From patchwork Wed Mar 9 10:50:11 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 8545381 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 242AA9F2B4 for ; Wed, 9 Mar 2016 11:07:08 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D97D620204 for ; Wed, 9 Mar 2016 11:07:06 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9E5CF201D3 for ; Wed, 9 Mar 2016 11:07:05 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1adbvq-0003B1-AA; Wed, 09 Mar 2016 11:05:34 +0000 Received: from down.free-electrons.com ([37.187.137.238] helo=mail.free-electrons.com) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1adbvX-0001lY-1J for linux-arm-kernel@lists.infradead.org; Wed, 09 Mar 2016 11:05:16 +0000 Received: by mail.free-electrons.com (Postfix, from userid 110) id 2807F625; Wed, 9 Mar 2016 12:04:55 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from localhost (LFbn-1-2034-31.w90-76.abo.wanadoo.fr [90.76.103.31]) by mail.free-electrons.com (Postfix) with ESMTPSA id A95C7278A; Wed, 9 Mar 2016 11:50:17 +0100 (CET) From: Maxime Ripard To: Linus Walleij , Alexandre Courbot , Lee Jones , Chen-Yu Tsai Subject: [PATCH 1/4] gpio: Add AXP209 GPIO driver Date: Wed, 9 Mar 2016 11:50:11 +0100 Message-Id: <1457520614-32239-2-git-send-email-maxime.ripard@free-electrons.com> X-Mailer: git-send-email 2.7.2 In-Reply-To: <1457520614-32239-1-git-send-email-maxime.ripard@free-electrons.com> References: <1457520614-32239-1-git-send-email-maxime.ripard@free-electrons.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160309_030515_496351_91A3003F X-CRM114-Status: GOOD ( 21.61 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Hans de Goede , linux-sunxi@googlegroups.com, Maxime Ripard , 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 AXP209 PMIC has a bunch of GPIOs accessible, that are usually used to control LEDs or backlight. Add a driver for them Signed-off-by: Maxime Ripard Acked-by: Rob Herring --- .../devicetree/bindings/gpio/gpio-axp209.txt | 30 ++++ drivers/gpio/Kconfig | 6 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-axp209.c | 166 +++++++++++++++++++++ 4 files changed, 203 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-axp209.txt create mode 100644 drivers/gpio/gpio-axp209.c diff --git a/Documentation/devicetree/bindings/gpio/gpio-axp209.txt b/Documentation/devicetree/bindings/gpio/gpio-axp209.txt new file mode 100644 index 000000000000..a6611304dd3c --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-axp209.txt @@ -0,0 +1,30 @@ +AXP209 GPIO controller + +This driver follows the usual GPIO bindings found in +Documentation/devicetree/bindings/gpio/gpio.txt + +Required properties: +- compatible: Should be "x-powers,axp209-gpio" +- #gpio-cells: Should be two. The first cell is the pin number and the + second is the GPIO flags. +- gpio-controller: Marks the device node as a GPIO controller. + +This node must be a subnode of the axp20x PMIC, documented in +Documentation/devicetree/bindings/mfd/axp20x.txt + +Example: + +axp209: pmic@34 { + compatible = "x-powers,axp209"; + reg = <0x34>; + interrupt-parent = <&nmi_intc>; + interrupts = <0 IRQ_TYPE_LEVEL_LOW>; + interrupt-controller; + #interrupt-cells = <1>; + + axp_gpio: gpio { + compatible = "x-powers,axp209-gpio"; + gpio-controller; + #gpio-cells = <2>; + }; +}; diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 1118fef45a86..cd5ab93ac197 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -136,6 +136,12 @@ config GPIO_ATH79 Select this option to enable GPIO driver for Atheros AR71XX/AR724X/AR913X SoC devices. +config GPIO_AXP209 + tristate "X-Powers AXP209 PMIC GPIO Support" + depends on MFD_AXP20X + help + Say yes to enable GPIO support for the AXP209 