linux-kernel - RE: [PATCH v2 2/3] clocksource: tegra: Define timer bases in header file

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Date:	Wed, 5 Feb 2014 13:41:28 -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 2/3] clocksource: tegra: Define timer bases in header
 file

> > +/* Tegra 20 timers */
> > +#define TEGRA20_TIMER1_BASE	0x0
> > +#define TEGRA20_TIMER2_BASE	0x8
> > +#define TEGRA20_TIMER3_BASE	0x50
> > +#define TEGRA20_TIMER4_BASE	0x58
> > +
> > +/* Tegra 30 timers */
> > +#define TEGRA30_TIMER1_BASE	TEGRA20_TIMER1_BASE
> > +#define TEGRA30_TIMER2_BASE	TEGRA20_TIMER2_BASE
> > +#define TEGRA30_TIMER3_BASE	TEGRA20_TIMER3_BASE
> > +#define TEGRA30_TIMER4_BASE	TEGRA20_TIMER4_BASE
> > +#define TEGRA30_TIMER5_BASE	0x60
> > +#define TEGRA30_TIMER6_BASE	0x68
> > +#define TEGRA30_TIMER7_BASE	0x70
> > +#define TEGRA30_TIMER8_BASE	0x78
> > +#define TEGRA30_TIMER9_BASE	0x80
> > +#define TEGRA30_TIMER0_BASE	0x88
> 
> Why put the SoC name in the define names? Why not just have
> TIMER1_BASE..TIMER10_BASE (that should be 10 not 0 as in your patch,
> right?) and have the driver know that 1..4 are valid on Tegra20, and
> 1..10 are valid on later chips.
> 
> I guess if the defines are moved into a header file, adding a TEGRA_ prefix
> does make sense.
> 
> But I wonder if it wouldn't be simpler for the Tegra WDT driver to just call a
> function on the Tegra clocksource driver to find out which timer
> ID(s) to avoid using? Even simpler would be to just put a comment in the
> WDT driver saying that timer 5 was chosen arbitrarily, but if it's changed make
> sure not to conflict with the clocksource driver (and an equivalent change to
> the clocksource driver).

Alright, I think I'll just go with putting a comment in the WDT driver then, so that
We don't need to add this new header file.
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