linux-kernel - Re: [PATCH 4/4] dt-bindings: phy-rockchip-inno-usb2: add new rockchip,force-bvalid property.

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Message-ID: <20180815222604.GB8193@rob-hp-laptop>
Date:   Wed, 15 Aug 2018 16:26:04 -0600
From:   Rob Herring <robh@...nel.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel@...r.kernel.org, amstan@...omium.org,
        groeck@...gle.com, kieran.bingham@...asonboard.com,
        kernel@...labora.com, bleung@...omium.org, heiko@...ech.de,
        devicetree@...r.kernel.org, Frank Wang <frank.wang@...k-chips.com>,
        linux-rockchip@...ts.infradead.org,
        Kishon Vijay Abraham I <kishon@...com>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/4] dt-bindings: phy-rockchip-inno-usb2: add new
 rockchip,force-bvalid property.

On Wed, Aug 15, 2018 at 11:59:34AM +0200, Enric Balletbo i Serra wrote:
> This property is used when the otg-id pin is not connected. When this
> property is set it forces to set the B-Device Session Valid bit when the
> port works as device and clears that bit when the port works as host.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
> 
>  .../devicetree/bindings/phy/phy-rockchip-inno-usb2.txt       | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
> index 2d4808d3920b..55761f466c41 100644
> --- a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
> +++ b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
> @@ -48,6 +48,11 @@ Optional properties:
>  		See ./phy-bindings.txt for details.
>   - rockchip,utmi-avalid : boolean, use the avalid register to get vbus status.
>  			  Otherwise, use the bvalid register.
> + - rockchip,force-bvalid : boolean, set this to force the B-Device Session
> +			  Valid bit when the usb port is in device mode. This
> +			  is used when the otg-id pin is not connected.
> +			  Only supported in case of compatible being:
> +			  * "rockchip,rk3399-usb2phy"

Shouldn't you describe the property of the h/w that ID pin is not 
connected, rather than what you do with that information.

Is the pin not connected because it's a connector without ID pin? If so, 
that should be a property of the connector (or inferred from the 
connector compatible string).

Rob