Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754199Ab2KQKBo (ORCPT ); Sat, 17 Nov 2012 05:01:44 -0500 Received: from antcom.de ([188.40.178.216]:40526 "EHLO chuck.antcom.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753590Ab2KQKBJ (ORCPT ); Sat, 17 Nov 2012 05:01:09 -0500 From: Roland Stigge To: gregkh@linuxfoundation.org, grant.likely@secretlab.ca, linus.walleij@linaro.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, w.sang@pengutronix.de, jbe@pengutronix.de, plagnioj@jcrosoft.com, highguy@gmail.com, broonie@opensource.wolfsonmicro.com, daniel-gl@gmx.net, rmallon@gmail.com Cc: Roland Stigge Subject: [PATCH 5/6 v7] gpio: Add device tree support to block GPIO API Date: Sat, 17 Nov 2012 10:59:52 +0100 Message-Id: <1353146393-19312-6-git-send-email-stigge@antcom.de> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1353146393-19312-1-git-send-email-stigge@antcom.de> References: <1353146393-19312-1-git-send-email-stigge@antcom.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4525 Lines: 151 This patch adds device tree support to the block GPIO API. Signed-off-by: Roland Stigge --- Documentation/devicetree/bindings/gpio/gpio-block.txt | 36 +++++++ drivers/gpio/Makefile | 1 drivers/gpio/gpioblock-of.c | 84 ++++++++++++++++++ 3 files changed, 121 insertions(+) --- /dev/null +++ linux-2.6/Documentation/devicetree/bindings/gpio/gpio-block.txt @@ -0,0 +1,36 @@ +Block GPIO definition +===================== + +This binding specifies arbitrary blocks of gpios, combining gpios from one or +more GPIO controllers together, to form a word for r/w access. + +Required property: +- compatible: must be "linux,gpio-block" + +Required subnodes: +- the name will be the registered name of the block +- property "gpios" is a list of gpios for the respective block + +Example: + + blockgpio { + compatible = "linux,gpio-block"; + + block0 { + gpios = <&gpio 3 0 0>, + <&gpio 3 1 0>; + }; + block1 { + gpios = <&gpio 4 1 0>, + <&gpio 4 3 0>, + <&gpio 4 2 0>, + <&gpio 4 4 0>, + <&gpio 4 5 0>, + <&gpio 4 6 0>, + <&gpio 4 7 0>, + <&gpio 4 8 0>, + <&gpio 4 9 0>, + <&gpio 4 10 0>, + <&gpio 4 19 0>; + }; + }; --- linux-2.6.orig/drivers/gpio/Makefile +++ linux-2.6/drivers/gpio/Makefile @@ -4,6 +4,7 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG obj-$(CONFIG_GPIOLIB) += gpiolib.o devres.o obj-$(CONFIG_OF_GPIO) += gpiolib-of.o +obj-$(CONFIG_OF_GPIO) += gpioblock-of.o # Device drivers. Generally keep list sorted alphabetically obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o --- /dev/null +++ linux-2.6/drivers/gpio/gpioblock-of.c @@ -0,0 +1,84 @@ +/* + * OF implementation for Block GPIO + * + * Copyright (C) 2012 Roland Stigge + * + * 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 + +static int __devinit gpioblock_of_probe(struct platform_device *pdev) +{ + struct device_node *block; + unsigned *gpios; + int ngpio; + int ret; + struct gpio_block *gb; + + for_each_available_child_of_node(pdev->dev.of_node, block) { + int i; + + ngpio = of_gpio_count(block); + gpios = kzalloc(ngpio * sizeof(*gpios), GFP_KERNEL); + if (!gpios) + return -ENOMEM; + for (i = 0; i < ngpio; i++) { + ret = of_get_gpio(block, i); + if (ret < 0) + return ret; /* expect -EPROBE_DEFER */ + gpios[i] = ret; + } + gb = gpio_block_create(gpios, ngpio, block->name); + if (IS_ERR(gb)) { + dev_err(&pdev->dev, + "Error creating GPIO block from device tree\n"); + return PTR_ERR(gb); + } + ret = gpio_block_register(gb); + if (ret < 0) { + gpio_block_free(gb); + return ret; + } + kfree(gpios); + dev_info(&pdev->dev, "Registered gpio block %s: %d gpios\n", + block->name, ngpio); + } + return 0; +} + +#ifdef CONFIG_OF +static struct of_device_id gpioblock_of_match[] __devinitdata = { + { .compatible = "linux,gpio-block", }, + { }, +}; +MODULE_DEVICE_TABLE(of, gpioblock_of_match); +#endif + +static struct platform_driver gpioblock_of_driver = { + .driver = { + .name = "gpio-block", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(gpioblock_of_match), + + }, + .probe = gpioblock_of_probe, +}; + +module_platform_driver(gpioblock_of_driver); + +MODULE_DESCRIPTION("GPIO Block driver"); +MODULE_AUTHOR("Roland Stigge "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:gpioblock-of"); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/