linux-kernel - Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

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Message-ID: <CAEXTbpdHkd3KfOkwLt63QhHheqEJuWyRLWiNzD1i4a1rbUabnQ@mail.gmail.com>
Date:   Thu, 27 Oct 2022 11:02:00 +0800
From:   Pin-yen Lin <treapking@...omium.org>
To:     allen.chen@....com.tw
Cc:     robh@...nel.org, Jau-Chih.Tseng@....com.tw, Hermes.Wu@....com.tw,
        Kenneth.Hung@....com.tw, andrzej.hajda@...el.com,
        narmstrong@...libre.com, robert.foss@...aro.org,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...il.com, airlied@...ux.ie, daniel@...ll.ch,
        krzysztof.kozlowski+dt@...aro.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict
 output bandwidth

Hi Allen,

On Thu, Oct 27, 2022 at 9:09 AM <allen.chen@....com.tw> wrote:
>
> Hi rob
>
> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: Tuesday, October 25, 2022 12:38 AM
> To: Allen Chen (陳柏宇) <allen.chen@....com.tw>
> Cc: Pin-Yen Lin <treapking@...omium.org>; Jau-Chih Tseng (曾昭智) <Jau-Chih.Tseng@....com.tw>; Hermes Wu (吳佳宏) <Hermes.Wu@....com.tw>; Kenneth Hung (洪家倫) <Kenneth.Hung@....com.tw>; Andrzej Hajda <andrzej.hajda@...el.com>; Neil Armstrong <narmstrong@...libre.com>; Robert Foss <robert.foss@...aro.org>; Laurent Pinchart <Laurent.pinchart@...asonboard.com>; Jonas Karlman <jonas@...boo.se>; Jernej Skrabec <jernej.skrabec@...il.com>; David Airlie <airlied@...ux.ie>; Daniel Vetter <daniel@...ll.ch>; Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>; open list:DRM DRIVERS <dri-devel@...ts.freedesktop.org>; open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS <devicetree@...r.kernel.org>; open list <linux-kernel@...r.kernel.org>
> Subject: Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth
>
> On Wed, Oct 19, 2022 at 05:32:13PM +0800, allen wrote:
> > From: allen chen <allen.chen@....com.tw>
> >
> > Add properties to restrict dp output data-lanes and clock.
> >
> > Signed-off-by: Pin-Yen Lin <treapking@...omium.org>
> > Signed-off-by: Allen Chen <allen.chen@....com.tw>
> > ---
> >  .../bindings/display/bridge/ite,it6505.yaml   | 89 +++++++++++++++++--
> >  1 file changed, 83 insertions(+), 6 deletions(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > index 833d11b2303a7..8e607b6929fc9 100644
> > --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > @@ -52,9 +52,70 @@ properties:
> >      maxItems: 1
> >      description: extcon specifier for the Power Delivery
> >
> > -  port:
> > -    $ref: /schemas/graph.yaml#/properties/port
> > -    description: A port node pointing to DPI host port node
>
> No existing users you are breaking? The commit msg should explain.
>
> ==> There are no it6505 users in community.

I would say, currently there are no "upstream" users. So, no existing
users to break.

The term "community" is a bit vague and broad.

Regards,
Pin-yen

> > +  ports:
> > +    $ref: /schemas/graph.yaml#/properties/ports
> > +
> > +    properties:
> > +      port@0:
> > +        $ref: /schemas/graph.yaml#/$defs/port-base
> > +        unevaluatedProperties: false
> > +        description: A port node pointing to DPI host port node
> > +
> > +        properties:
> > +          endpoint:
> > +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> > +            unevaluatedProperties: false
> > +
> > +            properties:
> > +              link-frequencies:
> > +                minItems: 1
> > +                maxItems: 1
> > +                description: Allowed max link frequencies in Hz
> > +
> > +      port@1:
> > +        $ref: /schemas/graph.yaml#/$defs/port-base
> > +        unevaluatedProperties: false
> > +        description: Video port for DP output
> > +
> > +        properties:
> > +          endpoint:
> > +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> > +            unevaluatedProperties: false
> > +
> > +            properties:
> > +              data-lanes:
> > +                oneOf:
> > +                  - minItems: 1
> > +                    maxItems: 1
> > +                    uniqueItems: true
> > +                    items:
> > +                      enum:
> > +                        - 0
> > +                        - 1
> > +                    description: For one lane operation.
> > +
> > +                  - minItems: 2
> > +                    maxItems: 2
> > +                    uniqueItems: true
> > +                    items:
> > +                      enum:
> > +                        - 0
> > +                        - 1
> > +                    description: For two lanes operation.
> > +
> > +                  - minItems: 4
> > +                    maxItems: 4
> > +                    uniqueItems: true
> > +                    items:
> > +                      enum:
> > +                        - 0
> > +                        - 1
> > +                        - 2
> > +                        - 3
> > +                    description: For four lanes operation.
>
> I would do just:
>
> data-lanes:
>   minItems: 1
>   items:
>     - enum: [ 0, 1 ]
>     - const: 1
>     - const: 2
>     - const: 3
>
> It does allow 3 lanes, but I don't think that's a big deal. What it does doesn't allow is any order and yours does.
>
> Rob