When defining bits, make sure we always have a reference to the register
they belong to. For now, renaming all bits properly seems too intrusive,
so at least make sure we have proper documentation.

Signed-off-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
---
 drivers/mmc/host/tmio_mmc.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index b161dfadfec25d..e3e96178acaab4 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -81,9 +81,11 @@
 #define TMIO_STAT_CMD_BUSY      BIT(30)
 #define TMIO_STAT_ILL_ACCESS    BIT(31)
 
+/* Definitions for values the CTL_SD_CARD_CLK_CTL register can take */
 #define        CLK_CTL_DIV_MASK        0xff
 #define        CLK_CTL_SCLKEN          BIT(8)
 
+/* Definitions for values the CTL_SD_MEM_CARD_OPT register can take */
 #define CARD_OPT_WIDTH8                BIT(13)
 #define CARD_OPT_WIDTH         BIT(15)
 
-- 
2.11.0

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