linux-kernel - Re: [PATCH 04/18] ARM: at91: make ST (System Timer) soc independent

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Date:	Mon, 20 Feb 2012 02:38:25 +0100
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Ryan Mallon <rmallon@...il.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/18] ARM: at91: make ST (System Timer) soc independent

On 11:22 Mon 20 Feb     , Ryan Mallon wrote:
> On 18/02/12 04:49, Nicolas Ferre wrote:
> 
> > From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
> > 
> > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
> > Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
> > ---
> >  arch/arm/mach-at91/at91rm9200.c              |    4 +-
> >  arch/arm/mach-at91/at91rm9200_time.c         |   37 ++++++++++++++++----------
> >  arch/arm/mach-at91/generic.h                 |    1 +
> >  arch/arm/mach-at91/include/mach/at91_st.h    |   32 +++++++++++++++-------
> >  arch/arm/mach-at91/include/mach/at91rm9200.h |    2 +-
> >  drivers/watchdog/at91rm9200_wdt.c            |    8 +++---
> >  6 files changed, 53 insertions(+), 31 deletions(-)
> > 
> > diff --git a/arch/arm/mach-at91/at91rm9200.c b/arch/arm/mach-at91/at91rm9200.c
> 
> Hi Jean, Nicolas,
> 
> Patch looks mostly good, couple of points below.
> 
> ~Ryan
> 
> <snip>
> 
> >  	/* Cancel any pending alarm; flush any pending IRQ */
> > -	at91_sys_write(AT91_ST_RTAR, alm);
> > -	(void) at91_sys_read(AT91_ST_SR);
> > +	at91_st_write(AT91_ST_RTAR, alm);
> > +	(void) at91_st_read(AT91_ST_SR);
> 
> 
> Can we please remove the (void) casting of the return value when making
> this change, especially since at91_st_read is now a macro which doesn't
> even have a return value. Same in a few other places.
modification done by script and it's no the scope of this patch
> 
> >  
> >  	/* Schedule alarm by writing RTAR. */
> >  	alm += delta;
> > -	at91_sys_write(AT91_ST_RTAR, alm);
> > +	at91_st_write(AT91_ST_RTAR, alm);
> >  
> >  	return status;
> >  }
> > @@ -175,15 +175,24 @@ static struct clock_event_device clkevt = {
> >  	.set_mode	= clkevt32k_mode,
> >  };
> >  
> > +void __iomem *at91_st_base;
> > +
> > +void __init at91rm9200_ioremap_st(u32 addr)
> > +{
> > +	at91_st_base = ioremap(AT91RM9200_BASE_ST, 256);
> > +	if (!at91_st_base)
> > +		panic("Impossible to ioremap ST\n");
> > +}
> 
> 
> I can't see anything in this patch which calls this function? Also, why
> is it extern? Can't it just be moved to whichever file is going to call
> it and make it static there


I see it too this need to be called by rm9200 code and this mustnot be static
as the idea is to have soc independant IP


Best Regards,
J.
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