From: Frank Li <Frank.li@oss.nxp.com>
To: Ernest Van Hoecke <ernestvanhoecke@gmail.com>
Cc: Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>, Frank Li <Frank.Li@nxp.com>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
Kieran Bingham <kieran.bingham@ideasonboard.com>,
Francesco Dolcini <francesco.dolcini@toradex.com>,
Dave Stevenson <dave.stevenson@raspberrypi.com>,
devicetree@vger.kernel.org, imx@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
Subject: Re: [PATCH v2 2/6] arm64: dts: freescale: imx8mp-verdin: Add Cortex-M7 UART_4 overlay
Date: Thu, 1 Oct 2026 09:18:24 -0500 [thread overview]
Message-ID: <ar5rsOuGAHdqDfKB@SMW015318> (raw)
In-Reply-To: <20261001-verdin-imx8mp-hmp-camera-ready-v2-2-7d1343ecd3ec@toradex.com>
On Thu, Oct 01, 2026 at 01:44:10PM +0200, Ernest Van Hoecke wrote:
> From: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
>
> Verdin UART_4 can be assigned to Cortex-M7 firmware. Add an overlay
> that marks the UART as reserved so Linux does not claim the port.
>
> The overlay is also combined with the Verdin iMX8M Plus Development
> Board device tree to provide a ready-to-use DTB for the non-WiFi SoM
> variant. UART_4 carries Bluetooth on WiFi SoMs.
>
> Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
> ---
> arch/arm64/boot/dts/freescale/Makefile | 3 +++
> arch/arm64/boot/dts/freescale/imx8mp-verdin-uart4-mcu.dtso | 14 ++++++++++++++
I remember at another thread said, use imx-uart4-mcu.dtso for all uart4
case. It doesn't affect ov5460 part.
Frank
> 2 files changed, 17 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index 23e2684d6923..649be5b6aab4 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -736,6 +736,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dahlia-dsi-to-hdmi.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dahlia-panel-cap-touch-10inch-dsi.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dahlia.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dev-dsi-to-hdmi.dtb
> +dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dev-uart4-mcu.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dev.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-ivy.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-mallow.dtb
> @@ -744,6 +745,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-yavia.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-zinnia.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-panel-cap-touch-10inch-dsi.dtbo
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-panel-cap-touch-7inch-dsi.dtbo
> +dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-uart4-mcu.dtbo
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-wifi-dahlia-dsi-to-hdmi.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-wifi-dahlia-panel-cap-touch-10inch-dsi.dtb
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-wifi-dahlia.dtb
> @@ -761,6 +763,7 @@ imx8mp-verdin-nonwifi-dahlia-dsi-to-hdmi-dtbs := imx8mp-verdin-nonwifi-dahlia.dt
> imx8mp-verdin-nonwifi-dahlia-panel-cap-touch-10inch-dsi-dtbs := imx8mp-verdin-nonwifi-dahlia.dtb \
> imx8mp-verdin-panel-cap-touch-10inch-dsi.dtbo
> imx8mp-verdin-nonwifi-dev-dsi-to-hdmi-dtbs := imx8mp-verdin-nonwifi-dev.dtb imx8mp-verdin-dsi-to-hdmi.dtbo
> +imx8mp-verdin-nonwifi-dev-uart4-mcu-dtbs := imx8mp-verdin-nonwifi-dev.dtb imx8mp-verdin-uart4-mcu.dtbo
> imx8mp-verdin-nonwifi-yavia-dsi-to-hdmi-dtbs := imx8mp-verdin-nonwifi-yavia.dtb imx8mp-verdin-dsi-to-hdmi.dtbo
> imx8mp-verdin-wifi-dahlia-dsi-to-hdmi-dtbs := imx8mp-verdin-wifi-dahlia.dtb imx8mp-verdin-dsi-to-hdmi.dtbo
> imx8mp-verdin-wifi-dahlia-panel-cap-touch-10inch-dsi-dtbs := imx8mp-verdin-wifi-dahlia.dtb \
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-verdin-uart4-mcu.dtso b/arch/arm64/boot/dts/freescale/imx8mp-verdin-uart4-mcu.dtso
> new file mode 100644
> index 000000000000..74d90b39faec
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin-uart4-mcu.dtso
> @@ -0,0 +1,14 @@
> +// SPDX-License-Identifier: GPL-2.0-only OR MIT
> +/*
> + * Copyright (c) Toradex
> + *
> + * Verdin iMX8M Plus UART_4 for Cortex-M7
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +/* Verdin UART_4 */
> +&uart4 {
> + status = "reserved";
> +};
>
> --
> 2.43.0
>
>
next prev parent reply other threads:[~2026-10-01 14:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-01 11:44 [PATCH v2 0/6] arm64: dts: freescale: Add Verdin iMX8M OV5640 and Verdin iMX8MP M7 support Ernest Van Hoecke
2026-10-01 11:44 ` [PATCH v2 1/6] arm64: dts: freescale: imx8mp-verdin: Add Cortex-M7 remoteproc Ernest Van Hoecke
2026-10-01 14:19 ` Frank Li
2026-10-02 8:32 ` Ernest Van Hoecke
2026-10-01 11:44 ` [PATCH v2 2/6] arm64: dts: freescale: imx8mp-verdin: Add Cortex-M7 UART_4 overlay Ernest Van Hoecke
2026-10-01 14:18 ` Frank Li [this message]
2026-10-01 11:44 ` [PATCH v2 3/6] dt-bindings: connector: Add Toradex camera connector Ernest Van Hoecke
2026-10-01 14:14 ` Frank Li
2026-10-02 17:05 ` Conor Dooley
2026-10-11 21:04 ` Conor Dooley
2026-10-01 11:44 ` [PATCH v2 4/6] arm64: dts: freescale: imx8m{m,p}-verdin: Add camera connector nexus Ernest Van Hoecke
2026-10-01 11:44 ` [PATCH v2 5/6] arm64: dts: freescale: imx8m{m,p}-verdin: Add shared OV5640 overlays Ernest Van Hoecke
2026-10-01 11:44 ` [PATCH v2 6/6] arm64: dts: freescale: imx8mp-verdin: Add mezzanine " Ernest Van Hoecke
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