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Message-ID: <812c6ddc-1929-46c4-bac7-4bd0f5ccc213@linaro.org>
Date: Mon, 19 Aug 2024 18:33:58 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Jerome Brunet <jbrunet@...libre.com>,
 Philipp Zabel <p.zabel@...gutronix.de>, Stephen Boyd <sboyd@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org,
 linux-clk@...r.kernel.org
Subject: Re: [PATCH v3 8/9] reset: amlogic: split the device core and platform
 probe

On 08/08/2024 12:27, Jerome Brunet wrote:
> To prepare the addition of the auxiliary device support, split
> out the device core function from the probe of the platform device.
> 
> The device core function will be common to both the platform and auxiliary
> driver.
> 
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
> ---
>   drivers/reset/amlogic/Kconfig                 |  10 +-
>   drivers/reset/amlogic/Makefile                |   3 +-
>   .../{reset-meson.c => reset-meson-core.c}     | 101 +++---------------
>   drivers/reset/amlogic/reset-meson-pltf.c      |  92 ++++++++++++++++

Are we still in 1983 ? please use reset-meson-platform and drop pltf completely

>   drivers/reset/amlogic/reset-meson.h           |  24 +++++
>   5 files changed, 143 insertions(+), 87 deletions(-)
>   rename drivers/reset/amlogic/{reset-meson.c => reset-meson-core.c} (51%)
>   create mode 100644 drivers/reset/amlogic/reset-meson-pltf.c
>   create mode 100644 drivers/reset/amlogic/reset-meson.h
> 
> diff --git a/drivers/reset/amlogic/Kconfig b/drivers/reset/amlogic/Kconfig
> index 7ed9cf50f038..04c7be0f3165 100644
> --- a/drivers/reset/amlogic/Kconfig
> +++ b/drivers/reset/amlogic/Kconfig
> @@ -1,9 +1,15 @@
> +config RESET_MESON_CORE
> +	tristate
> +	select REGMAP
> +
>   config RESET_MESON
> -	tristate "Meson Reset Driver"
> +	tristate "Meson Reset Platform Driver"
>   	depends on ARCH_MESON || COMPILE_TEST
>   	default ARCH_MESON
> +	select REGMAP_MMIO
> +	select RESET_MESON_CORE
>   	help
> -	  This enables the reset driver for Amlogic Meson SoCs.
> +	  This enables the reset platform driver for Amlogic SoCs.
>   
>   config RESET_MESON_AUDIO_ARB
>   	tristate "Meson Audio Memory Arbiter Reset Driver"
> diff --git a/drivers/reset/amlogic/Makefile b/drivers/reset/amlogic/Makefile
> index 55509fc78513..0f8f9121b566 100644
> --- a/drivers/reset/amlogic/Makefile
> +++ b/drivers/reset/amlogic/Makefile
> @@ -1,2 +1,3 @@
> -obj-$(CONFIG_RESET_MESON) += reset-meson.o
> +obj-$(CONFIG_RESET_MESON) += reset-meson-pltf.o
> +obj-$(CONFIG_RESET_MESON_CORE) += reset-meson-core.o
>   obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o
> diff --git a/drivers/reset/amlogic/reset-meson.c b/drivers/reset/amlogic/reset-meson-core.c
> similarity index 51%
> rename from drivers/reset/amlogic/reset-meson.c
> rename to drivers/reset/amlogic/reset-meson-core.c
> index b16d9c32adb1..ea4fc562f7e6 100644
> --- a/drivers/reset/amlogic/reset-meson.c
> +++ b/drivers/reset/amlogic/reset-meson-core.c
> @@ -1,27 +1,17 @@
>   // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
>   /*
> - * Amlogic Meson Reset Controller driver
> + * Amlogic Meson Reset core functions
>    *
> - * Copyright (c) 2016 BayLibre, SAS.
> - * Author: Neil Armstrong <narmstrong@...libre.com>

Hmmm no, I'm still an author

> + * Copyright (c) 2024 BayLibre, SAS.

