linux-kernel - Re: [PATCH v3 0/4] DT clock bindings

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Message-ID: <87bokd15x7.fsf@octavius.laptop.org>
Date:	Thu, 21 Jun 2012 03:27:00 -0400
From:	Chris Ball <cjb@...top.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org, mturquette@...aro.org,
	s.hauer@...gutronix.de, sboyd@...eaurora.org,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	skannan@...eaurora.org, shawn.guo@...aro.org,
	Mitch Bradley <wmb@...top.org>
Subject: Re: [PATCH v3 0/4] DT clock bindings

Hi Rob,

On Tue, Jun 12 2012, Rob Herring wrote:
> This series defines clock bindings for Device-Tree and adds kernel
> support using the common clock infrastructure. The last patch enables
> DT clock support for the Calxeda Highbank platform.
>
> I'm posting this again to solicit further review. There has been some
> discussion[1], but no definite path forward. This series is not changed
> from the last post other than rebasing to v3.5-rc2.

This is a very useful patchset, thanks!  Mitch Bradley and I have been
hooking up the mach-mmp ARM subarchitecture to it and we needed to
make a few changes, mainly because mach-mmp doesn't use COMMON_CLK.
The changes are:

1) Remove the COMMON_CLK dependency that the of_clk_* functions have by
   moving them into a new file, drivers/clk/clk-of.c.  The OF functions
   in drivers/clk/clk.c aren't dependent on anything else in clk.c
   (since you pass them a struct clk) so they can be moved out easily.
   The of_clk_* entries in clk-provider.h move to clk.h.

2) Use alloc_bootmem() instead of kzalloc() in of_clk_add_provider(),
   because we need to set up clocks during .init_early on ARM (which
   happens pre-slab) so that they are available for platform init.

I'll send our patches in a reply to this mail.  Are you okay with these
changes, and would you like to include them in your patchset?

Thanks very much,

- Chris.
-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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