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/linux/Documentation/devicetree/bindings/serial/
H A Drs485.yaml4 $id: http://devicetree.org/schemas/serial/rs485.yaml#
7 title: RS485 serial communications
17 rs485-rts-delay:
31 rs485-rts-active-high:
35 rs485-rts-active-low:
39 rs485-rx-active-high:
44 linux,rs485-enabled-at-boot-time:
45 description: enables the rs485 feature at boot time. It can be disabled
49 rs485-rx-during-tx:
53 rs485-term-gpios:
[all …]
/linux/drivers/tty/serial/8250/
H A D8250_dwlib.c17 #define DW_UART_TCR 0xac /* Transceiver Control Register (RS485) */
138 static void dw8250_rs485_set_addr(struct uart_port *p, struct serial_rs485 *rs485, in dw8250_rs485_set_addr() argument
143 if (rs485->flags & SER_RS485_ADDRB) { in dw8250_rs485_set_addr()
148 if (rs485->flags & SER_RS485_ADDR_RECV) { in dw8250_rs485_set_addr()
149 u32 delta = p->rs485.flags ^ rs485->flags; in dw8250_rs485_set_addr()
152 * rs485 (param) is equal to uart_port's rs485 only during init in dw8250_rs485_set_addr()
155 if (unlikely(&p->rs485 == rs485)) in dw8250_rs485_set_addr()
156 delta = rs485->flags; in dw8250_rs485_set_addr()
159 (p->rs485.addr_recv != rs485->addr_recv)) in dw8250_rs485_set_addr()
160 dw8250_update_rar(p, rs485->addr_recv); in dw8250_rs485_set_addr()
[all …]
H A D8250_exar.c212 CTI_PORT_TYPE_RS422_485, // RS422/RS485 ONLY
232 struct serial_rs485 *rs485);
398 struct serial_rs485 *rs485) in generic_rs485_config() argument
400 bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED); in generic_rs485_config()
590 * cti_tristate_disable() - Disable RS485 transciever tristate
594 * Most RS485 capable cards have a power on tristate jumper/switch that ensures
595 * the RS422/RS485 transceiver does not drive a multi-drop RS485 bus when it is
596 * not the master. When this jumper is installed the user must set the RS485
683 // 1x RS232, 1x RS422/RS485 in cti_get_port_type_xr17c15x_xr17v25x()
686 // 2x RS232, 2x RS422/RS485 in cti_get_port_type_xr17c15x_xr17v25x()
[all …]
H A D8250_lpc18xx.c36 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()
53 rs485_dly_reg = DIV_ROUND_UP(rs485->delay_rts_after_send in lpc18xx_rs485_config()
60 rs485->delay_rts_after_send = (rs485_dly_reg * MSEC_PER_SEC) in lpc18xx_rs485_config()
/linux/Documentation/driver-api/serial/
H A Dserial-rs485.rst2 RS485 Serial Communications
21 half-duplex hardware like an RS485 transceiver or any RS232-connected
32 The Linux kernel provides the struct serial_rs485 to handle RS485
33 communications. This data structure is used to set and configure RS485
36 The device tree can also provide RS485 boot time parameters
41 Any driver for devices capable of working both as RS232 and RS485 should
48 what RS485 features the driver supports for the ``struct uart_port``.
