Merge tag 'tty-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver updates from Greg KH:
 "Here's the tty and serial driver patches for 4.2-rc1.

  A number of individual driver updates, some code cleanups, and other
  minor things, full details in the shortlog.

  All have been in linux-next for a while with no reported issues"

* tag 'tty-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (152 commits)
  Doc: serial-rs485.txt: update RS485 driver interface
  Doc: tty.txt: remove mention of the BKL
  MAINTAINERS: tty: add serial docs directory
  serial: sprd: check for NULL after calling devm_clk_get
  serial: 8250_pci: Correct uartclk for xr17v35x expansion chips
  serial: 8250_pci: Add support for 12 port Exar boards
  serial: 8250_uniphier: add bindings document for UniPhier UART
  serial: core: cleanup in uart_get_baud_rate()
  serial: stm32-usart: Add STM32 USART Driver
  tty/serial: kill off set_irq_flags usage
  tty: move linux/gsmmux.h to uapi
  doc: dt: add documentation for nxp,lpc1850-uart
  serial: 8250: add LPC18xx/43xx UART driver
  serial: 8250_uniphier: add UniPhier serial driver
  serial: 8250_dw: support ACPI platforms with integrated DMA engine
  serial: of_serial: check the return value of clk_prepare_enable()
  serial: of_serial: use devm_clk_get() instead of clk_get()
  serial: earlycon: Add support for big-endian MMIO accesses
  serial: sirf: use hrtimer for data rx
  serial: sirf: correct the fifo empty_bit
  ...

10 files changed, 126 insertions, 68 deletions

diff --git a/Documentation/devicetree/bindings/serial/arm_sbsa_uart.txt b/Documentation/devicetree/bindings/serial/arm_sbsa_uart.txt
new file mode 100644
index 000000000000..4163e7eb7763
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/arm_sbsa_uart.txt
@@ -0,0 +1,10 @@
+* ARM SBSA defined generic UART
+This UART uses a subset of the PL011 registers and consequently lives
+in the PL011 driver. It's baudrate and other communication parameters
+cannot be adjusted at runtime, so it lacks a clock specifier here.
+
+Required properties:
+- compatible: must be "arm,sbsa-uart"
+- reg: exactly one register range
+- interrupts: exactly one interrupt specifier
+- current-speed: the (fixed) baud rate set by the firmware
diff --git a/Documentation/devicetree/bindings/serial/mtk-uart.txt b/Documentation/devicetree/bindings/serial/mtk-uart.txt
index 44152261e5c5..8d63f1da07aa 100644
--- a/Documentation/devicetree/bindings/serial/mtk-uart.txt
+++ b/Documentation/devicetree/bindings/serial/mtk-uart.txt
@@ -14,7 +14,14 @@ Required properties:
 
 - interrupts: A single interrupt specifier.
 
-- clocks: Clock driving the hardware.
+- clocks : Must contain an entry for each entry in clock-names.
+  See ../clocks/clock-bindings.txt for details.
+- clock-names:
+  - "baud": The clock the baudrate is derived from
+  - "bus": The bus clock for register accesses (optional)
+
+For compatibility with older device trees an unnamed clock is used for the
+baud clock if the baudclk does not exist. Do not use this for new designs.
 
 Example:
 
@@ -22,5 +29,6 @@ Example:
 		compatible = "mediatek,mt6589-uart", "mediatek,mt6577-uart";
 		reg = <0x11006000 0x400>;
 		interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_LOW>;
-		clocks = <&uart_clk>;
+		clocks = <&uart_clk>, <&bus_clk>;
+		clock-names = "baud", "bus";
 	};
diff --git a/Documentation/devicetree/bindings/serial/nxp,lpc1850-uart.txt b/Documentation/devicetree/bindings/serial/nxp,lpc1850-uart.txt
new file mode 100644
index 000000000000..04e23e63ee4f
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/nxp,lpc1850-uart.txt
@@ -0,0 +1,28 @@
+* NXP LPC1850 UART
+
+Required properties:
+- compatible	: "nxp,lpc1850-uart", "ns16550a".
+- reg		: offset and length of the register set for the device.
+- interrupts	: should contain uart interrupt.
+- clocks	: phandle to the input clocks.
+- clock-names	: required elements: "uartclk", "reg".
+
+Optional properties:
+- dmas		: Two or more DMA channel specifiers following the
+		  convention outlined in bindings/dma/dma.txt
+- dma-names	: Names for the dma channels, if present. There must
+		  be at least one channel named "tx" for transmit
+		  and named "rx" for receive.
+
+Since it's also possible to also use the of_serial.c driver all
+parameters from 8250.txt also apply but are optional.
+
+Example:
+uart0: serial@40081000 {
+	compatible = "nxp,lpc1850-uart", "ns16550a";
+	reg = <0x40081000 0x1000>;
+	reg-shift = <2>;
+	interrupts = <24>;
+	clocks = <&ccu2 CLK_APB0_UART0>, <&ccu1 CLK_CPU_UART0>;
+	clock-names = "uartclk", "reg";
+};
diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
index 246c795668dc..fbfe53635a3a 100644
--- a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
+++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
@@ -1,4 +1,5 @@
 * NXP SC16IS7xx advanced Universal Asynchronous Receiver-Transmitter (UART)
+* i2c as bus
 
