boards: st: nucleo_u385rg_q: change arduino_spi to spi1

According to user manual(UM3062, table 16), arduino_spi is connected
to spi1 instead of spi3.

Enable spi1 node and affect the SPI_NSS pin with I/O function
to do the chip select.

Remove i2c3 to avoid conflict with PA7 pin.

Move the status property of dac1 node to maintain consistency
in the ordering of node properties.

NB: The SPI_NSS pin is not listed as an alternate function
for SPI1 in the user manual (UM3062, Table 17).

Signed-off-by: Ulrich KAMDEM <kamdemulricharmel@gmail.com>

Author: ulrich-a11-y

boards/st/nucleo_u385rg_q/arduino_r3_connector.dtsi

@@ -39,6 +39,6 @@
 
 arduino_i2c: &i2c1 {};
 
-arduino_spi: &spi3 {};
+arduino_spi: &spi1 {};
 
 arduino_serial: &lpuart1 {};

boards/st/nucleo_u385rg_q/nucleo_u385rg_q.dts

@@ -145,9 +145,9 @@
 };
 
 &dac1 {
-	status = "okay";
 	pinctrl-0 = <&dac1_out1_pa4>;
 	pinctrl-names = "default";
+	status = "okay";
 };
 
 &fdcan1 {
@@ -168,18 +168,25 @@
 	status = "okay";
 };
 
-&i2c3 {
-	pinctrl-0 = <&i2c3_scl_pa7 &i2c3_sda_pc1>;
-	pinctrl-names = "default";
-	status = "okay";
-};
-
 &rng {
 	clocks = <&rcc STM32_CLOCK(AHB2, 18)>,
 		 <&rcc STM32_SRC_MSIK RNG_SEL(1)>;
 	status = "okay";
 };
 
+&spi1 {
+	pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6
+		     &spi1_mosi_pa7>;
+	pinctrl-names = "default";
+
+	/* Arduino D10 (SPI_NSS) is wired to PC9 which
+	 * doesn't support hardware NSS; the software
+	 * cs-gpios must be used instead.
+	 */
+	cs-gpios = <&gpioc 9 GPIO_ACTIVE_LOW>;
+	status = "okay";
+};
+
 &spi3 {
 	pinctrl-0 = <&spi3_nss_pa15 &spi3_sck_pb3
 		     &spi3_miso_pb4 &spi3_mosi_pb5>;