[PATCH 0/4] arm64: dts: freescale: Add Toradex iMX95 overlays

[PATCH 0/4] arm64: dts: freescale: Add Toradex iMX95 overlays

[Ernest Van Hoecke]

This series adds device tree overlays for the Toradex Verdin, Aquila,
and SMARC iMX95 SoMs.

The series adds support for:
- NAU8822 Bridge Tied Load configuration on the Verdin Development Board
- UART_4 reservation for Cortex-M7 firmware on Verdin and Aquila
- SER0 reservation for Cortex-M7 firmware on SMARC

The UART overlays mark the port as reserved so Linux does not claim it.
Firmware remains responsible for configuring the UART and its pads.

The Makefile entries build standalone DTBOs and ready-to-use composed
DTBs for the corresponding Development Boards.

Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
---
Ernest Van Hoecke (4):
      arm64: dts: freescale: imx95-verdin: Add NAU8822 Bridge Tied Load
      arm64: dts: freescale: imx95-verdin: Add Cortex-M7 UART_4 overlay
      arm64: dts: freescale: imx95-aquila: Add Cortex-M7 UART_4 overlay
      arm64: dts: freescale: imx95-toradex-smarc: Add Cortex-M7 SER0 overlay

 arch/arm64/boot/dts/freescale/Makefile                    | 15 +++++++++++++++
 arch/arm64/boot/dts/freescale/imx95-aquila-uart4-mcu.dtso | 14 ++++++++++++++
 .../boot/dts/freescale/imx95-toradex-smarc-ser0-mcu.dtso  | 14 ++++++++++++++
 .../boot/dts/freescale/imx95-verdin-dev-nau8822-btl.dtso  | 14 ++++++++++++++
 arch/arm64/boot/dts/freescale/imx95-verdin-uart4-mcu.dtso | 14 ++++++++++++++
 5 files changed, 71 insertions(+)
---
base-commit: 478f68c644732750f8386e4de7c909c5ffb26ab2
change-id: 20260922-v1-imx95-overlays-89b3a9185b93

Best regards,
-- 
Ernest Van Hoecke <ernest.vanhoecke@toradex.com>

[PATCH 1/4] arm64: dts: freescale: imx95-verdin: Add NAU8822 Bridge Tied Load

[Ernest Van Hoecke]

From: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>

The NAU8822 on the Verdin Development Board can combine its two
loudspeaker outputs into a Bridge Tied Load output. Add an overlay to
select this mode when using the board with Verdin iMX95.

The overlay is also combined with the Verdin iMX95 Development Board
device tree to provide a ready-to-use DTB for the WiFi SoM variant.
The codec and its routing are already described by the carrier device
tree.

Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
---
 arch/arm64/boot/dts/freescale/Makefile                     |  4 ++++
 .../boot/dts/freescale/imx95-verdin-dev-nau8822-btl.dtso   | 14 ++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index 7944e3b32513..a7ae74a706a8 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -959,6 +959,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-toradex-smarc-dev.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-tqma9596la-mba95xxca.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-tqma9596sa-mb-smarc-2.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-var-dart-sonata.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-dev-nau8822-btl.dtbo
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-dahlia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-dev.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-ivy.dtb
@@ -966,12 +967,15 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-mallow.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-yavia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-zinnia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dahlia.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dev-nau8822-btl.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dev.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-ivy.dtb
 dtb-$(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-verdin-wifi-dev-nau8822-btl-dtbs := imx95-verdin-wifi-dev.dtb imx95-verdin-dev-nau8822-btl.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-verdin-dev-nau8822-btl.dtso b/arch/arm64/boot/dts/freescale/imx95-verdin-dev-nau8822-btl.dtso
new file mode 100644
index 000000000000..e94c60381c4e
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx95-verdin-dev-nau8822-btl.dtso
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (c) Toradex
+ *
+ * Enable Bridge Tied Load (BTL) speaker mode on the Verdin Development Board,
+ * combining the two loudspeaker outputs for higher output power.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&nau8822_1a {
+	nuvoton,spk-btl;
+};

-- 
2.43.0

[PATCH 2/4] arm64: dts: freescale: imx95-verdin: Add Cortex-M7 UART_4 overlay

[Ernest Van Hoecke]

From: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>

Verdin UART_4 can be assigned to Cortex-M7 firmware. Add an overlay
that reserves LPUART2 so Linux does not claim the port. Firmware must
configure the UART and its pads for the intended MCU application.

