diff options
| author | Ulf Hansson <ulf.hansson@linaro.org> | 2017-05-06 11:41:30 +0200 |
|---|---|---|
| committer | Leonard Crestez <leonard.crestez@nxp.com> | 2018-08-24 12:41:33 +0300 |
| commit | 77491cc36e44b67d0936614e4e6acbabd40d3aad (patch) | |
| tree | d94c6bd0d5a7f9c3662367bd09f20431c4326db0 /Documentation/devicetree/bindings/mmc | |
| parent | 81a2e2fd95f3b916766308f296b180271ac98ce6 (diff) | |
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>
(cherry picked from commit c477ebe21fabe0010a2ed324ce3a1762c757d867)
Diffstat (limited to 'Documentation/devicetree/bindings/mmc')
| -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: |