pins); > } > > static int axp20x_gpio_probe(struct platform_device *pdev) > { > struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); > struct axp20x_gpio *gpio; > + struct pinctrl_desc *pctrl_desc; > int ret; > > if (!of_device_is_available(pdev->dev.of_node)) > @@ -144,6 +360,8 @@ static int axp20x_gpio_probe(struct platform_device *pdev) > > gpio->chip.base = -1; > gpio->chip.can_sleep = true; > + gpio->chip.request = gpiochip_generic_request; > + gpio->chip.free = gpiochip_generic_free; > gpio->chip.parent = &pdev->dev; > gpio->chip.label = dev_name(&pdev->dev); > gpio->chip.owner = THIS_MODULE; > @@ -154,15 +372,49 @@ static int axp20x_gpio_probe(struct platform_device *pdev) > gpio->chip.direction_output = axp20x_gpio_output; > gpio->chip.ngpio = 3; > > + gpio->desc = &axp20x_data; > + > gpio->regmap = axp20x->regmap; > > + gpio->dev = &pdev->dev; > + Why do you need new lines between each affectation? > + platform_set_drvdata(pdev, gpio); > + > + axp20x_build_funcs_groups(pdev); > + > + pctrl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctrl_desc), GFP_KERNEL); > + if (!pctrl_desc) > + return -ENOMEM; > + > + pctrl_desc->name = dev_name(&pdev->dev); > + pctrl_desc->owner = THIS_MODULE; > + pctrl_desc->pins = gpio->desc->pins; > + pctrl_desc->npins = gpio->desc->npins; > + pctrl_desc->pctlops = &axp20x_pctrl_ops; > + pctrl_desc->pmxops = &axp20x_pmx_ops; > + > + gpio->pctl_dev = devm_pinctrl_register(&pdev->dev, pctrl_desc, gpio); > + if (IS_ERR(gpio->pctl_dev)) { > + dev_err(&pdev->dev, "couldn't register pinctrl driver\n"); > + return PTR_ERR(gpio->pctl_dev); > + } > + > ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); > if (ret) { > dev_err(&pdev->dev, "Failed to register GPIO chip\n"); > return ret; > } > > - dev_info(&pdev->dev, "AXP209 GPIO driver loaded\n"); > + ret = gpiochip_add_pin_range(&gpio->chip, dev_name(&pdev->dev), > + gpio->desc->pins->number, > + gpio->desc->pins->number, > + gpio->desc->npins); > + if (ret) { > + dev_err(&pdev->dev, "failed to add pin range\n"); > + return ret; > + } > + > + dev_info(&pdev->dev, "AXP209 pinctrl and GPIO driver loaded\n"); > > return 0; > } > @@ -184,5 +436,6 @@ static struct platform_driver axp20x_gpio_driver = { > module_platform_driver(axp20x_gpio_driver); > > MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); > -MODULE_DESCRIPTION("AXP20x PMIC GPIO driver"); > +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); > +MODULE_DESCRIPTION("AXP20x PMIC pinctrl and GPIO driver"); > MODULE_LICENSE("GPL"); Looks much better otherwise, thanks! Maxime
On Mon, Oct 02, 2017 at 02:08:44PM +0200, Quentin Schulz wrote: > The X-Powers AXP209 has 3 GPIOs. GPIO0/1 can each act either as a GPIO, > an ADC or a LDO regulator. GPIO2 can only act as a GPIO. > > This adds the pinctrl features to the driver so GPIO0/1 can be used as > ADC or LDO regulator. > > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> > --- > .../devicetree/bindings/pinctrl/pinctrl-axp209.txt | 28 +- In the future, please split bindings to separate patch. > drivers/pinctrl/pinctrl-axp209.c | 293 +++++++++++++++++++-- > 2 files changed, 300 insertions(+), 21 deletions(-) > > diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt > index a6611304dd3c..388c04492afd 100644 > --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt > +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt > @@ -1,4 +1,4 @@ > -AXP209 GPIO controller > +AXP209 GPIO & pinctrl controller > > This driver follows the usual GPIO bindings found in > Documentation/devicetree/bindings/gpio/gpio.txt > @@ -28,3 +28,29 @@ axp209: pmic@34 { > #gpio-cells = <2>; > }; > }; > + > +The GPIOs can be muxed to other functions and therefore, must be a subnode of > +axp_gpio. > + > +Example: > + > +&axp_gpio { > + gpio0_adc: gpio0_adc { Use '-' rather than '_' for node names. With that, Acked-by: Rob Herring <robh@kernel.org> > + pins = "GPIO0"; > + function = "adc"; > + }; > +}; > + > +&example_node { > + pinctrl-names = "default"; > + pinctrl-0 = <&gpio0_adc>; > +}; > + > +GPIOs and their functions > +------------------------- > + > +GPIO | Functions > +------------------------ > +GPIO0 | gpio_in, gpio_out, ldo, adc > +GPIO1 | gpio_in, gpio_out, ldo, adc > +GPIO2 | gpio_in, gpio_out -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt index a6611304dd3c..388c04492afd 100644 --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-axp209.txt @@ -1,4 +1,4 @@ -AXP209 GPIO controller +AXP209 GPIO & pinctrl controller This driver follows the usual GPIO bindings found in Documentation/devicetree/bindings/gpio/gpio.txt @@ -28,3 +28,29 @@ axp209: pmic@34 { #gpio-cells = <2>; }; }; + +The GPIOs can be muxed to other functions and therefore, must be a subnode of +axp_gpio. + +Example: + +&axp_gpio { + gpio0_adc: gpio0_adc { + pins = "GPIO0"; + function = "adc"; + }; +}; + +&example_node { + pinctrl-names = "default"; + pinctrl-0 = <&gpio0_adc>; +}; + +GPIOs and their functions +------------------------- + +GPIO | Functions +------------------------ +GPIO0 | gpio_in, gpio_out, ldo, adc +GPIO1 | gpio_in, gpio_out, ldo, adc +GPIO2 | gpio_in, gpio_out diff --git a/drivers/pinctrl/pinctrl-axp209.c b/drivers/pinctrl/pinctrl-axp209.c index 4a346b7b4172..96ef0cc28762 100644 --- a/drivers/pinctrl/pinctrl-axp209.c +++ b/drivers/pinctrl/pinctrl-axp209.c @@ -1,7 +1,8 @@ /* - * AXP20x GPIO driver + * AXP20x pinctrl and GPIO driver * * Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com> + * Copyright (C) 2017 Quentin Schulz <quentin.schulz@free-electrons.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -22,14 +23,57 @@ #include <linux/regmap.h> #include <linux/slab.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/pinctrl/pinconf-generic.h> + #define AXP20X_GPIO_FUNCTIONS 0x7 #define AXP20X_GPIO_FUNCTION_OUT_LOW 0 #define AXP20X_GPIO_FUNCTION_OUT_HIGH 1 #define AXP20X_GPIO_FUNCTION_INPUT 2 +#define AXP20X_FUNC_GPIO_OUT 0 +#define AXP20X_FUNC_GPIO_IN 1 +#define AXP20X_FUNC_LDO 2 +#define AXP20X_FUNC_ADC 3 +#define AXP20X_FUNCS_NB 4 + +struct axp20x_pctrl_desc { + const struct pinctrl_pin_desc *pins; + unsigned int npins; + /* Stores the pins supporting LDO function. Bit offset is pin number. */ + unsigned int ldo_mask; + /* Stores the pins supporting ADC function. Bit offset is pin number. */ + unsigned int adc_mask; +}; + +struct axp20x_pinctrl_function { + const char *name; + unsigned int muxval; + const char **groups; + unsigned