And Baylibre's Copyright is still from 2016, so use 2016-2024 in this case

> + * Author: Jerome Brunet <jbrunet@...libre.com>
>    */
> -#include <linux/err.h>
> -#include <linux/init.h>
> -#include <linux/io.h>
> -#include <linux/of.h>
> +
> +#include <linux/device.h>
>   #include <linux/module.h>
> -#include <linux/platform_device.h>
>   #include <linux/regmap.h>
>   #include <linux/reset-controller.h>
> -#include <linux/slab.h>
> -#include <linux/types.h>
> -
> -struct meson_reset_param {
> -	unsigned int reset_num;
> -	unsigned int reset_offset;
> -	unsigned int level_offset;
> -	bool level_low_reset;
> -};
> +
> +#include "reset-meson.h"
>   
>   struct meson_reset {
>   	const struct meson_reset_param *param;
> @@ -102,84 +92,27 @@ static const struct reset_control_ops meson_reset_ops = {
>   	.status		= meson_reset_status,
>   };
>   
> -static const struct meson_reset_param meson8b_param = {
> -	.reset_num	= 256,
> -	.reset_offset	= 0x0,
> -	.level_offset	= 0x7c,
> -	.level_low_reset = true,
> -};
> -
> -static const struct meson_reset_param meson_a1_param = {
> -	.reset_num	= 96,
> -	.reset_offset	= 0x0,
> -	.level_offset	= 0x40,
> -	.level_low_reset = true,
> -};
> -
> -static const struct meson_reset_param meson_s4_param = {
> -	.reset_num	= 192,
> -	.reset_offset	= 0x0,
> -	.level_offset	= 0x40,
> -	.level_low_reset = true,
> -};
> -
> -static const struct of_device_id meson_reset_dt_ids[] = {
> -	 { .compatible = "amlogic,meson8b-reset",    .data = &meson8b_param},
> -	 { .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param},
> -	 { .compatible = "amlogic,meson-axg-reset",  .data = &meson8b_param},
> -	 { .compatible = "amlogic,meson-a1-reset",   .data = &meson_a1_param},
> -	 { .compatible = "amlogic,meson-s4-reset",   .data = &meson_s4_param},
> -	 { .compatible = "amlogic,c3-reset",   .data = &meson_s4_param},
> -	 { /* sentinel */ },
> -};
> -MODULE_DEVICE_TABLE(of, meson_reset_dt_ids);
> -
> -static const struct regmap_config regmap_config = {
> -	.reg_bits   = 32,
> -	.val_bits   = 32,
> -	.reg_stride = 4,
> -};
> -
> -static int meson_reset_probe(struct platform_device *pdev)
> +int meson_reset_probe(struct device *dev, struct regmap *map,
> +		      const struct meson_reset_param *param)
>   {
> -	struct device *dev = &pdev->dev;
>   	struct meson_reset *data;
> -	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 = device_get_match_data(dev);
> -	if (!data->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),
> -				     "can't init regmap mmio region\n");
> -
> -	data->rcdev.owner = THIS_MODULE;
> -	data->rcdev.nr_resets = data->param->reset_num;
> +	data->param = param;
> +	data->map = map;
> +	data->rcdev.owner = dev->driver->owner;
> +	data->rcdev.nr_resets = param->reset_num;
>   	data->rcdev.ops = &meson_reset_ops;
>   	data->rcdev.of_node = dev->of_node;
>   
>   	return devm_reset_controller_register(dev, &data->rcdev);
>   }
> +EXPORT_SYMBOL_NS_GPL(meson_reset_probe, MESON_RESET);
>   
> -static struct platform_driver meson_reset_driver = {
> -	.probe	= meson_reset_probe,
> -	.driver = {
> -		.name		= "meson_reset",
> -		.of_match_table	= meson_reset_dt_ids,
> -	},
> -};
> -module_platform_driver(meson_reset_driver);
> -
> -MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
> +MODULE_DESCRIPTION("Amlogic Meson Reset Core function");
>   MODULE_AUTHOR("Neil Armstrong <narmstrong@...libre.com>");
> -MODULE_LICENSE("Dual BSD/GPL");
> +MODULE_AUTHOR("Jerome Brunet <jbrunet@...libre.com>");
