boards: nxp/frdm_mcxn236: Support Flexcan for NXP frdm_mcxn236 board

Support Flexcan for NXP frdm_mcxn236 board

Signed-off-by: Neil Chen <[email protected]>

Author: NeilChen93

boards/nxp/frdm_mcxn236/board.c

@@ -88,6 +88,27 @@ static int frdm_mcxn236_init(void)
 	/* Set AHBCLKDIV divider to value 1 */
 	CLOCK_SetClkDiv(kCLOCK_DivAhbClk, 1U);
 
+	CLOCK_SetupExtClocking(BOARD_XTAL0_CLK_HZ);
+
+#if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcan1))
+	/* 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_OKAY(DT_NODELABEL(flexcomm1))
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom1Clk, 1u);
 	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM1);
@@ -170,6 +191,11 @@ static int frdm_mcxn236_init(void)
 	CLOCK_AttachClk(kPLL0_to_CTIMER4);
 #endif
 
+#if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcan1))
+	CLOCK_SetClkDiv(kCLOCK_DivFlexcan1Clk, 1U);
+	CLOCK_AttachClk(kPLL1_CLK0_to_FLEXCAN1);
+#endif
+
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(vref))
 	CLOCK_EnableClock(kCLOCK_Vref);
 	SPC_EnableActiveModeAnalogModules(SPC0, kSPC_controlVref);

boards/nxp/frdm_mcxn236/doc/index.rst

@@ -74,6 +74,8 @@ The FRDM-MCXN236 board configuration supports the following hardware features:
 +-----------+------------+-------------------------------------+
 | LPCMP     | on-chip    | sensor(comparator)                  |
 +-----------+------------+-------------------------------------+
+| FLEXCAN   | on-chip    | CAN                                 |
++-----------+------------+-------------------------------------+
 
 Targets available
 ==================

boards/nxp/frdm_mcxn236/frdm_mcxn236-pinctrl.dtsi

@@ -109,4 +109,14 @@
 			bias-pull-up;
 		};
 	};
+
+	pinmux_flexcan1: pinmux_flexcan1 {
+		group0 {
+			pinmux = <CAN1_TXD_PIO4_16>,
+				<CAN1_RXD_PIO4_15>;
+			slew-rate = "fast";
+			drive-strength = "low";
+			input-enable;
+		};
+	};
 };

boards/nxp/frdm_mcxn236/frdm_mcxn236.dts

@@ -21,6 +21,7 @@
 		zephyr,uart-mcumgr = &flexcomm4_lpuart4;
 		zephyr,console = &flexcomm4_lpuart4;
 		zephyr,shell-uart = &flexcomm4_lpuart4;
+		zephyr,canbus = &flexcan1;
 	};
 
 	aliases{
@@ -110,6 +111,10 @@
 	status = "okay";
 };
 
+&flexcan1 {
+	status = "okay";
+};
+
 &ctimer0 {
 	status = "okay";
 };

boards/nxp/frdm_mcxn236/frdm_mcxn236.dtsi

@@ -128,3 +128,8 @@
 	pinctrl-0 = <&pinmux_lpcmp0>;
 	pinctrl-names = "default";
 };
+
+&flexcan1 {
+	pinctrl-0 = <&pinmux_flexcan1>;
+	pinctrl-names = "default";
+};

boards/nxp/frdm_mcxn236/frdm_mcxn236.yaml

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