linux-kernel - Re: [RFC PATCH 02/16] dt-bindings: display: rockchip: Add EBC binding

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Message-ID: <20220415134552.182b49a9@aktux>
Date:   Fri, 15 Apr 2022 13:45:52 +0200
From:   Andreas Kemnade <andreas@...nade.info>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Heiko Stübner <heiko@...ech.de>,
        Sandy Huang <hjc@...k-chips.com>,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org,
        Alistair Francis <alistair@...stair23.me>,
        Ondřej Jirman <x@....cz>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Liang Chen <cl@...k-chips.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Michael Riesch <michael.riesch@...fvision.net>,
        Nicolas Frattaroli <frattaroli.nicolas@...il.com>,
        Peter Geis <pgwipeout@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 02/16] dt-bindings: display: rockchip: Add EBC
 binding

On Thu, 14 Apr 2022 22:00:09 -0500
Samuel Holland <samuel@...lland.org> wrote:

> Hi Andreas,
> 
> Thanks for the comments.
> 
> On 4/14/22 3:15 AM, Andreas Kemnade wrote:
> > Hi Samuel,
> > 
> > for comparison, here is my submission for the IMX EPDC bindings:
> > 
> > https://lore.kernel.org/linux-devicetree/20220206080016.796556-2-andreas@kemnade.info/
> > 
> > On Wed, 13 Apr 2022 17:19:02 -0500
> > Samuel Holland <samuel@...lland.org> wrote:
> > 
> > [...]
> > we have sy7636a driver in kernel which should be suitable for powering a EPD
> > and temperature measurement. So I would expect that to be   
> >> +  io-channels:
> >> +    maxItems: 1
> >> +    description: I/O channel for panel temperature measurement
> >> +  
> > so how would I reference the hwmon/thermal(-zone) of the sy7636a here?  
> 
> It seems the consensus is to use a thermal zone for panel temperature, so I will
> need to change this.
> 
I am open to anything here as long as it fits together.

> I think it's best to reference the thermal zone by phandle, not by name, even if
> it requires extending the thermal zone API to support this.
> 
maybe referencing the hwmon might be interesting, or we add a hwmon_iio
adaptor. The other way round it is there. The thermal zone stuff is
only needed because hwmon cannot referenced directly.

Regards,
Andreas