linux-kernel - Re: [PATCH v3 1/6] dt-bindings: add binding for USBSS-DRD controller.

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Date:   Wed, 13 Feb 2019 16:48:41 -0600
From:   Rob Herring <robh@...nel.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     devicetree@...r.kernel.org, gregkh@...uxfoundation.org,
        mark.rutland@....com, linux-usb@...r.kernel.org,
        hdegoede@...hat.com, heikki.krogerus@...ux.intel.com,
        andy.shevchenko@...il.com, rogerq@...com,
        linux-kernel@...r.kernel.org, jbergsagel@...com, nsekhar@...com,
        nm@...com, sureshp@...ence.com, peter.chen@....com,
        pjez@...ence.com, kurahul@...ence.com
Subject: Re: [PATCH v3 1/6] dt-bindings: add binding for USBSS-DRD controller.

On Thu, Jan 31, 2019 at 11:52:28AM +0000, Pawel Laszczak wrote:
> This patch aim at documenting USB related dt-bindings for the
> Cadence USBSS-DRD controller.
> 
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> ---
>  .../devicetree/bindings/usb/cdns-usb3.txt     | 33 +++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/cdns-usb3.txt
> 
> diff --git a/Documentation/devicetree/bindings/usb/cdns-usb3.txt b/Documentation/devicetree/bindings/usb/cdns-usb3.txt
> new file mode 100644
> index 000000000000..6dc38be77f5c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/cdns-usb3.txt
> @@ -0,0 +1,33 @@
> +Binding for the Cadence USBSS-DRD controller
> +
> +Required properties:
> +  - reg: Physical base address and size of the controller's register areas.
> +	 Controller has 3 different regions:
> +	 region 1 - HOST registers area
> +	 region 2 - DEVICE registers area
> +	 region 3 - OTG/DRD registers area
> +  - reg-names - register memory area names:
> +	"xhci" - for HOST registers space
> +	"dev" - for DEVICE registers space
> +	"otg" - for OTG/DRD registers space
> +  - compatible: Should contain: "cdns,usb3-1.0.0" or "cdns,usb3-1.0.1"
> +  - interrupts: Interrupt specifier. Refer to interrupt bindings.
> +		Driver supports only single interrupt line.

Driver supports or h/w only has 1 interrupt?

> +                This single interrupt is shared between Device,
> +		host and OTG/DRD part of driver.
> +
> +Optional properties:
> + - maximum-speed : valid arguments are "super-speed", "high-speed" and
> +                   "full-speed"; refer to usb/generic.txt
> + - dr_mode: Should be one of "host", "peripheral" or "otg".
> + - phys: reference to the USB PHY
> +
> +Example:
> +	usb@...00000 {
> +		compatible = "cdns,usb3";

Doesn't match above.

> +		interrupts = <USB_IRQ  7 IRQ_TYPE_LEVEL_HIGH>;
> +		reg = <0xf3000000 0x10000	/* memory area for HOST registers */
> +			0xf3010000 0x10000	/* memory area for DEVICE registers */
> +			0xf3020000 0x10000>;	/* memory area for OTG/DRD registers */

Are these really 64KB long? That wastes virtual address space on 32-bit 
systems if not.

> +		reg-names = "xhci", "dev", "otg";
> +	};
> -- 
> 2.17.1
>