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

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Date:   Mon, 25 Jun 2018 23:53:45 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Stanley Chu <stanley.chu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>
Cc:     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 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




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