From patchwork Fri Dec 1 13:44:43 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Quentin Schulz X-Patchwork-Id: 843495 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3ypFwf16PHz9sNd for ; Sat, 2 Dec 2017 00:48:34 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753161AbdLANrQ (ORCPT ); Fri, 1 Dec 2017 08:47:16 -0500 Received: from mail.free-electrons.com ([62.4.15.54]:36231 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752803AbdLANpv (ORCPT ); Fri, 1 Dec 2017 08:45:51 -0500 Received: by mail.free-electrons.com (Postfix, from userid 110) id 138D1209E6; Fri, 1 Dec 2017 14:45:49 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT shortcircuit=ham autolearn=disabled version=3.4.0 Received: from localhost.localdomain (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.free-electrons.com (Postfix) with ESMTPSA id A338620976; Fri, 1 Dec 2017 14:45:38 +0100 (CET) From: Quentin Schulz To: linus.walleij@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, wens@csie.org, linux@armlinux.org.uk, maxime.ripard@free-electrons.com, lee.jones@linaro.org Cc: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, thomas.petazzoni@free-electrons.com, linux-sunxi@googlegroups.com, Quentin Schulz Subject: [PATCH v4 02/10] pinctrl: axp209: add pinctrl features Date: Fri, 1 Dec 2017 14:44:43 +0100 Message-Id: <71c9da94df2a5938cb8c092e40f8e36eec0b01c3.1512135804.git-series.quentin.schulz@free-electrons.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org 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 --- drivers/pinctrl/pinctrl-axp209.c | 306 +++++++++++++++++++++++++++++--- 1 file changed, 286 insertions(+), 20 deletions(-) diff --git a/drivers/pinctrl/pinctrl-axp209.c b/drivers/pinctrl/pinctrl-axp209.c index 4a346b7..2dc286f 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 + * Copyright (C) 2017 Quentin Schulz * * 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 @@ -18,6 +19,9 @@ #include #include #include +#include +#include +#include #include #include #include @@ -27,9 +31,52 @@ #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 + +#define AXP20X_MUX_GPIO_OUT 0 +#define AXP20X_MUX_GPIO_IN BIT(1) +#define AXP20X_MUX_ADC BIT(2) + +struct axp20x_pctrl_desc { + const struct pinctrl_pin_desc *pins; + unsigned int npins; + /* Stores the pins supporting LDO function. Bit offset is pin number. */ + u8 ldo_mask; + /* Stores the pins supporting ADC function. Bit offset is pin number. */ + u8 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 +95,7 @@ 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 +143,222 @@ 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) +{ + 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; + + /* + * We let the regulator framework handle the LDO muxing as muxing bits + * are basically also regulators on/off bits. It's better not to enforce + * any state of the regulator when selecting LDO mux so that we don't + * interfere with the regulator driver. + */ + if (function == AXP20X_FUNC_LDO) + return 0; + + 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) { - axp20x_gpio_output(chip, offset, value); + 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 = AXP20X_MUX_GPIO_OUT; + gpio->funcs[AXP20X_FUNC_GPIO_IN].name = "gpio_in"; + gpio->funcs[AXP20X_FUNC_GPIO_IN].muxval = AXP20X_MUX_GPIO_IN; + gpio->funcs[AXP20X_FUNC_LDO].name = "ldo"; + /* + * Muxval for LDO is useless as we won't use it. + * See comment in axp20x_pmx_set_mux. + */ + gpio->funcs[AXP20X_FUNC_ADC].name = "adc"; + gpio->funcs[AXP20X_FUNC_ADC].muxval = AXP20X_MUX_ADC; + + /* 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 +375,8 @@ 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; @@ -154,7 +387,30 @@ 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) { @@ -162,7 +418,16 @@ static int axp20x_gpio_probe(struct platform_device *pdev) 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 +449,6 @@ static struct platform_driver axp20x_gpio_driver = { module_platform_driver(axp20x_gpio_driver); MODULE_AUTHOR("Maxime Ripard "); -MODULE_DESCRIPTION("AXP20x PMIC GPIO driver"); +MODULE_AUTHOR("Quentin Schulz "); +MODULE_DESCRIPTION("AXP20x PMIC pinctrl and GPIO driver"); MODULE_LICENSE("GPL");