From patchwork Mon Oct 2 12:08:44 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Quentin Schulz X-Patchwork-Id: 9980735 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 70B2960384 for ; Mon, 2 Oct 2017 12:11:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 61C0E28965 for ; Mon, 2 Oct 2017 12:11:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5662A28975; Mon, 2 Oct 2017 12:11:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 9B5EB28965 for ; Mon, 2 Oct 2017 12:11:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=AREe+j4m9T5ZMpie0ZxzdtGyDrx84O8oy0bk+i1xdc8=; b=oiqjJFLJNoTA9x72FbhMRIBF12 15pQHP0os+OtVMQHOXsb7tj7lcExELsnvKQpN6SjkPaQgOxQoXxQym2RzcGgxGeavXWyuMrwgsloh 0WNRsc9zEYsPjv6eNQ7vG/idfCDEvGj6F+syfiUjm+YcIDpDs1u3ez42wsGq+o37xBNiRq28Q1AmA i/xQnKyKuvL7yLHdv1WW+WoulJ0fGIRkBjTpkkZH0/a6FuN5nyWjlYAuamnz0XUKuKlWy9mrL06Jc vsbzplGugiw/F9XLmlcucjSS91ziuLsjapGFgBMACDo+qbfmQI39FyC9elIGPju39Ww1pIy2A2sqN mpDu2gKg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dyzZQ-0008So-MC; Mon, 02 Oct 2017 12:11:36 +0000 Received: from mail.free-electrons.com ([62.4.15.54]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dyzYH-0006KY-Id for linux-arm-kernel@lists.infradead.org; Mon, 02 Oct 2017 12:10:36 +0000 Received: by mail.free-electrons.com (Postfix, from userid 110) id B79EE20A19; Mon, 2 Oct 2017 14:10:01 +0200 (CEST) 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 58B4720A16; Mon, 2 Oct 2017 14:10:01 +0200 (CEST) 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 Subject: [PATCH v3 02/12] pinctrl: axp209: add pinctrl features Date: Mon, 2 Oct 2017 14:08:44 +0200 Message-Id: <20171002120854.5212-3-quentin.schulz@free-electrons.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171002120854.5212-1-quentin.schulz@free-electrons.com> References: <20171002120854.5212-1-quentin.schulz@free-electrons.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171002_051026_028244_FD20251A X-CRM114-Status: GOOD ( 20.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thomas.petazzoni@free-electrons.com, devicetree@vger.kernel.org, Quentin Schulz , linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-sunxi@googlegroups.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Acked-by: Rob Herring --- .../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 + * 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 @@ -22,14 +23,57 @@ #include #include +#include +#include +#include + #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 "); -MODULE_DESCRIPTION("AXP20x PMIC GPIO driver"); +MODULE_AUTHOR("Quentin Schulz "); +MODULE_DESCRIPTION("AXP20x PMIC pinctrl and GPIO driver"); MODULE_LICENSE("GPL");