Add Freescale lpuart driver support. The lpuart device
can be found on Vybrid VF610 and Layerscape LS-1 SoCs.

Signed-off-by: Jingchang Lu <redacted>
Acked-by: Shawn Guo <redacted>
---
changes in v5:
 Coding style fix, remove redundant code.
 Checking clk_prepare_enable return value.
 Using devm_ioremap_resource instead of devm_request_and_ioremap.

changes in v4:
 Change Vybrid VF610 SoC compatible string to "fsl,vf610-lpuart"

changes in v3:
 Use general driver name lpuart instead of mvf for further share between SoCs.
 Add bind doc in Documentation/devicetree/bindings/tty/serial.
 Remove unused #include header lines and clean up code.

changes in v2:
 Remove unused variables and clean up the code.

 .../devicetree/bindings/tty/serial/fsl-lpuart.txt  |  14 +
 drivers/tty/serial/Kconfig                         |  14 +
 drivers/tty/serial/Makefile                        |   1 +
 drivers/tty/serial/fsl_lpuart.c                    | 873 +++++++++++++++++++++
 include/uapi/linux/serial_core.h                   |   3 +
 5 files changed, 905 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/tty/serial/fsl-lpuart.txt
 create mode 100644 drivers/tty/serial/fsl_lpuart.c

diff --git a/Documentation/devicetree/bindings/tty/serial/fsl-lpuart.txt b/Documentation/devicetree/bindings/tty/serial/fsl-lpuart.txt
new file mode 100644
index 0000000..6fd1dd1
--- /dev/null
+++ b/Documentation/devicetree/bindings/tty/serial/fsl-lpuart.txt

@@ -0,0 +1,14 @@
+* Freescale low power universal asynchronous receiver/transmitter (lpuart)
+
+Required properties:
+- compatible : Should be "fsl,<soc>-lpuart"
+- reg : Address and length of the register set for the device
+- interrupts : Should contain uart interrupt
+
+Example:
+
+uart0: serial@40027000 {
+	       compatible = "fsl,vf610-lpuart";
+	       reg = <0x40027000 0x1000>;
+	       interrupts = <0 61 0x00>;
+       };

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 7e7006f..aee7030 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig

@@ -1484,6 +1484,20 @@ config SERIAL_RP2_NR_UARTS
 	  If multiple cards are present, the default limit of 32 ports may
 	  need to be increased.
 
+config SERIAL_FSL_LPUART
+	bool "Freescale lpuart serial port support"