linux-kernel - Re: [PATCH v3 01/17] media: dt-bindings: renesas,rzg2l-csi2: Document Renesas RZ/V2H(P) SoC

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Message-ID: <Z8CQRNz-cX_MuD_y@tom-desktop>
Date: Thu, 27 Feb 2025 17:18:12 +0100
From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: tomm.merciai@...il.com, linux-renesas-soc@...r.kernel.org,
	linux-media@...r.kernel.org, biju.das.jz@...renesas.com,
	prabhakar.mahadev-lad.rj@...renesas.com,
	Rob Herring <robh@...nel.org>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 01/17] media: dt-bindings: renesas,rzg2l-csi2:
 Document Renesas RZ/V2H(P) SoC

Hi Geert,
Thanks for your review.

On Thu, Feb 27, 2025 at 11:33:16AM +0100, Geert Uytterhoeven wrote:
> Hi Tommaso,
> 
> On Wed, 26 Feb 2025 at 16:25, Tommaso Merciai
> <tommaso.merciai.xr@...renesas.com> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > The MIPI CSI-2 block on the Renesas RZ/V2H(P) SoC is similar to the one
> > found on the Renesas RZ/G2L SoC, with the following differences:
> > - A different D-PHY
> > - Additional registers for the MIPI CSI-2 link
> > - Only two clocks
> >
> > Add a new compatible string, `renesas,r9a09g057-csi2`, for the RZ/V2H(P)
> > SoC.
> >
> > Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
> 
> Thanks for your patch!
> 
> > --- a/Documentation/devicetree/bindings/media/renesas,rzg2l-csi2.yaml
> > +++ b/Documentation/devicetree/bindings/media/renesas,rzg2l-csi2.yaml
> 
> > @@ -48,7 +58,8 @@ properties:
> >    resets:
> >      items:
> >        - description: CRU_PRESETN reset terminal
> > -      - description: CRU_CMN_RSTB reset terminal
> > +      - description:
> > +          CRU_CMN_RSTB reset terminal (all but RZ/V2H(P)) or D-PHY reset (RZ/V2H(P))
> 
> According to the flowcharts[1] in the RZ/G2L, RZ/V2L, and RZ/G2UL
> documentation, CPG_RST_CRU.CRU_CMN_RSTB is the D-PHY reset on all of
> them, so I think you can just write "D-PHY reset".
> Or "D-PHY reset (CRU_CMN_RSTB or CRU_n_S_RESETN)"?

I personally vote for:
 - D-PHY reset (CRU_CMN_RSTB or CRU_n_S_RESETN)

Thanks for the suggestion! :)

> 
> [1] Section 35. Camera Data Receiving Unit (CRU)
>     35.3.1 Starting Reception for the MIPI CSI-2 Input
>     35.3.2.2Stopping the D-PHY (MIPI CSI-2 Input)
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

Regards,
Tommaso