mmc: mmc_spi: Support CD/RO GPIOs

Add support for passing CD/RO GPIO numbers directly to the mmc_spi
driver instead of relying solely on board code callbacks to retrieve the
CD/RO signals values. The driver will enable debouncing on the card
detect GPIO if the cd_debounce field is set to a non-zero value.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/spi/mmc_spi.h b/include/linux/spi/mmc_spi.h
index 32be8dbdf191..87cdb35bedda 100644
--- a/include/linux/spi/mmc_spi.h
+++ b/include/linux/spi/mmc_spi.h
@@ -7,6 +7,11 @@
 struct device;
 struct mmc_host;
 
+#define MMC_SPI_USE_CD_GPIO                     (1 << 0)
+#define MMC_SPI_USE_RO_GPIO                     (1 << 1)
+#define MMC_SPI_CD_GPIO_ACTIVE_LOW              (1 << 2)
+#define MMC_SPI_RO_GPIO_ACTIVE_LOW              (1 << 3)
+
 /* Put this in platform_data of a device being used to manage an MMC/SD
  * card slot.  (Modeled after PXA mmc glue; see that for usage examples.)
  *
@@ -30,8 +35,19 @@ struct mmc_spi_platform_data {
          */
         int (*get_cd)(struct device *);
 
+        /*
+         * Card Detect and Read Only GPIOs. To enable debouncing on the card
+         * detect GPIO, set the cd_debounce to the debounce time in
+         * microseconds.
+         */
+        unsigned int flags;
+        unsigned int cd_gpio;
+        unsigned int cd_debounce;
+        unsigned int ro_gpio;
+
         /* Capabilities to pass into mmc core (e.g. MMC_CAP_NEEDS_POLL). */
         unsigned long caps;
+        unsigned long caps2;
 
         /* how long to debounce card detect, in msecs */
         u16 detect_delay;