[RFC PATCH v3 3/3] riscv: dts: allwinner: Fill in OPPs

[Brandon Cheo Fusi]

Specify two voltage ranges, in order of increasing stability,
for each OPP.

Also define an nvmem cpu speed grade cell of length 2.

Link: https://github.com/Tina-Linux/linux-5.4/blob/master/arch/riscv/boot/dts/sunxi/sun20iw1p1.dtsi#L118-L133
Link: https://github.com/mangopi-sbc/tina-linux-5.4/blob/0d4903ebd9d2194ad914686d5b0fc1ddacf11a9d/arch/riscv/boot/dts/sunxi/sun20iw1p1.dtsi#L118-L182

Signed-off-by: Brandon Cheo Fusi <fusibrandon13 at gmail.com>
---
 arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
index 64c3c2e6c..7e2e015e0 100644
--- a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
+++ b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
@@ -39,16 +39,23 @@ cpu0_intc: interrupt-controller {
 	};
 
 	opp_table_cpu: opp-table-cpu {
-		compatible = "operating-points-v2";
+		compatible = "allwinner,sun20i-d1-operating-points";
+		nvmem-cells = <&cpu_speed_grade>;
+		nvmem-cell-names = "speed";
+		opp-shared;
 
 		opp-408000000 {
 			opp-hz = /bits/ 64 <408000000>;
-			opp-microvolt = <900000 900000 1100000>;
+
+			opp-microvolt-speed0 = <950000 950000 1100000>;
+			opp-microvolt-speed1 = <900000 900000 1100000>;
 		};
 
 		opp-1080000000 {
 			opp-hz = /bits/ 64 <1008000000>;
-			opp-microvolt = <900000 900000 1100000>;
+
+			opp-microvolt-speed0 = <1100000>;
+			opp-microvolt-speed1 = <950000 950000 1100000>;
 		};
 	};
 
@@ -115,3 +122,9 @@ pmu {
 			<0x00000000 0x0000000f 0xffffffff 0xffffffff 0x00020000>;
 	};
 };
+
+&sid {
+	cpu_speed_grade: cpu-speed-grade at 0 {
+		reg = <0x00 0x2>;
+	};
+};
-- 
2.30.2