linux-kernel - Re: [RFC 05/17] ARM: highbank: remove custom .init

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Message-ID: <5213CB19.6000905@gmail.com>
Date:	Tue, 20 Aug 2013 22:01:29 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Rob Herring <rob.herring@...xeda.com>
CC:	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 05/17] ARM: highbank: remove custom .init_time hook

On 08/20/2013 09:12 PM, Rob Herring wrote:
> On 08/19/2013 09:04 PM, Sebastian Hesselbarth wrote:
>> With arch/arm calling of_clk_init(NULL) from time_init(), we can now
>> remove custom .init_time hooks. Highbank clock provider need a reference
>> to system registers, as a workaround current clk driver maps those
>> independent of arch code now.
>>
>> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
>> ---
>> Notes:
>> - I suggest to consolidate the four single clock providers into a single
>>    provider with one node if possible.
>
> And how do you suggest doing that while maintaining the DT ABI?

Rob,

I am aware of ABI status of the DT bindings and the discussion about
deprecating/cleanup of what went in in the past. Maybe "suggest" is a
little bit too strong and should have been "would be nice to have".

But looking at clk-highbank, all providers depend on the same register.
If you'd introduce e.g. a new "calxeda,core-clocks" that sets up the
four providers and also CLK_OF_DECLARE the same init with one out of
the  four existing compatibles shouldn't that maintain backwards
compatibility?

Anyway, I was just puting the note above to raise some comment on it.
You actually gave a good one to leave it as is.

>> ---
>>   arch/arm/mach-highbank/highbank.c |   23 +++++++----------------
>>   drivers/clk/clk-highbank.c        |   10 +++++++---
>>   2 files changed, 14 insertions(+), 19 deletions(-)
>
> Acked-by: Rob Herring <rob.herring@...xeda.com>

Ok, I keep that in mind until all other issues are resolved.

Thanks,
   Sebastian

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