linux-kernel - Re: [PATCH v3 5/8] rtc: ac100: Add clk output support

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Message-ID: <20160627192321.GX4000@lukather>
Date:	Mon, 27 Jun 2016 21:23:21 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Mark Brown <broonie@...nel.org>, Lee Jones <lee.jones@...aro.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.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>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	rtc-linux@...glegroups.com,
	linux-kernel <linux-kernel@...r.kernel.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v3 5/8] rtc: ac100: Add clk output support

On Wed, Jun 22, 2016 at 06:11:55PM +0800, Chen-Yu Tsai wrote:
> On Wed, Jun 22, 2016 at 6:02 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > Hi,
> >
> > On Mon, Jun 20, 2016 at 10:52:15AM +0800, Chen-Yu Tsai wrote:
> >> +     /*
> >> +      * The ADDA 4 MHz clock is from the codec side of the AC100,
> >> +      * which is likely a different power domain. However, boards
> >> +      * always have both sides powered on, so it is impossible to
> >> +      * test this.
> >> +      */
> >
> > If that ADDA clock is exposed by the codec, why are you putting it in
> > the RTC?
> 
> The thing is it's not entirely clear that it's from the codec side.
> I'm just inferring this from the name. (I'll make the comment clearer.)
> The codec parts of the datasheet don't mention this clock at all.
> 
> Allwinner's SDK puts all the clocks under the RTC module. And the
> are always on, so I can't really turn off the codec and see what
> happens. That and I don't have an oscilloscope or logic analyzer.

Why not just create a separate clock driver then?

Thanks,
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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