> +MODULE_IMPORT_NS(MESON_RESET);
> diff --git a/drivers/reset/amlogic/reset-meson-pltf.c b/drivers/reset/amlogic/reset-meson-pltf.c
> new file mode 100644
> index 000000000000..97e933b4aa34
> --- /dev/null
> +++ b/drivers/reset/amlogic/reset-meson-pltf.c
> @@ -0,0 +1,92 @@
> +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
> +/*
> + * Amlogic Meson Reset platform driver
> + *
> + * Copyright (c) 2016 BayLibre, SAS.
> + * Author: Neil Armstrong <narmstrong@...libre.com>
> + */
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset-controller.h>
> +
> +#include "reset-meson.h"
> +
> +static const struct meson_reset_param meson8b_param = {
> +	.reset_num	= 256,
> +	.reset_offset	= 0x0,
> +	.level_offset	= 0x7c,
> +	.level_low_reset = true,
> +};
> +
> +static const struct meson_reset_param meson_a1_param = {
> +	.reset_num	= 96,
> +	.reset_offset	= 0x0,
> +	.level_offset	= 0x40,
> +	.level_low_reset = true,
> +};
> +
> +static const struct meson_reset_param meson_s4_param = {
> +	.reset_num	= 192,
> +	.reset_offset	= 0x0,
> +	.level_offset	= 0x40,
> +	.level_low_reset = true,
> +};
> +
> +static const struct of_device_id meson_reset_dt_ids[] = {
> +	 { .compatible = "amlogic,meson8b-reset",    .data = &meson8b_param},
> +	 { .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param},
> +	 { .compatible = "amlogic,meson-axg-reset",  .data = &meson8b_param},
> +	 { .compatible = "amlogic,meson-a1-reset",   .data = &meson_a1_param},
> +	 { .compatible = "amlogic,meson-s4-reset",   .data = &meson_s4_param},
> +	 { .compatible = "amlogic,c3-reset",   .data = &meson_s4_param},
> +	 { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, meson_reset_dt_ids);
> +
> +static const struct regmap_config regmap_config = {
> +	.reg_bits   = 32,
> +	.val_bits   = 32,
> +	.reg_stride = 4,
> +};
> +
> +static int meson_reset_pltf_probe(struct platform_device *pdev)
> +{
> +	const struct meson_reset_param *param;
> +	struct device *dev = &pdev->dev;
> +	struct regmap *map;
> +	void __iomem *base;
> +
> +	base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	param = device_get_match_data(dev);
> +	if (!param)
> +		return -ENODEV;
> +
> +	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");
> +
> +	return meson_reset_probe(dev, map, param);
> +}
> +
> +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_pltf_driver);
> +
> +MODULE_DESCRIPTION("Amlogic Meson Reset Platform Controller driver");
> +MODULE_AUTHOR("Neil Armstrong <narmstrong@...libre.com>");
> +MODULE_AUTHOR("Jerome Brunet <jbrunet@...libre.com>");
> +MODULE_LICENSE("Dual BSD/GPL");
> +MODULE_IMPORT_NS(MESON_RESET);
> diff --git a/drivers/reset/amlogic/reset-meson.h b/drivers/reset/amlogic/reset-meson.h
> new file mode 100644
> index 000000000000..c2e8a5cf2e46
> --- /dev/null
> +++ b/drivers/reset/amlogic/reset-meson.h
> @@ -0,0 +1,24 @@
> +/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
> +/*
> + * Copyright (c) 2024 BayLibre, SAS.
> + * Author: Jerome Brunet <jbrunet@...libre.com>
> + */
> +
> +#ifndef __MESON_RESET_CORE_H
> +#define __MESON_RESET_CORE_H
> +
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/reset-controller.h>
> +
> +struct meson_reset_param {
> +	unsigned int reset_num;
> +	unsigned int reset_offset;
> +	unsigned int level_offset;
> +	bool level_low_reset;
> +};
> +
> +int meson_reset_probe(struct device *dev, struct regmap *map,
> +		      const struct meson_reset_param *param);
> +
> +#endif /* __MESON_RESET_CORE_H */


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