--- zzzz-none-000/linux-4.4.271/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt	2023-04-19 10:22:27.000000000 +0000
@@ -32,6 +32,8 @@
 - qcom,rx-crci: Identificator <u32> for Client Rate Control Interface to be
            used with RX DMA channel. Required when using DMA for reception
            with UARTDM v1.3 and bellow.
+- serial_clk: Required to set the clock rate when its not passing from boot
+            loader such as u-boot.
 
 Note: Aliases may be defined to ensure the correct ordering of the UARTs.
 The alias serialN will result in the UART being assigned port N.  If any