Dear Lothar Wa?mann,

Hi,

Marek Vasut writes:

quoted

The write-protect GPIO is inverted on some boards. Handle such case.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Shawn Guo <redacted>
Cc: Fabio Estevam <redacted>
---

 Documentation/devicetree/bindings/mmc/mxs-mmc.txt |    1 +
 drivers/mmc/host/mxs-mmc.c                        |   11 ++++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mmc/mxs-mmc.txt

b/Documentation/devicetree/bindings/mmc/mxs-mmc.txt index
14d870a..0a7d2cd 100644

--- a/Documentation/devicetree/bindings/mmc/mxs-mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mxs-mmc.txt

@@ -13,6 +13,7 @@ Required properties:
 Optional properties:
 - wp-gpios: Specify GPIOs for write protection

+- wp-inverted: Set if the write protection GPIO is inverted

 Examples:

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 277161d..119beb9 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c

@@ -164,16 +164,23 @@ struct mxs_mmc_host {

 	spinlock_t			lock;
 	int				sdio_irq_en;
 	int				wp_gpio;

+	int				wp_inverted:1;

 };
 
 static int mxs_mmc_get_ro(struct mmc_host *mmc)
 {
 
 	struct mxs_mmc_host *host = mmc_priv(mmc);

+	int ret;

 	if (!gpio_is_valid(host->wp_gpio))
 	
 		return -EINVAL;

-	return gpio_get_value(host->wp_gpio);
+	ret = gpio_get_value(host->wp_gpio);
+
+	if (host->wp_inverted)
+		ret = !ret;
+
+	return ret;

 }
 
 static int mxs_mmc_get_cd(struct mmc_host *mmc)

@@ -786,6 +793,8 @@ static int mxs_mmc_probe(struct platform_device

*pdev)

 		else if (bus_width == 8)
 		
 			mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA;
 		
 		host->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);

+		if (of_find_property(np, "wp-inverted", NULL))
+			host->wp_inverted = 1;

Why not simply specify the GPIO in question as being active-low in the
GPIO definition and use of_get_named_gpio_flags()?

Just followed the cd-inverted pattern. Thanks for the hint, will poke into it.

Lothar Wa?mann

Best regards,
Marek Vasut