linux-kernel - Re: [PATCH 1/2] dt-bindings: Add mtk-systimer bindings

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Message-ID: <1529994984.17448.27.camel@mtkswgap22>
Date:   Tue, 26 Jun 2018 14:36:24 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>
Subject: Re: [PATCH 1/2] dt-bindings: Add mtk-systimer bindings

On Mon, 2018-06-25 at 23:53 +0200, Daniel Lezcano wrote:
> On 25/06/2018 09:10, Stanley Chu wrote:
> > Add binding documentation for the System Timer driver of
> > the Mediatek SoCs.
> > 
> > Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
> > ---
> >  .../bindings/timer/mediatek,mtk-systimer.txt       |   18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/timer/mediatek,mtk-systimer.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/timer/mediatek,mtk-systimer.txt b/Documentation/devicetree/bindings/timer/mediatek,mtk-systimer.txt
> > new file mode 100644
> > index 0000000..735a6fd
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/timer/mediatek,mtk-systimer.txt
> > @@ -0,0 +1,18 @@
> > +Mediatek System Timers
> > +----------------------
> > +
> > +Required properties:
> > +- compatible: should contain
> > +	"mediatek,sys_timer" for those platforms which support system timer.
> > +- reg: Mandatory. The location and length for system timer registers.
> > +- clock-frequency: Optional. If not assigned specifically, default
> > +	value 13000000 (means 13 MHz) would be applied.
> 
> The driver tells there is an error if it is not defined, so it can't be
> optional.
> 
> > +Examples:
> > +
> > +	sys_timer@...17000 {
> > +		compatible = "mediatek,sys_timer";
> > +		reg = <0 0x10017000 0 0x1000>;
> > +		interrupts = <GIC_SPI 194 IRQ_TYPE_LEVEL_HIGH>;
> > +		clock-frequency = <13000000>;
> 
> Replace it by a phandle to a 'fixed-clock'.
> 
> eg.
> 
> clocks = <&myclk>;
> 
> 
> > +	};
> 
> myclk: myclk {
> 	#clock-cells = <0>;
> 	compatible = "fixed-clock";
>         clock-frequency = <13000000>;
> };
> 
> Thanks
> 
>   -- DAniel
> 
> 
> 
> 
Hi Daniel,

13 MHz clock is necessary. We will fix it in v2 by using system's
fixed-clock.

Thanks.
Stanley Chu