linux-kernel - Re: X86: Impossible select Enhanced Real Time Clock Support (legacy PC RTC driver)

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Date:	Fri, 02 May 2014 22:03:59 +0200
From:	Stefani Seibold <stefani@...bold.net>
To:	Alessandro Zummo <a.zummo@...ertech.it>
Cc:	John Stultz <john.stultz@...aro.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	Prarit Bhargava <prarit@...hat.com>
Subject: Re: X86: Impossible select Enhanced Real Time Clock Support (legacy
 PC RTC driver)

On Mon, 2014-04-28 at 20:20 +0200, Alessandro Zummo wrote:
> On Mon, 28 Apr 2014 11:16:37 -0700
> John Stultz <john.stultz@...aro.org> wrote:
> 
> > >> This breaks the API since there is no more misc device /dev/rtc
> > >> available without a udev rule or a link to /dev/rtc0.  
> > 
> > So yea.. I feel like that /dev/rtcN renaming (and API) break (which
> > was a huge and annoying pain) was back in the 2.6.18-ish era?
> 
>  It's very old and linking/renaming is around since then.
> 
> > But it sounds like the driver/char/rtc bit is dead code, and needs a
> > cleanup? Or is there some use of that code that you need that the
> > generic RTC layer doesn't have?
> 

The driver/char/rtc is not working code and should be a wrapper to the
first rtc device.

>  as far as I know, no recent distribution is using the old code
>  anymore and the new (well, not so new anymore) framework provides the same functionality.
>  

Embedded distribution use it and depending on the /dev/rtc device. So
what is missing is the /dev/rtc misc device 10,135.

- Stefani

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