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Date:   Thu, 14 Feb 2019 12:42:33 +0530
From:   Viresh Kumar <viresh.kumar@linaro.org>
To:     Anson Huang <anson.huang@nxp.com>
Cc:     "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "mark.rutland@arm.com" <mark.rutland@arm.com>,
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        "mturquette@baylibre.com" <mturquette@baylibre.com>,
        "sboyd@kernel.org" <sboyd@kernel.org>,
        Aisheng Dong <aisheng.dong@nxp.com>,
        Daniel Baluta <daniel.baluta@nxp.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
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        <linux-arm-kernel@lists.infradead.org>,
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Subject: Re: [PATCH V4 1/2] arm64: dts: freescale: imx8qxp: add cpu opp table
Message-ID: <20190214071233.7uypqihkfasxqyw6@vireshk-i7>
References: <1550108915-574-1-git-send-email-Anson.Huang@nxp.com>
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On 14-02-19, 01:54, Anson Huang wrote:
> Add i.MX8QXP CPU opp table to support cpufreq.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> ---
> No change since V3.
> ---
>  arch/arm64/boot/dts/freescale/imx8qxp.dtsi | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> index 4021f25..593e2db 100644
> --- a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> @@ -34,6 +34,10 @@
>  			reg = <0x0 0x0>;
>  			enable-method = "psci";
>  			next-level-cache = <&A35_L2>;
> +			clocks = <&clk IMX_A35_CLK>;
> +			clock-latency = <61036>;

Who uses this value ? And why is it different from the one mentioned
in the OPP table ?

> +			#cooling-cells = <2>;

clocks and cooling-cells must be defined for all the CPUs.

> +			operating-points-v2 = <&a35_0_opp_table>;
>  		};
>  
>  		A35_1: cpu@1 {
> @@ -42,6 +46,7 @@
>  			reg = <0x0 0x1>;
>  			enable-method = "psci";
>  			next-level-cache = <&A35_L2>;
> +			operating-points-v2 = <&a35_0_opp_table>;
>  		};
>  
>  		A35_2: cpu@2 {
> @@ -50,6 +55,7 @@
>  			reg = <0x0 0x2>;
>  			enable-method = "psci";
>  			next-level-cache = <&A35_L2>;
> +			operating-points-v2 = <&a35_0_opp_table>;
>  		};
>  
>  		A35_3: cpu@3 {
> @@ -58,6 +64,7 @@
>  			reg = <0x0 0x3>;
>  			enable-method = "psci";
>  			next-level-cache = <&A35_L2>;
> +			operating-points-v2 = <&a35_0_opp_table>;
>  		};
>  
>  		A35_L2: l2-cache0 {
> @@ -65,6 +72,24 @@
>  		};
>  	};
>  
> +	a35_0_opp_table: opp-table {
> +		compatible = "operating-points-v2";
> +		opp-shared;
> +
> +		opp-900000000 {
> +			opp-hz = /bits/ 64 <900000000>;
> +			opp-microvolt = <1000000>;
> +			clock-latency-ns = <150000>;
> +		};
> +
> +		opp-1200000000 {
> +			opp-hz = /bits/ 64 <1200000000>;
> +			opp-microvolt = <1100000>;
> +			clock-latency-ns = <150000>;
> +			opp-suspend;

You want to go to a higher frequency on suspend ?

> +		};
> +	};
> +
>  	gic: interrupt-controller@51a00000 {
>  		compatible = "arm,gic-v3";
>  		reg = <0x0 0x51a00000 0 0x10000>, /* GIC Dist */
> -- 
> 2.7.4

-- 
viresh