linux-kernel - Re: [PATCH 1/5] clocksource: st_lpc: Add LPC timer as a clocksource.

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Message-ID: <20150420071417.GA17802@griffinp-ThinkPad-X1-Carbon-2nd>
Date:	Mon, 20 Apr 2015 08:14:17 +0100
From:	Peter Griffin <peter.griffin@...aro.org>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	srinivas.kandagatla@...il.com, maxime.coquelin@...com,
	patrice.chotard@...com, daniel.lezcano@...aro.org,
	tglx@...utronix.de, lee.jones@...aro.org,
	devicetree@...r.kernel.org, Ajit Pal Singh <ajitpal.singh@...com>
Subject: Re: [PATCH 1/5] clocksource: st_lpc: Add LPC timer as a clocksource.

Hi Paul,

On Fri, 17 Apr 2015, Paul Bolle wrote:
> On Fri, 2015-04-17 at 11:50 +0100, Peter Griffin wrote:
> > --- a/drivers/clocksource/Kconfig
> > +++ b/drivers/clocksource/Kconfig
> 
> > +config CLKSRC_ST_LPC_CLOCK
> > +	bool
> > +	depends on ARCH_STI
> > +	select CLKSRC_OF if OF
> > +	help
> > +	  Enable this option to use the Low Power controller timer
> > +	  as clock source.
> > +
> > +config CLKSRC_ST_LPC_TIMER_SCHED_CLOCK
> > +	bool
> > +	depends on ST_LPC_CLOCK
> 
> It looks like you meant
>      depends on CLKSRC_ST_LPC_CLOCK

Yes your correct, will fix in v2. I did a last minute change to append CLKSRC_,
and seem to have messed it up.

<snip>
> > --- /dev/null
> > +++ b/drivers/clocksource/st_lpc.c
> 
> > +#ifdef CONFIG_CLKSRC_LPC_TIMER_SCHED_CLOCK
> 
> #ifdef CONFIG_CLKSRC_ST_LPC_TIMER_SCHED_CLOCK here?
Yes, will fix in v2
> 
> > +static u64 notrace st_lpc_sched_clock_read(void)
> > +{
> > +	return st_lpc_counter_read();
> > +}
> > +#endif
> 
> > +#ifdef CONFIG_CLKSRC_LPC_TIMER_SCHED_CLOCK
> 
> Again, #ifdef CONFIG_CLKSRC_ST_LPC_TIMER_SCHED_CLOCK here?

Yes, will fix in v2
> 
> > +	sched_clock_register(st_lpc_sched_clock_read, 64, rate);
> > +#endif
> 
> Assuming the above suggestions are correct: checkkconfigsymbols.py, as
> shipped in linux-next, helps detect stuff like this. See
>     scripts/checkkconfigsymbols.py --help.

Thanks for the pointer to the script, I'd not heard of that before, so
will take a look.

Thanks for reviewing, 

regards,

Peter.
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