Commit b817959b authored by Aswath Govindraju's avatar Aswath Govindraju Committed by Peng Fan
Browse files

doc: usage: mmc: Document usage of speed mode in "mmc dev" and "mmc rescan"



Add documentation on the usage of "mmc dev" and "mmc rescan" commands to
set user defined speed modes.
Signed-off-by: default avatarAswath Govindraju <a-govindraju@ti.com>
parent 19f7a34a
......@@ -12,9 +12,9 @@ Synopsis
mmc read addr blk# cnt
mmc write addr blk# cnt
mmc erase blk# cnt
mmc rescan
mmc rescan [mode]
mmc part
mmc dev [dev] [part]
mmc dev [dev] [part] [mode]
mmc list
mmc wp
mmc bootbus <dev> <boot_bus_width> <reset_boot_bus_width> <boot_mode>
......@@ -49,6 +49,27 @@ The 'mmc erase' command erases *cnt* blocks on the MMC device starting at block
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
A speed mode can be set only if it has already been enabled in the device tree
The 'mmc part' command displays the list available partition on current mmc device.
The 'mmc dev' command shows or set current mmc device.
......@@ -58,6 +79,27 @@ The 'mmc dev' command shows or set current mmc device.
part
partition number to change
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
A speed mode can be set only if it has already been enabled in the device tree
The 'mmc list' command displays the list available devices.
The 'mmc wp' command enables "power on write protect" function for boot partitions.
......@@ -194,6 +236,9 @@ The current device can be shown or set via 'mmc dev' command:
=> mmc dev 2 0
switch to partitions #0, OK
mmc2 is current device
=> mmc dev 0 1 4
switch to partitions #1, OK
mmc0(part 1) is current device
The list of available devices can be shown via 'mmc list' command:
::
......
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