Re: [PATCH v3 1/3] rtc: m41t80: probe: use IS_ENABLED for CONFIG_OF

[Alexandre Belloni]

On 19/01/2023 21:39:01+0000, Dennis Lambe Jr wrote:
> The style guide recommends IS_ENABLED rather than ifdef for wrapping
> conditional code wherever possible.
> 
> Functions that are only called on DeviceTree platforms would otherwise
> need to be cluttered up with __maybe_unused, which is especially
> undesirable if there's nothing inherently DT-specific about those
> functions.
> 
> Signed-off-by: Dennis Lambe Jr <dennis@xxxxxxxxxxxxxx>
> ---
> 
> Notes:
>     v1 -> v2: spelling fix in changelog
> 
>  drivers/rtc/rtc-m41t80.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
> index 494052dbd39f..f963b76e5fc0 100644
> --- a/drivers/rtc/rtc-m41t80.c
> +++ b/drivers/rtc/rtc-m41t80.c
> @@ -909,10 +909,11 @@ static int m41t80_probe(struct i2c_client *client)
>  	if (IS_ERR(m41t80_data->rtc))
>  		return PTR_ERR(m41t80_data->rtc);
>  
> -#ifdef CONFIG_OF
> -	wakeup_source = of_property_read_bool(client->dev.of_node,
> -					      "wakeup-source");
> -#endif
> +	if (IS_ENABLED(CONFIG_OF)) {
> +		wakeup_source = of_property_read_bool(client->dev.of_node,
> +						      "wakeup-source");
> +	}
> +

A way better patch would switch to fwnode_property_read_bool

>  	if (client->irq > 0) {
>  		rc = devm_request_threaded_irq(&client->dev, client->irq,
>  					       NULL, m41t80_handle_irq,
> -- 
> 2.25.1
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com