linux-kernel - RE: [PATCH 2/2] soc/fsl: add ftm alarm driver for ls1021a platform

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Date:	Sun, 28 Sep 2014 02:55:25 +0000
From:	"Dongsheng.Wang@...escale.com" <Dongsheng.Wang@...escale.com>
To:	Kumar Gala <galak@...eaurora.org>
CC:	Santosh Shilimkar <santosh.shilimkar@...com>,
	Sandeep Nair <sandeep_n@...com>,
	Olof Johansson <olof@...om.net>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Paul Walmsley <paul@...an.com>, Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Shengchao Guo <Shawn.Guo@...escale.com>
Subject: RE: [PATCH 2/2] soc/fsl: add ftm alarm driver for ls1021a platform

Thanks for your review. :)


> -----Original Message-----
> From: Kumar Gala [mailto:galak@...eaurora.org]
> Sent: Friday, September 26, 2014 10:04 PM
> To: Wang Dongsheng-B40534
> Cc: Santosh Shilimkar; Sandeep Nair; Olof Johansson; shawn.guo@...aro.org; Greg
> KH; Paul Walmsley; Arnd Bergmann; linux-kernel@...r.kernel.org; Guo Shawn-R65073
> Subject: Re: [PATCH 2/2] soc/fsl: add ftm alarm driver for ls1021a platform
> 
> 
> On Sep 26, 2014, at 1:48 AM, Dongsheng Wang <dongsheng.wang@...escale.com> wrote:
> 
> > From: Wang Dongsheng <dongsheng.wang@...escale.com>
> >
> > Only Ftm0 can be used when system going to deep sleep. So this driver
> > to support ftm0 as a wakeup source.
> >
> > Signed-off-by: Wang Dongsheng <dongsheng.wang@...escale.com>
> 
> How does this differ from drivers/clocksource/fsl_ftm_timer.c

Fsl_ftm_timer.c is only for system to provide a clock driver. FTM ip-block can be used
by other functions such as PWM. I think we should not put all of functions into a .c file.
So ftm0 alarm function as a specific block driver in SOC dir.

> 
> Why not extend that with the alarm functionality you need?
The framework of clocksource not provide sys interface to set alarm. And codes of ftm0-alarm
not touch on clocksource framework.

> 
> Also, where is the DT binding spec for this (if you plan on having a separate
> driver)?
Yes, now only a driver. My DT depend on LS1 device tree patches, now LS1 DT is upstreaming but not apply.
After LS1 DT apply, I will add ftm alarm device node.

Regards,
-Dongsheng
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