linux-kernel - Re: [PATCH 5/7] ARM: dts: imx6ul: add ARM architected timer

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Date:   Tue, 9 Jan 2018 17:34:22 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Stefan Agner <stefan@...er.ch>
Cc:     shawnguo@...nel.org, kernel@...gutronix.de, fabio.estevam@....com,
        robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-imx@....com
Subject: Re: [PATCH 5/7] ARM: dts: imx6ul: add ARM architected timer

Hi Stefan,

On Tue, Jan 02, 2018 at 05:42:21PM +0100, Stefan Agner wrote:
> Add per-core ARM architected timer. Unfortunately bootloaders (U-Boot)
> currently do not make the necessary initialization. Also specifing the
> clock manually using the clock-frequency property seems not to help.
> Therefor leave the timer disabled by default for now.
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>

Any special purpose to use arch timer?

Regards
Dong Aisheng

> ---
>  arch/arm/boot/dts/imx6ul.dtsi | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx6ul.dtsi b/arch/arm/boot/dts/imx6ul.dtsi
> index 993fbdbdd506..4d76923e8f44 100644
> --- a/arch/arm/boot/dts/imx6ul.dtsi
> +++ b/arch/arm/boot/dts/imx6ul.dtsi
> @@ -110,6 +110,16 @@
>  		      <0x00a06000 0x2000>;
>  	};
>  
> +	timer {
> +		compatible = "arm,armv7-timer";
> +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> +		interrupt-parent = <&intc>;
> +		status = "disabled";
> +	};
> +
>  	ckil: clock-cli {
>  		compatible = "fixed-clock";
>  		#clock-cells = <0>;
> -- 
> 2.15.1
>