mmc: mxcmmc: use slot-gpio API for write-protect detection

slot-gpio API suppors read-only detection when "wp-gpios"
property is present in the device tree mmc node. Use this
API for write-protect detection.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c
index 3f8d3394197c..df28ebf7e240 100644
--- a/drivers/mmc/host/mxcmmc.c
+++ b/drivers/mmc/host/mxcmmc.c
@@ -38,6 +38,7 @@
 #include <linux/of_device.h>
 #include <linux/of_dma.h>
 #include <linux/of_gpio.h>
+#include <linux/mmc/slot-gpio.h>
 
 #include <asm/dma.h>
 #include <asm/irq.h>
@@ -917,10 +918,11 @@ static int mxcmci_get_ro(struct mmc_host *mmc)
         if (host->pdata && host->pdata->get_ro)
                 return !!host->pdata->get_ro(mmc_dev(mmc));
         /*
-         * Board doesn't support read only detection; let the mmc core
-         * decide what to do.
+         * If board doesn't support read only detection (no mmc_gpio
+         * context or gpio is invalid), then let the mmc core decide
+         * what to do.
          */
-        return -ENOSYS;
+        return mmc_gpio_get_ro(mmc);
 }
 
 static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable)