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/Linux-v6.1/Documentation/devicetree/bindings/serial/
Drs485.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/serial/rs485.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: RS485 serial communications Bindings
9 description: The RTS signal is capable of automatically controlling line
10 direction for the built-in half-duplex mode. The properties described
11 hereafter shall be given to a half-duplex capable UART node.
14 - Rob Herring <robh@kernel.org>
17 rs485-rts-delay:
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Dst,stm32-uart.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/serial/st,stm32-uart.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 - Erwan Le Ray <erwan.leray@foss.st.com>
15 - st,stm32-uart
16 - st,stm32f7-uart
17 - st,stm32h7-uart
34 st,hw-flow-ctrl:
38 uart-has-rtscts: true
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D8250_omap.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Vignesh Raghavendra <vigneshr@ti.com>
13 - $ref: /schemas/serial/serial.yaml#
14 - $ref: /schemas/serial/rs485.yaml#
19 - enum:
20 - ti,am3352-uart
21 - ti,am4372-uart
22 - ti,am654-uart
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Dfsl-imx-uart.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/serial/fsl-imx-uart.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Fabio Estevam <festevam@gmail.com>
13 - $ref: "serial.yaml"
14 - $ref: "rs485.yaml"
19 - const: fsl,imx1-uart
20 - const: fsl,imx21-uart
21 - items:
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/Linux-v6.1/Documentation/driver-api/serial/
Dserial-rs485.rst2 RS485 Serial Communications
8 EIA-485, also known as TIA/EIA-485 or RS-485, is a standard defining the
15 2. Hardware-related Considerations
18 Some CPUs/UARTs (e.g., Atmel AT91 or 16C950 UART) contain a built-in
19 half-duplex mode capable of automatically controlling line direction by
20 toggling RTS or DTR signals. That can be used to control external
21 half-duplex hardware like an RS485 transceiver or any RS232-connected
22 half-duplex devices like some modems.
26 available at user-level to allow switching from one mode to the other, and
33 RS485 communications. This data structure is used to set and configure RS485
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/Linux-v6.1/arch/arm/boot/dts/
Daks-cdu.dts1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * aks-cdu.dts - Device Tree file for AK signal CDU
9 /dts-v1/;
11 #include "ge863-pro3.dtsi"
20 clock-frequency = <32768>;
32 linux,rs485-enabled-at-boot-time;
33 rs485-rts-delay = <0 0>;
38 linux,rs485-enabled-at-boot-time;
39 rs485-rts-delay = <0 0>;
44 linux,rs485-enabled-at-boot-time;
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Dam335x-nano.dts1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2013 Newflow Ltd - http://www.newflow.co.uk/
5 /dts-v1/;
15 cpu0-supply = <&dcdc2_reg>;
25 compatible = "gpio-leds";
30 default-state = "off";
36 pinctrl-names = "default";
37 pinctrl-0 = <&misc_pins>;
40 pinctrl-single,pins = <
46 pinctrl-single,pins = <
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Dam335x-pdu001.dts6 * Copyright (C) 2018 EETS GmbH - http://www.eets.ch/
8 * Copyright (C) 2011, Texas Instruments, Incorporated - https://www.ti.com/
10 * SPDX-License-Identifier: GPL-2.0+
13 /dts-v1/;
16 #include <dt-bindings/interrupt-controller/irq.h>
17 #include <dt-bindings/leds/leds-pca9532.h>
24 stdout-path = &uart3;
29 cpu0-supply = <&vdd1_reg>;
39 compatible = "regulator-fixed";
40 regulator-name = "vbat";
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Dimx7-mba7.dtsi1 // SPDX-License-Identifier: GPL-2.0 OR X11
3 * Device Tree Include file for TQ-Systems MBa7 carrier board.
