linux-kernel - Re: [PATCH v2 08/18] media: rzg2l-cru: csi2: Introduce SoC-specific D-PHY handling

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Message-ID: <CA+V-a8sMLC6f2-1tL9cRdLLPsJtv82TiW8MzJ5+1QKnppCSJ_A@mail.gmail.com>
Date: Sun, 23 Feb 2025 21:21:18 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>, 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, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...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>, 
	Hans Verkuil <hverkuil@...all.nl>, Uwe Kleine-König <u.kleine-koenig@...libre.com>, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/18] media: rzg2l-cru: csi2: Introduce SoC-specific
 D-PHY handling

Hi Laurent,

Thank you for the review.

On Sun, Feb 23, 2025 at 6:18 PM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Tommaso,
>
> Thank you for the patch.
>
> On Fri, Feb 21, 2025 at 04:55:22PM +0100, Tommaso Merciai wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > In preparation for adding support for the RZ/V2H(P) SoC, where the D-PHY
> > differs from the existing RZ/G2L implementation, introduce a new
> > rzg2l_csi2_info structure. This structure provides function pointers for
> > SoC-specific D-PHY enable and disable operations.
> >
> > Modify rzg2l_csi2_dphy_setting() to use these function pointers instead of
> > calling rzg2l_csi2_dphy_enable() and rzg2l_csi2_dphy_disable() directly.
> > Update the device match table to store the appropriate function pointers
> > for each compatible SoC.
> >
> > This change prepares the driver for future extensions without affecting
> > the current functionality for RZ/G2L.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
> > ---
> >  .../platform/renesas/rzg2l-cru/rzg2l-csi2.c   | 24 ++++++++++++++++---
> >  1 file changed, 21 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
> > index 4ccf7c5ea58b..3a4e720ba732 100644
> > --- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
> > +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
> > @@ -107,6 +107,7 @@ struct rzg2l_csi2 {
> >       void __iomem *base;
> >       struct reset_control *presetn;
> >       struct reset_control *cmn_rstb;
> > +     const struct rzg2l_csi2_info *info;
> >       struct clk *sysclk;
> >       struct clk *vclk;
> >       unsigned long vclk_rate;
> > @@ -123,6 +124,11 @@ struct rzg2l_csi2 {
> >       bool dphy_enabled;
> >  };
> >
> > +struct rzg2l_csi2_info {
> > +     int (*dphy_enable)(struct rzg2l_csi2 *csi2);
> > +     int (*dphy_disable)(struct rzg2l_csi2 *csi2);
> > +};
>
> Unless you'll need to add non-function fields later, I'd name the
> structure rzg2l_csi2_phy_ops.
>
As based on the feedback on patch 09/18 I will keep the struct name as is.

> > +
> >  struct rzg2l_csi2_timings {
> >       u32 t_init;
> >       u32 tclk_miss;
> > @@ -360,9 +366,9 @@ static int rzg2l_csi2_dphy_setting(struct v4l2_subdev *sd, bool on)
> >       struct rzg2l_csi2 *csi2 = sd_to_csi2(sd);
> >
> >       if (on)
> > -             return rzg2l_csi2_dphy_enable(csi2);
> > +             return csi2->info->dphy_enable(csi2);
> >
> > -     return rzg2l_csi2_dphy_disable(csi2);
> > +     return csi2->info->dphy_disable(csi2);
> >  }
> >
> >  static int rzg2l_csi2_mipi_link_enable(struct rzg2l_csi2 *csi2)
> > @@ -772,6 +778,10 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
> >       if (!csi2)
> >               return -ENOMEM;
> >
> > +     csi2->info = of_device_get_match_data(dev);
> > +     if (!csi2->info)
> > +             return dev_err_probe(dev, -EINVAL, "Failed to get OF match data\n");
> > +
> >       csi2->base = devm_platform_ioremap_resource(pdev, 0);
> >       if (IS_ERR(csi2->base))
> >               return PTR_ERR(csi2->base);
> > @@ -890,8 +900,16 @@ static const struct dev_pm_ops rzg2l_csi2_pm_ops = {
> >                      rzg2l_csi2_pm_runtime_resume, NULL)
> >  };
> >
> > +static const struct rzg2l_csi2_info rzg2l_csi2_info = {
> > +     .dphy_enable = rzg2l_csi2_dphy_enable,
> > +     .dphy_disable = rzg2l_csi2_dphy_disable,
> > +};
>
> I'd recommend moving this just below the definition of the
> rzg2l_csi2_dphy_enable() function.
>
Ok.

> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
>
> > +
> >  static const struct of_device_id rzg2l_csi2_of_table[] = {
> > -     { .compatible = "renesas,rzg2l-csi2", },
> > +     {
> > +             .compatible = "renesas,rzg2l-csi2",
> > +             .data = &rzg2l_csi2_info,
> > +     },
> >       { /* sentinel */ }
> >  };
> >  MODULE_DEVICE_TABLE(of, rzg2l_csi2_of_table);
>
> --
> Regards,
>
> Laurent Pinchart
>
Chers,
Prabhakar