linux-kernel - Re: [PATCH 02/23] i2c: au1550: Remove #ifdef guards for PM related functions

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Message-ID: <20230706101033.0000207e@Huawei.com>
Date:   Thu, 6 Jul 2023 10:10:33 +0800
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Paul Cercueil <paul@...pouillou.net>
CC:     Wolfram Sang <wsa@...nel.org>, <linux-i2c@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/23] i2c: au1550: Remove #ifdef guards for PM related
 functions

On Wed,  5 Jul 2023 22:42:53 +0200
Paul Cercueil <paul@...pouillou.net> wrote:

> Use the new PM macros for the suspend and resume functions to be
> automatically dropped by the compiler when CONFIG_PM or
> CONFIG_PM_SLEEP are disabled, without having to use #ifdef guards.
> 
> This has the advantage of always compiling these functions in,
> independently of any Kconfig option. Thanks to that, bugs and other
> regressions are subsequently easier to catch.
> 
> Note that the behaviour is slightly different than before; the original
> code wrapped the suspend/resume with #ifdef CONFIG_PM guards, which
> resulted in these functions being compiled in but never used when
> CONFIG_PM_SLEEP was disabled.
> 
> Now, those functions are only compiled in when CONFIG_PM_SLEEP is
> enabled.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/i2c/busses/i2c-au1550.c | 15 +++------------
>  1 file changed, 3 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-au1550.c b/drivers/i2c/busses/i2c-au1550.c
> index e66c12ecf270..8e43f25c117e 100644
> --- a/drivers/i2c/busses/i2c-au1550.c
> +++ b/drivers/i2c/busses/i2c-au1550.c
> @@ -342,7 +342,6 @@ static void i2c_au1550_remove(struct platform_device *pdev)
>  	i2c_au1550_disable(priv);
>  }
>  
> -#ifdef CONFIG_PM
>  static int i2c_au1550_suspend(struct device *dev)
>  {
>  	struct i2c_au1550_data *priv = dev_get_drvdata(dev);
> @@ -361,21 +360,13 @@ static int i2c_au1550_resume(struct device *dev)
>  	return 0;
>  }
>  
> -static const struct dev_pm_ops i2c_au1550_pmops = {
> -	.suspend	= i2c_au1550_suspend,
> -	.resume		= i2c_au1550_resume,
> -};
> -
> -#define AU1XPSC_SMBUS_PMOPS (&i2c_au1550_pmops)
> -
> -#else
> -#define AU1XPSC_SMBUS_PMOPS NULL
> -#endif
> +static DEFINE_SIMPLE_DEV_PM_OPS(i2c_au1550_pmops,
> +				i2c_au1550_suspend, i2c_au1550_resume);
>  
>  static struct platform_driver au1xpsc_smbus_driver = {
>  	.driver = {
>  		.name	= "au1xpsc_smbus",
> -		.pm	= AU1XPSC_SMBUS_PMOPS,
> +		.pm	= pm_sleep_ptr(&i2c_au1550_pmops),
>  	},
>  	.probe		= i2c_au1550_probe,
>  	.remove_new	= i2c_au1550_remove,