1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/spi/spi-sifive.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: SiFive SPI controller
maintainers:
- Pragnesh Patel <pragnesh.patel@sifive.com>
- Paul Walmsley <paul.walmsley@sifive.com>
- Palmer Dabbelt <palmer@sifive.com>
allOf:
- $ref: spi-controller.yaml#
properties:
compatible:
items:
- enum:
- sifive,fu540-c000-spi
- sifive,fu740-c000-spi
- const: sifive,spi0
description:
Should be "sifive,<chip>-spi" and "sifive,spi<version>".
Supported compatible strings are -
"sifive,fu540-c000-spi" and "sifive,fu740-c000-spi" for the SiFive SPI v0
as integrated onto the SiFive FU540 and FU740 chip resp, and "sifive,spi0"
for the SiFive SPI v0 IP block with no chip integration tweaks.
Please refer to sifive-blocks-ip-versioning.txt for details
SPI RTL that corresponds to the IP block version numbers can be found here -
https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/spi
reg:
minItems: 1
items:
- description: SPI registers region
- description: Memory mapped flash region
interrupts:
maxItems: 1
clocks:
maxItems: 1
description:
Must reference the frequency given to the controller
sifive,fifo-depth:
description:
Depth of hardware queues; defaults to 8
$ref: /schemas/types.yaml#/definitions/uint32
enum: [8]
default: 8
sifive,max-bits-per-word:
description:
Maximum bits per word; defaults to 8
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3, 4, 5, 6, 7, 8]
default: 8
required:
- compatible
- reg
- interrupts
- clocks
unevaluatedProperties: false
examples:
- |
spi: spi@10040000 {
compatible = "sifive,fu540-c000-spi", "sifive,spi0";
reg = <0x10040000 0x1000>, <0x20000000 0x10000000>;
interrupt-parent = <&plic>;
interrupts = <51>;
clocks = <&tlclk>;
#address-cells = <1>;
#size-cells = <0>;
sifive,fifo-depth = <8>;
sifive,max-bits-per-word = <8>;
};
...
|
