msm_serial: Add devicetree support

Add devicetree support to the msm_serial driver.  Clocks are still
queried by direct name from the driver until device tree clock support
is implemented.

Change-Id: Ia6b2ddfcf1e5dc3bd25dd502662f971202e6d56f
Signed-off-by: David Brown <davidb@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 27 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/tty/serial/msm_serial.txt b/Documentation/devicetree/bindings/tty/serial/msm_serial.txt
new file mode 100644
index 000000000000..aef383eb8876
--- /dev/null
+++ b/Documentation/devicetree/bindings/tty/serial/msm_serial.txt
@@ -0,0 +1,27 @@
+* Qualcomm MSM UART
+
+Required properties:
+- compatible :
+        - "qcom,msm-uart", and one of "qcom,msm-hsuart" or
+          "qcom,msm-lsuart".
+- reg : offset and length of the register set for the device
+        for the hsuart operating in compatible mode, there should be a
+        second pair describing the gsbi registers.
+- interrupts : should contain the uart interrupt.
+
+There are two different UART blocks used in MSM devices,
+"qcom,msm-hsuart" and "qcom,msm-lsuart".  The msm-serial driver is
+able to handle both of these, and matches against the "qcom,msm-uart"
+as the compatibility.
+
+The registers for the "qcom,msm-hsuart" device need to specify both
+register blocks, even for the common driver.
+
+Example:
+
+        uart@19c400000 {
+                compatible = "qcom,msm-hsuart", "qcom,msm-uart";
+                reg = <0x19c40000 0x1000>,
+                      <0x19c00000 0x1000>;
+                interrupts = <195>;
+        };