Re: [PATCH 20/28] mfd: arizona: Remove #ifdef guards for PM related functions

[Richard Fitzgerald <rf@opensource.cirrus.com>]

On 07/08/2022 15:52, Paul Cercueil wrote:
> Only export the arizona_pm_ops if CONFIG_PM is set, but leave the
> suspend/resume functions (and related code) outside #ifdef guards.
> 
> If CONFIG_PM is not set, the arizona_pm_ops will be defined as
> "static __maybe_unused", and the structure plus all the callbacks will
> be automatically dropped by the compiler.
> 
> The advantage is then that these functions are now always compiled
> independently of any Kconfig option, and thanks to that bugs and
> regressions are easier to catch.
> 
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> Cc: patches@opensource.cirrus.com
> ---
>   drivers/mfd/arizona-core.c | 21 +++++++++++----------
>   drivers/mfd/arizona-i2c.c  |  2 +-
>   drivers/mfd/arizona-spi.c  |  2 +-
>   3 files changed, 13 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index cbf1dd90b70d..c1acc9521f83 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -480,7 +480,6 @@ static int wm5102_clear_write_sequencer(struct arizona *arizona)
>   	return 0;
>   }
>   
> -#ifdef CONFIG_PM
>   static int arizona_isolate_dcvdd(struct arizona *arizona)

__maybe_unused?

>   {
>   	int ret;
> @@ -742,9 +741,7 @@ static int arizona_runtime_suspend(struct device *dev)

__maybe_unused?

>   
>   	return 0;
>   }
> -#endif
>   
> -#ifdef CONFIG_PM_SLEEP
>   static int arizona_suspend(struct device *dev)

__maybe_unused?

>   {
>   	struct arizona *arizona = dev_get_drvdata(dev);
> @@ -784,17 +781,21 @@ static int arizona_resume(struct device *dev)

__maybe_unused?

>   
>   	return 0;
>   }
> -#endif
>   
> +#ifndef CONFIG_PM
> +static __maybe_unused
> +#endif

No need to ifdef a __maybe_unused.

>   const struct dev_pm_ops arizona_pm_ops = {
> -	SET_RUNTIME_PM_OPS(arizona_runtime_suspend,
> -			   arizona_runtime_resume,
> -			   NULL)
> -	SET_SYSTEM_SLEEP_PM_OPS(arizona_suspend, arizona_resume)
> -	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(arizona_suspend_noirq,
> -				      arizona_resume_noirq)
> +	RUNTIME_PM_OPS(arizona_runtime_suspend,
> +		       arizona_runtime_resume,
> +		       NULL)
> +	SYSTEM_SLEEP_PM_OPS(arizona_suspend, arizona_resume)
> +	NOIRQ_SYSTEM_SLEEP_PM_OPS(arizona_suspend_noirq,
> +				  arizona_resume_noirq)
>   };
> +#ifdef CONFIG_PM
>   EXPORT_SYMBOL_GPL(arizona_pm_ops);
> +#endif

This ifdeffing is ugly. Why must the structure only be exported if
CONFIG_PM is set?

>   
>   #ifdef CONFIG_OF
>   static int arizona_of_get_core_pdata(struct arizona *arizona)
> diff --git a/drivers/mfd/arizona-i2c.c b/drivers/mfd/arizona-i2c.c
> index 6d83e6b9a692..8799d9183bee 100644
> --- a/drivers/mfd/arizona-i2c.c
> +++ b/drivers/mfd/arizona-i2c.c
> @@ -119,7 +119,7 @@ static const struct of_device_id arizona_i2c_of_match[] = {
>   static struct i2c_driver arizona_i2c_driver = {
>   	.driver = {
>   		.name	= "arizona",
> -		.pm	= &arizona_pm_ops,
> +		.pm	= pm_ptr(&arizona_pm_ops),
>   		.of_match_table	= of_match_ptr(arizona_i2c_of_match),
>   	},
>   	.probe		= arizona_i2c_probe,
> diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c
> index 941b0267d09d..da05b966d48c 100644
> --- a/drivers/mfd/arizona-spi.c
> +++ b/drivers/mfd/arizona-spi.c
> @@ -282,7 +282,7 @@ static const struct of_device_id arizona_spi_of_match[] = {
>   static struct spi_driver arizona_spi_driver = {
>   	.driver = {
>   		.name	= "arizona",
> -		.pm	= &arizona_pm_ops,
> +		.pm	= pm_ptr(&arizona_pm_ops),
>   		.of_match_table	= of_match_ptr(arizona_spi_of_match),
>   		.acpi_match_table = ACPI_PTR(arizona_acpi_match),
>   	},