[PATCH 1/9] ARM: dts: imx6ul-kontron-bl-common: Replace UART3 with DIP switch GPIOs

[Frank Li]

On Tue, Sep 08, 2026 at 03:51:48PM +0200, Frieder Schrempf wrote:
> From: Eberhard Stoll <eberhard.stoll at kontron.de>
>
> The latest board revision has DIP switches and lacks UART3 instead.
> As the old revision has long been deprecated and not maintained
> anymore, drop the support and reflect the current state of the
> hardware. As the old revision hasn't been widely used, UART3 was
> only available through an obscure extension connector and we have
> carried this patch downstream for years, no users are expected to
> be affected by this change.

Remove "we have carried this patch downstream for years".

>
> Signed-off-by: Eberhard Stoll <eberhard.stoll at kontron.de>
> Signed-off-by: Frieder Schrempf <frieder.schrempf at kontron.de>
> ---
>  .../boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi  | 21 +++++----------------
>  1 file changed, 5 insertions(+), 16 deletions(-)
>
> diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi
> index f4c45e964daf..a71669bef7d4 100644
> --- a/arch/arm/boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi
> +++ b/arch/arm/boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi
> @@ -172,13 +172,6 @@ &uart2 {
>  	status = "okay";
>  };
>
> -&uart3 {
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&pinctrl_uart3>;
> -	uart-has-rtscts;
> -	status = "okay";
> -};
> -
>  &uart4 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_uart4>;
> @@ -283,6 +276,11 @@ MX6UL_PAD_SNVS_TAMPER5__GPIO5_IO05	0x1b0b0	/* DOUT1 */
>  			MX6UL_PAD_SNVS_TAMPER4__GPIO5_IO04	0x1b0b0	/* DIN1 */
>  			MX6UL_PAD_SNVS_TAMPER1__GPIO5_IO01	0x1b0b0	/* DOUT2 */
>  			MX6UL_PAD_SNVS_TAMPER0__GPIO5_IO00	0x1b0b0	/* DIN2 */
> +
> +			MX6UL_PAD_UART3_TX_DATA__GPIO1_IO24	0x1b0b0	/* CAN_ADR0 (DIP sw 1) */
> +			MX6UL_PAD_UART3_RX_DATA__GPIO1_IO25	0x1b0b0	/* CAN_ADR1 (DIP sw 2) */
> +			MX6UL_PAD_UART3_CTS_B__GPIO1_IO26	0x1b0b0	/* CAN_ADR2 (DIP sw 3) */
> +			MX6UL_PAD_UART3_RTS_B__GPIO1_IO27	0x1b0b0	/* CAN_ADR3 (DIP sw 4) */

supposed header overlay or real user should set it. otherwise, the real
user set it will be failure because pin conflict.

Frank
>  		>;
>  	};
>
> @@ -334,15 +332,6 @@ MX6UL_PAD_NAND_DATA07__UART2_DCE_RTS	0x1b0b1
>  		>;
>  	};
>
> -	pinctrl_uart3: uart3grp {
> -		fsl,pins = <
> -			MX6UL_PAD_UART3_TX_DATA__UART3_DCE_TX	0x1b0b1
> -			MX6UL_PAD_UART3_RX_DATA__UART3_DCE_RX	0x1b0b1
> -			MX6UL_PAD_UART3_CTS_B__UART3_DCE_CTS	0x1b0b1
> -			MX6UL_PAD_UART3_RTS_B__UART3_DCE_RTS	0x1b0b1
> -		>;
> -	};
> -
>  	pinctrl_uart4: uart4grp {
>  		fsl,pins = <
>  			MX6UL_PAD_UART4_TX_DATA__UART4_DCE_TX	0x1b0b1
>
> --
> 2.55.0
>
>