1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/spi/spi-peripheral-props.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Peripheral-specific properties for a SPI bus.
8
9description:
10  Many SPI controllers need to add properties to peripheral devices. They could
11  be common properties like spi-max-frequency, spi-cpha, etc. or they could be
12  controller specific like delay in clock or data lines, etc. These properties
13  need to be defined in the peripheral node because they are per-peripheral and
14  there can be multiple peripherals attached to a controller. All those
15  properties are listed here. The controller specific properties should go in
16  their own separate schema that should be referenced from here.
17
18maintainers:
19  - Mark Brown <broonie@kernel.org>
20
21properties:
22  reg:
23    minItems: 1
24    maxItems: 256
25    items:
26      items:
27        - minimum: 0
28          maximum: 256
29    description:
30      Chip select used by the device.
31
32  spi-3wire:
33    $ref: /schemas/types.yaml#/definitions/flag
34    description:
35      The device requires 3-wire mode.
36
37  spi-cs-high:
38    $ref: /schemas/types.yaml#/definitions/flag
39    description:
40      The device requires the chip select active high.
41
42  spi-lsb-first:
43    $ref: /schemas/types.yaml#/definitions/flag
44    description:
45      The device requires the LSB first mode.
46
47  spi-max-frequency:
48    $ref: /schemas/types.yaml#/definitions/uint32
49    description:
50      Maximum SPI clocking speed of the device in Hz.
51
52  spi-rx-bus-width:
53    description:
54      Bus width to the SPI bus used for read transfers.
55      If 0 is provided, then no RX will be possible on this device.
56    $ref: /schemas/types.yaml#/definitions/uint32
57    enum: [0, 1, 2, 4, 8]
58    default: 1
59
60  spi-rx-delay-us:
61    description:
62      Delay, in microseconds, after a read transfer.
63
64  rx-sample-delay-ns:
65    description: SPI Rx sample delay offset, unit is nanoseconds.
66      The delay from the default sample time before the actual
67      sample of the rxd input signal occurs.
68
69  spi-tx-bus-width:
70    description:
71      Bus width to the SPI bus used for write transfers.
72      If 0 is provided, then no TX will be possible on this device.
73    $ref: /schemas/types.yaml#/definitions/uint32
74    enum: [0, 1, 2, 4, 8]
75    default: 1
76
77  spi-tx-delay-us:
78    description:
79      Delay, in microseconds, after a write transfer.
80
81  stacked-memories:
82    description: Several SPI memories can be wired in stacked mode.
83      This basically means that either a device features several chip
84      selects, or that different devices must be seen as a single
85      bigger chip. This basically doubles (or more) the total address
86      space with only a single additional wire, while still needing
87      to repeat the commands when crossing a chip boundary. The size of
88      each chip should be provided as members of the array.
89    $ref: /schemas/types.yaml#/definitions/uint64-array
90    minItems: 2
91    maxItems: 4
92
93  parallel-memories:
94    description: Several SPI memories can be wired in parallel mode.
95      The devices are physically on a different buses but will always
96      act synchronously as each data word is spread across the
97      different memories (eg. even bits are stored in one memory, odd
98      bits in the other). This basically doubles the address space and
99      the throughput while greatly complexifying the wiring because as
100      many busses as devices must be wired. The size of each chip should
101      be provided as members of the array.
102    $ref: /schemas/types.yaml#/definitions/uint64-array
103    minItems: 2
104    maxItems: 4
105
106# The controller specific properties go here.
107allOf:
108  - $ref: cdns,qspi-nor-peripheral-props.yaml#
109  - $ref: samsung,spi-peripheral-props.yaml#
110  - $ref: nvidia,tegra210-quad-peripheral-props.yaml#
111
112additionalProperties: true
113