int ngroups; +}; + struct axp20x_gpio { struct gpio_chip chip; struct regmap *regmap; + struct pinctrl_dev *pctl_dev; + struct device *dev; + const struct axp20x_pctrl_desc *desc; + struct axp20x_pinctrl_function funcs[AXP20X_FUNCS_NB]; +}; + +static const struct pinctrl_pin_desc axp209_pins[] = { + PINCTRL_PIN(0, "GPIO0"), + PINCTRL_PIN(1, "GPIO1"), + PINCTRL_PIN(2, "GPIO2"), +}; + +static const struct axp20x_pctrl_desc axp20x_data = { + .pins = axp209_pins, + .npins = ARRAY_SIZE(axp209_pins), + .ldo_mask = BIT(0) | BIT(1), + .adc_mask = BIT(0) | BIT(1), }; static int axp20x_gpio_get_reg(unsigned offset) @@ -48,16 +92,7 @@ static int axp20x_gpio_get_reg(unsigned offset) static int axp20x_gpio_input(struct gpio_chip *chip, unsigned offset) { - struct axp20x_gpio *gpio = gpiochip_get_data(chip); - int reg; - - reg = axp20x_gpio_get_reg(offset); - if (reg < 0) - return reg; - - return regmap_update_bits(gpio->regmap, reg, - AXP20X_GPIO_FUNCTIONS, - AXP20X_GPIO_FUNCTION_INPUT); + return pinctrl_gpio_direction_input(chip->base + offset); } static int axp20x_gpio_get(struct gpio_chip *chip, unsigned offset) @@ -105,29 +140,210 @@ static int axp20x_gpio_get_direction(struct gpio_chip *chip, unsigned offset) static int axp20x_gpio_output(struct gpio_chip *chip, unsigned offset, int value) { + chip->set(chip, offset, value); + + return 0; +} + +static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset, + int value) +{ struct axp20x_gpio *gpio = gpiochip_get_data(chip); int reg; reg = axp20x_gpio_get_reg(offset); if (reg < 0) + return; + + regmap_update_bits(gpio->regmap, reg, + AXP20X_GPIO_FUNCTIONS, + value ? AXP20X_GPIO_FUNCTION_OUT_HIGH : + AXP20X_GPIO_FUNCTION_OUT_LOW); +} + +static int axp20x_pmx_set(struct pinctrl_dev *pctldev, unsigned int offset, + u8 config) +{ + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); + int reg; + + reg = axp20x_gpio_get_reg(offset); + if (reg < 0) return reg; - return regmap_update_bits(gpio->regmap, reg, - AXP20X_GPIO_FUNCTIONS, - value ? AXP20X_GPIO_FUNCTION_OUT_HIGH - : AXP20X_GPIO_FUNCTION_OUT_LOW); + return regmap_update_bits(gpio->regmap, reg, AXP20X_GPIO_FUNCTIONS, + config); } -static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset, - int value) +static int axp20x_pmx_func_cnt(struct pinctrl_dev *pctldev) +{ + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); + + return ARRAY_SIZE(gpio->funcs); +} + +static const char *axp20x_pmx_func_name(struct pinctrl_dev *pctldev, + unsigned int selector) { - axp20x_gpio_output(chip, offset, value); + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); + + return gpio->funcs[selector].name; +} + +static int axp20x_pmx_func_groups(struct pinctrl_dev *pctldev, + unsigned int selector, + const char * const **groups, + unsigned int *num_groups) +{ + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); + + *groups = gpio->funcs[selector].groups; + *num_groups = gpio->funcs[selector].ngroups; + + return 0; +} + +static int axp20x_pmx_set_mux(struct pinctrl_dev *pctldev, + unsigned int function, unsigned int group) +{ + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); + unsigned int mask; + + /* Every pin supports GPIO_OUT and GPIO_IN functions */ + if (function <= AXP20X_FUNC_GPIO_IN) + return axp20x_pmx_set(pctldev, group, + gpio->funcs[function].muxval); + + if (function == AXP20X_FUNC_LDO) + mask = gpio->desc->ldo_mask; + else + mask = gpio->desc->adc_mask; + + if (!