The overlay is also combined with the Verdin iMX95 Development Board
device tree to provide a ready-to-use DTB for the WiFi SoM variant.

Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
---
 arch/arm64/boot/dts/freescale/Makefile                    |  3 +++
 arch/arm64/boot/dts/freescale/imx95-verdin-uart4-mcu.dtso | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index a7ae74a706a8..c283c582d974 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -966,8 +966,10 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-ivy.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-mallow.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-yavia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-zinnia.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-uart4-mcu.dtbo
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dahlia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dev-nau8822-btl.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dev-uart4-mcu.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dev.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-ivy.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-mallow.dtb
@@ -975,6 +977,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-yavia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-zinnia.dtb
 
 imx95-verdin-wifi-dev-nau8822-btl-dtbs := imx95-verdin-wifi-dev.dtb imx95-verdin-dev-nau8822-btl.dtbo
+imx95-verdin-wifi-dev-uart4-mcu-dtbs := imx95-verdin-wifi-dev.dtb imx95-verdin-uart4-mcu.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-verdin-uart4-mcu.dtso b/arch/arm64/boot/dts/freescale/imx95-verdin-uart4-mcu.dtso
new file mode 100644
index 000000000000..efe3849f262d
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx95-verdin-uart4-mcu.dtso
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (c) Toradex
+ *
+ * Verdin iMX95 UART_4 for Cortex-M7
+ */
+
+/dts-v1/;
+/plugin/;
+
+/* Verdin UART_4 */
+&lpuart2 {
+	status = "reserved";
+};

-- 
2.43.0

[PATCH 3/4] arm64: dts: freescale: imx95-aquila: Add Cortex-M7 UART_4 overlay

[Ernest Van Hoecke]

From: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>

Aquila UART_4 can be assigned to Cortex-M7 firmware. Add an overlay
that reserves LPUART2 so Linux does not claim the port. Firmware must
configure the UART and its pads for the intended MCU application.

The overlay is also combined with the Aquila iMX95 Development Board
device tree to provide a ready-to-use DTB.

Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
---
 arch/arm64/boot/dts/freescale/Makefile                    |  4 ++++
 arch/arm64/boot/dts/freescale/imx95-aquila-uart4-mcu.dtso | 14 ++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index c283c582d974..b17fd5b067de 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -954,7 +954,9 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-19x19-evk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-19x19-evk-sof.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-19x19-frdm-pro.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-aquila-clover.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx95-aquila-dev-uart4-mcu.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-aquila-dev.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx95-aquila-uart4-mcu.dtbo
 dtb-$(CONFIG_ARCH_MXC) += imx95-toradex-smarc-dev.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-tqma9596la-mba95xxca.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-tqma9596sa-mb-smarc-2.dtb
@@ -976,6 +978,8 @@ 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-aquila-dev-uart4-mcu-dtbs := imx95-aquila-dev.dtb imx95-aquila-uart4-mcu.dtbo
+
 imx95-verdin-wifi-dev-nau8822-btl-dtbs := imx95-verdin-wifi-dev.dtb imx95-verdin-dev-nau8822-btl.dtbo
 imx95-verdin-wifi-dev-uart4-mcu-dtbs := imx95-verdin-wifi-dev.dtb imx95-verdin-uart4-mcu.dtbo
 
diff --git a/arch/arm64/boot/dts/freescale/imx95-aquila-uart4-mcu.dtso b/arch/arm64/boot/dts/freescale/imx95-aquila-uart4-mcu.dtso
new file mode 100644
index 000000000000..140025af4d53
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx95-aquila-uart4-mcu.dtso
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (c) Toradex
+ *
+ * Aquila iMX95 UART_4 for Cortex-M7
+ */
+
+/dts-v1/;
+/plugin/;
+
+/* Aquila UART_4 */
+&lpuart2 {
+	status = "reserved";
+};

-- 
2.43.0

[PATCH 4/4] arm64: dts: freescale: imx95-toradex-smarc: Add Cortex-M7 SER0 overlay

[Ernest Van Hoecke]

From: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>

SMARC SER0 can be assigned to Cortex-M7 firmware. Add an overlay that
reserves LPUART2 so Linux does not claim the port. On the Development
Board this removes the Linux RS485 port on SER0, while the console on
SER1 (LPUART1) remains available. Firmware must configure the UART and
its pads for the intended MCU application.

