linux-kernel - RE: [PATCH v2 1/3] ARM: davinci: clk framework support for enable/disable functionality

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Date:	Wed, 20 Mar 2013 11:28:02 +0000
From:	"Philip, Avinash" <avinashphilip@...com>
To:	"Nori, Sekhar" <nsekhar@...com>
CC:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"Manjunathappa, Prakash" <prakash.pm@...com>
Subject: RE: [PATCH v2 1/3] ARM: davinci: clk framework support for
 enable/disable functionality

On Wed, Mar 20, 2013 at 16:49:55, Nori, Sekhar wrote:
> On 3/20/2013 12:11 PM, Philip Avinash wrote:
> > DAVINCI clock framework currently not supporting clock enable/disable
> > functionality on clock nodes. In DAVINCI platform EHRPWM module requires
> 
> Wrong. clock enable/disable is supported in the DaVinci clock
> implementation, but just for PSC clocks.
> 
> > support for clock enable/disable for TBCLK support. Hence this patch
> > adds support for enabling/disabling clocks depends on the availability
> > of the functionality.
> > 
> > Signed-off-by: Philip Avinash <avinashphilip@...com>
> > ---
> > Changes since v1:
> > 	- Add support for clock enable/disable functionality.
> > 
> > :100644 100644 d458558... aa89e5e... M	arch/arm/mach-davinci/clock.c
> > :100644 100644 8694b39... 1e4e836... M	arch/arm/mach-davinci/clock.h
> >  arch/arm/mach-davinci/clock.c |    4 ++++
> >  arch/arm/mach-davinci/clock.h |    2 ++
> >  2 files changed, 6 insertions(+)
> > 
> > diff --git a/arch/arm/mach-davinci/clock.c b/arch/arm/mach-davinci/clock.c
> > index d458558..aa89e5e 100644
> > --- a/arch/arm/mach-davinci/clock.c
> > +++ b/arch/arm/mach-davinci/clock.c
> > @@ -35,6 +35,8 @@ static void __clk_enable(struct clk *clk)
> >  {
> >  	if (clk->parent)
> >  		__clk_enable(clk->parent);
> > +	if (clk->clk_enable)
> > +		clk->clk_enable(clk);
> 
> Why ignore usecount in this case?

Will check usecount & do enable. 

> 
> >  	if (clk->usecount++ == 0 && (clk->flags & CLK_PSC))
> 
> if clk->enable is available, no need to check for 'clk->flags & CLK_PSC'

I will correct it.

Thanks
Avinash

> 
> Thanks,
> Sekhar
>