[PATCH 1/1] arm64: dts: imx8qm: Add fsl, imx7ulp-lpuart compatible to lpuart

[Peng Fan]

> Subject: [PATCH 1/1] arm64: dts: imx8qm: Add fsl,imx7ulp-lpuart compatible
> to lpuart
> 
> After commit b4b844930f27 ("tty: serial: fsl_lpuart: drop earlycon entry for
> i.MX8QXP") earlycon support was essentially removed from imx8qm/imx8qxp
> due to missing compatible.
> The commit message says "i.MX8QXP lpuart is compatible with i.MX7ULP" so
> adding a fallback compatible should be fine.
> With this change early is supported again on imx8qm/imx8qxp.
> 
> Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>

Reviewed-by: Peng Fan <peng.fan at nxp.com>

> ---
> I get the following lines in my 5.10 kernel (backported this change):
> [    0.000000] earlycon: lpuart32 at MMIO32 0x000000005a060000
> (options '')
> [    0.000000] printk: bootconsole [lpuart32] enabled
> 
>  arch/arm64/boot/dts/freescale/imx8qm-ss-dma.dtsi | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8qm-ss-dma.dtsi
> b/arch/arm64/boot/dts/freescale/imx8qm-ss-dma.dtsi
> index bbe5f5ecfb92..3486b99ab6eb 100644
> --- a/arch/arm64/boot/dts/freescale/imx8qm-ss-dma.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8qm-ss-dma.dtsi
> @@ -19,19 +19,19 @@ uart4_lpcg: clock-controller at 5a4a0000 {  };
> 
>  &lpuart0 {
> -	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart";
> +	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart",
> +"fsl,imx7ulp-lpuart";
>  };
> 
>  &lpuart1 {
> -	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart";
> +	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart",
> +"fsl,imx7ulp-lpuart";
>  };
> 
>  &lpuart2 {
> -	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart";
> +	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart",
> +"fsl,imx7ulp-lpuart";
>  };
> 
>  &lpuart3 {
> -	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart";
> +	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart",
> +"fsl,imx7ulp-lpuart";
>  };
> 
>  &i2c0 {
> --
> 2.25.1