linux-kernel - Re: [PATCH v2 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

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Message-ID: <720cc44b-a6fd-5424-1db6-fda1290c23e7@linaro.org>
Date:   Wed, 5 Oct 2022 09:11:11 +0200
From:   neil.armstrong@...aro.org
To:     allen.chen@....com.tw
Cc:     devicetree@...r.kernel.org, Kenneth.Hung@....com.tw,
        jernej.skrabec@...il.com, krzysztof.kozlowski+dt@...aro.org,
        Jau-Chih.Tseng@....com.tw, airlied@...ux.ie,
        dri-devel@...ts.freedesktop.org, narmstrong@...libre.com,
        linux-kernel@...r.kernel.org, robert.foss@...aro.org,
        treapking@...omium.org, Hermes.Wu@....com.tw, robh+dt@...nel.org,
        Laurent.pinchart@...asonboard.com, andrzej.hajda@...el.com,
        jonas@...boo.se
Subject: Re: [PATCH v2 1/2] dt-bindings: it6505: add properties to restrict
 output bandwidth

On 05/10/2022 08:19, allen.chen@....com.tw wrote:
> Hi
> 
> data-lanes is output configuration. Maybe it is not suitable to put data-lanes in input endpoint.
> extcon doesn't have output endpoint, so I don't know where to put is better.

Ok it wasn't clear enough

Then rename the property to something more specific like:
ite,dp-output-data-lane-count

Use the same naming scheme for the other property:
ite,dp-output-max-pixel-clock-khz

Neil

> 
> -----Original Message-----
> From: Neil Armstrong <neil.armstrong@...aro.org>
> Sent: Thursday, September 29, 2022 4:40 PM
> To: Allen Chen (陳柏宇) <allen.chen@....com.tw>
> Cc: open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS <devicetree@...r.kernel.org>; Kenneth Hung (洪家倫) <Kenneth.Hung@....com.tw>; Jernej Skrabec <jernej.skrabec@...il.com>; Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>; Jau-Chih Tseng (曾昭智) <Jau-Chih.Tseng@....com.tw>; David Airlie <airlied@...ux.ie>; open list:DRM DRIVERS <dri-devel@...ts.freedesktop.org>; Neil Armstrong <narmstrong@...libre.com>; open list <linux-kernel@...r.kernel.org>; Robert Foss <robert.foss@...aro.org>; Pin-yen Lin <treapking@...omium.org>; Hermes Wu (吳佳宏) <Hermes.Wu@....com.tw>; Rob Herring <robh+dt@...nel.org>; Laurent Pinchart <Laurent.pinchart@...asonboard.com>; Andrzej Hajda <andrzej.hajda@...el.com>; Jonas Karlman <jonas@...boo.se>
> Subject: Re: [PATCH v2 1/2] dt-bindings: it6505: add properties to restrict output bandwidth
> 
> Hi,
> 
> On 29/09/2022 03:44, 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>
>> ---
>>    .../devicetree/bindings/display/bridge/ite,it6505.yaml | 10 ++++++++++
>>    1 file changed, 10 insertions(+)
>>
>> diff --git
>> a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> index 833d11b2303a..62b9f2192202 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> @@ -52,6 +52,14 @@ properties:
>>        maxItems: 1
>>        description: extcon specifier for the Power Delivery
>>    
>> +  data-lanes:
>> +    maxItems: 1
>> +    description: restrict the dp output data-lanes with value of 1-4
> 
> Can't you use the data-lanes property in the first port endpoint ?
> 
> Look at Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
> 
>> +
>> +  max-pixel-clock-khz:
>> +    maxItems: 1
>> +    description: restrict max pixel clock
> 
> New vendor specific properties should have the ite, prefix.
> 
>> +
>>      port:
>>        $ref: /schemas/graph.yaml#/properties/port
>>        description: A port node pointing to DPI host port node @@ -84,6
>> +92,8 @@ examples:
>>                pwr18-supply = <&it6505_pp18_reg>;
>>                reset-gpios = <&pio 179 1>;
>>                extcon = <&usbc_extcon>;
>> +            data-lanes = <2>;
>> +            max-pixel-clock-khz = <150000>;
>>    
>>                port {
>>                    it6505_in: endpoint {
> 
> Thanks,
> Neil