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[2/2] doc: device-tree-bindings: phy: usb-nop-xceiv

Message ID 20210307185829.97583-3-grandpaul@gmail.com
State New
Headers show
Series drivers: usb: phy: add driver for usb-nop-xceiv | expand

Commit Message

Ying-Chun Liu March 7, 2021, 6:58 p.m. UTC 
From: "Ying-Chun Liu (PaulLiu)" <paul.liu@linaro.org>


Document the bindings for usb-nop-xceiv

Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>

---
 .../phy/usb-nop-xceiv.txt                     | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 doc/device-tree-bindings/phy/usb-nop-xceiv.txt

-- 
2.30.1
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Patch

diff --git a/doc/device-tree-bindings/phy/usb-nop-xceiv.txt b/doc/device-tree-bindings/phy/usb-nop-xceiv.txt
new file mode 100644
index 0000000000..4dc6a8ee30
--- /dev/null
+++ b/doc/device-tree-bindings/phy/usb-nop-xceiv.txt
@@ -0,0 +1,43 @@ 
+USB NOP PHY
+
+Required properties:
+- compatible: should be usb-nop-xceiv
+- #phy-cells: Must be 0
+
+Optional properties:
+- clocks: phandle to the PHY clock. Use as per Documentation/devicetree
+  /bindings/clock/clock-bindings.txt
+  This property is required if clock-frequency is specified.
+
+- clock-names: Should be "main_clk"
+
+- clock-frequency: the clock frequency (in Hz) that the PHY clock must
+  be configured to.
+
+- vcc-supply: phandle to the regulator that provides power to the PHY.
+
+- reset-gpios: Should specify the GPIO for reset.
+
+- vbus-detect-gpio: should specify the GPIO detecting a VBus insertion
+                    (see Documentation/devicetree/bindings/gpio/gpio.txt)
+- vbus-regulator : should specifiy the regulator supplying current drawn from
+  the VBus line (see Documentation/devicetree/bindings/regulator/regulator.txt).
+
+Example:
+
+	hsusb1_phy {
+		compatible = "usb-nop-xceiv";
+		clock-frequency = <19200000>;
+		clocks = <&osc 0>;
+		clock-names = "main_clk";
+		vcc-supply = <&hsusb1_vcc_regulator>;
+		reset-gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;
+		vbus-detect-gpio = <&gpio2 13 GPIO_ACTIVE_HIGH>;
+		vbus-regulator = <&vbus_regulator>;
+		#phy-cells = <0>;
+	};
+
+hsusb1_phy is a NOP USB PHY device that gets its clock from an oscillator
+and expects that clock to be configured to 19.2MHz by the NOP PHY driver.
+hsusb1_vcc_regulator provides power to the PHY and GPIO 7 controls RESET.
+GPIO 13 detects VBus insertion, and accordingly notifies the vbus-regulator.