linux-kernel - Re: [PATCH 06/14] media: sun4i-csi: Add support for A10 CSI1 camera sensor interface

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Date:   Thu, 2 Jan 2020 19:36:25 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Chen-Yu Tsai <wens@...nel.org>, Maxime Ripard <mripard@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/14] media: sun4i-csi: Add support for A10 CSI1 camera
 sensor interface

On Thu, Jan 2, 2020 at 7:33 PM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> Hi Chen-Yu,
>
> Thanks for the patchset.
>
> On Mon, Dec 16, 2019 at 12:59:16AM +0800, Chen-Yu Tsai wrote:
> > From: Chen-Yu Tsai <wens@...e.org>
> >
> > The A10/A20 Allwinner SoCs have two camera sensor interface blocks,
> > named CSI0 and CSI1. The two have the same register layouts with
> > slightly different features:
> >
> >   - CSI0 has an image signal processor (ISP); CSI1 doesn't
> >
> >   - CSI0 can support up to four separate channels under CCIR656;
> >     CSI1 can only support one
> >
> >   - CSI0 can support up to 16-bit wide bus with YUV422;
> >     CSI1 can support up to 24-bit wide bus with YUV444
> >
> > For now the driver doesn't support wide busses, nor CCIR656. So the
> > only relevant difference is whether a clock needs to be taken and
> > enabled for the ISP.
> >
> > Add structs to record the differences, tie them to the compatible
> > strings, and deal with the ISP clock. Support for the new CSI1
> > hardware block is added as well.
> >
> > Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> > ---
> >  .../platform/sunxi/sun4i-csi/sun4i_csi.c      | 35 ++++++++++++++++---
> >  .../platform/sunxi/sun4i-csi/sun4i_csi.h      |  2 ++
> >  2 files changed, 32 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
> > index b8b07c1de2a8..be2466930a49 100644
> > --- a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
> > +++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
> > @@ -29,6 +29,12 @@
> >
> >  #include "sun4i_csi.h"
> >
> > +struct sun4i_csi_traits {
> > +     unsigned int channels;
> > +     unsigned int max_width;
> > +     bool has_isp;
> > +};
> > +
> >  static const struct media_entity_operations sun4i_csi_video_entity_ops = {
> >       .link_validate = v4l2_subdev_link_validate,
> >  };
> > @@ -156,6 +162,10 @@ static int sun4i_csi_probe(struct platform_device *pdev)
> >       subdev = &csi->subdev;
> >       vdev = &csi->vdev;
> >
> > +     csi->traits = of_device_get_match_data(&pdev->dev);
> > +     if (!csi->traits)
> > +             return -EINVAL;
> > +
> >       /*
> >        * On Allwinner SoCs, some high memory bandwidth devices do DMA
> >        * directly over the memory bus (called MBUS), instead of the
> > @@ -199,10 +209,12 @@ static int sun4i_csi_probe(struct platform_device *pdev)
> >               return PTR_ERR(csi->bus_clk);
> >       }
> >
> > -     csi->isp_clk = devm_clk_get(&pdev->dev, "isp");
> > -     if (IS_ERR(csi->isp_clk)) {
> > -             dev_err(&pdev->dev, "Couldn't get our ISP clock\n");
> > -             return PTR_ERR(csi->isp_clk);
> > +     if (csi->traits->has_isp) {
> > +             csi->isp_clk = devm_clk_get(&pdev->dev, "isp");
> > +             if (IS_ERR(csi->isp_clk)) {
> > +                     dev_err(&pdev->dev, "Couldn't get our ISP clock\n");
> > +                     return PTR_ERR(csi->isp_clk);
> > +             }
> >       }
> >
> >       csi->ram_clk = devm_clk_get(&pdev->dev, "ram");
> > @@ -280,8 +292,21 @@ static int sun4i_csi_remove(struct platform_device *pdev)
> >       return 0;
> >  }
> >
> > +struct sun4i_csi_traits sun4i_a10_csi1_traits = {
> > +     .channels = 1,
> > +     .max_width = 24,
> > +     .has_isp = false,
> > +};
> > +
> > +struct sun4i_csi_traits sun7i_a20_csi0_traits = {
>
> These two should be static const, right?

You're right. I'll wait for the remaining reviews before sending v2.

ChenYu

> > +     .channels = 4,
> > +     .max_width = 16,
> > +     .has_isp = true,
> > +};
> > +
> >  static const struct of_device_id sun4i_csi_of_match[] = {
> > -     { .compatible = "allwinner,sun7i-a20-csi0" },
> > +     { .compatible = "allwinner,sun4i-a10-csi1", .data = &sun4i_a10_csi1_traits },
> > +     { .compatible = "allwinner,sun7i-a20-csi0", .data = &sun7i_a20_csi0_traits },
> >       { /* Sentinel */ }
> >  };
> >  MODULE_DEVICE_TABLE(of, sun4i_csi_of_match);
> > diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h
> > index 88d39b3554c4..0f67ff652c2e 100644
> > --- a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h
> > +++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h
> > @@ -108,6 +108,8 @@ struct sun4i_csi {
> >       /* Device resources */
> >       struct device                   *dev;
> >
> > +     const struct sun4i_csi_traits   *traits;
> > +
> >       void __iomem                    *regs;
> >       struct clk                      *bus_clk;
> >       struct clk                      *isp_clk;
>
> --
> Kind regards,
>
> Sakari Ailus