arm64: dts: st: add spi3/spi8 pins for stm32mp25

Add the spi3 and spi8 pins used on STM32MP257F-EV1 board.
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm64/boot/dts/st/stm32mp25-pinctrl.dtsi

@@ -77,6 +77,28 @@ pins {
 		};
 	};
 
+	spi3_pins_a: spi3-0 {
+		pins1 {
+			pinmux = <STM32_PINMUX('B', 7, AF1)>, /* SPI3_SCK */
+				 <STM32_PINMUX('B', 8, AF1)>; /* SPI3_MOSI */
+			drive-push-pull;
+			bias-disable;
+			slew-rate = <1>;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('B', 10, AF1)>; /* SPI3_MISO */
+			bias-disable;
+		};
+	};
+
+	spi3_sleep_pins_a: spi3-sleep-0 {
+		pins1 {
+			pinmux = <STM32_PINMUX('B', 7, ANALOG)>, /* SPI3_SCK */
+				 <STM32_PINMUX('B', 8, ANALOG)>, /* SPI3_MOSI */
+				 <STM32_PINMUX('B', 10, ANALOG)>; /* SPI3_MISO */
+		};
+	};
+
 	usart2_pins_a: usart2-0 {
 		pins1 {
 			pinmux = <STM32_PINMUX('A', 4, AF6)>; /* USART2_TX */
@@ -126,3 +148,27 @@ pins {
 		};
 	};
 };
+
+&pinctrl_z {
+	spi8_pins_a: spi8-0 {
+		pins1 {
+			pinmux = <STM32_PINMUX('Z', 2, AF3)>, /* SPI8_SCK */
+				 <STM32_PINMUX('Z', 0, AF3)>; /* SPI8_MOSI */
+			drive-push-pull;
+			bias-disable;
+			slew-rate = <1>;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('Z', 1, AF3)>; /* SPI8_MISO */
+			bias-disable;
+		};
+	};
+
+	spi8_sleep_pins_a: spi8-sleep-0 {
+		pins1 {
+			pinmux = <STM32_PINMUX('Z', 2, ANALOG)>, /* SPI8_SCK */
+				 <STM32_PINMUX('Z', 0, ANALOG)>, /* SPI8_MOSI */
+				 <STM32_PINMUX('Z', 1, ANALOG)>; /* SPI8_MISO */
+		};
+	};
+};