linux-kernel - RE: [PATCH v3] ARM: ls1021a: add gating clocks to IP blocks.

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Message-ID: <eb17fb36d1a04812836ad46bace8c4bf@BY2PR0301MB0613.namprd03.prod.outlook.com>
Date:	Fri, 26 Sep 2014 03:14:26 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	Shengchao Guo <Shawn.Guo@...escale.com>
CC:	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v3] ARM: ls1021a: add gating clocks to IP blocks.

> > > As the parent of the clocks registered by this function is "dummy" from
> > > what I see, what is the point of setting flag CLK_SET_RATE_PARENT then?
> > >
> > > > +			CLK_IGNORE_UNUSED, reg,	shift,
> > >
> > > Why flag CLK_IGNORE_UNUSED?
> > >
> >
> > As the SoC reference manual all the IP blocks will be enabled when powered
> up.
> > But the Linux OS will disable all the IP blocks' clocks as default without
> this.
> >
> > For now, this gate driver will only used for PM support of some IP blocks.
> For the
> > Others needed to be enabled as default.
> 
> Ok, got it. I'm fine with the flag then, and we can remove it after all
> those client devices manage their clocks well.
> 

Okay.

Thanks,

BRs
Xiubo


> Shawn


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