linux-kernel - Re: [PATCH V8 7/7] dt-bindings: bridge: samsung-dsim: Make some flags optional

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Date:   Fri, 26 May 2023 20:30:03 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Adam Ford <aford173@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, aford@...conembedded.com,
        Inki Dae <inki.dae@...sung.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V8 7/7] dt-bindings: bridge: samsung-dsim: Make some
 flags optional

On Fri, May 26, 2023 at 02:24:21PM -0500, Adam Ford wrote:
> On Fri, May 26, 2023 at 1:19 PM Conor Dooley <conor@...nel.org> wrote:
> > On Thu, May 25, 2023 at 10:05:59PM -0500, Adam Ford wrote:

> > >      description:
> > > -      DSIM high speed burst mode frequency.
> > > +      DSIM high speed burst mode frequency when connected to devices
> > > +      that support burst mode. If absent, the driver will use the pixel
> > > +      clock from the attached device or bridge.
> >
> > I'd rather this description did not say anything about drivers.
> > How about:
> >         If absent, the pixel clock from the attached device or bridge
> >         will be used instead.
> 
> That makes sense.  I can do that.
> 
> "DSIM high speed burst mode frequency (optional). If absent, the pixel
> clock from the attached device or bridge will be used instead."
> 
> > Or perhaps "must be used"? Ditto below.
> 
> "Must be" implies to me that the user needs to set something.  Are you
> ok with the proposed suggestion above?
> >
> > Description aside, the removal seems to be backwards compatible - but
> > can every device that this binding supports work using an "attached
> > device or bridge", or are these properties going to be required for
> > certain compatibles?
> 
> From what I can tell, the assumption is that the DSIM driver was
> expecting it to attach to panels in the past.  With the additional
> patch series, the DSIM can attach to bridge parts without a hard-coded
> set of clocks.  I don't expect the existing Exynos devices to change,
> but I also don't know what would preclude those SoC's from attaching
> to a bridge should someone want to design a new product around them.

Okay, that seems fair. With your revised wording,
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

> 
> I'll wait a couple days for more feedback and send patch V2 with just
> this patch since the rest of the series has been applied to the drm
> branch.

Sounds good. Krzysztof will hopefully be able to take a look then too to
make sure I am not making a hames of things.

Thanks,
Conor.


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