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Commit 78f8a0fa authored by Chunfeng Yun's avatar Chunfeng Yun Committed by Greg Kroah-Hartman
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dt-bindings: mt8173-xhci: support host side of dual-role mode 



Some resources, such as IPPC register etc, shared with device
driver are moved into common glue layer when xHCI driver is the
host side of dual-role mode and they should be changed as optional
properties if they are required ones before. For clarity, add
a new part of binding to support host side of dual-role mode.

Additionally add optional properties of pinctrl for host only mode

Signed-off-by: default avatarChunfeng Yun <chunfeng.yun@mediatek.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6c21caa3

Documentation/devicetree/bindings/usb/mt8173-xhci.txt

+52 −2
Original line number Diff line number Diff line
@@ -2,10 +2,18 @@ MT8173 xHCI 


The device node for Mediatek SOC USB3.0 host controller



There are two scenarios: the first one only supports xHCI driver;

the second one supports dual-role mode, and the host is based on xHCI

driver. Take account of backward compatibility, we divide bindings

into two parts.



1st: only supports xHCI driver

------------------------------------------------------------------------



Required properties:

 - compatible : should contain "mediatek,mt8173-xhci"

 - reg : specifies physical base address and size of the registers,

	the first one for MAC, the second for IPPC

 - reg : specifies physical base address and size of the registers

 - reg-names: should be "mac" for xHCI MAC and "ippc" for IP port control

 - interrupts : interrupt used by the controller

 - power-domains : a phandle to USB power domain node to control USB's

	mtcmos
@@ -27,12 +35,16 @@ Optional properties: 
	control register, it depends on "mediatek,wakeup-src".

 - vbus-supply : reference to the VBUS regulator;

 - usb3-lpm-capable : supports USB3.0 LPM

 - pinctrl-names : a pinctrl state named "default" must be defined

 - pinctrl-0 : pin control group

	See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt



Example:

usb30: usb@11270000 {

	compatible = "mediatek,mt8173-xhci";

	reg = <0 0x11270000 0 0x1000>,

	      <0 0x11280700 0 0x0100>;

	reg-names = "mac", "ippc";

	interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_LOW>;

	power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;

	clocks = <&topckgen CLK_TOP_USB30_SEL>,
@@ -49,3 +61,41 @@ usb30: usb@11270000 { 
	mediatek,syscon-wakeup = <&pericfg>;

	mediatek,wakeup-src = <1>;

};



2nd: dual-role mode with xHCI driver

------------------------------------------------------------------------



In the case, xhci is added as subnode to mtu3. An example and the DT binding

details of mtu3 can be found in:

Documentation/devicetree/bindings/usb/mtu3.txt



Required properties:

 - compatible : should contain "mediatek,mt8173-xhci"

 - reg : specifies physical base address and size of the registers

 - reg-names: should be "mac" for xHCI MAC

 - interrupts : interrupt used by the host controller

 - power-domains : a phandle to USB power domain node to control USB's

	mtcmos

 - vusb33-supply : regulator of USB avdd3.3v



 - clocks : a list of phandle + clock-specifier pairs, one for each

	entry in clock-names

 - clock-names : must be

	"sys_ck": for clock of xHCI MAC



Optional properties:

 - vbus-supply : reference to the VBUS regulator;

 - usb3-lpm-capable : supports USB3.0 LPM



Example:

usb30: usb@11270000 {

	compatible = "mediatek,mt8173-xhci";

	reg = <0 0x11270000 0 0x1000>;

	reg-names = "mac";

	interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_LOW>;

	power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;

	clocks = <&topckgen CLK_TOP_USB30_SEL>;

	clock-names = "sys_ck";

	vusb33-supply = <&mt6397_vusb_reg>;

	usb3-lpm-capable;

};