Re: [PATCH 1/3] arm64: dts: freescale: imx8-apalis: Add NAU8822 Bridge Tied Load

[Ernest Van Hoecke]

On Thu, Oct 01, 2026 at 10:43:10AM +0200, Ernest Van Hoecke wrote:
> From: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>
> 
> The NAU8822 on the Apalis Evaluation Board V1.2 can combine its two
> loudspeaker outputs into a Bridge Tied Load output. Add an overlay to
> select this mode when using the board with the Apalis iMX8.
> 
> The overlay is also combined with the Apalis iMX8QM V1.1 on Evaluation
> Board V1.2 device tree to provide a ready-to-use DTB. The codec and its
> routing are already described by the carrier device tree.
> 
> The overlay supports both Apalis iMX8QP and iMX8QM modules.
> 
> Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/freescale/Makefile                    |  6 ++++++
>  .../dts/freescale/imx8-apalis-eval-v1.2-nau8822-btl.dtso  | 15 +++++++++++++++
>  2 files changed, 21 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index 9971b34f7301..2732b223eb3d 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -801,13 +801,19 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mq-zii-ultra-zest.dtb
>  imx8mq-tqma8mq-mba8mx-lvds-tm070jvhg33-dtbs += imx8mq-tqma8mq-mba8mx.dtb imx8mq-tqma8mq-mba8mx-lvds-tm070jvhg33.dtbo
>  dtb-$(CONFIG_ARCH_MXC) += imx8mq-tqma8mq-mba8mx-lvds-tm070jvhg33.dtb
>  
> +dtb-$(CONFIG_ARCH_MXC) += imx8-apalis-eval-v1.2-nau8822-btl.dtbo
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-apalis-eval.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-apalis-eval-v1.2.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-apalis-ixora-v1.1.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-apalis-v1.1-eval.dtb
> +dtb-$(CONFIG_ARCH_MXC) += imx8qm-apalis-v1.1-eval-v1.2-nau8822-btl.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-apalis-v1.1-eval-v1.2.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-apalis-v1.1-ixora-v1.1.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-apalis-v1.1-ixora-v1.2.dtb
> +
> +imx8qm-apalis-v1.1-eval-v1.2-nau8822-btl-dtbs := imx8qm-apalis-v1.1-eval-v1.2.dtb \
> +	imx8-apalis-eval-v1.2-nau8822-btl.dtbo
> +
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-mek.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-tqma8qm-mba8x.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8qm-var-som-symphony.dtb
> diff --git a/arch/arm64/boot/dts/freescale/imx8-apalis-eval-v1.2-nau8822-btl.dtso b/arch/arm64/boot/dts/freescale/imx8-apalis-eval-v1.2-nau8822-btl.dtso
> new file mode 100644
> index 000000000000..b2f9c43d29cd
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8-apalis-eval-v1.2-nau8822-btl.dtso
> @@ -0,0 +1,15 @@
> +// SPDX-License-Identifier: GPL-2.0-only OR MIT
> +/*
> + * Copyright (c) Toradex
> + *
> + * Enable Bridge Tied Load (BTL) speaker mode on the Apalis Evaluation
> + * Board V1.2, combining the two loudspeaker outputs for higher output
> + * power.
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +&nau8822_1a {
> +	nuvoton,spk-btl;
> +};
> 
> -- 
> 2.43.0
> 

Hi Frank,

Patch 1/3 (imx8-apalis: Add NAU8822 Bridge Tied Load) is superseded by
the shared NAU8822 BTL overlay series:
https://lore.kernel.org/all/20261022-imx-nau8822-btl-v2-3-b4221ed43650@xxxxxxxxxxx/

Patches 2/3 and 3/3 are unchanged and still apply to imx/dt64 without
patch 1.

Best regards,
Ernest