[PATCH v3 4/4] doc: usb: ci-hdrc-usb2: Add pinctrl properties for HSIC pin groups

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



For USB HSIC, the data and strobe pin needs to be pulled down
at default, we consider it as "idle" state. When the USB host
is ready to be used, the strobe pin needs to be pulled up,
we consider it as "active" state.

Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
---
 Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
index 529e51879fb2..1e5e7ddfb1a5 100644
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
@@ -80,7 +80,10 @@ Optional properties:
   controller. It's expected that a mux state of 0 indicates device mode and a
   mux state of 1 indicates host mode.
 - mux-control-names: Shall be "usb_switch" if mux-controls is specified.
-- pinctrl-names: Names for optional pin modes in "default", "host", "device"
+- pinctrl-names: Names for optional pin modes in "default", "host", "device".
+  In case of HSIC-mode, "idle" and "active" pin modes are mandatory. In this
+  case, the "idle" state needs to pull down the data and strobe pin
+  and the "active" state needs to pull up the strobe pin.
 - pinctrl-n: alternate pin modes
 
 i.mx specific properties
@@ -110,4 +113,7 @@ Example:
 		phy-clkgate-delay-us = <400>;
 		mux-controls = <&usb_switch>;
 		mux-control-names = "usb_switch";
+		pinctrl-names = "idle", "active";
+		pinctrl-0 = <&pinctrl_usbh2_1>;
+		pinctrl-1 = <&pinctrl_usbh2_2>;
 	};
-- 
2.14.1





[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux