Merge tag 'juno-updates-6.16' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into soc/dt

Armv8 Juno/FVP updates for v6.16

Few updates to the Arm FVP(Fixed Virtual Platform) device tree, enhancing
support for system tracing, power management, and firmware coexistence:

1. ETE and TRBE support
   Adds CoreSight ETE and TRBE nodes for the FVP Rev C model. These are
   disabled by default as they need to be enabled explicitly via model
   parameters.

2. CPU idle states and system timer for idle broadcast
   Introduces CPU idle state definitions but disabled by default due to
   potential performance impact on the model. Also adds a system-level
   broadcast timer for use when CPUs enter deep idle states where local
   timers stop.

3. Firmware memory reservation
   Reserves 64MB at the end of the first DRAM bank to prevent conflicts
   with FF-A firmware or similar configurations that rely on this region.

4. Drop the unnecessary clock-frequency property in the timer nodes
   The boot/secure firmware must configure the timer clock frequency and
   the non-secure OS must be able to read the same. The clock-frequency is
   generally used when the firmware is broken which is not the case on
   most of the fast models and Juno platform.

As noted above some of the changes are disabled by default where applicable
to ensure backward compatibility and avoid unintended performance impact
on platforms using default model parameters.

* tag 'juno-updates-6.16' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  arm64: dts: fvp: Add ETE and TRBE nodes for Rev C model
  arm64: dts: arm: Drop the clock-frequency property from timer nodes
  arm64: dts: fvp: Reserve 64MB for the FF-A firmware in memory map
  arm64: dts: fvp: Add CPU idle states for Rev C model
  arm64: dts: fvp: Add system timer for broadcast during CPU idle

Link: https://lore.kernel.org/r/20250513143827.3606686-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

5 files changed, 100 insertions, 5 deletions

diff --git a/arch/arm64/boot/dts/arm/corstone1000.dtsi b/arch/arm64/boot/dts/arm/corstone1000.dtsi
index 56ada8728b60..f35a5c96f3da 100644
--- a/arch/arm64/boot/dts/arm/corstone1000.dtsi
+++ b/arch/arm64/boot/dts/arm/corstone1000.dtsi
@@ -109,7 +109,6 @@
 			reg = <0x1a220000 0x1000>;
 			#address-cells = <1>;
 			#size-cells = <1>;
-			clock-frequency = <50000000>;
 			ranges;
 
 			frame@1a230000 {
diff --git a/arch/arm64/boot/dts/arm/foundation-v8.dtsi b/arch/arm64/boot/dts/arm/foundation-v8.dtsi
index 083be35495b3..a4b2b78d4df3 100644
--- a/arch/arm64/boot/dts/arm/foundation-v8.dtsi
+++ b/arch/arm64/boot/dts/arm/foundation-v8.dtsi
@@ -77,7 +77,6 @@
 			     <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)>;
-		clock-frequency = <100000000>;
 	};
 
 	pmu {
diff --git a/arch/arm64/boot/dts/arm/fvp-base-revc.dts b/arch/arm64/boot/dts/arm/fvp-base-revc.dts
index 9e10d7a6b5a2..68a69f17e93d 100644
--- a/arch/arm64/boot/dts/arm/fvp-base-revc.dts
+++ b/arch/arm64/boot/dts/arm/fvp-base-revc.dts
@@ -44,6 +44,30 @@
 		#address-cells = <2>;
 		#size-cells = <0>;
 
+		idle-states {
+			entry-method = "psci";
+
+			CPU_SLEEP_0: cpu-sleep-0 {
+				compatible = "arm,idle-state";
+				local-timer-stop;
+				arm,psci-suspend-param = <0x0010000>;
+				entry-latency-us = <40>;
+				exit-latency-us = <100>;
+				min-residency-us = <150>;
+				status = "disabled";
+			};
+
+			CLUSTER_SLEEP_0: cluster-sleep-0 {
+				compatible = "arm,idle-state";
+				local-timer-stop;
+				arm,psci-suspend-param = <0x1010000>;
+				entry-latency-us = <500>;
+				exit-latency-us = <1000>;
+				min-residency-us = <2500>;
+				status = "disabled";
+			};
+		};
+
 		cpu0: cpu@0 {
 			device_type = "cpu";
 			compatible = "arm,armv8";
@@ -56,6 +80,7 @@
 			d-cache-line-size = <64>;
 			d-cache-sets = <256>;
 			next-level-cache = <&C0_L2>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 		cpu1: cpu@100 {
 			device_type = "cpu";
@@ -69,6 +94,7 @@
 			d-cache-line-size = <64>;
 			d-cache-sets = <256>;
 			next-level-cache = <&C0_L2>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 		cpu2: cpu@200 {
 			device_type = "cpu";
@@ -82,6 +108,7 @@
 			d-cache-line-size = <64>;
 			d-cache-sets = <256>;
 			next-level-cache = <&C0_L2>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 		cpu3: cpu@300 {
 			device_type = "cpu";
@@ -95,6 +122,7 @@
 			d-cache-line-size = <64>;
 			d-cache-sets = <256>;
 			next-level-cache = <&C0_L2>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 		cpu4: cpu@10000 {
 			device_type = "cpu";
@@ -108,6 +136,7 @@
 			d-cache-line-size = <64>;
 			d-cache-sets = <256>;
 			next-level-cache = <&C1_L2>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 		cpu5: cpu@10100 {
 			device_type = "cpu";
@@ -121,6 +150,7 @@
 			d-cache-line-size = <64>;
 			d-cache-sets = <256>;
 			next-level-cache = <&C1_L2>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 		cpu6: cpu@10200 {
 			device_type = "cpu";
@@ -134,6 +164,7 @@
 			d-cache-line-size = <64>;
 			d-cache-sets = <256>;
 			next-level-cache = <&C1_L2>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 		cpu7: cpu@10300 {
 			device_type = "cpu";
@@ -147,6 +178,7 @@
 			d-cache-line-size = <64>;
 			d-cache-sets = <256>;
 			next-level-cache = <&C1_L2>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 		C0_L2: l2-cache0 {
 			compatible = "cache";
@@ -169,7 +201,7 @@
 
