linux-kernel - Re: [PATCH v2 1/4] dt-bindings: media: Add Sony IMX585 CMOS image sensor

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Message-ID: <CAFoNnrxhUof8BBrefm1L1peTxg==Koz72TY+54G_8QUy-rrT8g@mail.gmail.com>
Date: Mon, 11 Aug 2025 23:31:01 -0700
From: Will Whang <will@...lwhang.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, 
	Sakari Ailus <sakari.ailus@...ux.intel.com>, linux-media@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/4] dt-bindings: media: Add Sony IMX585 CMOS image sensor

Hi Krzysztof,

Reply inline,
Thanks,
Will Whang

On Mon, Aug 11, 2025 at 11:23 PM Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On 12/08/2025 04:47, Will Whang wrote:
> > Hi Krzysztof,
> > Reply inline.
> > Thanks,
> > Will Whang
> >
> > On Mon, Aug 11, 2025 at 1:01 AM Krzysztof Kozlowski <krzk@...nel.org> wrote:
> >>
> >> On Sun, Aug 10, 2025 at 11:09:18PM +0100, Will Whang wrote:
> >>> +description:
> >>> +  IMX585 sensor is a Sony CMOS sensor with 4K and FHD outputs.
> >>> +
> >>> +properties:
> >>> +  compatible:
> >>> +    enum:
> >>> +      - sony,imx585
> >>> +      - sony,imx585-mono
> >>
> >> I don't understand this second compatible. Is this different hardware?
> >> Can you point me to "mono" datasheet?
> >>
> >> Your description should explain this. Commit msg as well, instead of
> >> speaking about driver (in fact drop all driver related comments).
> >>
> > Mono version of this sensor is basically just removing the bayer
> > filter, so the sensor itself actually doesn't know if it is color or
> > mono and from my knowledge there are no registers programmed in the
> > factory that will show the variant and model number. (That is why when
> > the driver probing it only test blacklevel register because there are
> > no ID registers)
> > Originally in V1 patch I've made the switch between color and mono in
> > dtoverlay config but reviewer comments is to move it to compatible
> > string and not property.(https://lore.kernel.org/linux-media/20250703175121.GA17709@pendragon.ideasonboard.com/)
>
> You only partially answer and judging by mentioning driver below:
>
>
> >
> > In this case, what would you recommend?
> >
> > compatible:
> >   enum:
> >     - sony,imx585
> >     - sony,imx585-mono
> >   description: IMX585 has two variants, color and mono which the
> > driver supports both.
>
> ... I still have doubts that you really understand what I am asking. Is
> this one device or two different devices?
One device that has two variants: IMX585-AAMJ1 (Mono) and IMX585-AAQJ1
(Color). Silicon-wise the difference is just with or without bayer
filter.
>
>
> Best regards,
> Krzysztof