linux-kernel - Re: [PATCH v5 2/6] dt-bindings: add mtk-timer bindings

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Date:	Wed, 21 May 2014 18:54:20 +0200
From:	Heiko Stübner <heiko.stuebner@...com>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	linux-kernel@...r.kernel.org, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	rdunlap@...radead.org, linux@....linux.org.uk,
	daniel.lezcano@...aro.org, tglx@...utronix.de,
	thierry.reding@...il.com, florian.vaussard@...l.ch,
	jic23@...nel.org, jason@...edaemon.net, andrew@...n.ch,
	silvio.fricke@...il.com, olof@...om.net,
	sebastian.hesselbarth@...il.com, sboyd@...eaurora.org,
	gregory.clement@...e-electrons.com, arnd@...db.de,
	robherring2@...il.com, marc.zyngier@....com,
	maxime.ripard@...e-electrons.com, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 2/6] dt-bindings: add mtk-timer bindings

Am Mittwoch, 21. Mai 2014, 09:34:10 schrieb Sören Brinkmann:
> Hi Matthias,
> 
> On Wed, 2014-05-21 at 06:26PM +0200, Matthias Brugger wrote:
> > Add binding documentation for the General Porpose Timer driver of
> 
> Typo: Purpose
> 
> > the Mediatek SoCs.
> > 
> > Signed-off-by: Matthias Brugger <matthias.bgg@...il.com>
> > ---
> > 
> >  .../devicetree/bindings/timer/mediatek,mtk-timer.txt   | 18
> >  ++++++++++++++++++ 1 file changed, 18 insertions(+)
> >  create mode 100644
> >  Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt> 
> > diff --git
> > a/Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt
> > b/Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt new file
> > mode 100644
> > index 0000000..7d909f7
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt
> > @@ -0,0 +1,18 @@
> > +Mediatek MT6577, MT6572 and MT6589 Timers
> > +---------------------------------------
> > +
> > +Required properties:
> > +- compatible: Should be "mediatek,mtk6577-timer"
> > +- reg: Should contain location and length for timers register.
> > +- clocks: Clocks driving the timer hardware. This list shoud include two
> > +	clocks. The order is system clock and as second clock the RTC clock.
> > +
> > +Examples:
> > +
> > +	timer {
> 
> The node name should be timer@...0008000

I think the more commonly used variant is

	timer@...08000

without the 0x. While some dts files really use @0x they are in the minority.


> 
> > +		compatible = "mediatek,mtk6577-timer";
> > +		reg = <0x10008000 0x80>;
> > +		interrupts = <GIC_SPI 113 IRQ_TYPE_LEVEL_LOW>;
> > +		clocks = <&system_clk>, <&rtc_clk>;
> > +		clock-names = "system-clk", "rtc-clk";
> 
> I'm still not convinced that the timer IP calls its clock inputs this
> way, but well.

Maybe this might convince you ;-)

"The GPT includes 5 32-bit timers and one 64-bit timer. Each timer has 4 
operation modes, which are ONE-SHOT,  REPEAT,  KEEP-GO and  FREERUN, and can 
operate on one of the 2 clock sources, RTC clock (32.768kHz) and system clock 
(13MHz)."


Heiko
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