arch/arm64/boot/dts/freescale/Makefile | 2 + .../boot/dts/freescale/imx91-9x9-qsb-can1.dtso | 48 ++++++++++++++++++++++ 2 files changed, 50 insertions(+)
From: Haibo Chen <haibo.chen@nxp.com>
On the i.MX91 9x9 QSB, CAN1 and MICFIL share pins. A TMUX1574RSVR
analog mux controls the routing: when SEL is driven high, CAN1 is
selected; when SEL is driven low, MICFIL is selected. By default,
SEL is kept low.
To enable CAN1, SEL must be driven high. This is done via the can_fun
function defined in the pinctrl-gpiomux node. CAN1 uses the
TJA1057GT/3 PHY.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
This patch is based on the following patch set:
https://lore.kernel.org/imx/20260710024204.3462444-1-chancel.liu@oss.nxp.com/T/#t
---
arch/arm64/boot/dts/freescale/Makefile | 2 +
.../boot/dts/freescale/imx91-9x9-qsb-can1.dtso | 48 ++++++++++++++++++++++
2 files changed, 50 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index 01d4ddfde0989a2f1ae0ac33d236fe1e2b1c970d..37d158c2de88572e2753ccf9ec518d27cbe8d492 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -577,7 +577,9 @@ dtb-$(CONFIG_ARCH_MXC) += imx91-11x11-frdm.dtb
dtb-$(CONFIG_ARCH_MXC) += imx91-11x11-frdm-s.dtb
dtb-$(CONFIG_ARCH_MXC) += imx91-phyboard-segin.dtb
+imx91-9x9-qsb-can1-dtbs += imx91-9x9-qsb.dtb imx91-9x9-qsb-can1.dtbo
imx91-phyboard-segin-peb-av-18-dtbs += imx91-phyboard-segin.dtb imx91-phyboard-segin-peb-av-18.dtbo
+dtb-$(CONFIG_ARCH_MXC) += imx91-9x9-qsb-can1.dtb
dtb-$(CONFIG_ARCH_MXC) += imx91-phyboard-segin-peb-av-18.dtb
dtb-$(CONFIG_ARCH_MXC) += imx91-tqma9131-mba91xxca.dtb
diff --git a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb-can1.dtso b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb-can1.dtso
new file mode 100644
index 0000000000000000000000000000000000000000..b8343d653e511244c838a2a7add8a8d74398f8a2
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb-can1.dtso
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2026 NXP
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+#include "imx91-pinfunc.h"
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+ flexcan_phy: can-phy {
+ compatible = "nxp,tja1057";
+ #phy-cells = <0>;
+ max-bitrate = <5000000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_flexcan_phy>;
+ silent-gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
+ };
+};
+
+&flexcan1 {
+ phys = <&flexcan_phy>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_flexcan1>, <&can_fun>;
+ status = "okay";
+};
+
+&iomuxc {
+ pinctrl_flexcan_phy: flexcanphygrp {
+ fsl,pins = <
+ MX91_PAD_PDM_BIT_STREAM1__GPIO1_IO10 0x31e
+ >;
+ };
+
+ pinctrl_flexcan1: flexcan1grp {
+ fsl,pins = <
+ MX91_PAD_PDM_CLK__CAN1_TX 0x139e
+ MX91_PAD_PDM_BIT_STREAM0__CAN1_RX 0x139e
+ >;
+ };
+};
+
+/* micfil uses PDM port A pins, conflicts with can1 */
+&micfil {
+ status = "disabled";
+};
---
base-commit: b9fff21cbd480f47f04debbce6c14f48dd715f0a
change-id: 20260710-dts-imx91-can1-b755fdc11de1
Best regards,
--
Haibo Chen <haibo.chen@nxp.com>From: Frank Li <Frank.Li@nxp.com>
On Fri, 10 Jul 2026 18:12:20 +0800, haibo.chen@oss.nxp.com wrote:
> On the i.MX91 9x9 QSB, CAN1 and MICFIL share pins. A TMUX1574RSVR
> analog mux controls the routing: when SEL is driven high, CAN1 is
> selected; when SEL is driven low, MICFIL is selected. By default,
> SEL is kept low.
>
> To enable CAN1, SEL must be driven high. This is done via the can_fun
> function defined in the pinctrl-gpiomux node. CAN1 uses the
> TJA1057GT/3 PHY.
>
> [...]
Applied, thanks!
[1/1] arm64: dts: imx91-9x9-qsb: add CAN support overlay file
commit: 356894c37aa1f8ab430cef5d69176123b0ec98b3
Best regards,
--
Frank Li <Frank.Li@nxp.com>
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