74 lines
2.4 KiB
Diff
74 lines
2.4 KiB
Diff
|
From f5528e96b7dd2b30e1accc518df85d14baad6bae Mon Sep 17 00:00:00 2001
|
||
|
|
From: Peter Chen <peter.chen@nxp.com>
|
||
|
|
Date: Thu, 18 May 2017 08:48:57 +0800
|
||
|
|
Subject: [PATCH 1/9] binding-doc: power: pwrseq-generic: add binding doc for
|
||
|
|
generic power sequence library
|
||
|
|
|
||
|
|
Add binding doc for generic power sequence library.
|
||
|
|
|
||
|
|
Signed-off-by: Peter Chen <peter.chen@nxp.com>
|
||
|
|
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
|
||
|
|
Acked-by: Rob Herring <robh@kernel.org>
|
||
|
|
---
|
||
|
|
.../bindings/power/pwrseq/pwrseq-generic.txt | 48 +++++++++++++++++++
|
||
|
|
1 file changed, 48 insertions(+)
|
||
|
|
create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
|
||
|
|
|
||
|
|
diff --git a/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
|
||
|
|
new file mode 100644
|
||
|
|
index 000000000000..ebf0d477b688
|
||
|
|
--- /dev/null
|
||
|
|
+++ b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
|
||
|
|
@@ -0,0 +1,48 @@
|
||
|
|
+The generic power sequence library
|
||
|
|
+
|
||
|
|
+Some hard-wired devices (eg USB/MMC) need to do power sequence before
|
||
|
|
+the device can be enumerated on the bus, the typical power sequence
|
||
|
|
+like: enable USB PHY clock, toggle reset pin, etc. But current
|
||
|
|
+Linux device driver lacks of such code to do it, it may cause some
|
||
|
|
+hard-wired devices works abnormal or can't be recognized by
|
||
|
|
+controller at all. The power sequence will be done before this device
|
||
|
|
+can be found at the bus.
|
||
|
|
+
|
||
|
|
+The power sequence properties is under the device node.
|
||
|
|
+
|
||
|
|
+Optional properties:
|
||
|
|
+- clocks: the input clocks for device.
|
||
|
|
+- reset-gpios: Should specify the GPIO for reset.
|
||
|
|
+- reset-duration-us: the duration in microsecond for assert reset signal.
|
||
|
|
+
|
||
|
|
+Below is the example of USB power sequence properties on USB device
|
||
|
|
+nodes which have two level USB hubs.
|
||
|
|
+
|
||
|
|
+&usbotg1 {
|
||
|
|
+ vbus-supply = <®_usb_otg1_vbus>;
|
||
|
|
+ pinctrl-names = "default";
|
||
|
|
+ pinctrl-0 = <&pinctrl_usb_otg1_id>;
|
||
|
|
+ status = "okay";
|
||
|
|
+
|
||
|
|
+ #address-cells = <1>;
|
||
|
|
+ #size-cells = <0>;
|
||
|
|
+ genesys: hub@1 {
|
||
|
|
+ compatible = "usb5e3,608";
|
||
|
|
+ reg = <1>;
|
||
|
|
+
|
||
|
|
+ clocks = <&clks IMX6SX_CLK_CKO>;
|
||
|
|
+ reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>; /* hub reset pin */
|
||
|
|
+ reset-duration-us = <10>;
|
||
|
|
+
|
||
|
|
+ #address-cells = <1>;
|
||
|
|
+ #size-cells = <0>;
|
||
|
|
+ asix: ethernet@1 {
|
||
|
|
+ compatible = "usbb95,1708";
|
||
|
|
+ reg = <1>;
|
||
|
|
+
|
||
|
|
+ clocks = <&clks IMX6SX_CLK_IPG>;
|
||
|
|
+ reset-gpios = <&gpio4 6 GPIO_ACTIVE_LOW>; /* ethernet_rst */
|
||
|
|
+ reset-duration-us = <15>;
|
||
|
|
+ };
|
||
|
|
+ };
|
||
|
|
+};
|
||
|
|
--
|
||
|
|
2.20.1
|
||
|
|
|