This patch adds the exteral vcc optional for the simple power sequence.
Some WLAN chips attached to a SDIO interface, need an external vcc
to be operational. Since this is very common, extend the simple MMC
power sequence DT binding to support an optional exteral vcc.
Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
---
Changes in v2: None
Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
index ce0e767..fdcc6a1 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
@@ -12,6 +12,7 @@ Optional properties:
at initialization and prior we start the power up procedure of the card.
They will be de-asserted right after the power has been provided to the
card.
+- ext-vcc-supply : Regulator to drive (independent) card VCC.
- clocks : Must contain an entry for the entry in clock-names.
See ../clocks/clock-bindings.txt for details.
- clock-names : Must include the following entry:
@@ -19,9 +20,17 @@ Optional properties:
Example:
+ wifi_regulator: wifi-regulator {
+ compatible = "regulator-fixed";
+ enable-active-high;
+ gpio = <&gpio0 26 GPIO_ACTIVE_HIGH>;
+ regulator-name = "wifi_regulator";
+ };
+
sdhci0_pwrseq {
compatible = "mmc-pwrseq-simple";
reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
+ ext-vcc-supply = <&wifi_regulator>;
clocks = <&clk_32768_ck>;
clock-names = "ext_clock";
}
--
1.9.1
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