Merge tag 'tty-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty / serial driver update from Greg KH:
 "Here's the big tty / serial driver update for 3.17-rc1.

  Nothing major, just a number of fixes and new features for different
  serial drivers, and some more tty core fixes and documentation of the
  tty locks.

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

* tag 'tty-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (82 commits)
  tty/n_gsm.c: fix a memory leak in gsmld_open
  pch_uart: don't hardcode PCI slot to get DMA device
  tty: n_gsm, use setup_timer
  Revert "ARC: [arcfpga] stdout-path now suffices for earlycon/console"
  serial: sc16is7xx: Correct initialization of s->clk
  serial: 8250_dw: Add support for deferred probing
  serial: 8250_dw: Add optional reset control support
  serial: st-asc: Fix overflow in baudrate calculation
  serial: st-asc: Don't call BUG in asc_console_setup()
  tty: serial: msm: Make of_device_id array const
  tty/n_gsm.c: get gsm->num after gsm_activate_mux
  serial/core: Fix too big allocation for attribute member
  drivers/tty/serial: use correct type for dma_map/unmap
  serial: altera_jtaguart: Fix putchar function passed to uart_console_write()
  serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers
  Serial: allow port drivers to have a default attribute group
  tty: kgdb_nmi: Automatically manage tty enable
  serial: altera_jtaguart: Adpot uart_console_write()
  serial: samsung: improve code clarity by defining a variable
  serial: samsung: correct the case and default order in switch
  ...

93 files changed, 1583 insertions, 1048 deletions

diff --git a/Documentation/ABI/testing/sysfs-tty b/Documentation/ABI/testing/sysfs-tty
index ad22fb0ee765..9eb3c2b6b040 100644
--- a/Documentation/ABI/testing/sysfs-tty
+++ b/Documentation/ABI/testing/sysfs-tty
@@ -138,3 +138,19 @@ Description:
 
 		 These sysfs values expose the TIOCGSERIAL interface via
 		 sysfs rather than via ioctls.
+
+What:		/sys/class/tty/ttyS0/rx_trig_bytes
+Date:		May 2014
+Contact:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
+Description:
+		 Shows current RX interrupt trigger bytes or sets the
+		 user specified value to change it for the FIFO buffer.
+		 Users can show or set this value regardless of opening the
+		 serial device file or not.
+
+		 The RX trigger can be set one of four kinds of values for UART
+		 serials. When users input a meaning less value to this I/F,
+		 the RX trigger is changed to the nearest lower value for the
+		 device specification. For example, when user sets 7bytes on
+		 16550A, which has 1/4/8/14 bytes trigger, the RX trigger is
+		 automatically changed to 4 bytes.
diff --git a/Documentation/devicetree/bindings/serial/efm32-uart.txt b/Documentation/devicetree/bindings/serial/efm32-uart.txt
index 3ca01336b837..8adbab268ca3 100644
--- a/Documentation/devicetree/bindings/serial/efm32-uart.txt
+++ b/Documentation/devicetree/bindings/serial/efm32-uart.txt
@@ -6,7 +6,7 @@ Required properties:
 - interrupts : Should contain uart interrupt
 
 Optional properties:
-- efm32,location : Decides the location of the USART I/O pins.
+- energymicro,location : Decides the location of the USART I/O pins.
   Allowed range : [0 .. 5]
   Default: 0
 
@@ -16,5 +16,5 @@ uart@0x4000c400 {
 	compatible = "energymicro,efm32-uart";
 	reg = <0x4000c400 0x400>;
 	interrupts = <15>;
-	efm32,location = <0>;
+	energymicro,location = <0>;
 };
diff --git a/Documentation/devicetree/bindings/serial/fsl-lpuart.txt b/Documentation/devicetree/bindings/serial/fsl-lpuart.txt
index a1d1205d8185..c95005efbcb8 100644
--- a/Documentation/devicetree/bindings/serial/fsl-lpuart.txt
+++ b/Documentation/devicetree/bindings/serial/fsl-lpuart.txt
@@ -1,7 +1,11 @@
 * Freescale low power universal asynchronous receiver/transmitter (lpuart)
 
 Required properties:
-- compatible : Should be "fsl,<soc>-lpuart"
+- compatible :
+  - "fsl,vf610-lpuart" for lpuart compatible with the one integrated
+    on Vybrid vf610 SoC with 8-bit register organization
+  - "fsl,ls1021a-lpuart" for lpuart compatible with the one integrated
+    on LS1021A SoC with 32-bit big-endian register organization
 - reg : Address and length of the register set for the device
 - interrupts : Should contain uart interrupt
 - clocks : phandle + clock specifier pairs, one for each entry in clock-names
diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.txt b/Documentation/devicetree/bindings/serial/samsung_uart.txt
index 2c8a17cf5cb5..e85f37ec33f0 100644
--- a/Documentation/devicetree/bindings/serial/samsung_uart.txt
+++ b/Documentation/devicetree/bindings/serial/samsung_uart.txt
@@ -1,14 +1,58 @@
 * Samsung's UART Controller
 
-The Samsung's UART controller is used for interfacing SoC with serial communicaion
-devices.
+The Samsung's UART controller is used for interfacing SoC with serial
+communicaion devices.
 
 Required properties:
-- compatible: should be
-  - "samsung,exynos4210-uart", for UART's compatible with Exynos4210 uart ports.
+- compatible: should be one of following:
+  - "samsung,exynos4210-uart" -  Exynos4210 SoC,
+  - "samsung,s3c2410-uart" - compatible with ports present on S3C2410 SoC,
+  - "samsung,s3c2412-uart" - compatible with ports present on S3C2412 SoC,
+  - "samsung,s3c2440-uart" - compatible with ports present on S3C2440 SoC,
+  - "samsung,s3c6400-uart" - compatible with ports present on S3C6400 SoC,
+  - "samsung,s5pv210-uart" - compatible with ports present on S5PV210 SoC.
 
 - reg: base physical address of the controller and length of memory mapped
   region.
 
-- interrupts: interrupt number to the cpu. The interrupt specifier format depends
-  on the interrupt controller parent.
+- interrupts: a single interrupt signal to SoC interrupt controller,
+  according to interrupt bindings documentation [1].
+
+- clock-names: input names of clocks used by the controller:
+  - "uart" - controller bus clock,
+  - "clk_uart_baudN" - Nth baud base clock input (N = 0, 1, ...),
+    according to SoC User's Manual (only N = 0 is allowedfor SoCs without
+    internal baud clock mux).
+- clocks: phandles and specifiers for all clocks specified in "clock-names"
+  property, in the same order, according to clock bindings documentation [2].
+
+[1] Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+[2] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Optional properties:
+- samsung,uart-fifosize: The fifo size supported by the UART channel
+
+Note: Each Samsung UART should have an alias correctly numbered in the
+"aliases" node, according to serialN format, where N is the port number
+(non-negative decimal integer) as specified by User's Manual of respective
+SoC.
+
+Example:
+	aliases {
+		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+	};
+
+Example:
+	uart1: serial@7f005400 {
+		compatible = "samsung,s3c6400-uart";
+		reg = <0x7f005400 0x100>;
+		interrupt-parent = <&vic1>;
+		interrupts = <6>;
+		clock-names = "uart", "clk_uart_baud2",
+				"clk_uart_baud3";
+		clocks = <&clocks PCLK_UART1>, <&clocks PCLK_UART1>,
+				<&clocks SCLK_UART>;
+		samsung,uart-fifosize = <16>;
+	};
diff --git a/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.txt b/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.txt
index f13f1c5be91c..7f76214f728a 100644
--- a/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.txt
+++ b/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.txt
@@ -4,9 +4,18 @@ Required properties:
 - compatible : "snps,dw-apb-uart"
 - reg : offset and length of the register set for the device.
 - interrupts : should contain uart interrupt.
+
+Clock handling:
+The clock rate of the input clock needs to be supplied by one of
 - clock-frequency : the input clock frequency for the UART.
+- clocks : phandle to the input clock
+
+The supplying peripheral clock can also be handled, needing a second property
+- clock-names: tuple listing input clock names.
+	Required elements: "baudclk", "apb_pclk"
 
 Optional properties:
+- resets : phandle to the parent reset controller.
 - reg-shift : quantity to shift the register offsets by.  If this property is
   not present then the register offsets are not shifted.
 - reg-io-width : the size (in bytes) of the IO accesses that should be
@@ -23,3 +32,26 @@ Example:
 		reg-shift = <2>;
 		reg-io-width = <4>;
 	};
+
+Example with one clock:
+
+	uart@80230000 {
+		compatible = "snps,dw-apb-uart";
+		reg = <0x80230000 0x100>;
+		clocks = <&baudclk>;
+		interrupts = <10>;
+		reg-shift = <2>;
+		reg-io-width = <4>;
+	};
+
+Example with two clocks:
+
+	uart@80230000 {
+		compatible = "snps,dw-apb-uart";
+		reg = <0x80230000 0x100>;
+		clocks = <&baudclk>, <&apb_pclk>;
+		clock-names = "baudclk", "apb_pclk";
+		interrupts = <10>;
+		reg-shift = <2>;
+		reg-io-width = <4>;
+	};
diff --git a/arch/arc/boot/dts/angel4.dts b/arch/arc/boot/dts/angel4.dts
index 5bb2fdaca02f..6b57475967a6 100644
--- a/arch/arc/boot/dts/angel4.dts
+++ b/arch/arc/boot/dts/angel4.dts
@@ -17,7 +17,7 @@
 	interrupt-parent = <&intc>;
 
