linux-kernel - Re: [PATCH v3 06/46] media: sun6i-csi: Define and use variant to get module clock rate

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Message-ID: <2060330.OBFZWjSADL@kista>
Date:   Tue, 15 Mar 2022 20:31:13 +0100
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 06/46] media: sun6i-csi: Define and use variant to get module clock rate

Dne petek, 11. marec 2022 ob 15:34:52 CET je Paul Kocialkowski napisal(a):
> Introduce a proper variant structure with the module clock rate
> instead of hardcoding it with a manual check on the compatible.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  .../platform/sunxi/sun6i-csi/sun6i_csi.c      | 48 ++++++++++++++-----
>  .../platform/sunxi/sun6i-csi/sun6i_csi.h      |  4 ++
>  2 files changed, 40 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/
media/platform/sunxi/sun6i-csi/sun6i_csi.c
> index 2355088fdc37..4a0d08e0ac25 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> @@ -811,11 +811,17 @@ static int sun6i_csi_resources_setup(struct 
sun6i_csi_device *csi_dev,
>  				     struct platform_device 
*platform_dev)
>  {
>  	struct device *dev = csi_dev->dev;
> -	unsigned long clk_mod_rate;
> +	const struct sun6i_csi_variant *variant;

Ideally, this should be sorted from longest to shortest.

>  	void __iomem *io_base;
>  	int ret;
>  	int irq;
>  
> +	/* Variant */

I don't think this comment is very useful (nor one below for that matter.) 
Please remove it.

With that:
Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> +
> +	variant = of_device_get_match_data(dev);
> +	if (!variant)
> +		return -EINVAL;
> +
>  	/* Registers */
>  
>  	io_base = devm_platform_ioremap_resource(platform_dev, 0);
> @@ -849,12 +855,7 @@ static int sun6i_csi_resources_setup(struct 
sun6i_csi_device *csi_dev,
>  		return PTR_ERR(csi_dev->clk_ram);
>  	}
>  
> -	if (of_device_is_compatible(dev->of_node, "allwinner,sun50i-a64-
csi"))
> -		clk_mod_rate = 300000000;
> -	else
> -		clk_mod_rate = 297000000;
> -
> -	ret = clk_set_rate_exclusive(csi_dev->clk_mod, clk_mod_rate);
> +	ret = clk_set_rate_exclusive(csi_dev->clk_mod, variant-
>clk_mod_rate);
>  	if (ret) {
>  		dev_err(dev, "failed to set mod clock rate\n");
>  		return ret;
> @@ -937,12 +938,35 @@ static int sun6i_csi_remove(struct platform_device 
*pdev)
>  	return 0;
>  }
>  
> +static const struct sun6i_csi_variant sun6i_a31_csi_variant = {
> +	.clk_mod_rate	= 297000000,
> +};
> +
> +static const struct sun6i_csi_variant sun50i_a64_csi_variant = {
> +	.clk_mod_rate	= 300000000,
> +};
> +
>  static const struct of_device_id sun6i_csi_of_match[] = {
> -	{ .compatible = "allwinner,sun6i-a31-csi", },
> -	{ .compatible = "allwinner,sun8i-a83t-csi", },
> -	{ .compatible = "allwinner,sun8i-h3-csi", },
> -	{ .compatible = "allwinner,sun8i-v3s-csi", },
> -	{ .compatible = "allwinner,sun50i-a64-csi", },
> +	{
> +		.compatible	= "allwinner,sun6i-a31-csi",
> +		.data		= &sun6i_a31_csi_variant,
> +	},
> +	{
> +		.compatible	= "allwinner,sun8i-a83t-csi",
> +		.data		= &sun6i_a31_csi_variant,
> +	},
> +	{
> +		.compatible	= "allwinner,sun8i-h3-csi",
> +		.data		= &sun6i_a31_csi_variant,
> +	},
> +	{
> +		.compatible	= "allwinner,sun8i-v3s-csi",
> +		.data		= &sun6i_a31_csi_variant,
> +	},
> +	{
> +		.compatible	= "allwinner,sun50i-a64-csi",
> +		.data		= &sun50i_a64_csi_variant,
> +	},
>  	{},
>  };
>  
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h b/drivers/
media/platform/sunxi/sun6i-csi/sun6i_csi.h
> index 356661b413f8..3c4a3af6b897 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> @@ -59,6 +59,10 @@ struct sun6i_csi_device {
>  	int				planar_offset[3];
>  };
>  
> +struct sun6i_csi_variant {
> +	unsigned long	clk_mod_rate;
> +};
> +
>  /**
>   * sun6i_csi_is_format_supported() - check if the format supported by csi
>   * @csi:	pointer to the csi
> -- 
> 2.35.1
> 
>