Merge tag 'tty-6.6-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 and serial driver changes for 6.6-rc1.

  Lots of cleanups in here this cycle, and some driver updates. Short
  summary is:

   - Jiri's continued work to make the tty code and apis be a bit more
     sane with regards to modern kernel coding style and types

   - cpm_uart driver updates

   - n_gsm updates and fixes

   - meson driver updates

   - sc16is7xx driver updates

   - 8250 driver updates for different hardware types

   - qcom-geni driver fixes

   - tegra serial driver change

   - stm32 driver updates

   - synclink_gt driver cleanups

   - tty structure size reduction

  All of these have been in linux-next this week with no reported
  issues. The last bit of cleanups from Jiri and the tty structure size
  reduction came in last week, a bit late but as they were just style
  changes and size reductions, I figured they should get into this merge
  cycle so that others can work on top of them with no merge conflicts"

* tag 'tty-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (199 commits)
  tty: shrink the size of struct tty_struct by 40 bytes
  tty: n_tty: deduplicate copy code in n_tty_receive_buf_real_raw()
  tty: n_tty: extract ECHO_OP processing to a separate function
  tty: n_tty: unify counts to size_t
  tty: n_tty: use u8 for chars and flags
  tty: n_tty: simplify chars_in_buffer()
  tty: n_tty: remove unsigned char casts from character constants
  tty: n_tty: move newline handling to a separate function
  tty: n_tty: move canon handling to a separate function
  tty: n_tty: use MASK() for masking out size bits
  tty: n_tty: make n_tty_data::num_overrun unsigned
  tty: n_tty: use time_is_before_jiffies() in n_tty_receive_overrun()
  tty: n_tty: use 'num' for writes' counts
  tty: n_tty: use output character directly
  tty: n_tty: make flow of n_tty_receive_buf_common() a bool
  Revert "tty: serial: meson: Add a earlycon for the T7 SoC"
  Documentation: devices.txt: Fix minors for ttyCPM*
  Documentation: devices.txt: Remove ttySIOC*
  Documentation: devices.txt: Remove ttyIOC*
  serial: 8250_bcm7271: improve bcm7271 8250 port
  ...

Author: torvalds

Documentation/admin-guide/devices.txt

@@ -2691,18 +2691,9 @@
 		 45 = /dev/ttyMM1		Marvell MPSC - port 1 (obsolete unused)
 		 46 = /dev/ttyCPM0		PPC CPM (SCC or SMC) - port 0
 		    ...
-		 49 = /dev/ttyCPM5		PPC CPM (SCC or SMC) - port 3
-		 50 = /dev/ttyIOC0		Altix serial card
-		    ...
-		 81 = /dev/ttyIOC31		Altix serial card
+		 51 = /dev/ttyCPM5		PPC CPM (SCC or SMC) - port 5
 		 82 = /dev/ttyVR0		NEC VR4100 series SIU
 		 83 = /dev/ttyVR1		NEC VR4100 series DSIU
-		 84 = /dev/ttyIOC84		Altix ioc4 serial card
-		    ...
-		 115 = /dev/ttyIOC115		Altix ioc4 serial card
-		 116 = /dev/ttySIOC0		Altix ioc3 serial card
-		    ...
-		 147 = /dev/ttySIOC31		Altix ioc3 serial card
 		 148 = /dev/ttyPSC0		PPC PSC - port 0
 		    ...
 		 153 = /dev/ttyPSC5		PPC PSC - port 5
@@ -2761,10 +2752,7 @@
 		 43 = /dev/ttycusmx2		Callout device for ttySMX2
 		 46 = /dev/cucpm0		Callout device for ttyCPM0
 		    ...
-		 49 = /dev/cucpm5		Callout device for ttyCPM5
-		 50 = /dev/cuioc40		Callout device for ttyIOC40
-		    ...
-		 81 = /dev/cuioc431		Callout device for ttyIOC431
+		 51 = /dev/cucpm5		Callout device for ttyCPM5
 		 82 = /dev/cuvr0		Callout device for ttyVR0
 		 83 = /dev/cuvr1		Callout device for ttyVR1
 

Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml

@@ -33,6 +33,7 @@ properties:
               - amlogic,meson8b-uart
               - amlogic,meson-gx-uart
               - amlogic,meson-s4-uart
+              - amlogic,meson-a1-uart
           - const: amlogic,meson-ao-uart
       - description: Always-on power domain UART controller on G12A SoCs
         items:
@@ -46,10 +47,15 @@ properties:
           - amlogic,meson8b-uart
           - amlogic,meson-gx-uart
           - amlogic,meson-s4-uart
+          - amlogic,meson-a1-uart
       - description: Everything-Else power domain UART controller on G12A SoCs
         items:
           - const: amlogic,meson-g12a-uart
           - const: amlogic,meson-gx-uart
+      - description: UART controller on S4 compatible SoCs
+        items:
+          - const: amlogic,t7-uart
+          - const: amlogic,meson-s4-uart
 
   reg:
     maxItems: 1

Documentation/devicetree/bindings/serial/fsl-lpuart.yaml

@@ -25,9 +25,13 @@ properties:
           - fsl,imxrt1050-lpuart
       - items:
           - enum:
-              - fsl,imx93-lpuart
               - fsl,imx8ulp-lpuart
           - const: fsl,imx7ulp-lpuart
+      - items:
+          - enum:
+              - fsl,imx93-lpuart
+          - const: fsl,imx8ulp-lpuart
+          - const: fsl,imx7ulp-lpuart
       - items:
           - enum:
               - fsl,imx8qm-lpuart

Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt

@@ -23,6 +23,9 @@ Optional properties:
     1 = active low.
 - irda-mode-ports: An array that lists the indices of the port that
 		   should operate in IrDA mode.
+- nxp,modem-control-line-ports: An array that lists the indices of the port that
+				should have shared GPIO lines configured as
+				modem control lines.
 
