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| author | Shawn Lin <shawn.lin@rock-chips.com> | 2018-05-08 04:04:19 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-05-21 11:38:36 +0300 |
| commit | 10a0ed7a945054c2c4951e7a938b5f5498964820 (patch) | |
| tree | 4b7608add3dd0deed9bab8a8112096fc28bf8ddb /Documentation | |
| parent | caeffcf1b26bac57676fbb15df81bff1b79123ea (diff) | |
| download | linux-10a0ed7a945054c2c4951e7a938b5f5498964820.tar.xz | |
Documentation: mmc: addtional description for post-power-on-delay-ms
post-power-on-delay-ms woule be reused to substitute the hard-coded 10ms
delay waiting for power supply to be stable, specificed by individual
platform/board. Default to 10ms as before, if no available.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/mmc.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt index dbe23b12ea1c..f5a0923b34ca 100644 --- a/Documentation/devicetree/bindings/mmc/mmc.txt +++ b/Documentation/devicetree/bindings/mmc/mmc.txt @@ -58,6 +58,10 @@ Optional properties: - fixed-emmc-driver-type: for non-removable eMMC, enforce this driver type. The value <n> is the driver type as specified in the eMMC specification (table 206 in spec version 5.1). +- post-power-on-delay-ms : It was invented for MMC pwrseq-simple which could + be referred to mmc-pwrseq-simple.txt. But now it's reused as a tunable delay + waiting for I/O signalling and card power supply to be stable, regardless of + whether pwrseq-simple is used. Default to 10ms if no available. *NOTE* on CD and WP polarity. To use common for all SD/MMC host controllers line polarity properties, we have to fix the meaning of the "normal" and "inverted" |