linux-kernel - Re: [PATCH v4 3/6] clk: meson: eeclk: refactor eeclk common driver to support A1

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Date:   Thu, 12 Dec 2019 11:19:59 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Jian Hu <jian.hu@...ogic.com>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     Kevin Hilman <khilman@...libre.com>,
        "Rob Herring" <robh@...nel.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        Chandle Zou <chandle.zou@...ogic.com>,
        linux-clk@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/6] clk: meson: eeclk: refactor eeclk common driver to support A1


On Fri 06 Dec 2019 at 08:40, Jian Hu <jian.hu@...ogic.com> wrote:

> Introduce a common probe function for A1 series, the way to get
> regmap is different between A1 series and the previous series.
> The register region is only for one clock driver, the function of
> meson_eeclkc_probe is not fit for A1, So it is necessary to
> introduce a new function.

Please drop this patch

#1 you are patching the EE driver for something that is no longer an EE
 driver
#2 Let's get the basics right, you can move (re)factoring afterward

Your probe function is simple enough. Just properly write it in each
driver for now.

>
> Signed-off-by: Jian Hu <jian.hu@...ogic.com>
> ---
>  drivers/clk/meson/meson-eeclk.c | 59 +++++++++++++++++++++++++++------
>  drivers/clk/meson/meson-eeclk.h |  1 +
>  2 files changed, 50 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/clk/meson/meson-eeclk.c b/drivers/clk/meson/meson-eeclk.c
> index a7cb1e7aedc4..12ceb1caabd8 100644
> --- a/drivers/clk/meson/meson-eeclk.c
> +++ b/drivers/clk/meson/meson-eeclk.c
> @@ -13,25 +13,37 @@
>  #include "clk-regmap.h"
>  #include "meson-eeclk.h"
>  
> -int meson_eeclkc_probe(struct platform_device *pdev)
> +static struct regmap_config clkc_regmap_config = {
> +	.reg_bits       = 32,
> +	.val_bits       = 32,
> +	.reg_stride     = 4,
> +};
> +
> +static struct regmap *meson_regmap_resource(struct platform_device *pdev)
> +{
> +	struct resource *res;
> +	void __iomem *base;
> +	struct device *dev = &pdev->dev;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +
> +	base = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(base))
> +		return ERR_CAST(base);
> +
> +	return devm_regmap_init_mmio(dev, base, &clkc_regmap_config);
> +}
> +
> +static int meson_common_probe(struct platform_device *pdev, struct regmap *map)
>  {
>  	const struct meson_eeclkc_data *data;
>  	struct device *dev = &pdev->dev;
> -	struct regmap *map;
>  	int ret, i;
>  
>  	data = of_device_get_match_data(dev);
>  	if (!data)
>  		return -EINVAL;
>  
> -	/* Get the hhi system controller node */
> -	map = syscon_node_to_regmap(of_get_parent(dev->of_node));
> -	if (IS_ERR(map)) {
> -		dev_err(dev,
> -			"failed to get HHI regmap\n");
> -		return PTR_ERR(map);
> -	}
> -
>  	if (data->init_count)
>  		regmap_multi_reg_write(map, data->init_regs, data->init_count);
>  
> @@ -54,3 +66,30 @@ int meson_eeclkc_probe(struct platform_device *pdev)
>  	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
>  					   data->hw_onecell_data);
>  }
> +
> +int meson_eeclkc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct regmap *map;
> +
> +	/* Get the hhi system controller node */
> +	map = syscon_node_to_regmap(of_get_parent(dev->of_node));
> +	if (IS_ERR(map)) {
> +		dev_err(dev,
> +			"failed to get HHI regmap\n");
> +		return PTR_ERR(map);
> +	}
> +
> +	return meson_common_probe(pdev, map);
> +}
> +
> +int meson_clkc_probe(struct platform_device *pdev)
> +{
> +	struct regmap *map;
> +
> +	map = meson_regmap_resource(pdev);
> +	if (IS_ERR(map))
> +		return PTR_ERR(map);
> +
> +	return meson_common_probe(pdev, map);
> +}
> diff --git a/drivers/clk/meson/meson-eeclk.h b/drivers/clk/meson/meson-eeclk.h
> index 77316207bde1..a2e9ab3a4f6b 100644
> --- a/drivers/clk/meson/meson-eeclk.h
> +++ b/drivers/clk/meson/meson-eeclk.h
> @@ -21,5 +21,6 @@ struct meson_eeclkc_data {
>  };
>  
>  int meson_eeclkc_probe(struct platform_device *pdev);
> +int meson_clkc_probe(struct platform_device *pdev);
>  
>  #endif /* __MESON_CLKC_H */