 	chosen {
-		bootargs = "console=ttyARC0,115200n8 earlyprintk=ttyARC0";
+		bootargs = "earlycon=arc_uart,mmio32,0xc0fc1000,115200n8 console=ttyARC0,115200n8";
 	};
 
 	aliases {
diff --git a/arch/arc/plat-arcfpga/Kconfig b/arch/arc/plat-arcfpga/Kconfig
index e27bb5cc3c1e..b9f34cf55acf 100644
--- a/arch/arc/plat-arcfpga/Kconfig
+++ b/arch/arc/plat-arcfpga/Kconfig
@@ -41,11 +41,4 @@ config ISS_SMP_EXTN
 	  -XTL (To enable CPU start/stop/set-PC for another CPU)
 	  It doesn't provide coherent Caches and/or Atomic Ops (LLOCK/SCOND)
 
-config ARC_SERIAL_BAUD
-	int "UART Baud rate"
-	default "115200"
-	depends on SERIAL_ARC || SERIAL_ARC_CONSOLE
-	help
-	  Baud rate for the ARC UART
-
 endif
diff --git a/arch/arc/plat-arcfpga/platform.c b/arch/arc/plat-arcfpga/platform.c
index 61c7e5997387..b8d0d456627f 100644
--- a/arch/arc/plat-arcfpga/platform.c
+++ b/arch/arc/plat-arcfpga/platform.c
@@ -22,115 +22,22 @@
 #include <plat/smp.h>
 #include <plat/irq.h>
 
-/*----------------------- Platform Devices -----------------------------*/
-
-#if IS_ENABLED(CONFIG_SERIAL_ARC)
-static unsigned long arc_uart_info[] = {
-	0,	/* uart->is_emulated (runtime @running_on_hw) */
-	0,	/* uart->port.uartclk */
-	0,	/* uart->baud */
-	0
-};
-
-#if defined(CONFIG_SERIAL_ARC_CONSOLE)
-/*
- * static platform data - but only for early serial
- * TBD: derive this from a special DT node
- */
-static struct resource arc_uart0_res[] = {
-	{
-		.start = UART0_BASE,
-		.end   = UART0_BASE + 0xFF,
-		.flags = IORESOURCE_MEM,
-	},
-	{
-		.start = UART0_IRQ,
-		.end   = UART0_IRQ,
-		.flags = IORESOURCE_IRQ,
-	},
-};
-
-static struct platform_device arc_uart0_dev = {
-	.name = "arc-uart",
-	.id = 0,
-	.num_resources = ARRAY_SIZE(arc_uart0_res),
-	.resource = arc_uart0_res,
-	.dev = {
-		.platform_data = &arc_uart_info,
-	},
-};
-
-static struct platform_device *fpga_early_devs[] __initdata = {
-	&arc_uart0_dev,
-};
-#endif	/* CONFIG_SERIAL_ARC_CONSOLE */
-
-static void arc_fpga_serial_init(void)
-{
-	/* To let driver workaround ISS bug: baudh Reg can't be set to 0 */
-	arc_uart_info[0] = !running_on_hw;
-
-	arc_uart_info[1] = arc_get_core_freq();
-
-	arc_uart_info[2] = CONFIG_ARC_SERIAL_BAUD;
-
-#if defined(CONFIG_SERIAL_ARC_CONSOLE)
-	early_platform_add_devices(fpga_early_devs,
-				   ARRAY_SIZE(fpga_early_devs));
-
-	/*
-	 * ARC console driver registers (build time) as an early platform driver
-	 * of class "earlyprintk". However it needs explicit cmdline toggle
-	 * "earlyprintk=ttyARC0" to be successfuly runtime registered.
-	 * Otherwise the early probe below fails to find the driver
-	 */
-	early_platform_driver_probe("earlyprintk", 1, 0);
-
-	/*
-	 * This is to make sure that arc uart would be preferred console
-	 * despite one/more of following:
-	 *   -command line lacked "console=ttyARC0" or
-	 *   -CONFIG_VT_CONSOLE was enabled (for no reason whatsoever)
-	 * Note that this needs to be done after above early console is reg,
-	 * otherwise the early console never gets a chance to run.
-	 */
-	add_preferred_console("ttyARC", 0, "115200");
-#endif	/* CONFIG_SERIAL_ARC_CONSOLE */
-}
-#else	/* !IS_ENABLED(CONFIG_SERIAL_ARC) */
-static void arc_fpga_serial_init(void)
-{
-}
-#endif
-
 static void __init plat_fpga_early_init(void)
 {
 	pr_info("[plat-arcfpga]: registering early dev resources\n");
 
-	arc_fpga_serial_init();
-
 #ifdef CONFIG_ISS_SMP_EXTN
 	iss_model_init_early_smp();
 #end