[U-Boot] [PATCH v4 2/3] mx6qsabresd: Document the mapping of USDHC[2-4]

[Otavio Salvador]

This documents the SD card identifier so it is easier for user to spot
which card number will be used, if need.

Signed-off-by: Otavio Salvador <otavio at ossystems.com.br>
---
Changes in v4: None
Changes in v3: None
Changes in v2:
- Improve commit log

 board/freescale/mx6qsabresd/mx6qsabresd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/board/freescale/mx6qsabresd/mx6qsabresd.c b/board/freescale/mx6qsabresd/mx6qsabresd.c
index d37f318..61aa4d1 100644
--- a/board/freescale/mx6qsabresd/mx6qsabresd.c
+++ b/board/freescale/mx6qsabresd/mx6qsabresd.c
@@ -26,6 +26,7 @@
 #include <asm/errno.h>
 #include <asm/gpio.h>
 #include <asm/imx-common/iomux-v3.h>
+#include <asm/imx-common/boot_mode.h>
 #include <mmc.h>
 #include <fsl_esdhc.h>
 #include <miiphy.h>
@@ -168,18 +169,21 @@ int board_mmc_init(bd_t *bis)
 
 	for (i = 0; i < CONFIG_SYS_FSL_USDHC_NUM; i++) {
 		switch (i) {
+		/* SD2 - mmc0 */
 		case 0:
 			imx_iomux_v3_setup_multiple_pads(
 				usdhc2_pads, ARRAY_SIZE(usdhc2_pads));
 			gpio_direction_input(USDHC2_CD_GPIO);
 			usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC2_CLK);
 			break;
+		/* SD3 - mmc1 */
 		case 1:
 			imx_iomux_v3_setup_multiple_pads(
 				usdhc3_pads, ARRAY_SIZE(usdhc3_pads));
 			gpio_direction_input(USDHC3_CD_GPIO);
 			usdhc_cfg[1].sdhc_clk = mxc_get_clock(MXC_ESDHC3_CLK);
 			break;
+		/* eMMC - mmc2 */
 		case 2:
 			imx_iomux_v3_setup_multiple_pads(
 				usdhc4_pads, ARRAY_SIZE(usdhc4_pads));
-- 
1.8.1