[1/8] mmc: dt: pwrseq-simple: Invent power-off-delay-us

Message ID 1494260477-25163-2-git-send-email-ulf.hansson@linaro.org
State Accepted
Commit c477ebe21fabe0010a2ed324ce3a1762c757d867
Headers show
Series
  • arm64: hi6220-hikey: Fix WiFi support
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Commit Message

Ulf Hansson May 8, 2017, 4:21 p.m.
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>

---
 Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.7.4

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diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
index e254368..9029b45 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: