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

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Message-ID: <YD0WAMySrv53lxFR@pendragon.ideasonboard.com>
Date:   Mon, 1 Mar 2021 18:27:44 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Parshuram Raju Thombare <pthombar@...ence.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 Parshuram,

On Mon, Mar 01, 2021 at 04:14:54PM +0000, Parshuram Raju Thombare wrote:
> 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.

-- 
Regards,

Laurent Pinchart