[PATCH v2 3/3] arm64: dts: allwinner: a523: add GPU OPP table

["Juan Manuel López Carrillo" <juanmanuellopezcarrillo@gmail.com>]

Add the Mali-G57 operating points from the vendor BSP universal table
(150/200/300/400/600 MHz) so panfrost devfreq can scale the GPU instead
of running at the boot clock.

The table describes the SoC rather than any particular board, so it
lives in the .dtsi and is referenced from the GPU node there; every
A523/T527 board in tree already provides mali-supply.

The BSP universal table specifies 900 mV for all of these operating
points, so that is the target and minimum voltage.  The maximum is set
to 920 mV to also cover boards whose GPU rail is a fixed 920 mV supply
(the Orange Pi 4A drives it from AXP717 DCDC2, fixed at 920 mV), where
the voltage transitions are then no-ops.

The higher speed-bin points of the BSP (648-792 MHz) are not included:
they are gated by a SID efuse bin and need pll-gpu as a live parent.

Depends on the sun55i-a523 GPU clock divider fix: the OPP rates are only
produced correctly with the cycle-masking divider model.  Validated on
hardware with the Mali cycle counter: 149/199/300/399/597 MHz measured
under load, thermal-emulation throttling included.

Signed-off-by: Juan Manuel López Carrillo <juanmanuellopezcarrillo@gmail.com>
---
 .../arm64/boot/dts/allwinner/sun55i-a523.dtsi | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi
index 85ef492ffeae..a3164b5dd609 100644
--- a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi
@@ -85,6 +85,35 @@ osc24M: osc24M-clk {
 		clock-output-names = "osc24M";
 	};
 
+	gpu_opp_table: opp-table-gpu {
+		compatible = "operating-points-v2";
+
+		opp-150000000 {
+			opp-hz = /bits/ 64 <150000000>;
+			opp-microvolt = <900000 900000 920000>;
+		};
+
+		opp-200000000 {
+			opp-hz = /bits/ 64 <200000000>;
+			opp-microvolt = <900000 900000 920000>;
+		};
+
+		opp-300000000 {
+			opp-hz = /bits/ 64 <300000000>;
+			opp-microvolt = <900000 900000 920000>;
+		};
+
+		opp-400000000 {
+			opp-hz = /bits/ 64 <400000000>;
+			opp-microvolt = <900000 900000 920000>;
+		};
+
+		opp-600000000 {
+			opp-hz = /bits/ 64 <600000000>;
+			opp-microvolt = <900000 900000 920000>;
+		};
+	};
+
 	pmu {
 		compatible = "arm,cortex-a55-pmu";
 		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
@@ -121,6 +150,7 @@ gpu: gpu@1800000 {
 			interrupt-names = "job", "mmu", "gpu";
 			clocks = <&ccu CLK_GPU>, <&ccu CLK_BUS_GPU>;
 			clock-names = "core", "bus";
+			operating-points-v2 = <&gpu_opp_table>;
 			power-domains = <&pck600 PD_GPU>;
 			resets = <&ccu RST_BUS_GPU>;
 			status = "disabled";
-- 
2.47.3