linux-kernel - Re: [RESEND] clk: ppc-corenet: Add Freescale ARM-based platforms CLK_OF

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Date:	Wed, 27 Aug 2014 18:33:32 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Lu Jingchang-B35083 <jingchang.lu@...escale.com>
CC:	"mturquette@...aro.org" <mturquette@...aro.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RESEND] clk: ppc-corenet: Add Freescale ARM-based platforms
 CLK_OF_DECLARE support

On Tue, 2014-08-26 at 21:19 -0500, Lu Jingchang-B35083 wrote:
> >-----Original Message-----
> >From: Wood Scott-B07421
> >Sent: Wednesday, August 27, 2014 6:51 AM
> >To: Lu Jingchang-B35083
> >Cc: mturquette@...aro.org; linuxppc-dev@...ts.ozlabs.org; linux-
> >kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> >Subject: Re: [RESEND] clk: ppc-corenet: Add Freescale ARM-based platforms
> >CLK_OF_DECLARE support
> >
> >On Fri, 2014-08-22 at 17:34 +0800, Jingchang Lu wrote:
> >> +CLK_OF_DECLARE(ppc_core_pll_v1, "fsl,qoriq-core-pll-1.0",
> >core_pll_init);
> >> +CLK_OF_DECLARE(ppc_core_pll_v2, "fsl,qoriq-core-pll-2.0",
> >core_pll_init);
> >> +CLK_OF_DECLARE(ppc_core_mux_v1, "fsl,qoriq-core-mux-1.0",
> >core_mux_init);
> >> +CLK_OF_DECLARE(ppc_core_mux_v2, "fsl,qoriq-core-mux-2.0",
> >core_mux_init);
> >
> >What does this do that the existing platform driver and match table
> >don't?  Why is it needed for ARM when PPC didn't need it?
> >
> >-Scott
> >
> Common clk init on ARM platform is initialized earlier via of_clk_init() instead of
> driver probe method, the of_clk_init will walk a __clk_of_table to init each clk provider
> in the table, the CLK_OF_DECLARE() macro puts a supported clk in the __clk_of_table for
> it initializing on starup, and the clk system has added some common clk such as "fixed-clk"
> to this table already.
> So here I add our specific clk init declaration to consist this framework, and the driver
> probe function will not be needed on ARM.

OK... Is there any reason why the new method won't work on PPC?

-Scott


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