Re: [PATCH v2 01/18] media: dt-bindings: renesas,rzg2l-csi2: Document Renesas RZ/V2H(P) SoC

Geert Uytterhoeven
2025-02-24T09:01:04Z

Hi all,

On Sun, 23 Feb 2025 at 19:09, Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
> On Fri, Feb 21, 2025 at 04:55:15PM +0100, Tommaso Merciai wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.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.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>

> > --- a/Documentation/devicetree/bindings/media/renesas,rzg2l-csi2.yaml
> > +++ b/Documentation/devicetree/bindings/media/renesas,rzg2l-csi2.yaml

> > @@ -48,7 +58,7 @@ properties:
> > resets:
> > items:
> > - description: CRU_PRESETN reset terminal
> > - - description: CRU_CMN_RSTB reset terminal
> > + - description: CRU_CMN_RSTB reset terminal or D-PHY reset
>
> I'd mention which SoCs these apply to:
>
> - description:
> CRU_CMN_RSTB reset terminal (all but RZ/V2H) or D-PHY reset (RZ/V2H)

Note that RZ/G3E uses the same naming, so be prepared for more churn...

However, I am confused...

1. According to Section 35.3.1 "Starting Reception for the MIPI CSI-2
Input" (RZ/G2L Rev. 1.45) CPG_RST_CRU.CRU_CMN_RSTB _is_ the
D-PHY reset.

2. The CRU has three (not two) resets on all:
- CRU_PRESETN,
- CRU_ARESETN,
- CRU_CMN_RSTB (RZ/G2L, RZ/V2L, and RZ/G2UL) or
CRU_S_RESETN (RZ/V2H and RZ/G3E).

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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