4 files changed, 97 insertions, 3 deletions

diff --git a/Documentation/devicetree/bindings/serial/nvidia,tegra20-hsuart.txt b/Documentation/devicetree/bindings/serial/nvidia,tegra20-hsuart.txt
new file mode 100644
index 000000000000..392a4493eebd
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/nvidia,tegra20-hsuart.txt
@@ -0,0 +1,24 @@
+NVIDIA Tegra20/Tegra30 high speed (DMA based) UART controller driver.
+
+Required properties:
+- compatible : should be "nvidia,tegra30-hsuart", "nvidia,tegra20-hsuart".
+- reg: Should contain UART controller registers location and length.
+- interrupts: Should contain UART controller interrupts.
+- nvidia,dma-request-selector : The Tegra DMA controller's phandle and
+  request selector for this UART controller.
+
+Optional properties:
+- nvidia,enable-modem-interrupt: Enable modem interrupts. Should be enable
+                only if all 8 lines of UART controller are pinmuxed.
+
+Example:
+
+serial@70006000 {
+        compatible = "nvidia,tegra30-hsuart", "nvidia,tegra20-hsuart";
+        reg = <0x70006000 0x40>;
+        reg-shift = <2>;
+        interrupts = <0 36 0x04>;
+        nvidia,dma-request-selector = <&apbdma 8>;
+        nvidia,enable-modem-interrupt;
+        status = "disabled";
+};
diff --git a/Documentation/devicetree/bindings/tty/serial/arc-uart.txt b/Documentation/devicetree/bindings/tty/serial/arc-uart.txt
new file mode 100644
index 000000000000..5cae2eb686f8
--- /dev/null
+++ b/Documentation/devicetree/bindings/tty/serial/arc-uart.txt
@@ -0,0 +1,26 @@
+* Synopsys ARC UART : Non standard UART used in some of the ARC FPGA boards
+
+Required properties:
+- compatible            : "snps,arc-uart"
+- reg                   : offset and length of the register set for the device.
+- interrupts            : device interrupt
+- clock-frequency       : the input clock frequency for the UART
+- current-speed         : baud rate for UART
+
+e.g.
+
+arcuart0: serial@c0fc1000 {
+        compatible = "snps,arc-uart";
+        reg = <0xc0fc1000 0x100>;
+        interrupts = <5>;
+        clock-frequency = <80000000>;
+        current-speed = <115200>;
+        status = "okay";
+};
+
+Note: Each port should have an alias correctly numbered in "aliases" node.
+
+e.g.
+aliases {
+        serial0 = &arcuart0;
+};
diff --git a/Documentation/devicetree/bindings/tty/serial/efm32-uart.txt b/Documentation/devicetree/bindings/tty/serial/efm32-uart.txt
index 6588b6950a7f..8e080b893b49 100644
--- a/Documentation/devicetree/bindings/tty/serial/efm32-uart.txt
+++ b/Documentation/devicetree/bindings/tty/serial/efm32-uart.txt
@@ -5,10 +5,16 @@ Required properties:
 - reg : Address and length of the register set
 - interrupts : Should contain uart interrupt
 
+Optional properties:
+- location : Decides the location of the USART I/O pins.
+  Allowed range : [0 .. 5]
+  Default: 0
+
 Example:
 
 uart@0x4000c400 {
         compatible = "efm32,uart";
         reg = <0x4000c400 0x400>;
         interrupts = <15>;
+        location = <0>;
 };
diff --git a/Documentation/serial/driver b/Documentation/serial/driver
index 0a25a9191864..067c47d46917 100644
--- a/Documentation/serial/driver
+++ b/Documentation/serial/driver
@@ -133,6 +133,16 @@ hardware.
         Interrupts: locally disabled.
         This call must not sleep
 
+  send_xchar(port,ch)
+        Transmit a high priority character, even if the port is stopped.
+        This is used to implement XON/XOFF flow control and tcflow().  If
+        the serial driver does not implement this function, the tty core
+        will append the character to the circular buffer and then call
+        start_tx() / stop_tx() to flush the data out.
+
+        Locking: none.
+        Interrupts: caller dependent.
+
   stop_rx(port)
         Stop receiving characters; the port is in the process of
         being closed.
@@ -242,9 +252,8 @@ hardware.
 
   pm(port,state,oldstate)
         Perform any power management related activities on the specified
-        port.  State indicates the new state (defined by ACPI D0-D3),
-        oldstate indicates the previous state.  Essentially, D0 means
-        fully on, D3 means powered down.
+        port.  State indicates the new state (defined by
+        enum uart_pm_state), oldstate indicates the previous state.
 
         This function should not be used to grab any resources.
 
@@ -255,6 +264,10 @@ hardware.
         Locking: none.
         Interrupts: caller dependent.
 
+  set_wake(port,state)
+        Enable/disable power management wakeup on serial activity.  Not
+        currently implemented.
+
   type(port)
         Return a pointer to a string constant describing the specified
         port, or return NULL, in which case the string 'unknown' is
@@ -307,6 +320,31 @@ hardware.
         Locking: none.
         Interrupts: caller dependent.
 
+  poll_init(port)
+        Called by kgdb to perform the minimal hardware initialization needed
+        to support poll_put_char() and poll_get_char().  Unlike ->startup()
+        this should not request interrupts.
+
+        Locking: tty_mutex and tty_port->mutex taken.
+        Interrupts: n/a.
+
+  poll_put_char(port,ch)
+        Called by kgdb to write a single character directly to the serial
+        port.  It can and should block until there is space in the TX FIFO.
+
+        Locking: none.
+        Interrupts: caller dependent.
+        This call must not sleep
+
+  poll_get_char(port)
+        Called by kgdb to read a single character directly from the serial
+        port.  If data is available, it should be returned; otherwise
+        the function should return NO_POLL_CHAR immediately.
+
+        Locking: none.
+        Interrupts: caller dependent.
+        This call must not sleep
+
 Other functions
 ---------------