From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: Re: [PATCH 1/2] dt-bindings: Add mtk-systimer bindings
Date: Mon, 25 Jun 2018 23:53:45 +0200
Message-ID: <ad38a952-4400-984a-a7fd-aa4e6af13c13@linaro.org>
References: <1529910601-15005-1-git-send-email-stanley.chu@mediatek.com>
 <1529910601-15005-2-git-send-email-stanley.chu@mediatek.com>
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To: Stanley Chu <stanley.chu@mediatek.com>, Matthias Brugger <matthias.bgg@gmail.com>, Thomas Gleixner <tglx@linutronix.de>, Rob Herring <robh+dt@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org, wsd_upstream@mediatek.com
List-Id: devicetree@vger.kernel.org

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@mediatek.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@10017000 {
> +		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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