dts/arm/st: stm32h7: Add perck clock-mux node

Add perck clock-mux node as disabled by default and
the include bindings helping to select it.

Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

dts/arm/st/h7/stm32h7.dtsi

@@ -90,6 +90,12 @@
 			reg = <2>;
 			status = "disabled";
 		};
+
+		perck: perck {
+			#clock-cells = <0>;
+			compatible = "st,stm32-clock-mux";
+			status = "disabled";
+		};
 	};
 
 	soc {

include/drivers/clock_control/stm32_clock_control.h

@@ -198,6 +198,10 @@
 #define STM32_HSE_FREQ		0
 #endif
 
+#if DT_NODE_HAS_COMPAT_STATUS(DT_NODELABEL(perck), st_stm32_clock_mux, okay)
+#define STM32_CKPER_ENABLED	1
+#endif
+
 /** Driver structure definition */
 
 struct stm32_pclken {

include/dt-bindings/clock/stm32h7_clock.h

@@ -27,15 +27,15 @@
 #define STM32_SRC_LSI		0x00C
 /** Oscillators not yet supported */
 /* #define STM32_SRC_HSI48	0x00D */
-/* #define STM32_SRC_HSI_KER	0x00E */ /* HSI + HSIKERON */
-/* #define STM32_SRC_CSI_KER	0x00F */ /* CSI + CSIKERON */
+#define STM32_SRC_HSI_KER	0x00E /* HSI + HSIKERON */
+#define STM32_SRC_CSI_KER	0x00F /* CSI + CSIKERON */
 /** Core clock */
 #define STM32_SRC_SYSCLK	0x010
 /** Others: Not yet supported */
 /* #define STM32_SRC_I2SCKIN	0x011 */
 /* #define STM32_SRC_SPDIFRX	0x012 */
 /** Clock muxes */
-/* #define STM32_SRC_PER	0x013 */
+#define STM32_SRC_CKPER		0x013
 
 #define STM32_SRC_CLOCK_MIN	STM32_SRC_PLL1_P
 #define STM32_SRC_CLOCK_MAX	STM32_SRC_CKPER