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arm64: dts: freescale: imx95-toradex-smarc: Use gpio-hog for WIFI_UART_EN

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On the Toradex SMARC iMX95, the WiFi UART signals are shared with the
JTAG. The WIFI_UART_EN signal is used to select between these
two functions. A GPIO hog is used to select the UART function by
default. This DT file is going to be used by both Linux and the boot
firmware, and the boot firmware will configure the GPIO hog way before
the Linux kernel is booted, therefore there is no actual race condition
between the Linux kernel BT UART driver and GPIO hog probe.

Configure WIFI_UART_EN as a gpio-hog driven high.

Signed-off-by: Franz Schnyder <franz.schnyder@toradex.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
This commit is contained in:
Franz Schnyder 2026-03-26 15:37:06 +01:00 committed by Frank Li
parent 104a391bb6
commit a05af625aa
1 changed files with 7 additions and 0 deletions
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7
arch/arm64/boot/dts/freescale/imx95-toradex-smarc.dtsi
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@ -451,6 +451,13 @@ som_gpio_expander_1: gpio@21 {
"",
"",
"SMARC_SDIO_WP";
wifi-uart-en-hog {
gpio-hog;
gpios = <12 GPIO_ACTIVE_HIGH>;
line-name = "WIFI_UART_EN";
output-high;
};
};
embedded-controller@28 {