 Required properties:
 - compatible: Should be one of the following:
@@ -31,3 +32,39 @@ Example:
                 gpio-controller;
                 #gpio-cells = <2>;
         };
+
+* spi as bus
+
+Required properties:
+- compatible: Should be one of the following:
+  - "nxp,sc16is740" for NXP SC16IS740,
+  - "nxp,sc16is741" for NXP SC16IS741,
+  - "nxp,sc16is750" for NXP SC16IS750,
+  - "nxp,sc16is752" for NXP SC16IS752,
+  - "nxp,sc16is760" for NXP SC16IS760,
+  - "nxp,sc16is762" for NXP SC16IS762.
+- reg: SPI chip select number.
+- interrupt-parent: The phandle for the interrupt controller that
+  services interrupts for this IC.
+- interrupts: Specifies the interrupt source of the parent interrupt
+  controller. The format of the interrupt specifier depends on the
+  parent interrupt controller.
+- clocks: phandle to the IC source clock.
+
+Optional properties:
+- gpio-controller: Marks the device node as a GPIO controller.
+- #gpio-cells: Should be two. The first cell is the GPIO number and
+  the second cell is used to specify the GPIO polarity:
+    0 = active high,
+    1 = active low.
+
+Example:
+	sc16is750: sc16is750@0 {
+		compatible = "nxp,sc16is750";
+		reg = <0>;
+		clocks = <&clk20m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
index 7534d46e9ad8..e84b13a8eda3 100644
--- a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
+++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
@@ -45,6 +45,11 @@ Required properties:
 Note: Each enabled SCIx UART should have an alias correctly numbered in the
 "aliases" node.
 
+Optional properties:
+  - dmas: Must contain a list of two references to DMA specifiers, one for
+	  transmission, and one for reception.
+  - dma-names: Must contain a list of two DMA names, "tx" and "rx".
+
 Example:
 	aliases {
 		serial0 = &scifa0;
@@ -57,4 +62,6 @@ Example:
 		interrupts = <0 144 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&mstp2_clks R8A7790_CLK_SCIFA0>;
 		clock-names = "sci_ick";
+		dmas = <&dmac0 0x21>, <&dmac0 0x22>;
+		dma-names = "tx", "rx";
 	};
diff --git a/Documentation/devicetree/bindings/serial/sirf-uart.txt b/Documentation/devicetree/bindings/serial/sirf-uart.txt
index f0c39261c5d4..67e2a0aeb042 100644
--- a/Documentation/devicetree/bindings/serial/sirf-uart.txt
+++ b/Documentation/devicetree/bindings/serial/sirf-uart.txt
@@ -2,8 +2,7 @@
 
