linux-kernel - Re: [PATCH 4/4] clk: si5351: Reset PLL after rate change

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Message-ID: <55427B42.9060902@gmail.com>
Date:	Thu, 30 Apr 2015 20:58:10 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Michael Welling <mwelling@...e.org>
CC:	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Jean-Francois Moine <moinejf@...e.fr>,
	Russell King <rmk+linux@....linux.org.uk>,
	devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] clk: si5351: Reset PLL after rate change

On 30.04.2015 20:49, Michael Welling wrote:
> On Thu, Apr 30, 2015 at 07:45:54PM +0200, Sebastian Hesselbarth wrote:
>> When changing PLL rate significantly, PLLs have to be reset. Add a function
>> to perform and check for successful PLL reset.
>>
>> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
>> ---
[...]
>> @@ -519,6 +545,9 @@ static int si5351_pll_set_rate(struct clk_hw *hw, unsigned long rate,
>>   		SI5351_CLK_INTEGER_MODE,
>>   		(hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0);
>>
>> +	/* reset pll after rate change */
>> +	si5351_pll_reset(hwdata);
>> +
>
> What is the point of having a return code if it is not being used?

Good point, I'll pass that on to the return value of .set_rate()
callback for v2.

Sebastian

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