1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/serial/rs48 4 $id: http://devicetree.org/schemas/serial/rs485.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: RS485 serial communications 7 title: RS485 serial communications
8 8
9 description: The RTS signal is capable of auto 9 description: The RTS signal is capable of automatically controlling line
10 direction for the built-in half-duplex mode. 10 direction for the built-in half-duplex mode. The properties described
11 hereafter shall be given to a half-duplex ca 11 hereafter shall be given to a half-duplex capable UART node.
12 12
13 maintainers: 13 maintainers:
14 - Rob Herring <robh@kernel.org> 14 - Rob Herring <robh@kernel.org>
15 15
16 properties: 16 properties:
17 rs485-rts-delay: 17 rs485-rts-delay:
18 description: prop-encoded-array <a b> 18 description: prop-encoded-array <a b>
19 $ref: /schemas/types.yaml#/definitions/uin 19 $ref: /schemas/types.yaml#/definitions/uint32-array
20 items: 20 items:
21 items: 21 items:
22 - description: Delay between rts signa 22 - description: Delay between rts signal and beginning of data sent in
23 milliseconds. It corresponds to th 23 milliseconds. It corresponds to the delay before sending data.
24 default: 0 24 default: 0
25 maximum: 100 25 maximum: 100
26 - description: Delay between end of da 26 - description: Delay between end of data sent and rts signal in milliseconds.
27 It corresponds to the delay after 27 It corresponds to the delay after sending data and actual release
28 of the line. 28 of the line.
29 default: 0 29 default: 0
30 maximum: 100 30 maximum: 100
31 31
32 rs485-rts-active-high: 32 rs485-rts-active-high:
33 description: drive RTS high when sending ( 33 description: drive RTS high when sending (this is the default).
34 $ref: /schemas/types.yaml#/definitions/fla 34 $ref: /schemas/types.yaml#/definitions/flag
35 35
36 rs485-rts-active-low: 36 rs485-rts-active-low:
37 description: drive RTS low when sending (d 37 description: drive RTS low when sending (default is high).
38 $ref: /schemas/types.yaml#/definitions/fla 38 $ref: /schemas/types.yaml#/definitions/flag
39 39
40 rs485-rx-active-high: 40 rs485-rx-active-high:
41 description: Polarity of receiver enable s 41 description: Polarity of receiver enable signal (when separate from RTS).
42 True indicates active high (default is l 42 True indicates active high (default is low).
43 $ref: /schemas/types.yaml#/definitions/fla 43 $ref: /schemas/types.yaml#/definitions/flag
44 44
45 linux,rs485-enabled-at-boot-time: 45 linux,rs485-enabled-at-boot-time:
46 description: enables the rs485 feature at 46 description: enables the rs485 feature at boot time. It can be disabled
47 later with proper ioctl. 47 later with proper ioctl.
48 $ref: /schemas/types.yaml#/definitions/fla 48 $ref: /schemas/types.yaml#/definitions/flag
49 49
50 rs485-rx-during-tx: 50 rs485-rx-during-tx:
51 description: enables the receiving of data 51 description: enables the receiving of data even while sending data.
52 $ref: /schemas/types.yaml#/definitions/fla 52 $ref: /schemas/types.yaml#/definitions/flag
53 53
54 rs485-term-gpios: 54 rs485-term-gpios:
55 description: GPIO pin to enable RS485 bus 55 description: GPIO pin to enable RS485 bus termination.
56 maxItems: 1 56 maxItems: 1
57 57
58 rs485-rx-during-tx-gpios: 58 rs485-rx-during-tx-gpios:
59 description: Output GPIO pin that sets the 59 description: Output GPIO pin that sets the state of rs485-rx-during-tx. This
60 signal can be used to control the RX par 60 signal can be used to control the RX part of an RS485 transceiver. Thereby
61 the active state enables RX during TX. 61 the active state enables RX during TX.
62 maxItems: 1 62 maxItems: 1
63 63
64 additionalProperties: true 64 additionalProperties: true
65 65
66 ... 66 ...
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