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| author | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2021-11-05 18:35:44 +0300 |
|---|---|---|
| committer | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2021-11-07 20:36:55 +0300 |
| commit | 212f078496e4b9df0794fd4f56e0ab342b7efbf9 (patch) | |
| tree | f14de7cdabac20b2c03f3ef8f5deefe7714cab34 /doc | |
| parent | a212f5d09c1b2919dbf42b7e4129721691fd54a0 (diff) | |
| download | u-boot-212f078496e4b9df0794fd4f56e0ab342b7efbf9.tar.xz | |
doc: mmc rescan speed mode
Provide human readable descriptions of the speed nodes instead of the name
of constants from the code.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/usage/mmc.rst | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/doc/usage/mmc.rst b/doc/usage/mmc.rst index d15b151884..02b5d7b1c7 100644 --- a/doc/usage/mmc.rst +++ b/doc/usage/mmc.rst @@ -51,22 +51,26 @@ The 'mmc rescan' command scans the available MMC device. mode speed mode to set. - CONFIG_MMC_SPEED_MODE_SET should be enabled. The required speed mode is - passed as the index from the following list. - - 0 - MMC_LEGACY - 1 - MMC_HS - 2 - SD_HS - 3 - MMC_HS_52 - 4 - MMC_DDR_52 - 5 - UHS_SDR12 - 6 - UHS_SDR25 - 7 - UHS_SDR50 - 8 - UHS_DDR50 - 9 - UHS_SDR104 - 10 - MMC_HS_200 - 11 - MMC_HS_400 - 12 - MMC_HS_400_ES + CONFIG_MMC_SPEED_MODE_SET should be enabled. The requested speed mode is + passed as a decimal number according to the following table: + + ========== ========================== + Speed mode Description + ========== ========================== + 0 MMC legacy + 1 MMC High Speed (26MHz) + 2 SD High Speed (50MHz) + 3 MMC High Speed (52MHz) + 4 MMC DDR52 (52MHz) + 5 UHS SDR12 (25MHz) + 6 UHS SDR25 (50MHz) + 7 UHS SDR50 (100MHz) + 8 UHS DDR50 (50MHz) + 9 UHS SDR104 (208MHz) + 10 HS200 (200MHz) + 11 HS400 (200MHz) + 12 HS400ES (200MHz) + ========== ========================== A speed mode can be set only if it has already been enabled in the device tree |