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

[Alexander Stein]

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>
---
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