linux-kernel - Re: [PATCH v2 00/15] clk: sunxi: introduce "modern" clock support

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Date:	Sun, 26 Jun 2016 18:24:31 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Mike Turquette <mturquette@...libre.com>,
	Chen-Yu Tsai <wens@...e.org>, linux-clk@...r.kernel.org,
	Hans de Goede <hdegoede@...hat.com>,
	Andre Przywara <andre.przywara@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Vishnu Patekar <vishnupatekar0510@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Jean-Francois Moine <moinejf@...e.fr>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 00/15] clk: sunxi: introduce "modern" clock support

Hi Stephen,

On Mon, Jun 20, 2016 at 06:48:16PM -0700, Stephen Boyd wrote:
> On 06/07, Maxime Ripard wrote:
> > 
> > The current code has been tested on the H3 and an Orange Pi PC,
> > including making sure that MMC still works, so the general approach
> > seems ok.
> > 
> > Let me know what you think,
> 
> Overall this looks pretty good. Thanks for taking the time to
> rework the driver.
> 
> The macro nesting is sort of concerning, but if you're willing to
> live with a maze of macros I'm not too worried. Also, I don't see
> why we have to use the ccu_common structure everywhere even when
> we're not gaining from it, but it's not a huge problem either
> way. The non-mmio clks could be split off from the mmio list and
> then registered in two lists, or there could be mmio list that
> sets up the base address and then a larger list of clk_hw
> pointers that we just run through and register.

Ok, I'll move the fixed factor clocks out of the ccu_common list.

> It would be great if we could squeeze some more code reuse out of
> the basic types too, but I'm not sure if there's much more that
> can be done. Sometimes I'm seeing the same code multiple times
> for handling muxes with parents and dividers or muxes without
> dividers, etc. But that seems like future work that isn't going
> to block anything here.

I tried my best already to move the common code, but it's not clear at
this point what can be factorised and what will only be used by a
single clock driver. Obviously, as we will support more SoCs, that
will become clearer and we will be able to factor out the code that
needs to be.

> Finally, can you please use the clk_hw_register() APIs that we've
> recently added. That will save us some time converting a new
> driver over to use the new style of registering clks.

Ack, consider it done.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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