linux-kernel - Re: [PATCH v3 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

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Date:   Fri, 7 Oct 2022 08:58:05 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     allen.chen@....com.tw
Cc:     Jau-Chih.Tseng@....com.tw, Kenneth.Hung@....com.tw,
        Hermes.Wu@....com.tw, treapking@...omium.org,
        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, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: it6505: add properties to restrict
 output bandwidth

On 07/10/2022 05:18, allen.chen@....com.tw wrote:
> hi
> 
> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> 
> Sent: Thursday, October 6, 2022 4:17 PM
> To: Allen Chen (陳柏宇) <allen.chen@....com.tw>
> Cc: Jau-Chih Tseng (曾昭智) <Jau-Chih.Tseng@....com.tw>; Kenneth Hung (洪家倫) <Kenneth.Hung@....com.tw>; Hermes Wu (吳佳宏) <Hermes.Wu@....com.tw>; Pin-yen Lin <treapking@...omium.org>; 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>; Rob Herring <robh+dt@...nel.org>; 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 v3 1/2] dt-bindings: it6505: add properties to restrict output bandwidth
> 
> On 06/10/2022 04:04, 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          | 12 ++++++++++++
>>  1 file changed, 12 insertions(+)
>>
>> diff --git 
>> a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml 
>> b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> index 833d11b2303a..f5482a614d05 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> @@ -52,6 +52,16 @@ properties:
>>      maxItems: 1
>>      description: extcon specifier for the Power Delivery
>>  
>> +  ite,dp-output-data-lane-count:
>> +    description: restrict the dp output data-lanes with value of 1-4
> 
> Drop "with value of 1-4" because it is redundant, but instead explain what this property is about. "Restrict output" is not yet enough.
> Restrict the number? Or choose specific lanes? Why it cannot be data-lanes from video-interfaces?
> 
> ==> DP output bandwidth depends on data-lane-count, so the number of output data-lane-count will restrict output bandwidth.
> In this dt-binding we don't have output endpoint, so use another property name to configure.
> If need to use data-lanes, where can we put in this dt-binding?

I see you got review in v2 to rename it, but it still should be the same
property, if it has similar/same meaning. It can be put here. You just
need to define its type or reference other schema (e.g. video-interfaces
if applicable) which defines it.

Best regards,
Krzysztof