[PATCH v2 1/1] mmc: consider cd-gpios in Synopsys DesignWare driver

[Heinrich Schuchardt]

The JH7110 SoC uses a GPIO for card detect.

* In the of_to_plat function check if a cd-gpios definition exists and
  request the GPIO.
* In the getcd function return the GPIO value in this case.

Reported-by: Conor Dooley <conor.doo...@microchip.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com>
---
v2:
        Check that DM_GPIO is enabled to avoid build failure
        on ARC platforms
---
 drivers/mmc/snps_dw_mmc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mmc/snps_dw_mmc.c b/drivers/mmc/snps_dw_mmc.c
index 9bdbe5070b1..aef05cb932f 100644
--- a/drivers/mmc/snps_dw_mmc.c
+++ b/drivers/mmc/snps_dw_mmc.c
@@ -12,6 +12,7 @@
 #include <dwmmc.h>
 #include <errno.h>
 #include <fdtdec.h>
+#include <asm/gpio.h>
 #include <dm/device_compat.h>
 #include <linux/libfdt.h>
 #include <linux/err.h>
@@ -29,6 +30,7 @@ struct snps_dwmci_plat {
 struct snps_dwmci_priv_data {
        struct dwmci_host       host;
        u32                     f_max;
+       struct gpio_desc        cd_gpio;
 };
 
 static int snps_dwmmc_clk_setup(struct udevice *dev)
@@ -106,6 +108,10 @@ static int snps_dwmmc_of_to_plat(struct udevice *dev)
        if (!ret && priv->f_max < CLOCK_MIN)
                return -EINVAL;
 
+       if (CONFIG_IS_ENABLED(DM_GPIO))
+               gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio,
+                                    GPIOD_IS_IN);
+
        host->fifo_mode = dev_read_bool(dev, "fifo-mode");
        host->name = dev->name;
        host->dev_index = 0;
@@ -119,6 +125,9 @@ int snps_dwmmc_getcd(struct udevice *dev)
        struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
        struct dwmci_host *host = &priv->host;
 
+       if (CONFIG_IS_ENABLED(DM_GPIO) && dm_gpio_is_valid(&priv->cd_gpio))
+               return dm_gpio_get_value(&priv->cd_gpio);
+
        return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
 }
 
-- 
2.45.2