 Required properties:
 - compatible : Should be "sirf,prima2-uart", "sirf, prima2-usp-uart",
-		"sirf,atlas7-uart" or "sirf,atlas7-bt-uart" which means
-		uart located in BT module and used for BT.
+		"sirf,atlas7-uart" or "sirf,atlas7-usp-uart".
 - reg : Offset and length of the register set for the device
 - interrupts : Should contain uart interrupt
 - fifosize : Should define hardware rx/tx fifo size
@@ -33,15 +32,3 @@ usp@b0090000 {
 	rts-gpios = <&gpio 15 0>;
 	cts-gpios = <&gpio 46 0>;
 };
-
-for uart use in BT module,
-uart6: uart@11000000 {
-	cell-index = <6>;
-	compatible = "sirf,atlas7-bt-uart", "sirf,atlas7-uart";
-	reg = <0x11000000 0x1000>;
-	interrupts = <0 100 0>;
-	clocks = <&clks 138>, <&clks 140>, <&clks 141>;
-	clock-names = "uart", "general", "noc";
-	fifosize = <128>;
-	status = "disabled";
-}
diff --git a/Documentation/devicetree/bindings/serial/uniphier-uart.txt b/Documentation/devicetree/bindings/serial/uniphier-uart.txt
new file mode 100644
index 000000000000..0b3892a7a528
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/uniphier-uart.txt
@@ -0,0 +1,23 @@
+UniPhier UART controller
+
+Required properties:
+- compatible: should be "socionext,uniphier-uart".
+- reg: offset and length of the register set for the device.
+- interrupts: a single interrupt specifier.
+- clocks: phandle to the input clock.
+
+Optional properties:
+- fifo-size: the RX/TX FIFO size.  Defaults to 64 if not specified.
+
+Example:
+	aliases {
+		serial0 = &serial0;
+	};
+
+	serial0: serial@54006800 {
+		compatible = "socionext,uniphier-uart";
+		reg = <0x54006800 0x40>;
+		interrupts = <0 33 4>;
+		clocks = <&uart_clk>;
+		fifo-size = <64>;
+	};
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 1e18efe3a4ed..8bb54c95cece 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -972,14 +972,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 		uart[8250],io,<addr>[,options]
 		uart[8250],mmio,<addr>[,options]
 		uart[8250],mmio32,<addr>[,options]
+		uart[8250],mmio32be,<addr>[,options]
 		uart[8250],0x<addr>[,options]
 			Start an early, polled-mode console on the 8250/16550
 			UART at the specified I/O port or MMIO address.
 			MMIO inter-register address stride is either 8-bit
-			(mmio) or 32-bit (mmio32).
-			If none of [io|mmio|mmio32], <addr> is assumed to be
-			equivalent to 'mmio'. 'options' are specified in the
-			same format described for "console=ttyS<n>"; if
+			(mmio) or 32-bit (mmio32 or mmio32be).
+			If none of [io|mmio|mmio32|mmio32be], <addr> is assumed
+			to be equivalent to 'mmio'. 'options' are specified
+			in the same format described for "console=ttyS<n>"; if
 			unspecified, the h/w is not initialized.
 
 		pl011,<addr>
diff --git a/Documentation/serial/serial-rs485.txt b/Documentation/serial/serial-rs485.txt
index 39dac95422a3..2253b8b45a74 100644
--- a/Documentation/serial/serial-rs485.txt
+++ b/Documentation/serial/serial-rs485.txt
@@ -33,50 +33,10 @@
    the values given by the device tree.
 
    Any driver for devices capable of working both as RS232 and RS485 should
-   provide at least the following ioctls:
-
-    - TIOCSRS485 (typically associated with number 0x542F). This ioctl is used
-      to enable/disable RS485 mode from user-space
-
-    - TIOCGRS485 (typically associated with number 0x542E). This ioctl is used
-      to get RS485 mode from kernel-space (i.e., driver) to user-space.
-
-   In other words, the serial driver should contain a code similar to the next
-   one:
-
-	static struct uart_ops atmel_pops = {
-		/* ... */
-		.ioctl		= handle_ioctl,
-	};
-
-	static int handle_ioctl(struct uart_port *port,
-		unsigned int cmd,
-		unsigned long arg)
-	{
-		struct serial_rs485 rs485conf;
-
-		switch (cmd) {
-		case TIOCSRS485:
-			if (copy_from_user(&rs485conf,
-				(struct serial_rs485 *) arg,
-				sizeof(rs485conf)))
-					return -EFAULT;
-
-			/* ... */
-			break;
-
-		case TIOCGRS485:
-			if (copy_to_user((struct serial_rs485 *) arg,
-				...,
-				sizeof(rs485conf)))
-					return -EFAULT;
-			/* ... */
-			break;
-
-		/* ... */
-		}
-	}
-
+   implement the rs485_config callback in the uart_port structure. The
+   serial_core calls rs485_config to do the device specific part in response
+   to TIOCSRS485 and TIOCGRS485 ioctls (see below). The rs485_config callback
+   receives a pointer to struct serial_rs485.
 
 4. USAGE FROM USER-LEVEL
 
@@ -85,7 +45,7 @@
 
 	#include <linux/serial.h>
 
-	/* Driver-specific ioctls: */
+	/* RS485 ioctls: */
 	#define TIOCGRS485      0x542E
 	#define TIOCSRS485      0x542F
 
diff --git a/Documentation/serial/tty.txt b/Documentation/serial/tty.txt
index dbe6623fed1c..973c8ad3f959 100644
--- a/Documentation/serial/tty.txt
+++ b/Documentation/serial/tty.txt
@@ -4,9 +4,6 @@
 Your guide to the ancient and twisted locking policies of the tty layer and
 the warped logic behind them. Beware all ye who read on.
 
-FIXME: still need to work out the full set of BKL assumptions and document
-them so they can eventually be killed off.
-
 
 Line Discipline
 ---------------