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 13:33:19 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Chen-Yu Tsai <wens@...nel.org>
Cc:     Maxime Ripard <mripard@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chen-Yu Tsai <wens@...e.org>
Subject: Re: [PATCH 06/14] media: sun4i-csi: Add support for A10 CSI1 camera
 sensor interface

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?

> +	.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