boards: nxp: frdm_mcxn947: enable flexcan0

Enable FlexCAN0 on the NXP FRDM-MCXN947 board.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>

boards/nxp/frdm_mcxn947/board.c

@@ -106,6 +106,25 @@ static int frdm_mcxn947_init(void)
 
 	CLOCK_SetupExtClocking(BOARD_XTAL0_CLK_HZ);
 
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(flexcan0), okay)
+	/* Set up PLL1 for 80 MHz FlexCAN clock */
+	const pll_setup_t pll1Setup = {
+		.pllctrl = SCG_SPLLCTRL_SOURCE(1U) | SCG_SPLLCTRL_SELI(27U) |
+			   SCG_SPLLCTRL_SELP(13U),
+		.pllndiv = SCG_SPLLNDIV_NDIV(3U),
+		.pllpdiv = SCG_SPLLPDIV_PDIV(1U),
+		.pllmdiv = SCG_SPLLMDIV_MDIV(10U),
+		.pllRate = 80000000U
+	};
+
+	/* Configure PLL1 to the desired values */
+	CLOCK_SetPLL1Freq(&pll1Setup);
+	/* PLL1 Monitor is disabled */
+	CLOCK_SetPll1MonitorMode(kSCG_Pll1MonitorDisable);
+	/* Set PLL1 CLK0 divider to value 1 */
+	CLOCK_SetClkDiv(kCLOCK_DivPLL1Clk0, 1U);
+#endif
+
 #if DT_NODE_HAS_STATUS(DT_NODELABEL(flexcomm1), okay)
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom1Clk, 1u);
 	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM1);
@@ -203,6 +222,11 @@ static int frdm_mcxn947_init(void)
 	CLOCK_AttachClk(kPLL0_to_CTIMER4);
 #endif
 
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(flexcan0), okay)
+	CLOCK_SetClkDiv(kCLOCK_DivFlexcan0Clk, 1U);
+	CLOCK_AttachClk(kPLL1_CLK0_to_FLEXCAN0);
+#endif
+
 #if DT_NODE_HAS_STATUS(DT_NODELABEL(usdhc0), okay)
 	CLOCK_SetClkDiv(kCLOCK_DivUSdhcClk, 1u);
 	CLOCK_AttachClk(kFRO_HF_to_USDHC);

boards/nxp/frdm_mcxn947/doc/index.rst

@@ -92,6 +92,8 @@ The FRDM-MCXN947 board configuration supports the following hardware features:
 +-----------+------------+-------------------------------------+
 | LPCMP     | on-chip    | sensor(comparator)                  |
 +-----------+------------+-------------------------------------+
+| FLEXCAN   | on-chip    | CAN                                 |
++-----------+------------+-------------------------------------+
 
 Targets available
 ==================

boards/nxp/frdm_mcxn947/frdm_mcxn947-pinctrl.dtsi

@@ -166,4 +166,14 @@
 			bias-pull-up;
 		};
 	};
+
+	pinmux_flexcan0: pinmux_flexcan0 {
+		group0 {
+			pinmux = <CAN0_TXD_PIO1_10>,
+				<CAN0_RXD_PIO1_11>;
+			slew-rate = "fast";
+			drive-strength = "low";
+			input-enable;
+		};
+	};
 };

boards/nxp/frdm_mcxn947/frdm_mcxn947.dtsi

@@ -196,3 +196,8 @@
 	pinctrl-0 = <&pinmux_lpcmp0>;
 	pinctrl-names = "default";
 };
+
+&flexcan0 {
+	pinctrl-0 = <&pinmux_flexcan0>;
+	pinctrl-names = "default";
+};

boards/nxp/frdm_mcxn947/frdm_mcxn947_mcxn947_cpu0.dts

@@ -24,6 +24,7 @@
 		zephyr,code-partition = &slot0_partition;
 		zephyr,console = &flexcomm4_lpuart4;
 		zephyr,shell-uart = &flexcomm4_lpuart4;
+		zephyr,canbus = &flexcan0;
 	};
 
 	aliases{
@@ -142,6 +143,10 @@
 	status = "okay";
 };
 
+&flexcan0 {
+	status = "okay";
+};
+
 &ctimer0 {
 	status = "okay";
 };

boards/nxp/frdm_mcxn947/frdm_mcxn947_mcxn947_cpu0.yaml

@@ -15,6 +15,7 @@ toolchain:
   - gnuarmemb
   - xtools
 supported:
+  - can
   - dma
   - gpio
   - spi

dts/arm/nxp/nxp_mcxn94x_common.dtsi

@@ -876,7 +876,7 @@
 	};
 
 	flexcan0: can@d4000 {
-		compatible = "nxp,flexcan-fd", "nxp,flexcan";
+		compatible = "nxp,flexcan";
 		reg = <0xd4000 0x4000>;
 		interrupts = <62 0>;
 		interrupt-names = "common";
@@ -886,7 +886,7 @@
 	};
 
 	flexcan1: can@d8000 {
-		compatible = "nxp,flexcan-fd", "nxp,flexcan";
+		compatible = "nxp,flexcan";
 		reg = <0xd8000 0x4000>;
 		interrupts = <63 0>;
 		interrupt-names = "common";