linux-kernel - Re: [PATCH v2 2/5] dt-bindings: Add a binding for Mediatek xHCI host controller

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Date:	Fri, 10 Jul 2015 11:31:03 +0300
From:	Roger Quadros <rogerq@...com>
To:	Chunfeng Yun <chunfeng.yun@...iatek.com>,
	Mathias Nyman <mathias.nyman@...el.com>
CC:	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Felipe Balbi <balbi@...com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2 2/5] dt-bindings: Add a binding for Mediatek xHCI host
 controller

Hi,

On 08/07/15 12:41, Chunfeng Yun wrote:
> add a DT binding documentation of xHCI host controller for the
> MT8173 SoC from Mediatek.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> ---
>  .../devicetree/bindings/usb/mt8173-xhci.txt        | 27 ++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/mt8173-xhci.txt
> 
> diff --git a/Documentation/devicetree/bindings/usb/mt8173-xhci.txt b/Documentation/devicetree/bindings/usb/mt8173-xhci.txt
> new file mode 100644
> index 0000000..94cec94
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/mt8173-xhci.txt
> @@ -0,0 +1,27 @@
> +MT65XX xhci
> +
> +The device node for Mediatek SOC usb3.0 host controller
> +
> +Required properties:
> + - compatible : supports "mediatek,mt8173-xhci"
> + - reg        : Offset and length of registers
> + - interrupts : Interrupt mode, number and trigger mode
> + - reg-vusb33-supply:  regulator of usb avdd3.3v
> + - reg-vbus-supply : regulator of vbus;

General trend is to use <supply-name>-supply.
We already know it is a regulator so no need to add "reg-"

So those two can be

vusb33-supply:
vbus-supply:


> + - usb-phy : the phy that xhci will bind
> + - usb3-lpm-capable: supports USB3 LPM
> + - clocks     : must support all clocks that xhci needs
> + - clock-names: should be "sys_mac" for sys and mac clocks
> +
> +Example:
> +usb: usb30@...70000 {
> +	compatible = "mediatek,mt8173-xhci";
> +	reg = <0 0x11270000 0 0x1000>;
> +	interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_LOW>;
> +	reg-vusb33-supply = <&mt6397_vusb_reg>;
> +	reg-vbus-supply = <&usb_p1_vbus>;
> +	usb-phy = <&u3phy>;
> +	usb3-lpm-capable;
> +	clocks = <&topckgen CLK_TOP_USB30_SEL>;
> +	clock-names = "sys_mac";
> +};
> 

cheers,
-roger
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