linux-kernel - Re: [PATCH 1/2] clk: divider: don't set_rate with CLK_DIVIDER_READ

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Date:	Fri, 15 May 2015 10:52:54 +0900
From:	Joonyoung Shim <jy0922.shim@...sung.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
	mturquette@...aro.org, haojian.zhuang@...il.com,
	james.hogan@...tec.com
Subject: Re: [PATCH 1/2] clk: divider: don't set_rate with
 CLK_DIVIDER_READ_ONLY flag

Hi Stephen,

On 05/13/2015 08:59 AM, Stephen Boyd wrote:
> On 04/07, Joonyoung Shim wrote:
>> Even if use CLK_DIVIDER_READ_ONLY flag, divider setting can be changed
>> by set_rate callback. Don't change divider setting from set_rate
>> callback of divider with CLK_DIVIDER_READ_ONLY flag.
>>
>> Signed-off-by: Joonyoung Shim <jy0922.shim@...sung.com>
>> ---
> 
> Is the rate actually changing? Or is it just a problem that we
> may be writing the register to the same value it already is?
> 

If rate and parant_rate are different, it can write the register to
different value. Even if the value is same but i think it's unnecessary
to re-write the register.

Thanks.
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