linux-kernel - Re: [PATCH v2 2/5] usb: DT binding documentation for qoriq usb 2.0 controller

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Message-ID: <20160711064845.GH31647@shlinux2>
Date:	Mon, 11 Jul 2016 14:48:45 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Rajesh Bhagat <rajesh.bhagat@....com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, Peter.Chen@....com,
	gregkh@...uxfoundation.org, kishon@...com, robh+dt@...nel.org,
	shawnguo@...nel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/5] usb: DT binding documentation for qoriq usb 2.0
 controller

On Sat, Jul 09, 2016 at 10:00:53AM +0530, Rajesh Bhagat wrote:
> Describes the qoriq usb 2.0 controller driver binding, currently used
> for LS1021A and LS1012A platform.
> 
> Signed-off-by: Rajesh Bhagat <rajesh.bhagat@....com>
> ---
> Changes in v2: 
>  - Adds DT binding documentation for qoriq usb 2.0 controller
>  - Changed the compatible string to fsl,ci-qoriq-usb2
> 
>  .../devicetree/bindings/usb/ci-hdrc-qoriq.txt      | 34 ++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/ci-hdrc-qoriq.txt
> 
> diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-qoriq.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-qoriq.txt
> new file mode 100644
> index 0000000..8ad7306
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-qoriq.txt
> @@ -0,0 +1,34 @@
> +* Freescale QorIQ SoC USB 2.0 Controllers
> +
> +Required properties:
> +- compatible: Should be "fsl,ci-qoriq-usb2"
> +  Wherever applicable, the IP version of the USB controller should
> +  also be mentioned (for eg. fsl,ci-qoriq-usb2-vX.Y).
> +  where, X.Y is IP version of USB controller.

Why you need to add IP version at compatible string?
Does it can't be read out from ID register of Identification Registers.

> +- reg: Should contain registers location and length
> +- interrupts: Should contain controller interrupt
> +- phy-names: from the *Generic PHY* bindings
> +- phys: from the *Generic PHY* bindings
> +- clocks: clock provider specifier
> +- clock-names: shall be "usb2-clock"
> +Refer to clk/clock-bindings.txt for generic clock consumer properties
> +
> +Recommended properties:
> +- dr_mode: One of "host" or "peripheral".

Do you support dual-role?

> +- phy_type: the type of the phy connected to the core. Should be one
> +  of "utmi", "utmi_wide", "ulpi", "serial" or "hsic". Without this
> +  property the PORTSC register won't be touched
> +
> +Examples:
> +usb@...0000 {
> +	compatible =  "fsl,ci-qoriq-usb2",
> +		      "fsl,ci-qoriq-usb2-v2.5";
> +	reg = <0x0 0x8600000 0x0 0x1000>;
> +	interrupts = <0 139 0x4>;
> +	phy-names = "usb2-phy";
> +	phys = <&usbphy0>;
> +	clock-names = "usb2-clock";
> +	clocks = <&clockgen 4 3>;
> +	dr_mode = "host";
> +	phy_type = "ulpi";
> +};
> -- 
> 2.6.2.198.g614a2ac
> 
> --
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-- 

Best Regards,
Peter Chen