The overlay is also combined with the Toradex SMARC iMX95 Development
Board device tree to provide a ready-to-use DTB.

Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
---
 arch/arm64/boot/dts/freescale/Makefile                     |  4 ++++
 .../boot/dts/freescale/imx95-toradex-smarc-ser0-mcu.dtso   | 14 ++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index b17fd5b067de..489da1fb0012 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -957,7 +957,9 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-aquila-clover.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-aquila-dev-uart4-mcu.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-aquila-dev.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-aquila-uart4-mcu.dtbo
+dtb-$(CONFIG_ARCH_MXC) += imx95-toradex-smarc-dev-ser0-mcu.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-toradex-smarc-dev.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx95-toradex-smarc-ser0-mcu.dtbo
 dtb-$(CONFIG_ARCH_MXC) += imx95-tqma9596la-mba95xxca.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-tqma9596sa-mb-smarc-2.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-var-dart-sonata.dtb
@@ -980,6 +982,8 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-zinnia.dtb
 
 imx95-aquila-dev-uart4-mcu-dtbs := imx95-aquila-dev.dtb imx95-aquila-uart4-mcu.dtbo
 
+imx95-toradex-smarc-dev-ser0-mcu-dtbs := imx95-toradex-smarc-dev.dtb imx95-toradex-smarc-ser0-mcu.dtbo
+
 imx95-verdin-wifi-dev-nau8822-btl-dtbs := imx95-verdin-wifi-dev.dtb imx95-verdin-dev-nau8822-btl.dtbo
 imx95-verdin-wifi-dev-uart4-mcu-dtbs := imx95-verdin-wifi-dev.dtb imx95-verdin-uart4-mcu.dtbo
 
diff --git a/arch/arm64/boot/dts/freescale/imx95-toradex-smarc-ser0-mcu.dtso b/arch/arm64/boot/dts/freescale/imx95-toradex-smarc-ser0-mcu.dtso
new file mode 100644
index 000000000000..cbc58f1af41d
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx95-toradex-smarc-ser0-mcu.dtso
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (c) Toradex
+ *
+ * Toradex SMARC iMX95 SER0 for Cortex-M7
+ */
+
+/dts-v1/;
+/plugin/;
+
+/* SMARC SER0 */
+&lpuart2 {
+	status = "reserved";
+};

-- 
2.43.0

Re: [PATCH 0/4] arm64: dts: freescale: Add Toradex iMX95 overlays

[Frank Li]

On Tue, Sep 22, 2026 at 04:33:45PM +0200, Ernest Van Hoecke wrote:
> This series adds device tree overlays for the Toradex Verdin, Aquila,
> and SMARC iMX95 SoMs.
>
> The series adds support for:
> - NAU8822 Bridge Tied Load configuration on the Verdin Development Board
> - UART_4 reservation for Cortex-M7 firmware on Verdin and Aquila
> - SER0 reservation for Cortex-M7 firmware on SMARC
>
> The UART overlays mark the port as reserved so Linux does not claim it.
> Firmware remains responsible for configuring the UART and its pads.
>
> The Makefile entries build standalone DTBOs and ready-to-use composed
> DTBs for the corresponding Development Boards.
>
> Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
> ---
> Ernest Van Hoecke (4):
>       arm64: dts: freescale: imx95-verdin: Add NAU8822 Bridge Tied Load
>       arm64: dts: freescale: imx95-verdin: Add Cortex-M7 UART_4 overlay
>       arm64: dts: freescale: imx95-aquila: Add Cortex-M7 UART_4 overlay

both reserved lpuart2, can you share one dtso?

