Merge tag 'tty-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver updates from Greg KH:
 "Here is the big set of tty/serial driver changes for 5.12-rc1.

  Nothing huge, just lots of good cleanups and additions:

   - n_tty line discipline cleanups

   - vt core cleanups and reworks to make the code more "modern"

   - stm32 driver additions

   - tty led support added to the tty core and led layer

   - minor serial driver fixups and additions

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

* tag 'tty-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (54 commits)
  serial: core: Remove BUG_ON(in_interrupt()) check
  vt_ioctl: Remove in_interrupt() check
  dt-bindings: serial: imx: Switch to my personal address
  vt: keyboard, use new API for keyboard_tasklet
  serial: stm32: improve platform_get_irq condition handling in init_port
  serial: ifx6x60: Remove driver for deprecated platform
  tty: fix up iterate_tty_read() EOVERFLOW handling
  tty: fix up hung_up_tty_read() conversion
  tty: fix up hung_up_tty_write() conversion
  tty: teach the n_tty ICANON case about the new "cookie continuations" too
  tty: teach n_tty line discipline about the new "cookie continuations"
  tty: clean up legacy leftovers from n_tty line discipline
  tty: implement read_iter
  tty: convert tty_ldisc_ops 'read()' function to take a kernel pointer
  serial: remove sirf prima/atlas driver
  serial: mxs-auart: Remove <asm/cacheflush.h>
  serial: mxs-auart: Remove serial_mxs_probe_dt()
  serial: fsl_lpuart: Use of_device_get_match_data()
  dt-bindings: serial: renesas,hscif: Add r8a779a0 support
  tty: serial: Drop unused efm32 serial driver
  ...

7 files changed, 17 insertions, 42 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-led-trigger-tty b/Documentation/ABI/testing/sysfs-class-led-trigger-tty
new file mode 100644
index 000000000000..2bf6b24e781b
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-led-trigger-tty
@@ -0,0 +1,6 @@
+What:		/sys/class/leds/<led>/ttyname
+Date:		Dec 2020
+KernelVersion:	5.10
+Contact:	linux-leds@vger.kernel.org
+Description:
+		Specifies the tty device name of the triggering tty
diff --git a/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml b/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml
index 9702c07a6b6c..2b06c6ce4a75 100644
--- a/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml
@@ -7,7 +7,7 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
 title: Freescale i.MX Universal Asynchronous Receiver/Transmitter (UART)
 
 maintainers:
-  - Fabio Estevam <fabio.estevam@nxp.com>
+  - Fabio Estevam <festevam@gmail.com>
 
 allOf:
   - $ref: "serial.yaml"
diff --git a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.yaml b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.yaml
index ce1d89496342..14c7594c88c6 100644
--- a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.yaml
+++ b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.yaml
@@ -7,7 +7,7 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
 title: Freescale MXS Application UART (AUART)
 
 maintainers:
-  - Fabio Estevam <fabio.estevam@nxp.com>
+  - Fabio Estevam <festevam@gmail.com>
 
 allOf:
   - $ref: "serial.yaml"
diff --git a/Documentation/devicetree/bindings/serial/renesas,hscif.yaml b/Documentation/devicetree/bindings/serial/renesas,hscif.yaml
index c139c5edb93e..512a84942f78 100644
--- a/Documentation/devicetree/bindings/serial/renesas,hscif.yaml
+++ b/Documentation/devicetree/bindings/serial/renesas,hscif.yaml
@@ -51,6 +51,7 @@ properties:
               - renesas,hscif-r8a77980     # R-Car V3H
               - renesas,hscif-r8a77990     # R-Car E3
               - renesas,hscif-r8a77995     # R-Car D3
+              - renesas,hscif-r8a779a0     # R-Car V3U
           - const: renesas,rcar-gen3-hscif # R-Car Gen3 and RZ/G2
           - const: renesas,hscif           # generic HSCIF compatible UART
 
diff --git a/Documentation/devicetree/bindings/serial/sirf-uart.txt b/Documentation/devicetree/bindings/serial/sirf-uart.txt
deleted file mode 100644
index 1e48bbbeecc6..000000000000
--- a/Documentation/devicetree/bindings/serial/sirf-uart.txt
+++ /dev/null
@@ -1,34 +0,0 @@
-* CSR SiRFprimaII/atlasVI Universal Synchronous Asynchronous Receiver/Transmitter *
-
-Required properties:
-- compatible : Should be "sirf,prima2-uart", "sirf, prima2-usp-uart",
-		"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
-- clocks : Should contain uart clock number
-
-Optional properties:
-- uart-has-rtscts: we have hardware flow controller pins in hardware
-- rts-gpios: RTS pin for USP-based UART if uart-has-rtscts is true
-- cts-gpios: CTS pin for USP-based UART if uart-has-rtscts is true
-
-Example:
-
-uart0: uart@b0050000 {
-	cell-index = <0>;
-	compatible = "sirf,prima2-uart";
-	reg = <0xb0050000 0x1000>;
-	interrupts = <17>;
-	fifosize = <128>;
-	clocks = <&clks 13>;
-};
-
-On the board-specific dts, we can put rts-gpios and cts-gpios like
-
-usp@b0090000 {
-	compatible = "sirf,prima2-usp-uart";
-	uart-has-rtscts;
-	rts-gpios = <&gpio 15 0>;
-	cts-gpios = <&gpio 46 0>;
-};
diff --git a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
index 06d5f251ec88..8631678283f9 100644
--- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
@@ -50,11 +50,14 @@ properties:
     minItems: 1
     maxItems: 2
 
-  cts-gpios:
-    maxItems: 1
-
-  rts-gpios:
-    maxItems: 1
+# cts-gpios and rts-gpios properties can be used instead of 'uart-has-rtscts'
+# or 'st,hw-flow-ctrl' (deprecated) for making use of any gpio pins for flow
+# control instead of dedicated pins.
+#
+# It should be noted that both cts-gpios/rts-gpios and 'uart-has-rtscts' or
+# 'st,hw-flow-ctrl' (deprecated) properties cannot co-exist in a design.
+  cts-gpios: true
+  rts-gpios: true
 
   wakeup-source: true
 
diff --git a/Documentation/networking/caif/caif.rst b/Documentation/networking/caif/caif.rst
index a07213030ccf..81a14373d780 100644
--- a/Documentation/networking/caif/caif.rst
+++ b/Documentation/networking/caif/caif.rst
@@ -68,7 +68,6 @@ There are debugfs parameters provided for serial communication.
 * tty_status: Prints the bit-mask tty status information
 
   - 0x01 - tty->warned is on.
-  - 0x02 - tty->low_latency is on.
   - 0x04 - tty->packed is on.
   - 0x08 - tty->flow_stopped is on.
   - 0x10 - tty->hw_stopped is on.