Merge tag 'tty-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/…

…git/gregkh/tty

Pull tty/serial patches from Greg Kroah-Hartman:
 "Here's the big tty/serial driver patches for 3.9-rc1.

  More tty port rework and fixes from Jiri here, as well as lots of
  individual serial driver updates and fixes.

  All of these have been in the linux-next tree for a while."

* tag 'tty-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (140 commits)
  tty: mxser: improve error handling in mxser_probe() and mxser_module_init()
  serial: imx: fix uninitialized variable warning
  serial: tegra: assume CONFIG_OF
  TTY: do not update atime/mtime on read/write
  lguest: select CONFIG_TTY to build properly.
  ARM defconfigs: add missing inclusions of linux/platform_device.h
  fb/exynos: include platform_device.h
  ARM: sa1100/assabet: include platform_device.h directly
  serial: imx: Fix recursive locking bug
  pps: Fix build breakage from decoupling pps from tty
  tty: Remove ancient hardpps()
  pps: Additional cleanups in uart_handle_dcd_change
  pps: Move timestamp read into PPS code proper
  pps: Don't crash the machine when exiting will do
  pps: Fix a use-after free bug when unregistering a source.
  pps: Use pps_lookup_dev to reduce ldisc coupling
  pps: Add pps_lookup_dev() function
  tty: serial: uartlite: Support uartlite on big and little endian systems
  tty: serial: uartlite: Fix sparse and checkpatch warnings
  serial/arc-uart: Miscll DT related updates (Grant's review comments)
  ...

Fix up trivial conflicts, mostly just due to the TTY config option
clashing with the EXPERIMENTAL removal.

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";
+};

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;
+};

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>;
 };

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
 ---------------
 

arch/alpha/Kconfig

@@ -124,6 +124,7 @@ choice
 
 config ALPHA_GENERIC
 	bool "Generic"
+	depends on TTY
 	help
 	  A generic kernel will run on all supported Alpha hardware.
 
@@ -490,6 +491,7 @@ config VGA_HOSE
 
 config ALPHA_SRM
 	bool "Use SRM as bootloader" if ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS || ALPHA_NONAME
+	depends on TTY
 	default y if ALPHA_JENSEN || ALPHA_MIKASA || ALPHA_SABLE || ALPHA_LYNX || ALPHA_NORITAKE || ALPHA_DP264 || ALPHA_RAWHIDE || ALPHA_EIGER || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
 	---help---
 	  There are two different types of booting firmware on Alphas: SRM,

arch/alpha/kernel/srmcons.c

@@ -44,21 +44,21 @@ typedef union _srmcons_result {
 
 /* called with callback_lock held */
 static int
-srmcons_do_receive_chars(struct tty_struct *tty)
+srmcons_do_receive_chars(struct tty_port *port)
 {
 	srmcons_result result;
 	int count = 0, loops = 0;
 
 	do {
 		result.as_long = callback_getc(0);
 		if (result.bits.status < 2) {
-			tty_insert_flip_char(tty, (char)result.bits.c, 0);
+			tty_insert_flip_char(port, (char)result.bits.c, 0);
 			count++;
 		}
 	} while((result.bits.status & 1) && (++loops < 10));
 
 	if (count)
-		tty_schedule_flip(tty);
+		tty_schedule_flip(port);
 
 	return count;
 }
@@ -73,7 +73,7 @@ srmcons_receive_chars(unsigned long data)
 
 	local_irq_save(flags);
 	if (spin_trylock(&srmcons_callback_lock)) {
-		if (!srmcons_do_receive_chars(port->tty))
+		if (!srmcons_do_receive_chars(port))
 			incr = 100;
 		spin_unlock(&srmcons_callback_lock);
 	} 
@@ -88,7 +88,7 @@ srmcons_receive_chars(unsigned long data)
 
 /* called with callback_lock held */
 static int
-srmcons_do_write(struct tty_struct *tty, const char *buf, int count)
+srmcons_do_write(struct tty_port *port, const char *buf, int count)
 {
 	static char str_cr[1] = "\r";
 	long c, remaining = count;
@@ -113,10 +113,10 @@ srmcons_do_write(struct tty_struct *tty, const char *buf, int count)
 			cur += result.bits.c;
 
