linux-kernel - Re: [PATCH v6 4/7] clk: mediatek: Add MT2701 clock support

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Date:	Mon, 15 Feb 2016 17:19:42 +0800
From:	James Liao <jamesjj.liao@...iatek.com>
To:	Michael Turquette <mturquette@...libre.com>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Rob Herring <robh@...nel.org>,
	John Crispin <blogic@...nwrt.org>,
	Arnd Bergmann <arnd@...db.de>,
	Sascha Hauer <kernel@...gutronix.de>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	<srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
	Shunli Wang <shunli.wang@...iatek.com>
Subject: Re: [PATCH v6 4/7] clk: mediatek: Add MT2701 clock support

Hi Mike,

On Wed, 2016-02-10 at 12:08 -0800, Michael Turquette wrote:
> Quoting James Liao (2016-02-05 01:37:27)
> > +CLK_OF_DECLARE(mtk_topckgen, "mediatek,mt2701-topckgen", mtk_topckgen_init);
> > +CLK_OF_DECLARE(mtk_infrasys, "mediatek,mt2701-infracfg", mtk_infrasys_init);
> > +CLK_OF_DECLARE(mtk_pericfg, "mediatek,mt2701-pericfg", mtk_pericfg_init);
> > +CLK_OF_DECLARE(mtk_mmsys, "mediatek,mt2701-mmsys", mtk_mmsys_init);
> > +CLK_OF_DECLARE(mtk_imgsys, "mediatek,mt2701-imgsys", mtk_imgsys_init);
> > +CLK_OF_DECLARE(mtk_vdecsys, "mediatek,mt2701-vdecsys", mtk_vdecsys_init);
> > +CLK_OF_DECLARE(mtk_hifsys, "mediatek,mt2701-hifsys", mtk_hifsys_init);
> > +CLK_OF_DECLARE(mtk_ethsys, "mediatek,mt2701-ethsys", mtk_ethsys_init);
> > +CLK_OF_DECLARE(mtk_bdpsys, "mediatek,mt2701-bdpsys", mtk_bdpsys_init);
> > +CLK_OF_DECLARE(mtk_apmixedsys, "mediatek,mt2701-apmixedsys",
> 
> :-/
> 
> This is way too much CLK_OF_DECLARE and not enough Linux Driver Model.
> 
> I understand that some platforms really must initialize some clocks very
> early, but can we please separate those into one table and call
> CLK_OF_DECLARE on only that set, and then register the rest through a
> platform_driver later on?

I know CLK_OF_DECLARE is much earlier than platform_driver, so it can
ensure all drivers lookup their clocks successfully during
platform_driver probe. Is there anything different to init these clock
providers in CLK_OF_DECLARE and platform_driver?


Best regards,

James