dts: can: mcux: flexcan: Add nxp,max-mb property to FlexCAN nodes

william-tang914 · william-tang914 · commit 45b9fcd3b11d · 2025-11-17T14:06:08.000+08:00
Add the `nxp,max-mb` and `nxp,max-mb-fd` device tree property to
all NXP FlexCAN controller nodes across various SoC families to
specify the maximum number of 8-byte and 64-byte payload message
buffers supported by each FlexCAN instance.

This change updates device tree source files for multiple NXP SoC
families including Kinetis K6x, RT10xx, RT11xx, RT118x, MCX, S32K,
S32Z series, and i.MX8MP/i.MX93. The property values are set based
on hardware specifications for each specific FlexCAN instance.

This property addition ensures proper resource allocation and
prevents buffer overflow issues in FlexCAN driver implementations.

Signed-off-by: William Tang &lt;william.tang@nxp.com&gt;
diff --git a/dts/arm/nxp/nxp_k66.dtsi b/dts/arm/nxp/nxp_k66.dtsi
@@ -32,6 +32,7 @@
 					  "rx-warning", "wake-up";
 			clocks = <&sim KINETIS_SIM_BUS_CLK 0x1030 4>;
 			clk-source = <1>;
+			nxp,max-mb = <16>;
 			status = "disabled";
 		};
 	};
diff --git a/dts/arm/nxp/nxp_k6x.dtsi b/dts/arm/nxp/nxp_k6x.dtsi
@@ -521,6 +521,7 @@
 			interrupt-names = "mb-0-15", "bus-off", "error", "tx-warning", "rx-warning", "wake-up";
 			clocks = <&sim KINETIS_SIM_BUS_CLK 0x103C 4>;
 			clk-source = <1>;
+			nxp,max-mb = <16>;
 			status = "disabled";
 		};
 
diff --git a/dts/arm/nxp/nxp_ke1xf.dtsi b/dts/arm/nxp/nxp_ke1xf.dtsi
@@ -411,6 +411,7 @@
 					  "mb-0-15";
 			clocks = <&scg KINETIS_SCG_BUS_CLK>;
 			clk-source = <1>;
+			nxp,max-mb = <16>;
 			status = "disabled";
 		};
 
@@ -422,6 +423,7 @@
 					  "mb-0-15";
 			clocks = <&scg KINETIS_SCG_BUS_CLK>;
 			clk-source = <1>;
+			nxp,max-mb = <16>;
 			status = "disabled";
 		};
 
diff --git a/dts/arm/nxp/nxp_mcxa156.dtsi b/dts/arm/nxp/nxp_mcxa156.dtsi
@@ -266,6 +266,7 @@
 			interrupt-names = "common";
 			clocks = <&syscon MCUX_FLEXCAN0_CLK>;
 			clk-source = <0>;
+			nxp,max-mb = <32>;
 			status = "disabled";
 		};
 
diff --git a/dts/arm/nxp/nxp_mcxa344.dtsi b/dts/arm/nxp/nxp_mcxa344.dtsi
@@ -256,6 +256,7 @@
 			interrupt-names = "common";
 			clocks = <&syscon MCUX_FLEXCAN0_CLK>;
 			clk-source = <0>;
+			nxp,max-mb = <32>;
 			status = "disabled";
 		};
 
diff --git a/dts/arm/nxp/nxp_mcxe245.dtsi b/dts/arm/nxp/nxp_mcxe245.dtsi
@@ -35,16 +35,23 @@
 	};
 };
 
+&flexcan0 {
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
+};
+
 &flexcan1 {
 	compatible = "nxp,flexcan";
 	interrupts = <85 0>, <86 0>, <88 0>;
 	interrupt-names = "ored-warning-bus-off", "error", "mb-0-15";
+	nxp,max-mb = <16>;
 };
 
 &flexcan2 {
 	compatible = "nxp,flexcan";
 	interrupts = <92 0>, <93 0>, <95 0>;
 	interrupt-names = "ored-warning-bus-off", "error", "mb-0-15";
+	nxp,max-mb = <16>;
 };
 
