linux-kernel - Re: [rtc-linux] Re: [PATCH 1/7] Blackfin RTC driver: the frequency function is in units of Hz, not units of seconds, so lock our driver down to 1 Hz

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Message-ID: <20071204174947.5c468e3d@i1501.lan.towertech.it>
Date:	Tue, 4 Dec 2007 17:49:47 +0100
From:	Alessandro Zummo <alessandro.zummo@...ertech.it>
To:	"Mike Frysinger" <vapier.adi@...il.com>
Cc:	rtc-linux@...glegroups.com, "Bryan Wu" <bryan.wu@...log.com>,
	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	"Mike Frysinger" <michael.frysinger@...log.com>
Subject: Re: [rtc-linux] Re: [PATCH 1/7] Blackfin RTC driver: the frequency
 function is in units of Hz, not units of seconds, so lock our driver down
 to 1 Hz

On Tue, 4 Dec 2007 11:47:56 -0500
"Mike Frysinger" <vapier.adi@...il.com> wrote:

> 
> the return of ENOTTY is to say "changing of freq isnt supported", not
> that the value is invalid.  but i can get the same behavior by
> deleting the function as the rtc-dev layer will take care of returning
> ENOTTY.
> 
> so the behavior is for the RTC_IRQP_SET ioctl:
>  - return ENOTTY if you cannot change freq
>    - the rtc-dev layer will do this for you if you do not set irq_set_freq
>  - return EINVAL if the requested freq is not within the capabilities
> of the hardware
> 
> sound about right ?

 yes, it is. I agree about deleting it.


-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it

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