58 From user-level, RS485 configuration can be get/set using the previous
59 ioctls. For instance, to set RS485 you can use the following code::
63 /* Include definition for RS485 ioctls: TIOCGRS485 and TIOCSRS485 */
[all …]
/linux/drivers/tty/serial/
H A Dserial_core.c185 if (old != port->mctrl && !(port->rs485.flags & SER_RS485_ENABLED)) in uart_update_mctrl()
1295 static int uart_check_rs485_flags(struct uart_port *port, struct serial_rs485 *rs485) in uart_check_rs485_flags() argument
1297 u32 flags = rs485->flags; in uart_check_rs485_flags()
1310 if (!(rs485->flags & SER_RS485_ADDRB) && in uart_check_rs485_flags()
1311 (rs485->flags & (SER_RS485_ADDR_RECV|SER_RS485_ADDR_DEST))) in uart_check_rs485_flags()
1315 if (!(rs485->flags & SER_RS485_ADDR_RECV) && rs485->addr_recv) in uart_check_rs485_flags()
1317 if (!(rs485->flags & SER_RS485_ADDR_DEST) && rs485->addr_dest) in uart_check_rs485_flags()
1324 struct serial_rs485 *rs485) in uart_sanitize_serial_rs485_delays() argument
1327 if (rs485->delay_rts_before_send) { in uart_sanitize_serial_rs485_delays()
1332 rs485->delay_rts_before_send = 0; in uart_sanitize_serial_rs485_delays()
[all …]
H A Domap-serial.c285 if (port->rs485.flags & SER_RS485_ENABLED) { in serial_omap_stop_tx()
296 res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? in serial_omap_stop_tx()
299 if (port->rs485.delay_rts_after_send > 0) in serial_omap_stop_tx()
301 port->rs485.delay_rts_after_send); in serial_omap_stop_tx()
338 if ((up->port.rs485.flags & SER_RS485_ENABLED) && in serial_omap_put_char()
339 !(up->port.rs485.flags & SER_RS485_RX_DURING_TX)) in serial_omap_put_char()
367 if (port->rs485.flags & SER_RS485_ENABLED) { in serial_omap_start_tx()
373 res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0; in serial_omap_start_tx()
376 if (port->rs485.delay_rts_before_send > 0) in serial_omap_start_tx()
377 mdelay(port->rs485.delay_rts_before_send); in serial_omap_start_tx()
[all …]
/linux/include/uapi/linux/
H A Dserial.h112 * struct serial_rs485 - serial interface for controlling RS485 settings.
113 * @flags: RS485 feature flags.
116 * @addr_recv: Receive filter for RS485 addressing mode
118 * @addr_dest: Destination address for RS485 addressing mode
126 * Serial interface for controlling RS485 settings on chips with suitable
133 * * %SER_RS485_ENABLED - RS485 enabled.
136 * * %SER_RS485_RX_DURING_TX - Full-duplex RS485 line.
138 * * %SER_RS485_ADDRB - Enable RS485 addressing mode.
/linux/arch/arm64/boot/dts/freescale/
H A Dimx8mm-venice-gw72xx-0x-rs485.dtso5 * GW72xx RS485 HD:
9 * - UART4_TX is DE for RS485 transmitter
22 rs485-en-hog {
29 rs485-hd-hog {
41 linux,rs485-enabled-at-boot-time;
H A Dimx8mm-venice-gw72xx-0x-rs422.dtso5 * GW72xx RS422 (RS485 full duplex):
9 * - UART4_TX is DE for RS485 transmitter
22 rs485-en-hog {
29 rs485-hd-hog {
41 linux,rs485-enabled-at-boot-time;
H A Dimx8mm-venice-gw73xx-0x-rs422.dtso5 * GW73xx RS422 (RS485 full duplex):
9 * - UART4_TX is DE for RS485 transmitter
22 rs485-en-hog {
29 rs485-hd-hog {
41 linux,rs485-enabled-at-boot-time;
H A Dimx8mm-venice-gw73xx-0x-rs485.dtso5 * GW73xx RS485 HD:
9 * - UART4_TX is DE for RS485 transmitter
22 rs485-en-hog {
29 rs485-hd-hog {
