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| author | Ulf Hansson <ulf.hansson@linaro.org> | 2017-05-06 11:41:30 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-05-23 14:17:10 +0200 |
| commit | c477ebe21fabe0010a2ed324ce3a1762c757d867 (patch) | |
| tree | 24432b73b10451cab7d7e8569913ab99e6909763 /Documentation | |
| parent | Linux 4.12-rc2 (diff) | |
| download | linux-c477ebe21fabe0010a2ed324ce3a1762c757d867.tar.xz linux-c477ebe21fabe0010a2ed324ce3a1762c757d867.zip | |
mmc: dt: pwrseq-simple: Invent power-off-delay-us
During power off, after the GPIO pin has been asserted, some devices like
the Wifi chip from TI, Wl18xx, needs a delay before the host continues with
clock gating and turning off regulators as to follow a graceful shutdown
sequence.
Therefore invent an optional power-off-delay-us DT binding for
mmc-pwrseq-simple, to allow us to support this constraint.
Cc: devicetree@vger.kernel.org
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-mmc@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt index e25436861867..9029b45b8a22 100644 --- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt +++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt @@ -18,6 +18,8 @@ Optional properties: "ext_clock" (External clock provided to the card). - post-power-on-delay-ms : Delay in ms after powering the card and de-asserting the reset-gpios (if any) +- power-off-delay-us : Delay in us after asserting the reset-gpios (if any) + during power off of the card. Example: |