 /delete-node/ &ftm4;
diff --git a/dts/arm/nxp/nxp_mcxe246.dtsi b/dts/arm/nxp/nxp_mcxe246.dtsi
@@ -35,10 +35,21 @@
 	};
 };
 
+&flexcan0 {
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
+};
+
+&flexcan1 {
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
+};
+
 &flexcan2 {
 	compatible = "nxp,flexcan";
 	interrupts = <92 0>, <93 0>, <95 0>;
 	interrupt-names = "ored-warning-bus-off", "error", "mb-0-15";
+	nxp,max-mb = <16>;
 };
 
 /delete-node/ &ftm4;
diff --git a/dts/arm/nxp/nxp_mcxe247.dtsi b/dts/arm/nxp/nxp_mcxe247.dtsi
@@ -34,3 +34,18 @@
 		write-block-size = <8>;
 	};
 };
+
+&flexcan0 {
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
+};
+
+&flexcan1 {
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
+};
+
+&flexcan2 {
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
+};
diff --git a/dts/arm/nxp/nxp_mcxe31b.dtsi b/dts/arm/nxp/nxp_mcxe31b.dtsi
@@ -52,3 +52,27 @@
 };
 
 #include <nxp/nxp_mcxe31x_common.dtsi>
+
+&flexcan_0 {
+	nxp,max-mb = <96>;
+};
+
+&flexcan_1 {
+	nxp,max-mb = <64>;
+};
+
+&flexcan_2 {
+	nxp,max-mb = <64>;
+};
+
+&flexcan_3 {
+	nxp,max-mb = <32>;
+};
+
+&flexcan_4 {
+	nxp,max-mb = <32>;
+};
+
+&flexcan_5 {
+	nxp,max-mb = <32>;
+};
diff --git a/dts/arm/nxp/nxp_mcxn23x_common.dtsi b/dts/arm/nxp/nxp_mcxn23x_common.dtsi
@@ -814,6 +814,7 @@
 		interrupt-names = "common";
 		clocks = <&syscon MCUX_FLEXCAN0_CLK>;
 		clk-source = <0>;
+		nxp,max-mb = <32>;
 		status = "disabled";
 	};
 
@@ -824,6 +825,7 @@
 		interrupt-names = "common";
 		clocks = <&syscon MCUX_FLEXCAN1_CLK>;
 		clk-source = <0>;
+		nxp,max-mb = <32>;
 		status = "disabled";
 	};
 
diff --git a/dts/arm/nxp/nxp_mcxn94x_common.dtsi b/dts/arm/nxp/nxp_mcxn94x_common.dtsi
@@ -112,6 +112,7 @@
 		interrupt-names = "common";
 		clocks = <&syscon MCUX_FLEXCAN1_CLK>;
 		clk-source = <0>;
+		nxp,max-mb = <32>;
 		status = "disabled";
 	};
 
diff --git a/dts/arm/nxp/nxp_mcxnx4x_common.dtsi b/dts/arm/nxp/nxp_mcxnx4x_common.dtsi
@@ -1001,6 +1001,7 @@
 		interrupt-names = "common";
 		clocks = <&syscon MCUX_FLEXCAN0_CLK>;
 		clk-source = <0>;
+		nxp,max-mb = <32>;
 		status = "disabled";
 	};
 
diff --git a/dts/arm/nxp/nxp_mcxw7x_common.dtsi b/dts/arm/nxp/nxp_mcxw7x_common.dtsi
@@ -377,6 +377,7 @@
 		interrupt-names = "common";
 		clocks = <&scg SCG_K4_FIRC_CLK 0xec>;
 		clk-source = <2>;
+		nxp,max-mb = <32>;
 		status = "disabled";
 	};
 
diff --git a/dts/arm/nxp/nxp_rt10xx.dtsi b/dts/arm/nxp/nxp_rt10xx.dtsi
@@ -970,6 +970,7 @@
 			interrupt-names = "common";
 			clocks = <&ccm IMX_CCM_CAN_CLK 0x68 14>;
 			clk-source = <2>;
+			nxp,max-mb = <64>;
 			status = "disabled";
 		};
 
