Support CPU frequency scaling on Apple M1 SoC.

Signed-off-by: Stan Skowronek <stan@corellium.com>
corellium · Jan 22, 2021 · 857454e · 857454e
1 parent 749dc1e
commit 857454e
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Showing 4 changed files with 370 additions and 4 deletions.
diff --git a/arch/arm64/boot/dts/apple/apple-m1-j274.dts b/arch/arm64/boot/dts/apple/apple-m1-j274.dts
@@ -86,28 +86,28 @@
             enable-method = "apple,startcpu";
         };
 
-        cpu@4 {
+        cpu@0x10100 {
             device_type = "cpu";
             compatible = "apple,v1";
             reg = <0x10100>;
             enable-method = "apple,startcpu";
         };
 
-        cpu@5 {
+        cpu@0x10101 {
             device_type = "cpu";
             compatible = "apple,v1";
             reg = <0x10101>;
             enable-method = "apple,startcpu";
         };
 
-        cpu@6 {
+        cpu@0x10102 {
             device_type = "cpu";
             compatible = "apple,v1";
             reg = <0x10102>;
             enable-method = "apple,startcpu";
         };
 
-        cpu@7 {
+        cpu@0x10103 {
             device_type = "cpu";
             compatible = "apple,v1";
             reg = <0x10103>;
@@ -153,6 +153,11 @@
                    0x2 0x3b754004 0x0 0xc   0x2 0x11350000 0x0 0x8   0x2 0x11330fb0 0x0 0x4>;
         };
 
+        cpufreq: cpufreq@210e00000 {
+            compatible = "apple,pmgr-cpufreq-m1";
+            reg = <0x2 0x10e00000 0x0 0x100000   0x2 0x11e00000 0x0 0x100000   0x2 0x3b700000 0x0 0x100000>;
+        };
+
         aic: interrupt-controller@23b100000 {
             compatible = "apple,aic";
             #interrupt-cells = <3>;

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
@@ -31,6 +31,12 @@ config ARM_ALLWINNER_SUN50I_CPUFREQ_NVMEM
 	  To compile this driver as a module, choose M here: the
 	  module will be called sun50i-cpufreq-nvmem.
 
+config ARM_APPLE_M1_CPUFREQ
+	tristate "Apple M1 CPU power state driver"
+	depends on ARCH_APPLE
+	help
+	  This add the CPUFreq driver support for Apple M1 SoC.
+
 config ARM_ARMADA_37XX_CPUFREQ
 	tristate "Armada 37xx CPUFreq support"
 	depends on ARCH_MVEBU && CPUFREQ_DT

diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_X86_SFI_CPUFREQ)		+= sfi-cpufreq.o
 
 ##################################################################################
 # ARM SoC drivers
+obj-$(CONFIG_ARM_APPLE_M1_CPUFREQ)	+= apple-m1-cpufreq.o
 obj-$(CONFIG_ARM_ARMADA_37XX_CPUFREQ)	+= armada-37xx-cpufreq.o
 obj-$(CONFIG_ARM_ARMADA_8K_CPUFREQ)	+= armada-8k-cpufreq.o
 obj-$(CONFIG_ARM_BRCMSTB_AVS_CPUFREQ)	+= brcmstb-avs-cpufreq.o