From patchwork Wed Jan 28 18:15:49 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Javier Martinez Canillas X-Patchwork-Id: 5731241 Return-Path: X-Original-To: patchwork-linux-mmc@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 F12D89F38B for ; Wed, 28 Jan 2015 21:38:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0386F201DD for ; Wed, 28 Jan 2015 21:38:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 011D42018E for ; Wed, 28 Jan 2015 21:38:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754440AbbA1Vh6 (ORCPT ); Wed, 28 Jan 2015 16:37:58 -0500 Received: from bhuna.collabora.co.uk ([93.93.135.160]:46212 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754982AbbA1Umn (ORCPT ); Wed, 28 Jan 2015 15:42:43 -0500 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: javier) with ESMTPSA id 0B8A8600EC9 From: Javier Martinez Canillas To: Ulf Hansson Cc: Kukjin Kim , Doug Anderson , Olof Johansson , Arend van Spriel , Srinivas Kandagatla , linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Javier Martinez Canillas Subject: [PATCH v2 2/6] mmc: pwrseq_simple: Extend to support more pins Date: Wed, 28 Jan 2015 19:15:49 +0100 Message-Id: <1422468953-7594-3-git-send-email-javier.martinez@collabora.co.uk> X-Mailer: git-send-email 2.1.3 In-Reply-To: <1422468953-7594-1-git-send-email-javier.martinez@collabora.co.uk> References: <1422468953-7594-1-git-send-email-javier.martinez@collabora.co.uk> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Many WLAN attached to a SDIO/MMC interface, needs more than one pin for their reset sequence. For example, is very common for chips to have two pins: one for reset and one for power enable. This patch adds support for more reset pins to the pwrseq_simple driver and instead hardcoding a fixed number, it uses the of_gpio_named_count() since the MMC power sequence is only built when CONFIG_OF is enabled. Signed-off-by: Javier Martinez Canillas Signed-off-by: Srinivas Kandagatla --- Changes since v1: - Many code cleanups suggested by Srinivas Kandagatla * Rename reset_gpio array to reset_gpios. * Use a zero length array for reset_gpios to avoid a kmalloc. * Refactor GPIO assert and de-ssert logic into a common function. * Simplify gpiod_put logic in case of gpiod_get error. --- drivers/mmc/core/pwrseq_simple.c | 55 +++++++++++++++++++++++++++++----------- 1 file changed, 40 insertions(+), 15 deletions(-) diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c index 0958c696137f..e53d3c7e059c 100644 --- a/drivers/mmc/core/pwrseq_simple.c +++ b/drivers/mmc/core/pwrseq_simple.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -19,16 +20,26 @@ struct mmc_pwrseq_simple { struct mmc_pwrseq pwrseq; - struct gpio_desc *reset_gpio; + int nr_gpios; + struct gpio_desc *reset_gpios[0]; }; +static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq, + int value) +{ + int i; + + for (i = 0; i < pwrseq->nr_gpios; i++) + if (!IS_ERR(pwrseq->reset_gpios[i])) + gpiod_set_value_cansleep(pwrseq->reset_gpios[i], value); +} + static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host) { struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq, struct mmc_pwrseq_simple, pwrseq); - if (!IS_ERR(pwrseq->reset_gpio)) - gpiod_set_value_cansleep(pwrseq->reset_gpio, 1); + mmc_pwrseq_simple_set_gpios_value(pwrseq, 1); } static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host) @@ -36,17 +47,18 @@ static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host) struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq, struct mmc_pwrseq_simple, pwrseq); - if (!IS_ERR(pwrseq->reset_gpio)) - gpiod_set_value_cansleep(pwrseq->reset_gpio, 0); + mmc_pwrseq_simple_set_gpios_value(pwrseq, 0); } static void mmc_pwrseq_simple_free(struct mmc_host *host) { struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq, struct mmc_pwrseq_simple, pwrseq); + int i; - if (!IS_ERR(pwrseq->reset_gpio)) - gpiod_put(pwrseq->reset_gpio); + for (i = 0; i < pwrseq->nr_gpios; i++) + if (!IS_ERR(pwrseq->reset_gpios[i])) + gpiod_put(pwrseq->reset_gpios[i]); kfree(pwrseq); host->pwrseq = NULL; @@ -62,20 +74,33 @@ static struct mmc_pwrseq_ops mmc_pwrseq_simple_ops = { int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev) { struct mmc_pwrseq_simple *pwrseq; - int ret = 0; + int i, nr_gpios, ret = 0; - pwrseq = kzalloc(sizeof(struct mmc_pwrseq_simple), GFP_KERNEL); + nr_gpios = of_gpio_named_count(dev->of_node, "reset-gpios"); + if (nr_gpios < 0) + nr_gpios = 0; + + pwrseq = kzalloc(sizeof(struct mmc_pwrseq_simple) + nr_gpios * + sizeof(struct gpio_desc *), GFP_KERNEL); if (!pwrseq) return -ENOMEM; - pwrseq->reset_gpio = gpiod_get_index(dev, "reset", 0, GPIOD_OUT_HIGH); - if (IS_ERR(pwrseq->reset_gpio) && - PTR_ERR(pwrseq->reset_gpio) != -ENOENT && - PTR_ERR(pwrseq->reset_gpio) != -ENOSYS) { - ret = PTR_ERR(pwrseq->reset_gpio); - goto free; + for (i = 0; i < nr_gpios; i++) { + pwrseq->reset_gpios[i] = gpiod_get_index(dev, "reset", i, + GPIOD_OUT_HIGH); + if (IS_ERR(pwrseq->reset_gpios[i]) && + PTR_ERR(pwrseq->reset_gpios[i]) != -ENOENT && + PTR_ERR(pwrseq->reset_gpios[i]) != -ENOSYS) { + ret = PTR_ERR(pwrseq->reset_gpios[i]); + + while (--i) + gpiod_put(pwrseq->reset_gpios[i]); + + goto free; + } } + pwrseq->nr_gpios = nr_gpios; pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops; host->pwrseq = &pwrseq->pwrseq;