Frank

>       arm64: dts: freescale: imx95-toradex-smarc: Add Cortex-M7 SER0 overlay
>
>  arch/arm64/boot/dts/freescale/Makefile                    | 15 +++++++++++++++
>  arch/arm64/boot/dts/freescale/imx95-aquila-uart4-mcu.dtso | 14 ++++++++++++++
>  .../boot/dts/freescale/imx95-toradex-smarc-ser0-mcu.dtso  | 14 ++++++++++++++
>  .../boot/dts/freescale/imx95-verdin-dev-nau8822-btl.dtso  | 14 ++++++++++++++
>  arch/arm64/boot/dts/freescale/imx95-verdin-uart4-mcu.dtso | 14 ++++++++++++++
>  5 files changed, 71 insertions(+)
> ---
> base-commit: 478f68c644732750f8386e4de7c909c5ffb26ab2
> change-id: 20260922-v1-imx95-overlays-89b3a9185b93
>
> Best regards,
> --
> Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
>
>

Re: [PATCH 0/4] arm64: dts: freescale: Add Toradex iMX95 overlays

[Francesco Dolcini]

On Tue, Sep 22, 2026 at 11:07:44AM -0500, Frank Li wrote:
> On Tue, Sep 22, 2026 at 04:33:45PM +0200, Ernest Van Hoecke wrote:
> > This series adds device tree overlays for the Toradex Verdin, Aquila,
> > and SMARC iMX95 SoMs.
> >
> > The series adds support for:
> > - NAU8822 Bridge Tied Load configuration on the Verdin Development Board
> > - UART_4 reservation for Cortex-M7 firmware on Verdin and Aquila
> > - SER0 reservation for Cortex-M7 firmware on SMARC
> >
> > The UART overlays mark the port as reserved so Linux does not claim it.
> > Firmware remains responsible for configuring the UART and its pads.
> >
> > The Makefile entries build standalone DTBOs and ready-to-use composed
> > DTBs for the corresponding Development Boards.
> >
> > Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
> > ---
> > Ernest Van Hoecke (4):
> >       arm64: dts: freescale: imx95-verdin: Add NAU8822 Bridge Tied Load
> >       arm64: dts: freescale: imx95-verdin: Add Cortex-M7 UART_4 overlay
> >       arm64: dts: freescale: imx95-aquila: Add Cortex-M7 UART_4 overlay
> 
> both reserved lpuart2, can you share one dtso?

The comment in the DT file must be different because it's important to
reference the actual board it applies to.

So to fulfill this request we would need to add a common dtsi, include
it from two different dtso files.

This to save 2 lines of duplicated code, `&lpuart2 { status = "reserved"; };`.

To me this is just worst than the current proposal.

Francesco

Re: [PATCH 0/4] arm64: dts: freescale: Add Toradex iMX95 overlays

[Frank Li]

On Tue, Sep 22, 2026 at 06:58:46PM +0200, Francesco Dolcini wrote:
> On Tue, Sep 22, 2026 at 11:07:44AM -0500, Frank Li wrote:
> > On Tue, Sep 22, 2026 at 04:33:45PM +0200, Ernest Van Hoecke wrote:
> > > This series adds device tree overlays for the Toradex Verdin, Aquila,
> > > and SMARC iMX95 SoMs.
> > >
> > > The series adds support for:
> > > - NAU8822 Bridge Tied Load configuration on the Verdin Development Board
> > > - UART_4 reservation for Cortex-M7 firmware on Verdin and Aquila
> > > - SER0 reservation for Cortex-M7 firmware on SMARC
> > >
> > > The UART overlays mark the port as reserved so Linux does not claim it.
> > > Firmware remains responsible for configuring the UART and its pads.
> > >
> > > The Makefile entries build standalone DTBOs and ready-to-use composed
> > > DTBs for the corresponding Development Boards.
> > >
> > > Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
> > > ---
> > > Ernest Van Hoecke (4):
> > >       arm64: dts: freescale: imx95-verdin: Add NAU8822 Bridge Tied Load
> > >       arm64: dts: freescale: imx95-verdin: Add Cortex-M7 UART_4 overlay
> > >       arm64: dts: freescale: imx95-aquila: Add Cortex-M7 UART_4 overlay
> >
> > both reserved lpuart2, can you share one dtso?
>
> The comment in the DT file must be different because it's important to
> reference the actual board it applies to.
>
> So to fulfill this request we would need to add a common dtsi, include
> it from two different dtso files.

No, direct use one dtso. see

https://elixir.bootlin.com/linux/v7.3-rc3/source/arch/arm64/boot/dts/freescale/imx-pcie0-ep.dtso

And makefile to check how apply the same dtso for difference boards

Frank

>
> This to save 2 lines of duplicated code, `&lpuart2 { status = "reserved"; };`.
>
> To me this is just worst than the current proposal.
>
> Francesco
>
>