ARM: dts: qcom: msm8226: Add CPU frequency scaling support

Add a node for the a7pll with its frequencies. With this we can use the
apcs-kpss-global driver for the apcs node and use the apcs to scale the
CPU frequency according to the opp-table.

At the same time unfortunately we need to provide the gcc node xo_board
instead of the XO via rpmcc since otherwise we'll have a circular
dependency between apcs, gcc and the rpm.

Signed-off-by: Luca Weiss <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

1 files changed, 100 insertions, 3 deletions

diff --git a/arch/arm/boot/dts/qcom/qcom-msm8226.dtsi b/arch/arm/boot/dts/qcom/qcom-msm8226.dtsi
index b2f92ad6499a..f0086000be3c 100644
--- a/arch/arm/boot/dts/qcom/qcom-msm8226.dtsi
+++ b/arch/arm/boot/dts/qcom/qcom-msm8226.dtsi
@@ -44,6 +44,8 @@
 			device_type = "cpu";
 			reg = <0>;
 			next-level-cache = <&L2>;
+			clocks = <&apcs>;
+			operating-points-v2 = <&cpu_opp_table>;
 			qcom,acc = <&acc0>;
 			qcom,saw = <&saw0>;
 		};
@@ -54,6 +56,8 @@
 			device_type = "cpu";
 			reg = <1>;
 			next-level-cache = <&L2>;
+			clocks = <&apcs>;
+			operating-points-v2 = <&cpu_opp_table>;
 			qcom,acc = <&acc1>;
 			qcom,saw = <&saw1>;
 		};
@@ -64,6 +68,8 @@
 			device_type = "cpu";
 			reg = <2>;
 			next-level-cache = <&L2>;
+			clocks = <&apcs>;
+			operating-points-v2 = <&cpu_opp_table>;
 			qcom,acc = <&acc2>;
 			qcom,saw = <&saw2>;
 		};
@@ -74,6 +80,8 @@
 			device_type = "cpu";
 			reg = <3>;
 			next-level-cache = <&L2>;
+			clocks = <&apcs>;
+			operating-points-v2 = <&cpu_opp_table>;
 			qcom,acc = <&acc3>;
 			qcom,saw = <&saw3>;
 		};
@@ -98,6 +106,29 @@
 		reg = <0x0 0x0>;
 	};
 
+	cpu_opp_table: opp-table-cpu {
+		compatible = "operating-points-v2";
+		opp-shared;
+
+		opp-300000000 {
+			opp-hz = /bits/ 64 <300000000>;
+		};
+
+		opp-384000000 {
+			opp-hz = /bits/ 64 <384000000>;
+		};
+
+		opp-600000000 {
+			opp-hz = /bits/ 64 <600000000>;
+		};
+
+		opp-787200000 {
+			opp-hz = /bits/ 64 <787200000>;
+		};
+
+		/* Higher CPU frequencies need speedbin support */
+	};
+
 	pmu {
 		compatible = "arm,cortex-a7-pmu";
 		interrupts = <GIC_PPI 7 (GIC_CPU_MASK_SIMPLE(4) |
@@ -231,9 +262,75 @@
 			#interrupt-cells = <3>;
 		};
 
-		apcs: syscon@f9011000 {
-			compatible = "syscon";
+		apcs: mailbox@f9011000 {
+			compatible = "qcom,msm8226-apcs-kpss-global",
+				     "qcom,msm8916-apcs-kpss-global", "syscon";
 			reg = <0xf9011000 0x1000>;
+			#mbox-cells = <1>;
+			clocks = <&a7pll>, <&gcc GPLL0_VOTE>;
+			clock-names = "pll", "aux";
+			#clock-cells = <0>;
+		};
+
+		a7pll: clock@f9016000 {
+			compatible = "qcom,msm8226-a7pll";
+			reg = <0xf9016000 0x40>;
+			#clock-cells = <0>;
+			clocks = <&xo_board>;
+			clock-names = "xo";
+			operating-points-v2 = <&a7pll_opp_table>;
+
+			a7pll_opp_table: opp-table {
+				compatible = "operating-points-v2";
+
+				opp-768000000 {
+					opp-hz = /bits/ 64 <768000000>;
+				};
+
+				opp-787200000 {
+					opp-hz = /bits/ 64 <787200000>;
+				};
+
+				opp-998400000 {
+					opp-hz = /bits/ 64 <998400000>;
+				};
+
+				opp-1094400000 {
+					opp-hz = /bits/ 64 <1094400000>;
+				};
+
+				opp-1190400000 {
+					opp-hz = /bits/ 64 <1190400000>;
+				};
+
+				opp-1305600000 {
+					opp-hz = /bits/ 64 <1305600000>;
+				};
+
+				opp-1344000000 {
+					opp-hz = /bits/ 64 <1344000000>;
+				};
+
+				opp-1401600000 {
+					opp-hz = /bits/ 64 <1401600000>;
+				};
+
+				opp-1497600000 {
+					opp-hz = /bits/ 64 <1497600000>;
+				};
+
+				opp-1593600000 {
+					opp-hz = /bits/ 64 <1593600000>;
+				};
+
+				opp-1689600000 {
+					opp-hz = /bits/ 64 <1689600000>;
+				};
+
+				opp-1785600000 {
+					opp-hz = /bits/ 64 <1785600000>;
+				};
+			};
 		};
 
 		saw_l2: power-manager@f9012000 {
@@ -571,7 +668,7 @@
 			#reset-cells = <1>;
 			#power-domain-cells = <1>;
 
-			clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
+			clocks = <&xo_board>,
 				 <&sleep_clk>;
 			clock-names = "xo",
 				      "sleep_clk";