41 linux,rs485-enabled-at-boot-time;
H A Dimx8mm-phygate-tauri-l-rs232-rs485.dtso6 * Tauri-L RS232 + RS485:
22 uart4-rs485-en-hog {
39 /* UART4 - RS485 */
46 linux,rs485-enabled-at-boot-time;
H A Dimx8mm-verdin-dev.dtsi136 /* Verdin UART_1, connector X50 through RS485 transceiver */
138 linux,rs485-enabled-at-boot-time;
139 rs485-rts-active-low;
140 rs485-rx-during-tx;
H A Dimx95-toradex-smarc-dev.dts200 /* SMARC SER0, RS485 */
202 linux,rs485-enabled-at-boot-time;
203 rs485-rts-active-low;
204 rs485-rx-during-tx;
H A Dimx8mn-rve-gateway.dts95 linux,rs485-enabled-at-boot-time;
96 rs485-rts-active-low;
124 linux,rs485-enabled-at-boot-time;
125 rs485-rts-active-low;
/linux/arch/arm/boot/dts/microchip/
H A Daks-cdu.dts32 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;
45 rs485-rts-delay = <0 0>;
/linux/drivers/usb/serial/
H A Dxr_serial.c241 struct serial_rs485 rs485; member
651 rs485_enabled = !!(data->rs485.flags & SER_RS485_ENABLED); in xr_set_flow_mode()
655 if (data->rs485.flags & SER_RS485_RTS_ON_SEND) in xr_set_flow_mode()
825 static void xr_sanitize_serial_rs485(struct serial_rs485 *rs485) in xr_sanitize_serial_rs485() argument
827 if (!(rs485->flags & SER_RS485_ENABLED)) { in xr_sanitize_serial_rs485()
828 memset(rs485, 0, sizeof(*rs485)); in xr_sanitize_serial_rs485()
833 if (rs485->flags & SER_RS485_RTS_ON_SEND) in xr_sanitize_serial_rs485()
834 rs485->flags &= ~SER_RS485_RTS_AFTER_SEND; in xr_sanitize_serial_rs485()
836 rs485->flags |= SER_RS485_RTS_AFTER_SEND; in xr_sanitize_serial_rs485()
839 rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | in xr_sanitize_serial_rs485()
[all …]
/linux/arch/arm/boot/dts/ti/omap/
H A Dam335x-nano.dts171 rs485-rts-active-high;
172 rs485-rx-during-tx;
173 rs485-rts-delay = <1 1>;
174 linux,rs485-enabled-at-boot-time;
182 rs485-rts-active-high;
183 rs485-rts-delay = <1 1>;
184 linux,rs485-enabled-at-boot-time;
191 rs485-rts-active-high;
192 rs485-rx-during-tx;
193 rs485-rts-delay = <1 1>;
[all …]
H A Dam335x-regor.dtsi188 /* RS485 - UART1 */
190 uart1_rs485_pins: pinmux-uart1-rs485-pins {
203 linux,rs485-enabled-at-boot-time;
208 rs485-rts-active-low;
/linux/arch/arm/boot/dts/nxp/imx/
H A Dimx6qdl-dhcom-drc02.dtsi30 rs485-rx-en-hog {
33 line-name = "rs485-rx-en";
85 * On DRC02 this UART is used as RS485 interface and RS485_TX_En is
92 linux,rs485-enabled-at-boot-time;
122 * P: uart5 rs485-tx-en
123 * Q: uart5 rs485-rx-en
H A Dimx6ull-dhcom-drc02.dts59 rs485-rx-en-hog {
62 line-name = "rs485-rx-en";
94 /* Use UART as RS485 */
97 linux,rs485-enabled-at-boot-time;
/linux/arch/arm64/boot/dts/rockchip/
H A Drk3588-jaguar-ethernet-switch.dtso12 * - RS232/RS485 (max 250Kbps/500Kbps, RX pin1, TX pin2)
190 /* GPIO3_D0/EN_RS485_MODE for switching between RS232 and RS485 */
193 linux,rs485-enabled-at-boot-time;
/linux/arch/arm64/boot/dts/ti/
H A Dk3-am62p-verdin-dev.dtsi169 /* Verdin UART_1, connector X50 through RS485 transceiver */
171 rs485-rx-during-tx;
172 linux,rs485-enabled-at-boot-time;
H A Dk3-am62-verdin-dev.dtsi169 /* Verdin UART_1, connector X50 through RS485 transceiver. */
171 linux,rs485-enabled-at-boot-time;
172 rs485-rx-during-tx;

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