linux-kernel - Re: [PATCH 1/6] ASoC: max98088: Document DT bindings

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Date:	Mon, 23 Feb 2015 17:46:17 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Andreas Färber 
	<afaerber@...e.de>
CC:	Doug Anderson <dianders@...omium.org>, alsa-devel@...a-project.org,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Sangbeom Kim <sbkim73@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Vincent Palatin <vpalatin@...omium.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH 1/6] ASoC: max98088: Document DT bindings

Hello Sylwester,

On 02/20/2015 01:12 PM, Sylwester Nawrocki wrote:
> On 20/02/15 01:36, Andreas Färber wrote:
>>>> >> So it seems the mclk is not always set up properly by the kernel,
>>>> >> relying on firmware. Who's in charge of setting that clock up?
>>> > 
>>> > Right, it seems audio is only working due the firmware doing some previous
>>> > setup. Probably it works on every boot if you have "sound init" as a part of
>>> > the u-boot boot commands?
>>
>> Indeed it does, 24 MHz without the reparenting patch, and sound working.
> 
> You can have parent of the CLKOUT clock set by the clk core if it is
> specified in device tree in the PMU (the clkout clock supplier) device
> node.
> 
> Similarly as we did for the Odroix U3:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/exynos4412-odroid-common.dtsi#n39
> 
> Relying on the clk_set_rate() to set the parent clock is not optimal
> IMO. Presumably you need to set select stable parent clock for clkout
> like XXTI. But I'm not very familiar with exyno5250 and that might be
> something different.
> 

Thanks a lot for your suggestion. I'll drop Tushar's patch to allow
clkout to be reparent during set_rate then and change his DTS patch
to set a default parent for CLKOUT using "assigned-clock-parents".

Best regards,
Javier
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