 			/*
-			 * Check for pending input iff a tty was provided
+			 * Check for pending input iff a tty port was provided
 			 */
-			if (tty)
-				srmcons_do_receive_chars(tty);
+			if (port)
+				srmcons_do_receive_chars(port);
 		}
 
 		while (need_cr) {
@@ -135,7 +135,7 @@ srmcons_write(struct tty_struct *tty,
 	unsigned long flags;
 
 	spin_lock_irqsave(&srmcons_callback_lock, flags);
-	srmcons_do_write(tty, (const char *) buf, count);
+	srmcons_do_write(tty->port, (const char *) buf, count);
 	spin_unlock_irqrestore(&srmcons_callback_lock, flags);
 
 	return count;

arch/arm/boot/dts/vt8500.dtsi

@@ -45,6 +45,38 @@
 					compatible = "fixed-clock";
 					clock-frequency = <24000000>;
 				};
+
+				clkuart0: uart0 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <1>;
+				};
+
+				clkuart1: uart1 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <2>;
+				};
+
+				clkuart2: uart2 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <3>;
+				};
+
+				clkuart3: uart3 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <4>;
+				};
 			};
 		};
 
@@ -83,28 +115,28 @@
 			compatible = "via,vt8500-uart";
 			reg = <0xd8200000 0x1040>;
 			interrupts = <32>;
-			clocks = <&ref24>;
+			clocks = <&clkuart0>;
 		};
 
 		uart@d82b0000 {
 			compatible = "via,vt8500-uart";
 			reg = <0xd82b0000 0x1040>;
 			interrupts = <33>;
-			clocks = <&ref24>;
+			clocks = <&clkuart1>;
 		};
 
 		uart@d8210000 {
 			compatible = "via,vt8500-uart";
 			reg = <0xd8210000 0x1040>;
 			interrupts = <47>;
-			clocks = <&ref24>;
+			clocks = <&clkuart2>;
 		};
 
 		uart@d82c0000 {
 			compatible = "via,vt8500-uart";
 			reg = <0xd82c0000 0x1040>;
 			interrupts = <50>;
-			clocks = <&ref24>;
+			clocks = <&clkuart3>;
 		};
 
 		rtc@d8100000 {

arch/arm/boot/dts/wm8505.dtsi

@@ -59,6 +59,54 @@
 					compatible = "fixed-clock";
 					clock-frequency = <24000000>;
 				};
+
+				clkuart0: uart0 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <1>;
+				};
+
+				clkuart1: uart1 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <2>;
+				};
+
+				clkuart2: uart2 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <3>;
+				};
+
+				clkuart3: uart3 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <4>;
+				};
+
+				clkuart4: uart4 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <22>;
+				};
+
+				clkuart5: uart5 {
+					#clock-cells = <0>;
+					compatible = "via,vt8500-device-clock";
+					clocks = <&ref24>;
+					enable-reg = <0x250>;
+					enable-bit = <23>;
+				};
 			};
 		};
 
@@ -96,42 +144,42 @@
 			compatible = "via,vt8500-uart";
 			reg = <0xd8200000 0x1040>;
 			interrupts = <32>;
-			clocks = <&ref24>;
+			clocks = <&clkuart0>;
 		};
 
 		uart@d82b0000 {
 			compatible = "via,vt8500-uart";
 			reg = <0xd82b0000 0x1040>;
 			interrupts = <33>;
-			clocks = <&ref24>;
+			clocks = <&clkuart1>;
 		};
 
 		uart@d8210000 {
 			compatible = "via,vt8500-uart";
 			reg = <0xd8210000 0x1040>;
 			interrupts = <47>;
-			clocks = <&ref24>;
+			clocks = <&clkuart2>;
 		};
 
 		uart@d82c0000 {
 			compatible = "via,vt8500-uart";
 			reg = <0xd82c0000 0x1040>;
 			interrupts = <50>;
-			clocks = <&ref24>;
+			clocks = <&clkuart3>;
 		};
 
 		uart@d8370000 {
 			compatible = "via,vt8500-uart";
 			reg = <0xd8370000 0x1040>;
 			interrupts = <31>;
-			clocks = <&ref24>;
+			clocks = <&clkuart4>;
 		};
 
 		uart@d8380000 {
 			compatible = "via,vt8500-uart";
 			reg = <0xd8380000 0x1040>;
 			interrupts = <30>;
-			clocks = <&ref24>;
+			clocks = <&clkuart5>;
 		};
 
 		rtc@d8100000 {