linux-kernel - Re: [PATCH 04/10] rtc: at91rm9200: use of_platform

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Date:   Wed, 18 Dec 2019 17:43:48 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Eugen.Hristev@...rochip.com
Cc:     jic23@...nel.org, robh+dt@...nel.org, Nicolas.Ferre@...rochip.com,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-rtc@...r.kernel.org, a.zummo@...ertech.it,
        Ludovic.Desroches@...rochip.com
Subject: Re: [PATCH 04/10] rtc: at91rm9200: use of_platform_populate as
 return value

Hi,

On 18/12/2019 16:24:00+0000, Eugen.Hristev@...rochip.com wrote:
> From: Eugen Hristev <eugen.hristev@...rochip.com>
> 
> This allows the RTC node to have child nodes in DT.
> This allows subnodes to be probed.
> 
> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
> ---
>  drivers/rtc/rtc-at91rm9200.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
> index 3b833e0..f1b5b3d 100644
> --- a/drivers/rtc/rtc-at91rm9200.c
> +++ b/drivers/rtc/rtc-at91rm9200.c
> @@ -421,7 +421,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
>  	at91_rtc_write_ier(AT91_RTC_SECEV);
>  
>  	dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
> -	return 0;
> +	return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
>  

You can avoid the DT binding change and DT parsing by using
platform_add_device here. I don't think there is any point describing
the trigger as a child node (a watchdog functionality wouldn't be
described for example).

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