linux-kernel - Re: [PATCH 1/2] dt-bindings: usb: add DT binding for s3c2410 USB device controller

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Date:   Tue, 13 Dec 2016 12:59:15 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sergio Prado <sergio.prado@...abworks.com>
Cc:     gregkh@...uxfoundation.org, mark.rutland@....com, balbi@...nel.org,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: usb: add DT binding for s3c2410 USB
 device controller

On Fri, Dec 09, 2016 at 05:06:39PM -0200, Sergio Prado wrote:
> Adds the device tree bindings description for Samsung S3C2410 and
> compatible USB device controller.
> 
> Signed-off-by: Sergio Prado <sergio.prado@...abworks.com>
> ---
>  .../devicetree/bindings/usb/s3c2410-usb.txt        | 28 ++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/s3c2410-usb.txt b/Documentation/devicetree/bindings/usb/s3c2410-usb.txt
> index e45b38ce2986..4d3f9894c2d4 100644
> --- a/Documentation/devicetree/bindings/usb/s3c2410-usb.txt
> +++ b/Documentation/devicetree/bindings/usb/s3c2410-usb.txt
> @@ -20,3 +20,31 @@ usb0: ohci@...00000 {
>  	clocks = <&clocks UCLK>, <&clocks HCLK_USBH>;
>  	clock-names = "usb-bus-host", "usb-host";
>  };
> +
> +Samsung S3C2410 and compatible USB device controller
> +
> +Required properties:
> + - compatible: Should be one of the following
> +	       "samsung,s3c2410-udc"
> +	       "samsung,s3c2440-udc"
> + - reg: address and length of the controller memory mapped region
> + - interrupts: interrupt number for the USB device controller
> + - clocks: Should reference the bus and host clocks
> + - clock-names: Should contain two strings
> +		"usb-bus-gadget" for the USB bus clock

Pretty sure the h/w clock name in the datasheet does not use the Linux 
term gadget.

> +		"usb-device" for the USB device clock
> +
> +Optional properties:
> + - samsung,vbus-gpio: If present, specifies a gpio that needs to be
> +   activated for the bus to be powered.

Isn't it the host side that controls Vbus?

> + - samsung,pullup-gpio: If present, specifies a gpio to control the

Both GPIOs need to specify the active state.

> +   USB D+ pullup.
> +
> +usb1: udc@...00000 {
> +	compatible = "samsung,s3c2440-udc";
> +	reg = <0x52000000 0x100000>;
> +	interrupts = <0 0 25 3>;
> +	clocks = <&clocks UCLK>, <&clocks HCLK_USBD>;
> +	clock-names = "usb-bus-gadget", "usb-device";
> +	samsung,pullup-gpio = <&gpc 5 GPIO_ACTIVE_HIGH>;
> +};
> -- 
> 1.9.1
>