(BIT(group) & mask)) + return -EINVAL; + + return axp20x_pmx_set(pctldev, group, gpio->funcs[function].muxval); +} + +static int axp20x_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int offset, bool input) +{ + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); + + if (input) + return axp20x_pmx_set(pctldev, offset, + gpio->funcs[AXP20X_FUNC_GPIO_IN].muxval); + + return axp20x_pmx_set(pctldev, offset, + gpio->funcs[AXP20X_FUNC_GPIO_OUT].muxval); +} + +static const struct pinmux_ops axp20x_pmx_ops = { + .get_functions_count = axp20x_pmx_func_cnt, + .get_function_name = axp20x_pmx_func_name, + .get_function_groups = axp20x_pmx_func_groups, + .set_mux = axp20x_pmx_set_mux, + .gpio_set_direction = axp20x_pmx_gpio_set_direction, + .strict = true, +}; + +static int axp20x_groups_cnt(struct pinctrl_dev *pctldev) +{ + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); + + return gpio->desc->npins; +} + +static int axp20x_group_pins(struct pinctrl_dev *pctldev, unsigned int selector, + const unsigned int **pins, unsigned int *num_pins) +{ + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); + + *pins = (unsigned int *)&gpio->desc->pins[selector]; + *num_pins = 1; + + return 0; +} + +static const char *axp20x_group_name(struct pinctrl_dev *pctldev, + unsigned int selector) +{ + struct axp20x_gpio *gpio = pinctrl_dev_get_drvdata(pctldev); + + return gpio->desc->pins[selector].name; +} + +static const struct pinctrl_ops axp20x_pctrl_ops = { + .dt_node_to_map = pinconf_generic_dt_node_to_map_group, + .dt_free_map = pinconf_generic_dt_free_map, + .get_groups_count = axp20x_groups_cnt, + .get_group_name = axp20x_group_name, + .get_group_pins = axp20x_group_pins, +}; + +static void axp20x_funcs_groups_from_mask(struct device *dev, unsigned int mask, + unsigned int mask_len, + struct axp20x_pinctrl_function *func, + const struct pinctrl_pin_desc *pins) +{ + unsigned long int mask_cpy = mask; + const char **group; + unsigned int ngroups = hweight8(mask); + int bit; + + func->ngroups = ngroups; + if (func->ngroups > 0) { + func->groups = devm_kzalloc(dev, ngroups * sizeof(const char *), + GFP_KERNEL); + group = func->groups; + for_each_set_bit(bit, &mask_cpy, mask_len) { + *group = pins[bit].name; + group++; + } + } +} + +static void axp20x_build_funcs_groups(struct platform_device *pdev) +{ + struct axp20x_gpio *gpio = platform_get_drvdata(pdev); + int i, pin; + + gpio->funcs[AXP20X_FUNC_GPIO_OUT].name = "gpio_out"; + gpio->funcs[AXP20X_FUNC_GPIO_OUT].muxval = 0x0; + gpio->funcs[AXP20X_FUNC_GPIO_IN].name = "gpio_in"; + gpio->funcs[AXP20X_FUNC_GPIO_IN].muxval = 0x2; + gpio->funcs[AXP20X_FUNC_LDO].name = "ldo"; + gpio->funcs[AXP20X_FUNC_LDO].muxval = 0x3; + gpio->funcs[AXP20X_FUNC_ADC].name = "adc"; + gpio->funcs[AXP20X_FUNC_ADC].muxval = 0x4; + + /* Every pin supports GPIO_OUT and GPIO_IN functions */ + for (i = 0; i <= AXP20X_FUNC_GPIO_IN; i++) { + gpio->funcs[i].ngroups = gpio->desc->npins; + gpio->funcs[i].groups = devm_kzalloc(&pdev->dev, + gpio->desc->npins * sizeof(const char *), + GFP_KERNEL); + for (pin = 0; pin < gpio->desc->npins; pin++) + gpio->funcs[i].groups[pin] = gpio->desc->pins[pin].name; + } + + axp20x_funcs_groups_from_mask(&pdev->dev, gpio->desc->ldo_mask, + gpio->desc->npins, + &gpio->funcs[AXP20X_FUNC_LDO], + gpio->desc->pins); + + axp20x_funcs_groups_from_mask(&pdev->dev, gpio->desc->adc_mask, + gpio->desc->npins, + &gpio->funcs[AXP20X_FUNC_ADC], + gpio->desc->pins); } static int axp20x_gpio_probe(struct platform_device *pdev) { struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); struct axp20x_gpio *gpio; + struct pinctrl_desc *pctrl_desc; int ret; if (!of_device_is_available(pdev->dev.of_node)) @@ -144,6 +360,8 @@ static int axp20x_gpio_probe(struct platform_device *pdev) gpio->chip.base = -1; gpio->chip.can_sleep = true; + gpio->chip.request = gpiochip_generic_request; + gpio->chip.free = gpiochip_generic_free; gpio->chip.parent = &pdev->dev; gpio->chip.label = dev_name(&pdev->dev); gpio->chip.owner = THIS_MODULE; @@ -154,15 +372,49 @@ static int axp20x_gpio_probe(struct platform_device *pdev) gpio->chip.direction_output = axp20x_gpio_output; gpio->chip.ngpio = 3; + gpio->desc = &axp20x_data; + gpio->regmap = axp20x->regmap; + gpio->dev = &pdev->dev; + + platform_set_drvdata(pdev, gpio); + + axp20x_build_funcs_groups(pdev); + + pctrl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctrl_desc), GFP_KERNEL); + if (!pctrl_desc) + return -ENOMEM; + + pctrl_desc->name = dev_name(&pdev->dev); + pctrl_desc->owner = THIS_MODULE; + pctrl_desc->pins = gpio->desc->pins; + pctrl_desc->npins = gpio->desc->npins; + pctrl_desc->pctlops = &axp20x_pctrl_ops; + pctrl_desc->pmxops = &axp20x_pmx_ops; + + gpio->pctl_dev = devm_pinctrl_register(&pdev->dev, pctrl_desc, gpio); + if (IS_ERR(gpio->pctl_dev)) { + dev_err(&pdev->dev, "couldn't register pinctrl driver\n"); + return PTR_ERR(gpio->pctl_dev); + } + ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); if (ret) { dev_err(&pdev->dev, "Failed to register GPIO chip\n"); return ret; } - dev_info(&pdev->dev, "AXP209 GPIO driver loaded\n"); + ret = gpiochip_add_pin_range(&gpio->chip, dev_name(&pdev->dev), + gpio->desc->pins->number, + gpio->desc->pins->number, + gpio->desc->npins); + if (ret) { + dev_err(&pdev->dev, "failed to add pin range\n"); + return ret; + } + + dev_info(&pdev->dev, "AXP209 pinctrl and GPIO driver loaded\n"); return 0; } @@ -184,5 +436,6 @@ static struct platform_driver axp20x_gpio_driver = { module_platform_driver(axp20x_gpio_driver); MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); -MODULE_DESCRIPTION("AXP20x PMIC GPIO driver"); +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); +MODULE_DESCRIPTION("AXP20x PMIC pinctrl and GPIO driver"); MODULE_LICENSE("GPL");
The X-Powers AXP209 has 3 GPIOs. GPIO0/1 can each act either as a GPIO, an ADC or a LDO regulator. GPIO2 can only act as a GPIO. This adds the pinctrl features to the driver so GPIO0/1 can be used as ADC or LDO regulator. Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> --- .../devicetree/bindings/pinctrl/pinctrl-axp209.txt | 28 +- drivers/pinctrl/pinctrl-axp209.c | 293 +++++++++++++++++++-- 2 files changed, 300 insertions(+), 21 deletions(-)