linux-kernel - Re: [PATCH 07/12] rtc: omap: silence bogus power-up reset message at probe

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Date:	Sun, 12 Oct 2014 20:42:40 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Felipe Balbi <balbi@...com>
Cc:	Johan Hovold <johan@...nel.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Tony Lindgren <tony@...mide.com>,
	Benoît Cousson <bcousson@...libre.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lokesh Vutla <lokeshvutla@...com>,
	Guenter Roeck <linux@...ck-us.net>, nsekhar@...com,
	t-kristo@...com, j-keerthy@...com, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/12] rtc: omap: silence bogus power-up reset message at
 probe

On Sat, Oct 11, 2014 at 07:50:07PM -0500, Felipe Balbi wrote:
> Hi,
> 
> On Sat, Oct 11, 2014 at 12:20:04PM +0200, Johan Hovold wrote:
> > On Fri, Oct 10, 2014 at 01:02:56PM -0500, Felipe Balbi wrote:
> > > On Fri, Oct 10, 2014 at 01:00:54PM -0500, Felipe Balbi wrote:
> > > > On Thu, Oct 09, 2014 at 09:06:29PM +0200, Johan Hovold wrote:
> > > > > Some legacy RTC IP revisions has a power-up reset flag in the status
> > > > > register that later revisions lack.
> > > > > 
> > > > > As this flag is always read back as set on later revisions (or is
> > > > > overloaded with a different flag), make sure to only clear the flag and
> > > > > print the info message on legacy platforms.
> > > > > 
> > > > > Signed-off-by: Johan Hovold <johan@...nel.org>
> > > > 
> > > > Reviewed-by: Felipe Balbi <balbi@...com>
> > > 
> > > oh, btw. This should be done for DT probes too.
> > 
> > What do you mean? This is for DT probes (of "ti,da830-rtc" and
> > "ti,am3352-rtc"). DT probing of legacy RTC IPs is currently not
> > supported.
> > 
> > Are you suggesting I should add a new compatible string for that?
> 
> it seemed to me that you're only passing the new flag through
> platform_device_id table, not DT table. Did I miss something ?

Ah, that's just the way the driver currently encodes the IP revision
differences. The platform_device_id entries are references from
of_device_id data. Should probably clean that up as well.

Thanks again for the review. I'll post a new version when I'm back from
Düsseldorf and ELC-E/Plumbers.

Johan
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