linux-kernel - Re: [PATCH] drivers/rtc/class: Convert from Legacy pm ops to dev_pm

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Date:	Fri, 31 May 2013 16:50:25 +0000
From:	Shuah Khan <shuah.kh@...sung.com>
To:	Shuah Khan <shuah.kh@...sung.com>
Cc:	"a.zummo@...ertech.it" <a.zummo@...ertech.it>,
	"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"shuahkhan@...il.com" <shuahkhan@...il.com>
Subject: Re: [PATCH] drivers/rtc/class: Convert from Legacy pm ops to dev_pm_ops

On 05/31/2013 09:58 AM, Shuah Khan wrote:
> Convert drivers/rtc/class to use dev_pm_ops for power management and
> remove Legacy PM ops hooks. With this change, rtc class registers
> suspend/resume callbacks via class->pm (dev_pm_ops) instead of Legacy
> class->suspend/resume. When __device_suspend() runs call-backs, it will
> find class->pm ops for the rtc class.
>
> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
> ---
>   drivers/rtc/class.c |    7 +++----
>   1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
> index 6638540..21d83ec 100644
> --- a/drivers/rtc/class.c
> +++ b/drivers/rtc/class.c
> @@ -135,9 +135,9 @@ static int rtc_resume(struct device *dev)
>   	return 0;
>   }
>
> +static SIMPLE_DEV_PM_OPS(rtc_class_dev_pm_ops, rtc_suspend, rtc_resume);
>   #else
> -#define rtc_suspend	NULL
> -#define rtc_resume	NULL
> +#define rtc_class_dev_pm_ops	NULL
>   #endif
>
>
> @@ -336,8 +336,7 @@ static int __init rtc_init(void)
>   		pr_err("couldn't create class\n");
>   		return PTR_ERR(rtc_class);
>   	}
> -	rtc_class->suspend = rtc_suspend;
> -	rtc_class->resume = rtc_resume;
> +	rtc_class->pm = &rtc_class_dev_pm_ops;
>   	rtc_dev_init();
>   	rtc_sysfs_init(rtc_class);
>   	return 0;
>

oops. I noticed a build warning rtc_suspend()

drivers/rtc/class.c:138:8: warning: initialization from incompatible 
pointer type [enabled by default]
drivers/rtc/class.c:138:8: warning: (near initialization for 
‘rtc_class_dev_pm_ops.suspend’) [enabled by default]


Please ignore this version. I will re-send v2 with the correct one. I 
missed removing the extra pm_message_t mesg on rtc_suspend().

-- Shuah
Shuah Khan, Linux Kernel Developer - Open Source Group Samsung Research 
America (Silicon Valley) shuah.kh@...sung.com | (970) 672-0658
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