linux-kernel - RE: [PATCH v2 1/2] dt-bindings: drm/bridge: MHDP8546 bridge binding changes for HDCP

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Message-ID: <DM5PR07MB319628C858F667D9E5058904C1999@DM5PR07MB3196.namprd07.prod.outlook.com>
Date:   Tue, 2 Mar 2021 12:53:50 +0000
From:   Parshuram Raju Thombare <pthombar@...ence.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     "robert.foss@...aro.org" <robert.foss@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "a.hajda@...sung.com" <a.hajda@...sung.com>,
        "narmstrong@...libre.com" <narmstrong@...libre.com>,
        "nikhil.nd@...com" <nikhil.nd@...com>,
        "kishon@...com" <kishon@...com>,
        Swapnil Kashinath Jakhade <sjakhade@...ence.com>,
        Milind Parab <mparab@...ence.com>
Subject: RE: [PATCH v2 1/2] dt-bindings: drm/bridge: MHDP8546 bridge binding
 changes for HDCP

Hi Laurent,

>> > Is this a property of the hardware, that is, are there multiple versions
>> > of this IP core covered by the same compatible string that support HDCP
>> > 1.4 only, DHCP 2.2 only or both ? Or is it a way to select what a given
>> > system will offer ?[]
>>
>> MHDP hardware supports both HDCP 2.2 and 1.4. So, this is a way
>> to select the version of HDCP, system wish to support.
>
>Then I'm not sure this qualifies as a DT property, which should describe
>the system, not configure it. A way for userspace to configure this
>would be better.

Since this is for source device, I am not sure how useful it is to allow
user to change HDCP version supported. I think doing it in DTS
gives more control over HDCP to system designer/integrator.

Regards,
Parshuram Thombare