Add cpufreq nodes for Apple A10 SoC. There is a transparent hardware
big.LITTLE switcher in this SoC. Spoof E-core p-state frequencies such
that CPU capacity does not appear to change when switching between core
types.
Signed-off-by: Nick Chan <towinchenmi@xxxxxxxxx>
---
arch/arm64/boot/dts/apple/t8011.dtsi | 79 ++++++++++++++++++++++++++++
1 file changed, 79 insertions(+)
diff --git a/arch/arm64/boot/dts/apple/t8011.dtsi b/arch/arm64/boot/dts/apple/t8011.dtsi
index 6c4ed9dc4a50..3a3d5b615a6a 100644
--- a/arch/arm64/boot/dts/apple/t8011.dtsi
+++ b/arch/arm64/boot/dts/apple/t8011.dtsi
@@ -32,6 +32,8 @@ cpu0: cpu@0 {
compatible = "apple,hurricane-zephyr";
reg = <0x0 0x0>;
cpu-release-addr = <0 0>; /* To be filled by loader */
+ operating-points-v2 = <&fusion_opp>;
+ performance-domains = <&cpufreq>;
enable-method = "spin-table";
device_type = "cpu";
};
@@ -40,6 +42,8 @@ cpu1: cpu@1 {
compatible = "apple,hurricane-zephyr";
reg = <0x0 0x1>;
cpu-release-addr = <0 0>; /* To be filled by loader */
+ operating-points-v2 = <&fusion_opp>;
+ performance-domains = <&cpufreq>;
enable-method = "spin-table";
device_type = "cpu";
};
@@ -48,11 +52,80 @@ cpu2: cpu@2 {
compatible = "apple,hurricane-zephyr";
reg = <0x0 0x2>;
cpu-release-addr = <0 0>; /* To be filled by loader */
+ operating-points-v2 = <&fusion_opp>;
+ performance-domains = <&cpufreq>;
enable-method = "spin-table";
device_type = "cpu";
};
};
+ fusion_opp: opp-table {
+ compatible = "operating-points-v2";
+
+ /*
+ * Apple Fusion Architecture: Hardwired big.LITTLE switcher
+ * that use p-state transitions to switch between cores.
+ *
+ * The E-core frequencies are adjusted so performance scales
+ * linearly with reported clock speed.
+ */
+
+ opp01 {
+ opp-hz = /bits/ 64 <172000000>; /* 300 MHz, E-core */
+ opp-level = <1>;
+ clock-latency-ns = <12000>;
+ };
+ opp02 {
+ opp-hz = /bits/ 64 <230000000>; /* 396 MHz, E-core */
+ opp-level = <2>;
+ clock-latency-ns = <135000>;
+ };
+ opp03 {
+ opp-hz = /bits/ 64 <448000000>; /* 768 MHz, E-core */
+ opp-level = <3>;
+ clock-latency-ns = <105000>;
+ };
+ opp04 {
+ opp-hz = /bits/ 64 <662000000>; /* 1152 MHz, E-core */
+ opp-level = <4>;
+ clock-latency-ns = <115000>;
+ };
+ opp05 {
+ opp-hz = /bits/ 64 <804000000>;
+ opp-level = <5>;
+ clock-latency-ns = <122000>;
+ };
+ opp06 {
+ opp-hz = /bits/ 64 <1140000000>;
+ opp-level = <6>;
+ clock-latency-ns = <120000>;
+ };
+ opp07 {
+ opp-hz = /bits/ 64 <1548000000>;
+ opp-level = <7>;
+ clock-latency-ns = <125000>;
+ };
+ opp08 {
+ opp-hz = /bits/ 64 <1956000000>;
+ opp-level = <8>;
+ clock-latency-ns = <135000>;
+ };
+ opp09 {
+ opp-hz = /bits/ 64 <2316000000>;
+ opp-level = <9>;
+ clock-latency-ns = <140000>;
+ };
+#if 0
+ /* Not available until CPU deep sleep is implemented */
+ opp10 {
+ opp-hz = /bits/ 64 <2400000000>;
+ opp-level = <10>;
+ clock-latency-ns = <140000>;
+ turbo-mode;
+ };
+#endif
+ };
+
soc {
compatible = "simple-bus";
#address-cells = <2>;
@@ -60,6 +133,12 @@ soc {
nonposted-mmio;
ranges;
+ cpufreq: performance-controller@202f20000 {
+ compatible = "apple,t8010-cluster-cpufreq", "apple,t8103-cluster-cpufreq", "apple,cluster-cpufreq";
+ reg = <0x2 0x02f20000 0 0x1000>;
+ #performance-domain-cells = <0>;
+ };
+
serial0: serial@20a0c0000 {
compatible = "apple,s5l-uart";
reg = <0x2 0x0a0c0000 0x0 0x4000>;
--
2.47.1
