mmc: mmc: Add driver strength selection

Add the ability to set eMMC driver strength
for HS200 and HS400.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 4819cfbc3795..15f2c4a0a62c 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -391,6 +391,7 @@ struct _mmc_csd {
 #define EXT_CSD_TIMING_HS       1       /* High speed */
 #define EXT_CSD_TIMING_HS200    2       /* HS200 */
 #define EXT_CSD_TIMING_HS400    3       /* HS400 */
+#define EXT_CSD_DRV_STR_SHIFT   4       /* Driver Strength shift */
 
 #define EXT_CSD_SEC_ER_EN       BIT(0)
 #define EXT_CSD_SEC_BD_BLK_EN   BIT(2)
@@ -442,4 +443,6 @@ struct _mmc_csd {
 #define MMC_SWITCH_MODE_CLEAR_BITS      0x02    /* Clear bits which are 1 in value */
 #define MMC_SWITCH_MODE_WRITE_BYTE      0x03    /* Set target to value */
 
+#define mmc_driver_type_mask(n)         (1 << (n))
+
 #endif /* LINUX_MMC_MMC_H */