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authorUlf Hansson <ulf.hansson@linaro.org>2017-05-06 11:41:30 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2017-05-23 14:17:10 +0200
commitc477ebe21fabe0010a2ed324ce3a1762c757d867 (patch)
tree24432b73b10451cab7d7e8569913ab99e6909763 /Documentation/devicetree
parent08332893e37af6ae779367e78e444f8f9571511d (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>
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r--Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt2
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: