[Linux-stm32] [PATCH] arm64: dts: st: add PSCI idle state to STM32MP23 CPU domains

[Patrick Delaunay]

Define a PSCI CPU suspend state and reference it from both STM32MP23
CPU power domains.

In OSI mode, PSCI power domains are initialized as off. The idle-state
allows the CPU power-domain governor to manage them, avoiding probe
stalls for devices that depend on the cluster power domain, including
SDMMC1.

Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
---

 arch/arm64/boot/dts/st/stm32mp231.dtsi | 14 ++++++++++++++
 arch/arm64/boot/dts/st/stm32mp233.dtsi |  1 +
 2 files changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/st/stm32mp231.dtsi b/arch/arm64/boot/dts/st/stm32mp231.dtsi
index fefbf6f4f153..27231e140fbb 100644
--- a/arch/arm64/boot/dts/st/stm32mp231.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp231.dtsi
@@ -24,6 +24,19 @@ cpu0: cpu at 0 {
 			power-domains = <&cpu0_pd>;
 			power-domain-names = "psci";
 		};
+
+		idle-states {
+			entry-method = "psci";
+
+			cpu_sleep: cpu-sleep {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x00000002>;
+				local-timer-stop;
+				entry-latency-us = <150>;
+				exit-latency-us = <200>;
+				min-residency-us = <1000>;
+			};
+		};
 	};
 
 	arm-pmu {
@@ -123,6 +136,7 @@ psci {
 
 		cpu0_pd: power-domain-cpu0 {
 			#power-domain-cells = <0>;
+			domain-idle-states = <&cpu_sleep>;
 			power-domains = <&cluster_pd>;
 		};
 
diff --git a/arch/arm64/boot/dts/st/stm32mp233.dtsi b/arch/arm64/boot/dts/st/stm32mp233.dtsi
index 78f4059fca5d..cebefd99906f 100644
--- a/arch/arm64/boot/dts/st/stm32mp233.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp233.dtsi
@@ -26,6 +26,7 @@ arm-pmu {
 	psci {
 		cpu1_pd: power-domain-cpu1 {
 			#power-domain-cells = <0>;
+			domain-idle-states = <&cpu_sleep>;
 			power-domains = <&cluster_pd>;
 		};
 	};
---
base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
branch: master

-- 
2.43.0