[PATCH v1 4/4] arm64: dts: allwinner: t527-orangepi-4a: add GPU OPP table

[Juan Manuel López Carrillo]

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.

All operating points use 920 mV: the BSP table specifies 900 mV for
every universal OPP, but on this board the GPU rail (AXP717 DCDC2,
vdd-gpu-sys) is a fixed 920 mV supply, so the OPP voltage states the
actual rail value and voltage transitions are 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@xxxxxxxxx>
---
 .../dts/allwinner/sun55i-t527-orangepi-4a.dts | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts b/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts
index 055be86e5..0fd73a1bb 100644
--- a/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts
+++ b/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts
@@ -30,6 +30,35 @@ ext_osc32k: ext-osc32k-clk {
 		clock-output-names = "ext_osc32k";
 	};
 
+	gpu_opp_table: opp-table-gpu {
+		compatible = "operating-points-v2";
+
+		opp-150000000 {
+			opp-hz = /bits/ 64 <150000000>;
+			opp-microvolt = <920000>;
+		};
+
+		opp-200000000 {
+			opp-hz = /bits/ 64 <200000000>;
+			opp-microvolt = <920000>;
+		};
+
+		opp-300000000 {
+			opp-hz = /bits/ 64 <300000000>;
+			opp-microvolt = <920000>;
+		};
+
+		opp-400000000 {
+			opp-hz = /bits/ 64 <400000000>;
+			opp-microvolt = <920000>;
+		};
+
+		opp-600000000 {
+			opp-hz = /bits/ 64 <600000000>;
+			opp-microvolt = <920000>;
+		};
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -116,6 +145,7 @@ &gmac1 {
 
 &gpu {
 	mali-supply = <&reg_dcdc2>;
+	operating-points-v2 = <&gpu_opp_table>;
 	status = "okay";
 };
 
-- 
2.47.3