dts: arm: st: add pllsai2 node for stm32l4 series 7 and upper

Add a disabled node describing the PLLSAI2 pll available from
stm32l47* and upper.

Signed-off-by: Alain Volmat <[email protected]>

Author: Alain Volmat

dts/arm/st/l4/stm32l471.dtsi

@@ -7,6 +7,14 @@
 #include <st/l4/stm32l4.dtsi>
 
 / {
+	clocks {
+		pllsai2: pllsai2 {
+			#clock-cells = <0>;
+			compatible = "st,stm32l4-pllsai-clock";
+			status = "disabled";
+		};
+	};
+
 	soc {
 		compatible = "st,stm32l471", "st,stm32l4", "simple-bus";
 

dts/arm/st/l4/stm32l4p5.dtsi

@@ -30,6 +30,12 @@
 			clock-frequency = <DT_FREQ_M(48)>;
 			status = "disabled";
 		};
+
+		pllsai2: pllsai2 {
+			#clock-cells = <0>;
+			compatible = "st,stm32l4-pllsai-clock";
+			status = "disabled";
+		};
 	};
 
 	soc {