5 * Copyright (C) 2016 TQ-Systems GmbH
6 * Author: Markus Niebel <Markus.Niebel@tq-group.com>
13 #include <dt-bindings/input/input.h>
14 #include <dt-bindings/net/ti-dp83867.h>
20 /delete-property/ mmc2;
24 compatible = "gpio-beeper";
29 stdout-path = &uart6;
32 gpio_buttons: gpio-keys {
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Dmba6ulx.dtsi1 // SPDX-License-Identifier: (GPL-2.0-or-later OR MIT)
3 * Copyright 2018-2022 TQ-Systems GmbH
4 * Author: Markus Niebel <Markus.Niebel@tq-group.com>
8 model = "TQ-Systems MBA6ULx Baseboard";
18 stdout-path = &uart1;
22 compatible = "pwm-backlight";
23 power-supply = <&reg_mba6ul_3v3>;
24 enable-gpios = <&expander_out0 4 GPIO_ACTIVE_HIGH>;
29 compatible = "gpio-beeper";
33 gpio_buttons: gpio-keys {
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Dimx6dl-plybas.dts1 // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
7 /dts-v1/;
8 #include <dt-bindings/gpio/gpio.h>
9 #include <dt-bindings/leds/common.h>
17 stdout-path = &uart4;
21 compatible = "gpio-keys";
24 button-start {
30 button-clean {
38 compatible = "gpio-leds";
39 pinctrl-names = "default";
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/Linux-v6.1/arch/arm64/boot/dts/freescale/
Dimx8mp-verdin-dev.dtsi1 // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
6 #include "imx8mp-verdin-dahlia.dtsi"
11 reg_eth2phy: regulator-eth2phy {
12 compatible = "regulator-fixed";
13 enable-active-high;
15 off-on-delay = <500000>;
16 regulator-max-microvolt = <3300000>;
17 regulator-min-microvolt = <3300000>;
18 regulator-name = "+V3.3_ETH";
19 startup-delay-us = <200000>;
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Dimx8mm-venice-gw7902.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
6 /dts-v1/;
8 #include <dt-bindings/gpio/gpio.h>
9 #include <dt-bindings/input/linux-event-codes.h>
10 #include <dt-bindings/leds/common.h>
11 #include <dt-bindings/net/ti-dp83867.h>
12 #include <dt-bindings/phy/phy-imx8-pcie.h>
18 compatible = "gw,imx8mm-gw7902", "fsl,imx8mm";
27 stdout-path = &uart2;
36 compatible = "fixed-clock";
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Dimx8mm-venice-gw7901.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
6 /dts-v1/;
8 #include <dt-bindings/gpio/gpio.h>
9 #include <dt-bindings/input/linux-event-codes.h>
10 #include <dt-bindings/leds/common.h>
11 #include <dt-bindings/phy/phy-imx8-pcie.h>
17 compatible = "gw,imx8mm-gw7901", "fsl,imx8mm";
30 stdout-path = &uart2;
38 gpio-keys {
39 compatible = "gpio-keys";
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/Linux-v6.1/include/uapi/linux/
Dserial.h1 /* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
63 #define PORT_RSA 13 /* RSA-DV II/S card */
82 * Multiport serial configuration structure --- external structure
99 * Serial input interrupt line counters -- external structure
111 * Serial interface for controlling RS485 settings on chips with suitable
118 __u32 flags; /* RS485 feature flags */
121 RTS pin when
124 RTS pin after sent*/
130 /* RS-485 addressing mode */
135 __u32 delay_rts_before_send; /* Delay before send (milliseconds) */
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/Linux-v6.1/drivers/tty/serial/8250/
D8250_lpc18xx.c1 // SPDX-License-Identifier: GPL-2.0
36 struct serial_rs485 *rs485) in lpc18xx_rs485_config() argument
43 if (rs485->flags & SER_RS485_ENABLED) { in lpc18xx_rs485_config()
47 if (rs485->flags & SER_RS485_RTS_ON_SEND) in lpc18xx_rs485_config()
51 if (rs485->delay_rts_after_send) { in lpc18xx_rs485_config()
52 baud_clk = port->uartclk / up->dl_read(up); in lpc18xx_rs485_config()
53 rs485_dly_reg = DIV_ROUND_UP(rs485->delay_rts_after_send in lpc18xx_rs485_config()
59 /* Calculate the resulting delay in ms */ in lpc18xx_rs485_config()
60 rs485->delay_rts_after_send = (rs485_dly_reg * MSEC_PER_SEC) in lpc18xx_rs485_config()
80 offset = offset << p->regshift; in lpc18xx_uart_serial_out()
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D8250_port.c1 // SPDX-License-Identifier: GPL-2.0+
3 * Base port operations for 8250/16550-type serial ports
21 #include <linux/delay.h>
254 * tx_loadsz is set to 63-bytes instead of 64-bytes to implement
255 * workaround of errata A-008006 which states that tx_loadsz should
267 .name = "Palmchip BK-3103",
337 #define UART_REG_UNMAPPED -1
369 return __raw_readl(p->membase + (offset << p->regshift)); in au_serial_in()
379 __raw_writel(value, p->membase + (offset << p->regshift)); in au_serial_out()
385 return __raw_readl(up->port.membase + 0x28); in au_serial_dl_read()
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/Linux-v6.1/drivers/tty/serial/
Dserial_core.c1 // SPDX-License-Identifier: GPL-2.0+
8 * Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
25 #include <linux/delay.h>
39 * lockdep: port->lock is initialized in two places, but we
40 * want only one lock-class:
44 #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
47 * Max time with active RTS before/after data is sent.
