linux-kernel - Re: [PATCH v2 1/2] dt-bindings: Add mtk-systimer bindings

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Date:   Wed, 27 Jun 2018 10:20:38 +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 v2 1/2] dt-bindings: Add mtk-systimer bindings

On 27/06/2018 09:53, 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..7a5bde6
> --- /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: Should contain the location and length for system timer registers.
> +- clocks: System timer is drived by system clock.
> +
> +Examples:
> +
> +	sys_timer@...17000 {
> +		compatible = "mediatek,sys_timer";
> +		reg = <0 0x10017000 0 0x1000>;
> +		interrupts = <GIC_SPI 194 IRQ_TYPE_LEVEL_HIGH>;
> +		clocks = <&sys_clk>;
> +	};
> +

Actually this binding already exists for mediatek timers, it is useless
to add a new one.

I note the binding in

Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt

contains:

 clocks = <&system_clk>, <&rtc_clk>

However the existing driver does only use <&system_clk> AFAICT, I'm
questioning if <&rtc_clk> is really needed.

So, I suggest you sort out and fixup the rtc_clk thing (drop it) and
then just add your new platform in the list in this binding.


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