From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754061AbbGAJoN (ORCPT ); Wed, 1 Jul 2015 05:44:13 -0400 Received: from mail-wi0-f181.google.com ([209.85.212.181]:36532 "EHLO mail-wi0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753633AbbGAJmi (ORCPT ); Wed, 1 Jul 2015 05:42:38 -0400 From: Tomeu Vizoso To: linux-kernel@vger.kernel.org Cc: Mark Brown , linux-acpi@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-pwm@vger.kernel.org, "Rafael J. Wysocki" , alsa-devel@alsa-project.org, Tomeu Vizoso , Linus Walleij , Alexandre Courbot Subject: [PATCH v2 04/12] gpio: register dependency parser for firmware nodes Date: Wed, 1 Jul 2015 11:40:59 +0200 Message-Id: <1435743667-11987-5-git-send-email-tomeu.vizoso@collabora.com> X-Mailer: git-send-email 2.4.1 In-Reply-To: <1435743667-11987-1-git-send-email-tomeu.vizoso@collabora.com> References: <1435743667-11987-1-git-send-email-tomeu.vizoso@collabora.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org So the GPIO subsystem can be queried about the dependencies of nodes that consume GPIOs, as specified in bindings/gpio/gpio.txt. Signed-off-by: Tomeu Vizoso --- Changes in v2: None drivers/gpio/gpiolib.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index bf4bd1d..6a3e83f 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2388,4 +2388,58 @@ static int __init gpiolib_debugfs_init(void) } subsys_initcall(gpiolib_debugfs_init); +static void gpio_get_dependencies(struct fwnode_handle *fwnode, + struct list_head *deps) +{ + struct device_node *np; + struct property *pp; + struct of_phandle_args pspec; + int count, i, ret; + + np = to_of_node(fwnode); + if (!np) + return; + + for_each_property_of_node(np, pp) { + if (strcmp(pp->name, "gpio") && + strcmp(pp->name, "gpios") && + !strends(pp->name, "-gpios") && + !strends(pp->name, "-gpio")) + continue; + + count = of_count_phandle_with_args(np, pp->name, + "#gpio-cells"); + for (i = 0; i < count; i++) { + ret = of_parse_phandle_with_args(np, pp->name, + "#gpio-cells", i, + &pspec); + if (ret || !pspec.np) + continue; + + fwnode_add_dependency(&pspec.np->fwnode, deps); + + of_node_put(pspec.np); + } + } + + for (i = 0;; i++) { + ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, + i, &pspec); + if (ret) + break; + + fwnode_add_dependency(&pspec.np->fwnode, deps); + + of_node_put(pspec.np); + } +} + +static int __init gpiolib_init(void) +{ + fwnode_add_dependency_parser(gpio_get_dependencies); + + return 0; +} +device_initcall(gpiolib_init); + #endif /* DEBUG_FS */ -- 2.4.1