[PATCH/RFT] arm64: dts: renesas: r9a09g047e57-smarc: Update CAN transceivers

[Lad, Prabhakar]

On Tue, Aug 25, 2026 at 3:57 PM Geert Uytterhoeven
<geert+renesas at glider.be> wrote:
>
> The dual-channel TCAN1046V-Q1 CAN Transceiver on the RZ/G3E SMARC EVK is
> currently modelled as two TCAN1042 instances.  Improve hardware
> description by describing the actual transceiver.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
> ---
> Compile-tested only due to lack of hardware.
>
> At least the TI AM68 SK DTS should be updated, too.
> There may be others ("git grep -wc ti,tcan1042 | grep -v :1$").
> ---
>  .../boot/dts/renesas/r9a09g047e57-smarc.dts   | 25 +++++++++++--------
>  .../boot/dts/renesas/renesas-smarc2.dtsi      | 13 +++-------
>  2 files changed, 17 insertions(+), 21 deletions(-)
>
Apart from the sysfs file name changes everything works as expected.

Old path                                               New path
/sys/class/phy/phy-can-phy0.0            /sys/class/phy/phy-can-phy.0
/sys/class/phy/phy-can-phy1.1            /sys/class/phy/phy-can-phy.1

Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj at bp.renesas.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj at bp.renesas.com>

Cheers,
Prabhakar

> diff --git a/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts b/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts
> index 469a6282b2a30c91..14f5834082fa500e 100644
> --- a/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts
> +++ b/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts
> @@ -112,7 +112,7 @@ &canfd {
>         channel1 {
>                 status = "okay";
>  #if (!SW_LCD_EN) && (SW_GPIO9_CAN1_STB)
> -               phys = <&can_transceiver1>;
> +               phys = <&can_transceiver 1>;
>  #endif
>         };
>  #endif
> @@ -121,22 +121,25 @@ channel1 {
>         channel4 {
>                 status = "okay";
>  #if (SW_GPIO8_CAN0_STB)
> -               phys = <&can_transceiver0>;
> +               phys = <&can_transceiver 0>;
>  #endif
>         };
>  #endif
>  };
>
> -#if (!SW_LCD_EN) && (SW_GPIO8_CAN0_STB)
> -&can_transceiver0 {
> -       standby-gpios = <&pinctrl RZG3E_GPIO(5, 4) GPIO_ACTIVE_HIGH>;
> -       status = "okay";
> -};
> +#if (!SW_LCD_EN) && (SW_GPIO8_CAN0_STB || SW_GPIO9_CAN1_STB)
> +&can_transceiver {
> +       standby-gpios =
> +#if (SW_GPIO8_CAN0_STB)
> +                       <&pinctrl RZG3E_GPIO(5, 4) GPIO_ACTIVE_HIGH>,
> +#else
> +                       <0>,
> +#endif
> +#if (SW_GPIO9_CAN1_STB)
> +                       <&pinctrl RZG3E_GPIO(5, 5) GPIO_ACTIVE_HIGH>;
> +#else
> +                       <0>;
>  #endif
> -
> -#if (!SW_LCD_EN) && (SW_GPIO9_CAN1_STB)
> -&can_transceiver1 {
> -       standby-gpios = <&pinctrl RZG3E_GPIO(5, 5) GPIO_ACTIVE_HIGH>;
>         status = "okay";
>  };
>  #endif
> diff --git a/arch/arm64/boot/dts/renesas/renesas-smarc2.dtsi b/arch/arm64/boot/dts/renesas/renesas-smarc2.dtsi
> index 696a933af808a8eb..826a11ab93c7a253 100644
> --- a/arch/arm64/boot/dts/renesas/renesas-smarc2.dtsi
> +++ b/arch/arm64/boot/dts/renesas/renesas-smarc2.dtsi
> @@ -44,16 +44,9 @@ chosen {
>                 stdout-path = "serial3:115200n8";
>         };
>
> -       can_transceiver0: can-phy0 {
> -               compatible = "ti,tcan1042";
> -               #phy-cells = <0>;
> -               max-bitrate = <8000000>;
> -               status = "disabled";
> -       };
> -
> -       can_transceiver1: can-phy1 {
> -               compatible = "ti,tcan1042";
> -               #phy-cells = <0>;
> +       can_transceiver: can-phy {
> +               compatible = "ti,tcan1046", "nxp,tja1048";
> +               #phy-cells = <1>;
>                 max-bitrate = <8000000>;
>                 status = "disabled";
>         };
> --
> 2.43.0
>
>