linux-kernel - Re: [rtc-linux] [PATCH V1 3/6] rtc: da9062: DA9062 RTC driver

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Message-ID: <20150513125858.GX3338@piout.net>
Date:	Wed, 13 May 2015 14:58:58 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	"Opensource [Steve Twiss]" <stwiss.opensource@...semi.com>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	LINUXKERNEL <linux-kernel@...r.kernel.org>,
	RTCLINUX <rtc-linux@...glegroups.com>,
	DEVICETREE <devicetree@...r.kernel.org>,
	David Dajun Chen <david.chen@...semi.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	LINUXINPUT <linux-input@...r.kernel.org>,
	LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Support Opensource <Support.Opensource@...semi.com>,
	Wim Van Sebroeck <wim@...ana.be>
Subject: Re: [rtc-linux] [PATCH V1 3/6] rtc: da9062: DA9062 RTC driver

Hi,

On 13/05/2015 at 12:31:36 +0000, Opensource [Steve Twiss] wrote :
> Something similar is being discussed for the OnKey component of the DA9062.
> https://lkml.org/lkml/2015/4/24/304
> 
> It is only the OnKey and RTC components that are similar to the DA9063 chip
> and I was hoping to keep the 62 RTC separate in this case ... however it should
> definitely be possible to re-use the DA9063 RTC driver if this is your requirement.
> If this will block my submission of the DA9062 then I will drop the RTC from my
> next patch set and try to re-work the existing 63 RTC driver accordingly.
> 
> I think this sort of thing has been done before:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/rtc/rtc-pm8xxx.c
>  ... at first glance -- it seems to support that sort of thing.
> 

Isn't that exactly the point of using the MFD infrastructure? It allows
to reuse existing drivers even when the IP is part of a different chip.
The RTC inside the da9062 and the da9063 are obviously the same so there
is no point in duplicating the driver.

I'm guessing using da9063-rtc instead of da9062-rtc is just working
fine.

> I guess it would be possible to rename the da9063-rtc to something more sensible like
> da9xxx-rtc.c if this goes ahead?
> 

Sure, that can be done but this means that the module name will change.
if you feel that your current users can cope with that, I'm fine with it.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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