 Example:
         sc16is750: sc16is750@51 {
@@ -35,6 +38,26 @@ Example:
                 #gpio-cells = <2>;
         };
 
+	sc16is752: sc16is752@53 {
+		compatible = "nxp,sc16is752";
+		reg = <0x53>;
+		clocks = <&clk20m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+		nxp,modem-control-line-ports = <1>; /* Port 1 as modem control lines */
+		gpio-controller; /* Port 0 as GPIOs */
+		#gpio-cells = <2>;
+	};
+
+	sc16is752: sc16is752@54 {
+		compatible = "nxp,sc16is752";
+		reg = <0x54>;
+		clocks = <&clk20m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+		nxp,modem-control-line-ports = <0 1>; /* Ports 0 and 1 as modem control lines */
+	};
+
 * spi as bus
 
 Required properties:
@@ -59,6 +82,9 @@ Optional properties:
     1 = active low.
 - irda-mode-ports: An array that lists the indices of the port that
 		   should operate in IrDA mode.
+- nxp,modem-control-line-ports: An array that lists the indices of the port that
+				should have shared GPIO lines configured as
+				modem control lines.
 
 Example:
 	sc16is750: sc16is750@0 {
@@ -70,3 +96,23 @@ Example:
 		gpio-controller;
 		#gpio-cells = <2>;
 	};
+
+	sc16is752: sc16is752@1 {
+		compatible = "nxp,sc16is752";
+		reg = <1>;
+		clocks = <&clk20m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+		nxp,modem-control-line-ports = <1>; /* Port 1 as modem control lines */
+		gpio-controller; /* Port 0 as GPIOs */
+		#gpio-cells = <2>;
+	};
+
+	sc16is752: sc16is752@2 {
+		compatible = "nxp,sc16is752";
+		reg = <2>;
+		clocks = <&clk20m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+		nxp,modem-control-line-ports = <0 1>; /* Ports 0 and 1 as modem control lines */
+	};

Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml

@@ -117,7 +117,6 @@ properties:
 required:
   - compatible
   - reg
-  - interrupts
 
 unevaluatedProperties: false
 

Documentation/driver-api/tty/tty_buffer.rst

@@ -15,10 +15,13 @@ Flip Buffer Management
 ======================
 
 .. kernel-doc:: drivers/tty/tty_buffer.c
-   :identifiers: tty_prepare_flip_string tty_insert_flip_string_fixed_flag
-           tty_insert_flip_string_flags __tty_insert_flip_char
+   :identifiers: tty_prepare_flip_string
            tty_flip_buffer_push tty_ldisc_receive_buf
 
+.. kernel-doc:: include/linux/tty_flip.h
+   :identifiers: tty_insert_flip_string_fixed_flag tty_insert_flip_string_flags
+           tty_insert_flip_char
+
 ----
 
 Other Functions

arch/alpha/kernel/setup.c

@@ -421,7 +421,7 @@ register_cpus(void)
 arch_initcall(register_cpus);
 
 #ifdef CONFIG_MAGIC_SYSRQ
-static void sysrq_reboot_handler(int unused)
+static void sysrq_reboot_handler(u8 unused)
 {
 	machine_halt();
 }

arch/alpha/kernel/srmcons.c

@@ -129,9 +129,8 @@ srmcons_do_write(struct tty_port *port, const char *buf, int count)
 	return count;
 }
 
-static int
-srmcons_write(struct tty_struct *tty,
-	      const unsigned char *buf, int count)
+static ssize_t
+srmcons_write(struct tty_struct *tty, const u8 *buf, size_t count)
 {
 	unsigned long flags;
 

arch/arm64/boot/dts/amlogic/meson-a1.dtsi

@@ -108,7 +108,7 @@
 			};
 
 			uart_AO: serial@1c00 {
-				compatible = "amlogic,meson-gx-uart",
+				compatible = "amlogic,meson-a1-uart",
 					     "amlogic,meson-ao-uart";
 				reg = <0x0 0x1c00 0x0 0x18>;
 				interrupts = <GIC_SPI 25 IRQ_TYPE_EDGE_RISING>;
@@ -118,7 +118,7 @@
 			};
 
 			uart_AO_B: serial@2000 {
-				compatible = "amlogic,meson-gx-uart",
+				compatible = "amlogic,meson-a1-uart",
 					     "amlogic,meson-ao-uart";
 				reg = <0x0 0x2000 0x0 0x18>;
 				interrupts = <GIC_SPI 26 IRQ_TYPE_EDGE_RISING>;

arch/loongarch/kernel/sysrq.c

@@ -43,7 +43,7 @@ static void sysrq_tlbdump_othercpus(struct work_struct *dummy)
 static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus);
 #endif
 
-static void sysrq_handle_tlbdump(int key)
+static void sysrq_handle_tlbdump(u8 key)
 {
 	sysrq_tlbdump_single(NULL);
 #ifdef CONFIG_SMP