61 return !!(uport->status & UPSTAT_DCD_ENABLE); in uart_dcd_enabled()
66 if (atomic_add_unless(&state->refcount, 1, 0)) in uart_port_ref()
67 return state->uart_port; in uart_port_ref()
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Dimx.c1 // SPDX-License-Identifier: GPL-2.0+
22 #include <linux/delay.h>
30 #include <linux/dma-mapping.h>
33 #include <linux/dma/imx-dma.h>
74 #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
82 #define UCR2_IRTS (1<<14) /* Ignore RTS pin */
124 #define UFCR_RFDIV_REG(x) (((x) < 7 ? 6 - (x) : 6) << 7)
127 #define USR1_RTSS (1<<14) /* RTS pin status */
129 #define USR1_RTSD (1<<12) /* RTS delta */
147 #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */
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Domap-serial.c1 // SPDX-License-Identifier: GPL-2.0+
3 * Driver for OMAP-UART controller.
16 * this driver as required for the omap-platform.
24 #include <linux/delay.h>
38 #include <linux/platform_data/serial-omap.h>
79 #define OMAP_UART_DMA_CH_FREE -1
176 offset <<= up->port.regshift; in serial_in()
177 return readw(up->port.membase + offset); in serial_in()
182 offset <<= up->port.regshift; in serial_out()
183 writew(value, up->port.membase + offset); in serial_out()
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Dmax310x.c1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (C) 2012-2016 Alexander Shiyan <shc_work@mail.ru>
14 #include <linux/delay.h>
104 #define MAX310X_SPCHR_MULTIDROP_BIT (1 << 5) /* 9-bit multidrop addr char */
117 #define MAX310X_MODE1_TXHIZ_BIT (1 << 2) /* TX pin three-state */
118 #define MAX310X_MODE1_RTSHIZ_BIT (1 << 3) /* RTS pin three-state */
131 #define MAX310X_MODE2_MULTIDROP_BIT (1 << 6) /* 9-bit multidrop enable */
139 * 00 -> 5 bit words
140 * 01 -> 6 bit words
141 * 10 -> 7 bit words
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Dsc16is7xx.c1 // SPDX-License-Identifier: GPL-2.0+
3 * SC16IS7xx tty serial driver - Copyright (C) 2014 GridPoint
13 #include <linux/delay.h>
46 * - only on 75x/76x
49 * - only on 75x/76x
52 * - only on 75x/76x
55 * - only on 75x/76x
83 /* IER register bits - write only if (EFR[4] == 1) */
96 /* FCR register bits - write only if (EFR[4] == 1) */
106 #define SC16IS7XX_IIR_RTOI_SRC 0x0c /* RX time-out interrupt */
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Datmel_serial.c1 // SPDX-License-Identifier: GPL-2.0+
18 #include <linux/clk-provider.h>
25 #include <linux/dma-mapping.h>
47 * These two offsets are substracted from the RX FIFO size to define the RTS
63 /* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we
72 /* Use device name ttyS, major 4, minor 64-68. This is the usual serial port
166 bool hd_start_rx; /* can start RX during half-duplex operation */
196 { .compatible = "atmel,at91rm9200-usart-serial" },
209 return __raw_readl(port->membase + reg); in atmel_uart_readl()
214 __raw_writel(value, port->membase + reg); in atmel_uart_writel()
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Damba-pl011.c1 // SPDX-License-Identifier: GPL-2.0+
9 * Copyright (C) 2010 ST-Ericsson SA
11 * This is a generic driver for ARM AMBA-type serial ports. They
12 * have a lot of 16550-like features, but are not register compatible.
14 * not have an RI input, nor do they have DTR or RTS outputs. If
34 #include <linux/dma-mapping.h>
36 #include <linux/delay.h>
82 /* The size of the array - must be last */
260 unsigned int fifosize; /* vendor-specific */
261 unsigned int fixed_baud; /* vendor-set fixed baud rate */
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/Linux-v6.1/arch/x86/platform/ts5500/
Dts5500.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Technologic Systems TS-5500 Single Board Computer support
5 * Copyright (C) 2013-2014 Savoir-faire Linux Inc.
8 * This driver registers the Technologic Systems TS-5500 Single Board Computer
11 * Documentation/ABI/testing/sysfs-platform-ts5500.
13 * This code may be extended to support similar x86-based platforms.
14 * Actually, the TS-5500 and TS-5400 are supported.
17 #include <linux/delay.h>
28 #define TS5500_PRODUCT_CODE 0x60 /* TS-5500 product code */
29 #define TS5400_PRODUCT_CODE 0x40 /* TS-5400 product code */
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