PMIC + config GPIO_BCM_KONA bool "Broadcom Kona GPIO" depends on OF_GPIO && (ARCH_BCM_MOBILE || COMPILE_TEST) diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 6f969df1431a..e9e7fbe80ab7 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -25,6 +25,7 @@ obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o obj-$(CONFIG_GPIO_AMDPT) += gpio-amdpt.o obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o +obj-$(CONFIG_GPIO_AXP209) += gpio-axp209.o obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o diff --git a/drivers/gpio/gpio-axp209.c b/drivers/gpio/gpio-axp209.c new file mode 100644 index 000000000000..822f39faaadf --- /dev/null +++ b/drivers/gpio/gpio-axp209.c @@ -0,0 +1,166 @@ +/* + * AXP20x GPIO driver + * + * Copyright (C) 2016 Maxime Ripard + * + * 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 + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#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 + +struct axp20x_gpio { + struct gpio_chip chip; + struct regmap *regmap; +}; + +struct axp20x_gpio *to_axp20x_gpio(struct gpio_chip *chip) +{ + return container_of(chip, struct axp20x_gpio, chip); +} + +static int axp20x_gpio_get_reg(unsigned offset) +{ + switch (offset) { + case 0: + return AXP20X_GPIO0_CTRL; + case 1: + return AXP20X_GPIO1_CTRL; + case 2: + return AXP20X_GPIO2_CTRL; + } + + return -EINVAL; +} + +static int axp20x_gpio_input(struct gpio_chip *chip, unsigned offset) +{ + struct axp20x_gpio *gpio = to_axp20x_gpio(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); +} + +static int axp20x_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct axp20x_gpio *gpio = to_axp20x_gpio(chip); + unsigned int val; + int reg, ret; + + reg = axp20x_gpio_get_reg(offset); + if (reg < 0) + return reg; + + ret = regmap_read(gpio->regmap, reg, &val); + if (ret) + return ret; + + return val & (1 << (offset + 4)); +} + +static int axp20x_gpio_output(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct axp20x_gpio *gpio = to_axp20x_gpio(chip); + 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); +} + +static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset, + int value) +{ + axp20x_gpio_output(chip, offset, value); +} + +static int axp20x_gpio_probe(struct platform_device *pdev) +{ + struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); + struct axp20x_gpio *gpio; + int ret; + + if (!of_device_is_available(pdev->dev.of_node)) + return -ENODEV; + + if (!axp20x) { + dev_err(&pdev->dev, "Parent drvdata not set\n"); + return -EINVAL; + } + + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); + if (!gpio) + return -ENOMEM; + + gpio->chip.base = -1; + gpio->chip.can_sleep = true; + gpio->chip.dev = &pdev->dev; + gpio->chip.label = dev_name(&pdev->dev); + gpio->chip.owner = THIS_MODULE; + gpio->chip.get = axp20x_gpio_get; + gpio->chip.set = axp20x_gpio_set; + gpio->chip.direction_input = axp20x_gpio_input; + gpio->chip.direction_output = axp20x_gpio_output; + gpio->chip.ngpio = 3; + + gpio->regmap = axp20x->regmap; + + ret = gpiochip_add(&gpio->chip); + if (ret) { + dev_err(&pdev->dev, "Failed to register GPIO chip\n"); + return ret; + } + + dev_info(&pdev->dev, "AXP209 GPIO driver loaded\n"); + + return 0; +} + +static const struct of_device_id axp20x_gpio_match[] = { + { .compatible = "x-powers,axp209-gpio" }, + { } +}; +MODULE_DEVICE_TABLE(of, axp20x_gpio_match); + +static struct platform_driver axp20x_gpio_driver = { + .probe = axp20x_gpio_probe, + .driver = { + .name = "axp20x-gpio", + .of_match_table = axp20x_gpio_match, + }, +}; + +module_platform_driver(axp20x_gpio_driver); + +MODULE_AUTHOR("Maxime Ripard "); +MODULE_DESCRIPTION("AXP20x PMIC GPIO driver"); +MODULE_LICENSE("GPL");