linux-kernel - Re: [PATCH next v4 1/2] i2c: hisi: Add initial device tree support

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Date:   Tue, 13 Sep 2022 15:48:08 +0800
From:   Yicong Yang <yangyicong@...wei.com>
To:     Weilong Chen <chenweilong@...wei.com>, <yangyicong@...ilicon.com>,
        <xuwei5@...wei.com>, <wsa@...nel.org>, <robh+dt@...nel.org>
CC:     <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH next v4 1/2] i2c: hisi: Add initial device tree support

On 2022/9/9 15:48, Weilong Chen wrote:
> The HiSilicon I2C controller can be used on embedded platform, which
> boot from devicetree.
> 
> Signed-off-by: Weilong Chen <chenweilong@...wei.com>
> ---
>  drivers/i2c/busses/Kconfig    |  2 +-
>  drivers/i2c/busses/i2c-hisi.c | 19 ++++++++++++++++++-
>  2 files changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 7284206b278b..6d0fdf48e97d 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -673,7 +673,7 @@ config I2C_HIGHLANDER
>  
>  config I2C_HISI
>  	tristate "HiSilicon I2C controller"
> -	depends on (ARM64 && ACPI) || COMPILE_TEST
> +	depends on ARM64 || COMPILE_TEST
>  	help
>  	  Say Y here if you want to have Hisilicon I2C controller support
>  	  available on the Kunpeng Server.
> diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c
> index 76c3d8f6fc3c..7a77f306d05f 100644
> --- a/drivers/i2c/busses/i2c-hisi.c
> +++ b/drivers/i2c/busses/i2c-hisi.c
> @@ -5,6 +5,9 @@
>   * Copyright (c) 2021 HiSilicon Technologies Co., Ltd.
>   */
>  
> +#ifdef CONFIG_ACPI
> +#include <linux/acpi.h>
> +#endif
>  #include <linux/bits.h>
>  #include <linux/bitfield.h>
>  #include <linux/completion.h>
> @@ -13,6 +16,9 @@
>  #include <linux/io.h>
>  #include <linux/module.h>
>  #include <linux/mod_devicetable.h>
> +#ifdef CONFIG_OF
> +#include <linux/of.h>
> +#endif

I don't think the protection for the headers is necessary and common. The
ACPI/OF specific functions should have already been handled well with{out}
ACPI/OF config. Have you met some problems without these?

BTW, it's better to have a changelog when updating the patches.

>  #include <linux/platform_device.h>
>  #include <linux/property.h>
>  #include <linux/units.h>
> @@ -483,17 +489,28 @@ static int hisi_i2c_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_ACPI
>  static const struct acpi_device_id hisi_i2c_acpi_ids[] = {
>  	{ "HISI03D1", 0 },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(acpi, hisi_i2c_acpi_ids);
> +#endif
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id hisi_i2c_dts_ids[] = {
> +	{ .compatible = "hisilicon,hisi-i2c", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, hisi_i2c_dts_ids);
> +#endif
>  
>  static struct platform_driver hisi_i2c_driver = {
>  	.probe		= hisi_i2c_probe,
>  	.driver		= {
>  		.name	= "hisi-i2c",
> -		.acpi_match_table = hisi_i2c_acpi_ids,
> +		.acpi_match_table = ACPI_PTR(hisi_i2c_acpi_ids),
> +		.of_match_table = of_match_ptr(hisi_i2c_dts_ids),
>  	},
>  };
>  module_platform_driver(hisi_i2c_driver);
>