linux-kernel - RE: [PATCH v2 1/3] clocksource: tegra: Add nvidia,tegra30-timer compat

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Message-ID: <643E69AA4436674C8F39DCC2C05F763863199859AC@HQMAIL03.nvidia.com>
Date:	Wed, 5 Feb 2014 12:06:57 -0800
From:	Andrew Chew <AChew@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"thierry.reding@...il.com" <thierry.reding@...il.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"abrestic@...omium.org" <abrestic@...omium.org>,
	"dgreid@...omium.org" <dgreid@...omium.org>,
	"katierh@...omium.org" <katierh@...omium.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: RE: [PATCH v2 1/3] clocksource: tegra: Add nvidia,tegra30-timer
 compat

> On 02/03/2014 05:17 PM, Andrew Chew wrote:
> > There are some differences between tegra20's timer registers and
> > tegra30's (and later).  For example, tegra30 has more timers.  In
> > addition, watchdogs are not present in tegra20.
> >
> > Add this compatibility string in order to be able to distinguish
> > whether the additional timers and watchdogs are there or not.
> 
> > diff --git a/drivers/clocksource/tegra20_timer.c
> > b/drivers/clocksource/tegra20_timer.c
> 
> >  CLOCKSOURCE_OF_DECLARE(tegra20_timer, "nvidia,tegra20-timer",
> > tegra20_init_timer);
> > +CLOCKSOURCE_OF_DECLARE(tegra30_timer, "nvidia,tegra30-timer",
> > +tegra20_init_timer);
> 
> Thinking about this more, nothing in this driver actually cares about
> Tegra20 vs. Tegra30+, since the timer that's used is present in all chips.
> Hence, this patch isn't needed.

Don't I need to add nvidia,tegra30-timer so that the tegra WDT driver
can match against it?  It would be weird to have the tegra WDT driver
bind against nvidia,tegra20-timer when the tegra WDT driver as it is won't
work at all on tegra20.
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