linux-kernel - Re: [PATCH V2 5/5] arm64: dts: qcom: ipq5332: enable the CPUFreq support

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Date:   Wed, 8 Feb 2023 09:41:43 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Kathiravan T <quic_kathirav@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        jassisinghbrar@...il.com, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     quic_varada@...cinc.com, quic_srichara@...cinc.com
Subject: Re: [PATCH V2 5/5] arm64: dts: qcom: ipq5332: enable the CPUFreq
 support



On 8.02.2023 05:28, Kathiravan T wrote:
> Add the APCS, A53 PLL, cpu-opp-table nodes to bump the CPU frequency
> above 800MHz.
> 
> Signed-off-by: Kathiravan T <quic_kathirav@...cinc.com>
> ---
> Changes in V2:
> 	- No changes
> 
>  arch/arm64/boot/dts/qcom/ipq5332.dtsi | 37 +++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq5332.dtsi b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> index bdf33ef30e10..cec2828c51f8 100644
> --- a/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> @@ -5,6 +5,7 @@
>   * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
>   */
>  
> +#include <dt-bindings/clock/qcom,apss-ipq.h>
>  #include <dt-bindings/clock/qcom,ipq5332-gcc.h>
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  
> @@ -35,6 +36,8 @@
>  			reg = <0x0>;
>  			enable-method = "psci";
>  			next-level-cache = <&L2_0>;
> +			clocks = <&apcs_glb APCS_ALIAS0_CORE_CLK>;
> +			operating-points-v2 = <&cpu_opp_table>;
>  		};
>  
>  		CPU1: cpu@1 {
> @@ -43,6 +46,8 @@
>  			reg = <0x1>;
>  			enable-method = "psci";
>  			next-level-cache = <&L2_0>;
> +			clocks = <&apcs_glb APCS_ALIAS0_CORE_CLK>;
> +			operating-points-v2 = <&cpu_opp_table>;
>  		};
>  
>  		CPU2: cpu@2 {
> @@ -51,6 +56,8 @@
>  			reg = <0x2>;
>  			enable-method = "psci";
>  			next-level-cache = <&L2_0>;
> +			clocks = <&apcs_glb APCS_ALIAS0_CORE_CLK>;
> +			operating-points-v2 = <&cpu_opp_table>;
>  		};
>  
>  		CPU3: cpu@3 {
> @@ -59,6 +66,8 @@
>  			reg = <0x3>;
>  			enable-method = "psci";
>  			next-level-cache = <&L2_0>;
> +			clocks = <&apcs_glb APCS_ALIAS0_CORE_CLK>;
> +			operating-points-v2 = <&cpu_opp_table>;
>  		};
>  
>  		L2_0: l2-cache {
> @@ -67,6 +76,16 @@
>  		};
>  	};
>  
> +	cpu_opp_table: opp-table-cpu{
opp-table-cpu {
+ sort this properly (by node name, not label), please

> +		compatible = "operating-points-v2";
> +		opp-shared;
> +
> +		opp-1488000000 {
Why only one (presumably FMAX) target? This sounds
very destructive to power consumption, and by extension
heat output.

The other changes generally look good fwiw.

Konrad
> +			opp-hz = /bits/ 64 <1488000000>;
> +			clock-latency-ns = <200000>;
> +		};
> +	};
> +
>  	firmware {
>  		scm {
>  			compatible = "qcom,scm-ipq5332", "qcom,scm";
> @@ -199,6 +218,24 @@
>  			};
>  		};
>  
> +		apcs_glb: mailbox@...1000 {
> +			compatible = "qcom,ipq5332-apcs-apps-global",
> +				     "qcom,ipq6018-apcs-apps-global";
> +			reg = <0x0b111000 0x1000>;
> +			#clock-cells = <1>;
> +			clocks = <&a53pll>, <&xo_board>;
> +			clock-names = "pll", "xo";
> +			#mbox-cells = <1>;
> +		};
> +
> +		a53pll: clock@...6000 {
> +			compatible = "qcom,ipq5332-a53pll";
> +			reg = <0x0b116000 0x40>;
> +			#clock-cells = <0>;
> +			clocks = <&xo_board>;
> +			clock-names = "xo";
> +		};
> +
>  		timer@...0000 {
>  			compatible = "arm,armv7-timer-mem";
>  			reg = <0x0b120000 0x1000>;