Re: [RESEND] clk: ppc-corenet: Add Freescale ARM-based platforms CLK_OF_DECLARE support

From: Scott Wood
Date: Wed Aug 27 2014 - 19:33:45 EST

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@xxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx; linux-
> >kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> >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?


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