linux-kernel - [PATCH v2 1/2] mmc: dw_mmc: exynos: Stop claiming wp-gpio

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Date:	Thu, 22 Nov 2012 14:53:49 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	linux-samsung-soc@...r.kernel.org,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>
Cc:	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Will Newton <will.newton@...tec.com>,
	Chris Ball <cjb@...top.org>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Doug Anderson <dianders@...omium.org>
Subject: [PATCH v2 1/2] mmc: dw_mmc: exynos: Stop claiming wp-gpio

The exynos code claimed wp-gpio with devm_gpio_request() but never did
anything with it.  That meant that anyone using a write protect GPIO
would effectively be write protected all the time.

A future change will move the wp-gpio support to the core dw_mmc.c
file.  Now the exynos-specific code won't claim the GPIO but will
just set the DW_MCI_QUIRK_NO_WRITE_PROTECT quirk if write protect
won't be used.

Signed-off-by: Doug Anderson <dianders@...omium.org>

---
Changes in v2:
- Nothing new in this patch

 drivers/mmc/host/dw_mmc-exynos.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index 4d50da6..58cc03e 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -175,12 +175,12 @@ static int dw_mci_exynos_setup_bus(struct dw_mci *host,
 		}
 	}
 
-	gpio = of_get_named_gpio(slot_np, "wp-gpios", 0);
-	if (gpio_is_valid(gpio)) {
-		if (devm_gpio_request(host->dev, gpio, "dw-mci-wp"))
-			dev_info(host->dev, "gpio [%d] request failed\n",
-						gpio);
-	} else {
+	/*
+	 * If there are no write-protect GPIOs present then we assume no write
+	 * protect.  The mci_readl() in dw_mmc.c won't work since it's not
+	 * hooked up on exynos.
+	 */
+	if (!of_find_property(slot_np, "wp-gpios", NULL)) {
 		dev_info(host->dev, "wp gpio not available");
 		host->pdata->quirks |= DW_MCI_QUIRK_NO_WRITE_PROTECT;
 	}
-- 
1.7.7.3

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