Re: [PATCH v3 4/4] arm64: dts: freescale: add DT overlay for MX95-15x15-FRDM RPMSG usage

[Francesco Dolcini <francesco@dolcini.it>]

On Thu, Jul 30, 2026 at 09:34:12AM -0700, Laurentiu Mihalcea wrote:
> From: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
> 
> Add RPMSG DT overlay for the MX95-15x15-FRDM board. This overlay is meant
> to be used with the mx95evkrpmsg system manager configuration for
> remoteproc and audio over rpmsg-usecases.
> 
> Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
> Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
> ---
>  arch/arm64/boot/dts/freescale/Makefile        |  3 +
>  .../dts/freescale/imx95-15x15-frdm-rpmsg.dtso | 67 +++++++++++++++++++
>  2 files changed, 70 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/freescale/imx95-15x15-frdm-rpmsg.dtso
> 
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index 95ae85ab4adf..3f98132f5a32 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -707,6 +707,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx943-evk-sdwifi.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-ab2.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-evk.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-frdm.dtb
> +dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-frdm-rpmsg.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx95-19x19-evk.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx95-19x19-evk-sof.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx95-19x19-frdm-pro.dtb
> @@ -729,6 +730,8 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-mallow.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-yavia.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-zinnia.dtb
>  
> +imx95-15x15-frdm-rpmsg-dtbs = imx95-15x15-frdm.dtb imx95-15x15-frdm-rpmsg.dtbo
> +
>  imx95-15x15-evk-pcie-dtbs += imx95-15x15-evk.dtb imx-m2-pcie.dtbo
>  dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-evk-pcie.dtb
>  
> diff --git a/arch/arm64/boot/dts/freescale/imx95-15x15-frdm-rpmsg.dtso b/arch/arm64/boot/dts/freescale/imx95-15x15-frdm-rpmsg.dtso
> new file mode 100644
> index 000000000000..bc02864c6f88
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx95-15x15-frdm-rpmsg.dtso
> @@ -0,0 +1,67 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright 2026 NXP
> + *
> + * This DT overlay is meant to be used alongside the mx95evkrpmsg SM
> + * configuration for remoteproc and audio over rpmsg.
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +&{/} {
> +	remoteproc-cm7 {
> +		compatible = "fsl,imx95-cm7";
> +		mboxes = <&mu7 0 1>, <&mu7 1 1>, <&mu7 3 1>;
> +		mbox-names = "tx", "rx", "rxdb";
> +		memory-region = <&vdev0buffer>, <&vdev0vring0>,
> +				<&vdev0vring1>, <&rsc_table>;
> +		memory-region-names = "vdev0buffer", "vdev0vring0",
> +				      "vdev0vring1", "rsc-table";
> +	};

should we have a common dtsi, instead of having an overlay for each
board? something like arch/arm64/boot/dts/ti/k3-am62-ti-ipc-firmware.dtsi ?

the goal would be to avoid duplication, and to have the functionality
just working out of the box for all the boards that opt in for it.

Francesco