linux-kernel - Re: [PATCH 2/6] dt-bindings: phy-rockchip-typec: move extcon property to be optional.

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Date:   Thu, 01 Mar 2018 10:49:52 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     kishon@...com, groeck@...omium.org, gwendal@...omium.org,
        kernel@...labora.com, vicencb@...il.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/6] dt-bindings: phy-rockchip-typec: move extcon property to be optional.

Hi Enric,

Am Donnerstag, 1. März 2018, 10:24:16 CET schrieb Enric Balletbo i Serra:
> The extcon property is used to detect the cable-state but some boards,
> like Sapphire, currently does not seem to support, others might just not
> need, as are supposed to work in host-mode only. So, extcon property is
> not really a required property, move to be optional instead.

The change itself is justified, the "justification" in the message might
need some rework, as this sounds more like a kernel-side issue,
while the extcon should always be optional.

Something like:

The extcon property is used to detect the cable-state but some boards
just connect the type-c phy to a regular USB-A connector without any
power-delivery and thus no controller reporting the cable-state.
So the extcon property is not really a required property, move it to be 
optional instead.


For the change itself:
Reviewed-by: Heiko Stuebner <heiko@...ech.de>

> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
> 
>  Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
> b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt index
> 6ea867e3176f..a66f23a01129 100644
> --- a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
> +++ b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
> @@ -14,6 +14,8 @@ Required properties:
>   - resets : a list of phandle + reset specifier pairs
>   - reset-names : string reset name, must be:
>  		 "uphy", "uphy-pipe", "uphy-tcphy"
> +
> +Optional properties:
>   - extcon : extcon specifier for the Power Delivery
> 
>  Note, there are 2 type-c phys for RK3399, and they are almost identical,
> except