linux-kernel - [PATCH v1 10/10] arm64: dts: qcom: ipq9574: populate the opp table based on the eFuse

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Message-ID: <1512a94f8fe1f8fe22cef2bf8498a6ac27989633.1693996662.git.quic_varada@quicinc.com>
Date:   Thu, 7 Sep 2023 10:51:45 +0530
From:   Varadarajan Narayanan <quic_varada@...cinc.com>
To:     <ilia.lin@...nel.org>, <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <rafael@...nel.org>,
        <viresh.kumar@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <mturquette@...libre.com>, <sboyd@...nel.org>,
        <quic_kathirav@...cinc.com>, <linux-pm@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>
CC:     Varadarajan Narayanan <quic_varada@...cinc.com>
Subject: [PATCH v1 10/10] arm64: dts: qcom: ipq9574: populate the opp table based on the eFuse

IPQ95xx SoCs have different OPPs available for the CPU based on
SoC variant. This can be determined from an eFuse register
present in the silicon.

Add support to read the eFuse and populate the OPPs based on it.

Signed-off-by: Kathiravan T <quic_kathirav@...cinc.com>
Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
---
 arch/arm64/boot/dts/qcom/ipq9574.dtsi | 38 ++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
index 89edb4b..ad6f1c6 100644
--- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
@@ -106,42 +106,73 @@
 	};
 
 	cpu_opp_table: opp-table-cpu {
-		compatible = "operating-points-v2";
+		compatible = "operating-points-v2-kryo-cpu";
 		opp-shared;
+		nvmem-cells = <&cpu_speed_bin>;
+		nvmem-cell-names = "speed_bin";
+
+		/* Listed all supported CPU frequencies and opp-supported-hw
+		 * values to select CPU frequencies based on the limits fused.
+		 * ------------------------------------------------------------
+		 * Frequency     BIT3   BIT2   BIT1    BIT0    opp-supported-hw
+		 *              1.2GHz 1.5GHz 1.8GHz No Limit
+		 * ------------------------------------------------------------
+		 * 936000000      1      1      1       1            0xF
+		 * 1104000000     1      1      1       1            0xF
+		 * 1200000000     1      0      0       0            0x8
+		 * 1416000000     0      1      1       1            0x7
+		 * 1488000000     0      1      0       0            0x4
+		 * 1800000000     0      0      1       1            0x3
+		 * 2208000000     0      0      0       1            0x1
+		 * -----------------------------------------------------------
+		 */
 
 		opp-936000000 {
 			opp-hz = /bits/ 64 <936000000>;
 			opp-microvolt = <725000>;
+			opp-supported-hw = <0xf>;
 			clock-latency-ns = <200000>;
 		};
 
 		opp-1104000000 {
 			opp-hz = /bits/ 64 <1104000000>;
 			opp-microvolt = <787500>;
+			opp-supported-hw = <0xf>;
+			clock-latency-ns = <200000>;
+		};
+
+		opp-1200000000 {
+			opp-hz = /bits/ 64 <1200000000>;
+			opp-microvolt = <862500>;
+			opp-supported-hw = <0x8>;
 			clock-latency-ns = <200000>;
 		};
 
 		opp-1416000000 {
 			opp-hz = /bits/ 64 <1416000000>;
 			opp-microvolt = <862500>;
+			opp-supported-hw = <0x7>;
 			clock-latency-ns = <200000>;
 		};
 
 		opp-1488000000 {
 			opp-hz = /bits/ 64 <1488000000>;
 			opp-microvolt = <925000>;
+			opp-supported-hw = <0x7>;
 			clock-latency-ns = <200000>;
 		};
 
 		opp-1800000000 {
 			opp-hz = /bits/ 64 <1800000000>;
 			opp-microvolt = <987500>;
+			opp-supported-hw = <0x3>;
 			clock-latency-ns = <200000>;
 		};
 
 		opp-2208000000 {
 			opp-hz = /bits/ 64 <2208000000>;
 			opp-microvolt = <1062500>;
+			opp-supported-hw = <0x1>;
 			clock-latency-ns = <200000>;
 		};
 	};
@@ -223,6 +254,11 @@
 			reg = <0x000a4000 0x5a1>;
 			#address-cells = <1>;
 			#size-cells = <1>;
+
+			cpu_speed_bin: cpu_speed_bin@15 {
+				reg = <0x15 0x2>;
+				bits = <7 2>;
+			};
 		};
 
 		cryptobam: dma-controller@...000 {
-- 
2.7.4