[PATCH RFC 6/6] arm64: dts: apple: t8103: Add PSCI and CPU idle states
From: Sven Peter <sven@kernel.org>
Date: 2026-07-08 07:16:02
Also in:
asahi, b4-sent, linux-devicetree, linux-efi, lkml
Subsystem:
arm/apple machine support, the rest · Maintainers:
Sven Peter, Janne Grunau, Linus Torvalds
Switch the base M1 from spin-table to PSCI and also add two basic idle states that we support for now. Signed-off-by: Sven Peter <sven@kernel.org> --- arch/arm64/boot/dts/apple/t8103.dtsi | 51 ++++++++++++++++++++++++++++++------ 1 file changed, 43 insertions(+), 8 deletions(-)
diff --git a/arch/arm64/boot/dts/apple/t8103.dtsi b/arch/arm64/boot/dts/apple/t8103.dtsi
index da774096b667..3dbcaa698a90 100644
--- a/arch/arm64/boot/dts/apple/t8103.dtsi
+++ b/arch/arm64/boot/dts/apple/t8103.dtsi@@ -24,6 +24,11 @@ aliases { gpu = &gpu; }; + psci { + compatible = "arm,psci-1.0"; + method = "efi"; + }; + cpus { #address-cells = <2>; #size-cells = <0>;
@@ -64,7 +69,8 @@ cpu_e0: cpu@0 { compatible = "apple,icestorm"; device_type = "cpu"; reg = <0x0 0x0>; - enable-method = "spin-table"; + enable-method = "psci"; + cpu-idle-states = <&cpu_retention_wfi &cpu_deep_wfi>; cpu-release-addr = <0 0>; /* To be filled by loader */ operating-points-v2 = <&ecluster_opp>; capacity-dmips-mhz = <714>;
@@ -78,7 +84,8 @@ cpu_e1: cpu@1 { compatible = "apple,icestorm"; device_type = "cpu"; reg = <0x0 0x1>; - enable-method = "spin-table"; + enable-method = "psci"; + cpu-idle-states = <&cpu_retention_wfi &cpu_deep_wfi>; cpu-release-addr = <0 0>; /* To be filled by loader */ operating-points-v2 = <&ecluster_opp>; capacity-dmips-mhz = <714>;
@@ -92,7 +99,8 @@ cpu_e2: cpu@2 { compatible = "apple,icestorm"; device_type = "cpu"; reg = <0x0 0x2>; - enable-method = "spin-table"; + enable-method = "psci"; + cpu-idle-states = <&cpu_retention_wfi &cpu_deep_wfi>; cpu-release-addr = <0 0>; /* To be filled by loader */ operating-points-v2 = <&ecluster_opp>; capacity-dmips-mhz = <714>;
@@ -106,7 +114,8 @@ cpu_e3: cpu@3 { compatible = "apple,icestorm"; device_type = "cpu"; reg = <0x0 0x3>; - enable-method = "spin-table"; + enable-method = "psci"; + cpu-idle-states = <&cpu_retention_wfi &cpu_deep_wfi>; cpu-release-addr = <0 0>; /* To be filled by loader */ operating-points-v2 = <&ecluster_opp>; capacity-dmips-mhz = <714>;
@@ -120,7 +129,8 @@ cpu_p0: cpu@10100 { compatible = "apple,firestorm"; device_type = "cpu"; reg = <0x0 0x10100>; - enable-method = "spin-table"; + enable-method = "psci"; + cpu-idle-states = <&cpu_retention_wfi &cpu_deep_wfi>; cpu-release-addr = <0 0>; /* To be filled by loader */ operating-points-v2 = <&pcluster_opp>; capacity-dmips-mhz = <1024>;
@@ -134,7 +144,8 @@ cpu_p1: cpu@10101 { compatible = "apple,firestorm"; device_type = "cpu"; reg = <0x0 0x10101>; - enable-method = "spin-table"; + enable-method = "psci"; + cpu-idle-states = <&cpu_retention_wfi &cpu_deep_wfi>; cpu-release-addr = <0 0>; /* To be filled by loader */ operating-points-v2 = <&pcluster_opp>; capacity-dmips-mhz = <1024>;
@@ -148,7 +159,8 @@ cpu_p2: cpu@10102 { compatible = "apple,firestorm"; device_type = "cpu"; reg = <0x0 0x10102>; - enable-method = "spin-table"; + enable-method = "psci"; + cpu-idle-states = <&cpu_retention_wfi &cpu_deep_wfi>; cpu-release-addr = <0 0>; /* To be filled by loader */ operating-points-v2 = <&pcluster_opp>; capacity-dmips-mhz = <1024>;
@@ -162,7 +174,8 @@ cpu_p3: cpu@10103 { compatible = "apple,firestorm"; device_type = "cpu"; reg = <0x0 0x10103>; - enable-method = "spin-table"; + enable-method = "psci"; + cpu-idle-states = <&cpu_retention_wfi &cpu_deep_wfi>; cpu-release-addr = <0 0>; /* To be filled by loader */ operating-points-v2 = <&pcluster_opp>; capacity-dmips-mhz = <1024>;
@@ -185,6 +198,28 @@ l2_cache_1: l2-cache-1 { cache-unified; cache-size = <0xc00000>; }; + + idle-states { + entry-method = "psci"; + + cpu_retention_wfi: cpu-retention-wfi { + compatible = "arm,idle-state"; + idle-state-name = "wfi"; + arm,psci-suspend-param = <0x00000000>; + entry-latency-us = <1>; + exit-latency-us = <1>; + min-residency-us = <1>; + }; + + cpu_deep_wfi: cpu-deep-wfi { + compatible = "arm,idle-state"; + idle-state-name = "deep-wfi"; + arm,psci-suspend-param = <0x00000001>; + entry-latency-us = <5>; + exit-latency-us = <5>; + min-residency-us = <10000>; + }; + }; }; ecluster_opp: opp-table-0 {
--
2.55.0