imx8: disable uart with external pin

[dolrairom]

Hello, I am working on an image for a custom board with processor iMX 8QXP and I would like to have an enable pin for the uart in kernel, as the pcie has:

&pcieb{

    compatible = "fsl,imx8qxp-pcie","snps,dw-pcie";

    pinctrl-names = "default";

    pinctrl-0 = <&pinctrl_pcieb>;

    disable-gpio = <&lsio_gpio3 7 GPIO_ACTIVE_LOW>;

    reset-gpio = <&lsio_gpio4 0 GPIO_ACTIVE_LOW>;

    ext_osc = <1>;

    status = "okay";

};

Currently, I have my uart defined as:

&lpuart3 {

    pinctrl-names = "default";

    pinctrl-0 = <&pinctrl_lpuart3>;

    status = "okay";

};

    pinctrl_lpuart3: lpuart3grp {

        fsl,pins = <

            IMX8QXP_USDHC1_CLK_ADMA_UART3_RX        0x06000020

            IMX8QXP_USDHC1_DATA1_ADMA_UART3_TX      0x06000020

        >;

    };

Is it possible to define an external gpio to enable/disable the uart depending on the gpio state?

Thanks in advance!

[AldoG]

Hello,

No, this does not seem possible, please note that disable-gpio is an optional property for the PCIe binding.
I cannot find such property in the LPUART bindings.

Best regards,
Aldo.