From patchwork Wed Jan 28 10:10:16 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: 5727751 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 6F2FEBF440 for ; Wed, 28 Jan 2015 10:12:59 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 853792026F for ; Wed, 28 Jan 2015 10:12:58 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9920920256 for ; Wed, 28 Jan 2015 10:12:57 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YGPag-0003V3-Eg; Wed, 28 Jan 2015 10:11:18 +0000 Received: from bhuna.collabora.co.uk ([93.93.135.160]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YGPaN-00036e-Mr for linux-arm-kernel@lists.infradead.org; Wed, 28 Jan 2015 10:11:00 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: javier) with ESMTPSA id 663B4600E23 From: Javier Martinez Canillas To: Ulf Hansson Subject: [PATCH 2/5] mmc: pwrseq_simple: Extend to support more pins Date: Wed, 28 Jan 2015 11:10:16 +0100 Message-Id: <1422439819-29854-3-git-send-email-javier.martinez@collabora.co.uk> X-Mailer: git-send-email 2.1.3 In-Reply-To: <1422439819-29854-1-git-send-email-javier.martinez@collabora.co.uk> References: <1422439819-29854-1-git-send-email-javier.martinez@collabora.co.uk> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150128_021100_093278_A6A4E657 X-CRM114-Status: GOOD ( 16.00 ) X-Spam-Score: -0.0 (/) Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-mmc@vger.kernel.org, Doug Anderson , linux-kernel@vger.kernel.org, Kukjin Kim , Olof Johansson , Javier Martinez Canillas , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 --- drivers/mmc/core/pwrseq_simple.c | 54 ++++++++++++++++++++++++++++++---------- 1 file changed, 41 insertions(+), 13 deletions(-) diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c index 0958c696137f..9e51fe1051c5 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 @@ -19,34 +20,44 @@ struct mmc_pwrseq_simple { struct mmc_pwrseq pwrseq; - struct gpio_desc *reset_gpio; + struct gpio_desc **reset_gpio; + int nr_gpios; }; 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); + int i; - if (!IS_ERR(pwrseq->reset_gpio)) - gpiod_set_value_cansleep(pwrseq->reset_gpio, 1); + for (i = 0; i < pwrseq->nr_gpios; i++) + if (!IS_ERR(pwrseq->reset_gpio[i])) + gpiod_set_value_cansleep(pwrseq->reset_gpio[i], 1); } 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); + int i; - if (!IS_ERR(pwrseq->reset_gpio)) - gpiod_set_value_cansleep(pwrseq->reset_gpio, 0); + for (i = 0; i < pwrseq->nr_gpios; i++) + if (!IS_ERR(pwrseq->reset_gpio[i])) + gpiod_set_value_cansleep(pwrseq->reset_gpio[i], 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); + if (pwrseq->nr_gpios > 0) { + for (i = 0; i < pwrseq->nr_gpios; i++) + if (!IS_ERR(pwrseq->reset_gpio[i])) + gpiod_put(pwrseq->reset_gpio[i]); + kfree(pwrseq->reset_gpio); + } kfree(pwrseq); host->pwrseq = NULL; @@ -63,17 +74,27 @@ int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev) { struct mmc_pwrseq_simple *pwrseq; int ret = 0; + int i; pwrseq = kzalloc(sizeof(struct mmc_pwrseq_simple), 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; + pwrseq->nr_gpios = of_gpio_named_count(dev->of_node, "reset-gpios"); + if (pwrseq->nr_gpios > 0) { + pwrseq->reset_gpio = kzalloc(sizeof(struct gpio_desc *) * + pwrseq->nr_gpios, GFP_KERNEL); + + for (i = 0; i < pwrseq->nr_gpios; i++) { + pwrseq->reset_gpio[i] = gpiod_get_index(dev, "reset", i, + GPIOD_OUT_HIGH); + if (IS_ERR(pwrseq->reset_gpio[i]) && + PTR_ERR(pwrseq->reset_gpio[i]) != -ENOENT && + PTR_ERR(pwrseq->reset_gpio[i]) != -ENOSYS) { + ret = PTR_ERR(pwrseq->reset_gpio[i]); + goto free; + } + } } pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops; @@ -81,6 +102,13 @@ int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev) return 0; free: + if (pwrseq->nr_gpios > 0) { + for (i = 0; i < pwrseq->nr_gpios; i++) + if (!IS_ERR_OR_NULL(pwrseq->reset_gpio[i])) + gpiod_put(pwrseq->reset_gpio[i]); + kfree(pwrseq->reset_gpio); + } + kfree(pwrseq); return ret; }