linux/Documentation/devicetree/bindings/tty/serial/msm_serial.txt
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   1* Qualcomm MSM UART
   2
   3Required properties:
   4- compatible :
   5        - "qcom,msm-uart", and one of "qcom,msm-hsuart" or
   6          "qcom,msm-lsuart".
   7- reg : offset and length of the register set for the device
   8        for the hsuart operating in compatible mode, there should be a
   9        second pair describing the gsbi registers.
  10- interrupts : should contain the uart interrupt.
  11
  12There are two different UART blocks used in MSM devices,
  13"qcom,msm-hsuart" and "qcom,msm-lsuart".  The msm-serial driver is
  14able to handle both of these, and matches against the "qcom,msm-uart"
  15as the compatibility.
  16
  17The registers for the "qcom,msm-hsuart" device need to specify both
  18register blocks, even for the common driver.
  19
  20Example:
  21
  22        uart@19c400000 {
  23                compatible = "qcom,msm-hsuart", "qcom,msm-uart";
  24                reg = <0x19c40000 0x1000>,
  25                      <0x19c00000 0x1000>;
  26                interrupts = <195>;
  27        };
  28