 	memory@80000000 {
 		device_type = "memory";
-		reg = <0x00000000 0x80000000 0 0x80000000>,
+		reg = <0x00000000 0x80000000 0 0x7c000000>,
 		      <0x00000008 0x80000000 0 0x80000000>;
 	};
 
@@ -217,6 +249,19 @@
 			     <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
 	};
 
+	timer@2a810000 {
+		compatible = "arm,armv7-timer-mem";
+		reg = <0x0 0x2a810000 0x0 0x10000>;
+		ranges = <0 0x0 0x2a820000 0x20000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		frame@2a830000 {
+			frame-number = <1>;
+			interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
+			reg = <0x10000 0x10000>;
+		};
+	};
+
 	pmu {
 		compatible = "arm,armv8-pmuv3";
 		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
@@ -227,6 +272,60 @@
 		interrupts = <GIC_PPI 5 IRQ_TYPE_LEVEL_HIGH>;
 	};
 
+	ete-0 {
+		compatible = "arm,embedded-trace-extension";
+		cpu = <&cpu0>;
+		status = "disabled";
+	};
+
+	ete-1 {
+		compatible = "arm,embedded-trace-extension";
+		cpu = <&cpu1>;
+		status = "disabled";
+	};
+
+	ete-2 {
+		compatible = "arm,embedded-trace-extension";
+		cpu = <&cpu2>;
+		status = "disabled";
+	};
+
+	ete-3 {
+		compatible = "arm,embedded-trace-extension";
+		cpu = <&cpu3>;
+		status = "disabled";
+	};
+
+	ete-4 {
+		compatible = "arm,embedded-trace-extension";
+		cpu = <&cpu4>;
+		status = "disabled";
+	};
+
+	ete-5 {
+		compatible = "arm,embedded-trace-extension";
+		cpu = <&cpu5>;
+		status = "disabled";
+	};
+
+	ete-6 {
+		compatible = "arm,embedded-trace-extension";
+		cpu = <&cpu6>;
+		status = "disabled";
+	};
+
+	ete-7 {
+		compatible = "arm,embedded-trace-extension";
+		cpu = <&cpu7>;
+		status = "disabled";
+	};
+
+	trbe {
+		compatible = "arm,trace-buffer-extension";
+		interrupts = <GIC_PPI 15 IRQ_TYPE_LEVEL_LOW>;
+		status = "disabled";
+	};
+
 	pci: pci@40000000 {
 		#address-cells = <0x3>;
 		#size-cells = <0x2>;
diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi
index 055764d0b9e5..9ccb80821bdb 100644
--- a/arch/arm64/boot/dts/arm/juno-base.dtsi
+++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
@@ -10,7 +10,6 @@
 	memtimer: timer@2a810000 {
 		compatible = "arm,armv7-timer-mem";
 		reg = <0x0 0x2a810000 0x0 0x10000>;
-		clock-frequency = <50000000>;
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0 0x0 0x2a820000 0x20000>;
diff --git a/arch/arm64/boot/dts/arm/rtsm_ve-aemv8a.dts b/arch/arm64/boot/dts/arm/rtsm_ve-aemv8a.dts
index 7f7226711d4b..a4a29193d4eb 100644
--- a/arch/arm64/boot/dts/arm/rtsm_ve-aemv8a.dts
+++ b/arch/arm64/boot/dts/arm/rtsm_ve-aemv8a.dts
@@ -116,7 +116,6 @@
 			     <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)>;
-		clock-frequency = <100000000>;
 	};
 
 	pmu {