linux-kernel - Re: [PATCH 3/8] reset: amlogic: split the device and platform probe

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Message-ID: <66ef4ff5-b472-44ee-a4fc-a68ceacea159@salutedevices.com>
Date: Tue, 16 Jul 2024 01:48:18 +0300
From: Jan Dakinevich <jan.dakinevich@...utedevices.com>
To: Jerome Brunet <jbrunet@...libre.com>, Philipp Zabel
	<p.zabel@...gutronix.de>, Stephen Boyd <sboyd@...nel.org>, Neil Armstrong
	<neil.armstrong@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <linux-amlogic@...ts.infradead.org>,
	<linux-clk@...r.kernel.org>
Subject: Re: [PATCH 3/8] reset: amlogic: split the device and platform probe



On 7/10/24 19:25, Jerome Brunet wrote:
> To prepare the addition of the auxiliary device support, split
> out the device probe from the probe of the platform device.
> 
> The device probe will be common to both the platform and auxiliary
> driver.
> 
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
> ---
>  drivers/reset/reset-meson.c | 55 +++++++++++++++++++++++--------------
>  1 file changed, 34 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
> index 59126c9f194a..fec55321b52b 100644
> --- a/drivers/reset/reset-meson.c
> +++ b/drivers/reset/reset-meson.c
> @@ -87,6 +87,27 @@ static const struct reset_control_ops meson_reset_ops = {
>  	.deassert	= meson_reset_deassert,
>  };
>  
> +static int meson_reset_probe(struct device *dev, struct regmap *map,
> +			     const struct meson_reset_param *param)
> +{
> +	unsigned int stride = regmap_get_reg_stride(map);
> +	struct meson_reset *data;
> +
> +	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->param = param;
> +	data->map = map;
> +	data->rcdev.owner = dev->driver->owner;
> +	data->rcdev.nr_resets = param->reg_count * BITS_PER_BYTE
> +		* stride;
> +	data->rcdev.ops = &meson_reset_ops;
> +	data->rcdev.of_node = dev->of_node;

It will be good to add here something like this. Later it would help in
reset debugging.

data->rcdev.dev = dev;

> +
> +	return devm_reset_controller_register(dev, &data->rcdev);
> +}
> +
>  static const struct meson_reset_param meson8b_param = {
>  	.reg_count	= 8,
>  	.reset_offset	= 0x0,
> @@ -125,46 +146,38 @@ static const struct regmap_config regmap_config = {
>  	.reg_stride = 4,
>  };
>  
> -static int meson_reset_probe(struct platform_device *pdev)
> +static int meson_reset_pltf_probe(struct platform_device *pdev)
>  {
> +
> +	const struct meson_reset_param *param;
>  	struct device *dev = &pdev->dev;
> -	struct meson_reset *data;
> +	struct regmap *map;
>  	void __iomem *base;
>  
> -	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> -	if (!data)
> -		return -ENOMEM;
> -
>  	base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(base))
>  		return PTR_ERR(base);
>  
> -	data->param = of_device_get_match_data(dev);
> -	if (!data->param)
> +	param = of_device_get_match_data(dev);
> +	if (!param)
>  		return -ENODEV;
>  
> -	data->map = devm_regmap_init_mmio(dev, base, &regmap_config);
> -	if (IS_ERR(data->map))
> -		return dev_err_probe(dev, PTR_ERR(data->map),
> +	map = devm_regmap_init_mmio(dev, base, &regmap_config);
> +	if (IS_ERR(map))
> +		return dev_err_probe(dev, PTR_ERR(map),
>  				     "can't init regmap mmio region\n");
>  
> -	data->rcdev.owner = THIS_MODULE;
> -	data->rcdev.nr_resets = data->param->reg_count * BITS_PER_BYTE
> -		* regmap_config.reg_stride;
> -	data->rcdev.ops = &meson_reset_ops;
> -	data->rcdev.of_node = dev->of_node;
> -
> -	return devm_reset_controller_register(dev, &data->rcdev);
> +	return meson_reset_probe(dev, map, param);
>  }
>  
> -static struct platform_driver meson_reset_driver = {
> -	.probe	= meson_reset_probe,
> +static struct platform_driver meson_reset_pltf_driver = {
> +	.probe	= meson_reset_pltf_probe,
>  	.driver = {
>  		.name		= "meson_reset",
>  		.of_match_table	= meson_reset_dt_ids,
>  	},
>  };
> -module_platform_driver(meson_reset_driver);
> +module_platform_driver(meson_reset_pltf_driver);
>  
>  MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
>  MODULE_AUTHOR("Neil Armstrong <narmstrong@...libre.com>");

-- 
Best regards
Jan Dakinevich