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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/soc/samsung/exynos-usi.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Samsung's Exynos USI (Universal Serial Interface) binding
maintainers:
- Sam Protsenko <semen.protsenko@linaro.org>
- Krzysztof Kozlowski <krzk@kernel.org>
description: |
USI IP-core provides selectable serial protocol (UART, SPI or High-Speed I2C).
USI shares almost all internal circuits within each protocol, so only one
protocol can be chosen at a time. USI is modeled as a node with zero or more
child nodes, each representing a serial sub-node device. The mode setting
selects which particular function will be used.
properties:
$nodename:
pattern: "^usi@[0-9a-f]+$"
compatible:
oneOf:
- items:
- const: samsung,exynosautov9-usi
- const: samsung,exynos850-usi
- enum:
- samsung,exynos850-usi
reg: true
clocks: true
clock-names: true
ranges: true
"#address-cells":
const: 1
"#size-cells":
const: 1
samsung,sysreg:
$ref: /schemas/types.yaml#/definitions/phandle-array
items:
- items:
- description: phandle to System Register syscon node
- description: offset of SW_CONF register for this USI controller
description:
Should be phandle/offset pair. The phandle to System Register syscon node
(for the same domain where this USI controller resides) and the offset
of SW_CONF register for this USI controller.
samsung,mode:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Selects USI function (which serial protocol to use). Refer to
<include/dt-bindings/soc/samsung,exynos-usi.h> for valid USI mode values.
samsung,clkreq-on:
type: boolean
description:
Enable this property if underlying protocol requires the clock to be
continuously provided without automatic gating. As suggested by SoC
manual, it should be set in case of SPI/I2C slave, UART Rx and I2C
multi-master mode. Usually this property is needed if USI mode is set
to "UART".
This property is optional.
patternProperties:
"^i2c@[0-9a-f]+$":
$ref: /schemas/i2c/i2c-exynos5.yaml
description: Child node describing underlying I2C
"^serial@[0-9a-f]+$":
$ref: /schemas/serial/samsung_uart.yaml
description: Child node describing underlying UART/serial
"^spi@[0-9a-f]+$":
$ref: /schemas/spi/samsung,spi.yaml
description: Child node describing underlying SPI
required:
- compatible
- ranges
- "#address-cells"
- "#size-cells"
- samsung,sysreg
- samsung,mode
if:
properties:
compatible:
contains:
enum:
- samsung,exynos850-usi
then:
properties:
reg:
maxItems: 1
clocks:
items:
- description: Bus (APB) clock
- description: Operating clock for UART/SPI/I2C protocol
clock-names:
items:
- const: pclk
- const: ipclk
required:
- reg
- clocks
- clock-names
else:
properties:
reg: false
clocks: false
clock-names: false
samsung,clkreq-on: false
additionalProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/soc/samsung,exynos-usi.h>
usi0: usi@138200c0 {
compatible = "samsung,exynos850-usi";
reg = <0x138200c0 0x20>;
samsung,sysreg = <&sysreg_peri 0x1010>;
samsung,mode = <USI_V2_UART>;
samsung,clkreq-on; /* needed for UART mode */
#address-cells = <1>;
#size-cells = <1>;
ranges;
clocks = <&cmu_peri 32>, <&cmu_peri 31>;
clock-names = "pclk", "ipclk";
serial_0: serial@13820000 {
compatible = "samsung,exynos850-uart";
reg = <0x13820000 0xc0>;
interrupts = <GIC_SPI 227 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&cmu_peri 32>, <&cmu_peri 31>;
clock-names = "uart", "clk_uart_baud0";
status = "disabled";
};
hsi2c_0: i2c@13820000 {
compatible = "samsung,exynosautov9-hsi2c";
reg = <0x13820000 0xc0>;
interrupts = <GIC_SPI 227 IRQ_TYPE_LEVEL_HIGH>;
#address-cells = <1>;
#size-cells = <0>;
clocks = <&cmu_peri 31>, <&cmu_peri 32>;
clock-names = "hsi2c", "hsi2c_pclk";
status = "disabled";
};
};
|