@@ -980,6 +981,7 @@
 			interrupt-names = "common";
 			clocks = <&ccm IMX_CCM_CAN_CLK 0x68 18>;
 			clk-source = <2>;
+			nxp,max-mb = <64>;
 			status = "disabled";
 		};
 
@@ -990,6 +992,8 @@
 			interrupt-names = "common";
 			clocks = <&ccm IMX_CCM_CAN_CLK 0x84 6>;
 			clk-source = <2>;
+			nxp,max-mb = <64>;
+			nxp,max-mb-fd = <14>;
 			status = "disabled";
 		};
 
diff --git a/dts/arm/nxp/nxp_rt118x.dtsi b/dts/arm/nxp/nxp_rt118x.dtsi
@@ -774,6 +774,8 @@
 		interrupt-names = "common", "error";
 		clocks = <&ccm IMX_CCM_CAN1_CLK 0x68 14>;
 		clk-source = <0>;
+		nxp,max-mb = <96>;
+		nxp,max-mb-fd = <21>;
 		status = "disabled";
 	};
 
@@ -784,6 +786,8 @@
 		interrupt-names = "common", "error";
 		clocks = <&ccm IMX_CCM_CAN2_CLK 0x68 18>;
 		clk-source = <0>;
+		nxp,max-mb = <96>;
+		nxp,max-mb-fd = <21>;
 		status = "disabled";
 	};
 
@@ -794,6 +798,8 @@
 		interrupt-names = "common", "error";
 		clocks = <&ccm IMX_CCM_CAN3_CLK 0x84 6>;
 		clk-source = <0>;
+		nxp,max-mb = <96>;
+		nxp,max-mb-fd = <21>;
 		status = "disabled";
 	};
 
diff --git a/dts/arm/nxp/nxp_rt11xx.dtsi b/dts/arm/nxp/nxp_rt11xx.dtsi
@@ -917,6 +917,8 @@
 			interrupt-names = "common", "error";
 			clocks = <&ccm IMX_CCM_CAN1_CLK 0x68 14>;
 			clk-source = <0>;
+			nxp,max-mb = <64>;
+			nxp,max-mb-fd = <14>;
 			status = "disabled";
 		};
 
@@ -927,6 +929,8 @@
 			interrupt-names = "common", "error";
 			clocks = <&ccm IMX_CCM_CAN2_CLK 0x68 18>;
 			clk-source = <0>;
+			nxp,max-mb = <64>;
+			nxp,max-mb-fd = <14>;
 			status = "disabled";
 		};
 
@@ -937,6 +941,8 @@
 			interrupt-names = "common", "error";
 			clocks = <&ccm IMX_CCM_CAN3_CLK 0x84 6>;
 			clk-source = <0>;
+			nxp,max-mb = <64>;
+			nxp,max-mb-fd = <14>;
 			status = "disabled";
 		};
 
diff --git a/dts/arm/nxp/nxp_s32k146.dtsi b/dts/arm/nxp/nxp_s32k146.dtsi
@@ -65,16 +65,21 @@
 &flexcan0 {
 	interrupts = <78 0>, <79 0>, <80 0>, <81 0>, <82 0>;
 	interrupt-names = "warning", "error", "wake-up", "mb-0-15", "mb-16-31";
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
 };
 
 &flexcan1 {
 	interrupts = <85 0>, <86 0>, <88 0>, <89 0>;
 	interrupt-names = "warning", "error", "mb-0-15", "mb-16-31";
 	clocks = <&clock NXP_S32_FLEXCAN1_CLK>;
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
 };
 
