From patchwork Wed Jul 1 09:40:59 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomeu Vizoso X-Patchwork-Id: 490008 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id D58F61402B9 for ; Wed, 1 Jul 2015 19:43:54 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=QmA9LKX8; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753811AbbGAJnt (ORCPT ); Wed, 1 Jul 2015 05:43:49 -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 Received: by widjy10 with SMTP id jy10so52482119wid.1; Wed, 01 Jul 2015 02:42:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=jWL0LpCirlo+C8PPm8MolQrXIxjULHGkv/FhaE+jPaU=; b=QmA9LKX8CdVPHcbYq7l6yr7EC4gjwxOWNCPxlNQ/KAhzhAZ7LVOyPD0njJI0Hnvpk1 4jVkISuy1/giR/fAC0kfiOuEl94ifwy/YlW+qe3vwTl3RllPX+dusW8oyNzgaCPOdYdx vLhqBwSqq+IipybSLHgp+9B12Qol3wyzWknVZ8cJIZXJf98T1gN+MLdSfuNO/JmG9VVh zihiqruf/R2+X4bLjxTK0PEF9kxkBel1Nq6n3ggfFU7zmCIWkfJWJC2eiqFmVWd4K+Fh SMHREF613DOm/Pmb5+oVGMHWvtUDW5lzuqd9RlcYlkX42F82CCj7IH2fL7omtS87G1Yn TpRA== X-Received: by 10.194.178.201 with SMTP id da9mr4457309wjc.139.1435743756081; Wed, 01 Jul 2015 02:42:36 -0700 (PDT) Received: from cizrna.lan ([109.72.12.160]) by mx.google.com with ESMTPSA id x10sm1992663wjr.25.2015.07.01.02.42.34 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 01 Jul 2015 02:42:34 -0700 (PDT) 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-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@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 */