linux-kernel - Re: [PATCH v5 3/5] media: platform: mediatek: isp

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Message-ID: <CAEHHSvYqT5-s57FijOf+SfLYF4znjaseazxiY-07jVHs09iK6Q@mail.gmail.com>
Date: Mon, 29 Jul 2024 14:46:29 +0200
From: Julien Stephan <jstephan@...libre.com>
To: CK Hu (胡俊光) <ck.hu@...iatek.com>
Cc: "mchehab@...nel.org" <mchehab@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>, 
	"robh@...nel.org" <robh@...nel.org>, Andy Hsieh (謝智皓) <Andy.Hsieh@...iatek.com>, 
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>, 
	"laurent.pinchart@...asonboard.com" <laurent.pinchart@...asonboard.com>, 
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>, 
	"angelogioacchino.delregno@...labora.com" <angelogioacchino.delregno@...labora.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>, 
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>, 
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, 
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, 
	Louis Kuo (郭德寧) <louis.kuo@...iatek.com>, 
	"fsylvestre@...libre.com" <fsylvestre@...libre.com>, "pnguyen@...libre.com" <pnguyen@...libre.com>
Subject: Re: [PATCH v5 3/5] media: platform: mediatek: isp_30: add mediatek
 ISP3.0 sensor interface

Le jeu. 18 juil. 2024 à 04:44, CK Hu (胡俊光) <ck.hu@...iatek.com> a écrit :
>
> Hi, Julien:
>
> On Thu, 2024-07-04 at 15:36 +0200, Julien Stephan wrote:
> >
> > External email : Please do not click links or open attachments until you have verified the sender or the content.
> >  From: Louis Kuo <louis.kuo@...iatek.com>
> >
> > This will add the mediatek ISP3.0 seninf (sensor interface) driver found
> > on several Mediatek SoCs such as the mt8365.
> >
> > Then seninf module has 4 physical CSI-2 inputs. Depending on the soc they
> > may not be all connected.
> >
> > Signed-off-by: Louis Kuo <louis.kuo@...iatek.com>
> > Signed-off-by: Phi-bang Nguyen <pnguyen@...libre.com>
> > Signed-off-by: Florian Sylvestre <fsylvestre@...libre.com>
> > Co-developed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Co-developed-by: Julien Stephan <jstephan@...libre.com>
> > Signed-off-by: Julien Stephan <jstephan@...libre.com>
> > ---
>
> [snip]
>
> > +static const struct mtk_seninf_conf seninf_8365_conf = {
> > +.model = "mtk-camsys-3.0",
> > +.nb_inputs = 4,
> > +.nb_muxes = 6,
> > +.nb_outputs = 4,
> > +};
> > +
>
> I think you should directly define these value as symbols because now
> only support one SoC.
>
> #define MODEL     "mtk-camsys-3.0"
> #define INPUT_NR  4
> #define MUTEX_NR  6
> #define OUTPUT_NR 4
>
> Because we don't know which SoC would be upstream later, maybe the next
> SoC would be
>
> static const struct mtk_seninf_conf seninf_83xx_conf = {
>         .model = "mtk-camsys-3.0",
>         .nb_inputs = 4,
>         .nb_muxes = 6,
>         .nb_outputs = 4,
>         .support_xxx = true;
> };
>
> then model, nb_inputs, nb_muxes, and nb_outputs has no difference, so
> it's not necessary to define them as variable. So define them as
> constant now, and when next SoC upstream, then we know which one would
> be variable.
>

Hi CK,

Thank you for your feedback on this series.
We already discussed this in an early version of the series (see
https://lore.kernel.org/all/2dd412f0-86cb-3ae0-305d-0e8192b9128a@collabora.com/).
I also discussed with internal teams in Mediatek about the folder
architecture. If this is not a red flag for you, I 'll let it as is.

I will fix other comments you did and that I forgot to add in previous versions.

Cheers
Julien

> Regards,
> CK
>
>
>
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