Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756238Ab2FQKMh (ORCPT ); Sun, 17 Jun 2012 06:12:37 -0400 Received: from mail.work-microwave.de ([62.245.205.51]:47145 "EHLO work-microwave.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754615Ab2FQKMb (ORCPT ); Sun, 17 Jun 2012 06:12:31 -0400 From: Roland Stigge To: cjb@laptop.org, grant.likely@secretlab.ca, rob.herring@calxeda.com, rmk+kernel@arm.linux.org.uk, ulf.hansson@stericsson.com, linus.walleij@linaro.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, aletes.xgr@gmail.com, linux-arm-kernel@lists.infradead.org Cc: Roland Stigge Subject: [PATCH v3 1/2] mmc: mmci.c: Defer probe() in case of yet uninitialized GPIOs Date: Sun, 17 Jun 2012 12:11:32 +0200 Message-Id: <1339927893-8842-2-git-send-email-stigge@antcom.de> X-Mailer: git-send-email 1.7.10 In-Reply-To: <1339927893-8842-1-git-send-email-stigge@antcom.de> References: <1339927893-8842-1-git-send-email-stigge@antcom.de> X-FEAS-SYSTEM-WL: rst@work-microwave.de, 192.168.11.78 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1474 Lines: 41 If the GPIOs used by the MMCI driver are not registered yet when the driver is probe()d, they can't be used. This happens if the mmci driver is probed before the respective GPIO controller (e.g. on the LPC32xx EA3250 board, the PCA9532 GPIO controller would be initialized via DT after mmci). Therefore, we defer mmci in this case. Signed-off-by: Roland Stigge --- drivers/mmc/host/mmci.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- linux-2.6.orig/drivers/mmc/host/mmci.c +++ linux-2.6/drivers/mmc/host/mmci.c @@ -1424,6 +1424,10 @@ static int __devinit mmci_probe(struct a writel(0, host->base + MMCIMASK1); writel(0xfff, host->base + MMCICLEAR); + if (plat->gpio_cd == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto err_gpio_cd; + } if (gpio_is_valid(plat->gpio_cd)) { ret = gpio_request(plat->gpio_cd, DRIVER_NAME " (cd)"); if (ret == 0) @@ -1447,6 +1451,10 @@ static int __devinit mmci_probe(struct a if (ret >= 0) host->gpio_cd_irq = gpio_to_irq(plat->gpio_cd); } + if (plat->gpio_wp == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto err_gpio_wp; + } if (gpio_is_valid(plat->gpio_wp)) { ret = gpio_request(plat->gpio_wp, DRIVER_NAME " (wp)"); if (ret == 0) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/