From patchwork Wed Oct 17 12:31:36 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roland Stigge X-Patchwork-Id: 1605731 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 038463FD4F for ; Wed, 17 Oct 2012 12:42:10 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TOSuN-000522-3K; Wed, 17 Oct 2012 12:39:36 +0000 Received: from mail.work-microwave.de ([62.245.205.51] helo=work-microwave.de) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TOSsM-00046C-2j for linux-arm-kernel@lists.infradead.org; Wed, 17 Oct 2012 12:37:34 +0000 Received: from rst-pc1.lan.work-microwave.de ([192.168.11.78]) (authenticated bits=0) by mail.work-microwave.de with ESMTP id q9HCbJd5025478 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 17 Oct 2012 13:37:19 +0100 Received: by rst-pc1.lan.work-microwave.de (Postfix, from userid 1000) id EA9A7AE06B; Wed, 17 Oct 2012 14:37:18 +0200 (CEST) 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 Subject: [PATCH RFC 04/15 v5] gpio: Add device tree support to block GPIO API Date: Wed, 17 Oct 2012 14:31:36 +0200 Message-Id: <1350477107-26512-5-git-send-email-stigge@antcom.de> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1350477107-26512-1-git-send-email-stigge@antcom.de> References: <1350477107-26512-1-git-send-email-stigge@antcom.de> X-FEAS-SYSTEM-WL: rst@work-microwave.de, 192.168.11.78 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Roland Stigge X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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");