linux-kernel - Re: [PATCH v5 06/17] clk: at91: add PMC pll clocks

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Date:	Thu, 28 Nov 2013 09:34:10 +0100
From:	boris brezillon <b.brezillon@...rkiz.com>
To:	Mike Turquette <mturquette@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Andrew Victor <linux@...im.org.za>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Russell King <linux@....linux.org.uk>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Josh Wu <josh.wu@...el.com>,
	Richard Genoud <richard.genoud@...il.com>
CC:	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH v5 06/17] clk: at91: add PMC pll clocks

Hi Mike,

On 27/11/2013 22:48, Mike Turquette wrote:
> Quoting Boris BREZILLON (2013-11-12 13:57:19)
>> +static const struct clk_ops pll_ops = {
>> +       .prepare = clk_pll_prepare,
>> +       .is_prepared = clk_pll_is_ready,
>> +       .disable = clk_pll_disable,
>> +       .is_enabled = clk_pll_is_ready,
>> +       .recalc_rate = clk_pll_recalc_rate,
>> +       .round_rate = clk_pll_round_rate,
>> +       .set_rate = clk_pll_set_rate,
>> +};
> Hi Boris,
>
> It is a bit strange to see only a .prepare and .disable callback
> populated. What happens if a driver calls clk_disable and then
> clk_enable? You clock will still be disabled in hardware.

Oops, I haven't thought about that.
I did this because the clk_pll_disable does not sleep, but this is a big 
mistake :-(.

I'll fix this.

Thanks.

Best Regards,

Boris
> Regards,
> Mike

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