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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: Chunfeng Yun <chunfeng.yun@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2016-10-19 10:28:20 +08:00 committed by Greg Kroah-Hartman
parent 6c21caa333
commit 78f8a0fae6
1 changed files with 52 additions and 2 deletions
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54
Documentation/devicetree/bindings/usb/mt8173-xhci.txt
View File

@ -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;
};