 &flexcan2 {
 	interrupts = <92 0>, <93 0>, <95 0>;
 	interrupt-names = "warning", "error", "mb-0-15";
 	clocks = <&clock NXP_S32_FLEXCAN2_CLK>;
+	nxp,max-mb = <16>;
 };
diff --git a/dts/arm/nxp/nxp_s32k148.dtsi b/dts/arm/nxp/nxp_s32k148.dtsi
@@ -88,16 +88,22 @@
 &flexcan0 {
 	interrupts = <78 0>, <79 0>, <80 0>, <81 0>, <82 0>;
 	interrupt-names = "warning", "error", "wake-up", "mb-0-15", "mb-16-31";
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
 };
 
 &flexcan1 {
 	interrupts = <85 0>, <86 0>, <88 0>, <89 0>;
 	interrupt-names = "warning", "error", "mb-0-15", "mb-16-31";
 	clocks = <&clock NXP_S32_FLEXCAN1_CLK>;
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
 };
 
 &flexcan2 {
 	interrupts = <92 0>, <93 0>, <95 0>, <96 0>;
 	interrupt-names = "warning", "error", "mb-0-15", "mb-16-31";
 	clocks = <&clock NXP_S32_FLEXCAN2_CLK>;
+	nxp,max-mb = <32>;
+	nxp,max-mb-fd = <7>;
 };
diff --git a/dts/arm/nxp/nxp_s32k344_m7.dtsi b/dts/arm/nxp/nxp_s32k344_m7.dtsi
@@ -471,6 +471,8 @@
 			interrupts = <109 0>, <110 0>, <111 0>, <112 0>;
 			interrupt-names = "ored", "ored_0_31_mb",
 					  "ored_32_63_mb", "ored_64_95_mb";
+			nxp,max-mb = <96>;
+			nxp,max-mb-fd = <21>;
 			status = "disabled";
 		};
 
@@ -481,6 +483,8 @@
 			clk-source = <0>;
 			interrupts = <113 0>, <114 0>, <115 0>;
 			interrupt-names = "ored", "ored_0_31_mb", "ored_32_63_mb";
+			nxp,max-mb = <64>;
+			nxp,max-mb-fd = <14>;
 			status = "disabled";
 		};
 
@@ -491,6 +495,8 @@
 			clk-source = <0>;
 			interrupts = <116 0>, <117 0>, <118 0>;
 			interrupt-names = "ored", "ored_0_31_mb", "ored_32_63_mb";
+			nxp,max-mb = <64>;
+			nxp,max-mb-fd = <14>;
 			status = "disabled";
 		};
 
@@ -501,6 +507,8 @@
 			clk-source = <0>;
 			interrupts = <119 0>, <120 0>;
 			interrupt-names = "ored", "ored_0_31_mb";
+			nxp,max-mb = <32>;
+			nxp,max-mb-fd = <7>;
 			status = "disabled";
 		};
 
@@ -511,6 +519,8 @@
 			clk-source = <0>;
 			interrupts = <121 0>, <122 0>;
 			interrupt-names = "ored", "ored_0_31_mb";
+			nxp,max-mb = <32>;
+			nxp,max-mb-fd = <7>;
 			status = "disabled";
 		};
 
@@ -521,6 +531,8 @@
 			clk-source = <0>;
 			interrupts = <123 0>, <124 0>;
 			interrupt-names = "ored", "ored_0_31_mb";
+			nxp,max-mb = <32>;
+			nxp,max-mb-fd = <7>;
 			status = "disabled";
 		};
 
diff --git a/dts/arm/nxp/nxp_s32z27x_r52.dtsi b/dts/arm/nxp/nxp_s32z27x_r52.dtsi
diff --git a/dts/arm64/nxp/nxp_mimx8mp_a53.dtsi b/dts/arm64/nxp/nxp_mimx8mp_a53.dtsi
diff --git a/dts/arm64/nxp/nxp_mimx93_a55.dtsi b/dts/arm64/nxp/nxp_mimx93_a55.dtsi
diff --git a/dts/bindings/can/nxp,flexcan-fd.yaml b/dts/bindings/can/nxp,flexcan-fd.yaml
diff --git a/dts/bindings/can/nxp,flexcan.yaml b/dts/bindings/can/nxp,flexcan.yaml
