linux-kernel - Re: [PATCH v2,1/5] dt-bindings: mt8173-xhci: support host side of dual-role mode

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Date:	Tue, 31 May 2016 14:07:48 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Chunfeng Yun <chunfeng.yun@...iatek.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Pawel Moll <pawel.moll@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2,1/5] dt-bindings: mt8173-xhci: support host side of
 dual-role mode

Hello.

On 5/31/2016 8:52 AM, Chunfeng Yun wrote:

> 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@...iatek.com>
> ---
>  .../devicetree/bindings/usb/mt8173-xhci.txt        |   48 ++++++++++++++++++++
>  1 file changed, 48 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/usb/mt8173-xhci.txt b/Documentation/devicetree/bindings/usb/mt8173-xhci.txt
> index b3a7ffa..542e3fa 100644
> --- a/Documentation/devicetree/bindings/usb/mt8173-xhci.txt
> +++ b/Documentation/devicetree/bindings/usb/mt8173-xhci.txt
> @@ -2,6 +2,14 @@ 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,
> @@ -27,6 +35,9 @@ Optional properties:
>  	control register, it depends on "mediatek,wakeup-src".
>   - vbus-supply : reference to the VBUS regulator;
>   - usb3-lpm-capable : supports USB3.0 LPM
> + - pinctl-names : a pinctrl state named "default" must be defined

    pinctrl-names.

> + - pinctrl-0 : pin control group
> +	See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
>
>  Example:
>  usb30: usb@...70000 {
[...]

MBR, Sergei