linux-kernel - [PATCH] arm64: dts: ti: k3-j722s: add OPP table

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Message-Id: <20250922131105.2670932-1-mwalle@kernel.org>
Date: Mon, 22 Sep 2025 15:11:05 +0200
From: Michael Walle <mwalle@...nel.org>
To: Nishanth Menon <nm@...com>,
	Bryan Brattlof <bb@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Michael Walle <mwalle@...nel.org>
Subject: [PATCH] arm64: dts: ti: k3-j722s: add OPP table

Add the A53 frequency operation points. The frequencies where taken from
the AM62P SoC and seem to be chosen rather arbitrary.
The SoC doesn't contain it's speed grade in the JTAG USER ID efuse
register, thus it has to be hardcoded in the SoC dtsi and/or board dts.

The SoC is binned into just two speed grades with different core
voltages: J (0.75V, 1.25GHz) and K (0.85V, 1.4GHz). Add the frequencies
that both speed grades support to the SoC dtsi and if a board has a
speed grade K SoC add it to the board device tree.

Signed-off-by: Michael Walle <mwalle@...nel.org>
---
 .../arm64/boot/dts/ti/k3-am67a-beagley-ai.dts |  7 ++++
 arch/arm64/boot/dts/ti/k3-j722s-evm.dts       |  7 ++++
 arch/arm64/boot/dts/ti/k3-j722s.dtsi          | 40 +++++++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts b/arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts
index b697035df04e..464dffd46e59 100644
--- a/arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts
+++ b/arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts
@@ -148,6 +148,13 @@ led-1 {
 	};
 };
 
+&a53_opp_table {
+	opp-1400000000 {
+		opp-hz = /bits/ 64 <1400000000>;
+		clock-latency-ns = <6000000>;
+	};
+};
+
 &main_pmx0 {
 	main_i2c0_pins_default: main-i2c0-default-pins {
 		pinctrl-single,pins = <
diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
index e0e303da7e15..ce3ed1b0f24d 100644
--- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
@@ -228,6 +228,13 @@ csi23_mux: mux-controller-1 {
 	};
 };
 
+&a53_opp_table {
+	opp-1400000000 {
+		opp-hz = /bits/ 64 <1400000000>;
+		clock-latency-ns = <6000000>;
+	};
+};
+
 &cpsw_mac_syscon {
 	bootph-all;
 };
diff --git a/arch/arm64/boot/dts/ti/k3-j722s.dtsi b/arch/arm64/boot/dts/ti/k3-j722s.dtsi
index 0165db6e4437..acb15307addc 100644
--- a/arch/arm64/boot/dts/ti/k3-j722s.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j722s.dtsi
@@ -55,6 +55,7 @@ cpu0: cpu@0 {
 			d-cache-line-size = <64>;
 			d-cache-sets = <128>;
 			next-level-cache = <&l2_0>;
+			operating-points-v2 = <&a53_opp_table>;
 			clocks = <&k3_clks 135 0>;
 			#cooling-cells = <2>;
 		};
@@ -71,6 +72,7 @@ cpu1: cpu@1 {
 			d-cache-line-size = <64>;
 			d-cache-sets = <128>;
 			next-level-cache = <&l2_0>;
+			operating-points-v2 = <&a53_opp_table>;
 			clocks = <&k3_clks 136 0>;
 			#cooling-cells = <2>;
 		};
@@ -87,6 +89,7 @@ cpu2: cpu@2 {
 			d-cache-line-size = <64>;
 			d-cache-sets = <128>;
 			next-level-cache = <&l2_0>;
+			operating-points-v2 = <&a53_opp_table>;
 			clocks = <&k3_clks 137 0>;
 			#cooling-cells = <2>;
 		};
@@ -103,11 +106,48 @@ cpu3: cpu@3 {
 			d-cache-line-size = <64>;
 			d-cache-sets = <128>;
 			next-level-cache = <&l2_0>;
+			operating-points-v2 = <&a53_opp_table>;
 			clocks = <&k3_clks 138 0>;
 			#cooling-cells = <2>;
 		};
 	};
 
+	a53_opp_table: opp-table {
+		compatible = "operating-points-v2";
+		opp-shared;
+
+		opp-200000000 {
+			opp-hz = /bits/ 64 <200000000>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-400000000 {
+			opp-hz = /bits/ 64 <400000000>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-600000000 {
+			opp-hz = /bits/ 64 <600000000>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-800000000 {
+			opp-hz = /bits/ 64 <800000000>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-1000000000 {
+			opp-hz = /bits/ 64 <1000000000>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-1250000000 {
+			opp-hz = /bits/ 64 <1250000000>;
+			clock-latency-ns = <6000000>;
+			opp-suspend;
+		};
+	};
+
 	l2_0: l2-cache0 {
 		compatible = "cache";
 		cache-unified;
-- 
2.39.5