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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/memory-controllers/ti,gpmc-child.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: device tree bindings for children of the Texas Instruments GPMC
maintainers:
- Tony Lindgren <tony@atomide.com>
- Roger Quadros <rogerq@kernel.org>
description:
This binding is meant for the child nodes of the GPMC node. The node
represents any device connected to the GPMC bus. It may be a Flash chip,
RAM chip or Ethernet controller, etc. These properties are meant for
configuring the GPMC settings/timings and will accompany the bindings
supported by the respective device.
properties:
reg: true
# GPMC Timing properties for child nodes. All are optional and default to 0.
gpmc,sync-clk-ps:
description: Minimum clock period for synchronous mode
default: 0
# Chip-select signal timings corresponding to GPMC_CONFIG2:
gpmc,cs-on-ns:
description: Assertion time
default: 0
gpmc,cs-rd-off-ns:
description: Read deassertion time
default: 0
gpmc,cs-wr-off-ns:
description: Write deassertion time
default: 0
# ADV signal timings corresponding to GPMC_CONFIG3:
gpmc,adv-on-ns:
description: Assertion time
default: 0
gpmc,adv-rd-off-ns:
description: Read deassertion time
default: 0
gpmc,adv-wr-off-ns:
description: Write deassertion time
default: 0
gpmc,adv-aad-mux-on-ns:
description: Assertion time for AAD
default: 0
gpmc,adv-aad-mux-rd-off-ns:
description: Read deassertion time for AAD
default: 0
gpmc,adv-aad-mux-wr-off-ns:
description: Write deassertion time for AAD
default: 0
# WE signals timings corresponding to GPMC_CONFIG4:
gpmc,we-on-ns:
description: Assertion time
default: 0
gpmc,we-off-ns:
description: Deassertion time
default: 0
# OE signals timings corresponding to GPMC_CONFIG4:
gpmc,oe-on-ns:
description: Assertion time
default: 0
gpmc,oe-off-ns:
description: Deassertion time
default: 0
gpmc,oe-aad-mux-on-ns:
description: Assertion time for AAD
default: 0
gpmc,oe-aad-mux-off-ns:
description: Deassertion time for AAD
default: 0
# Access time and cycle time timings (in nanoseconds) corresponding to
# GPMC_CONFIG5:
gpmc,page-burst-access-ns:
description: Multiple access word delay
default: 0
gpmc,access-ns:
description: Start-cycle to first data valid delay
default: 0
gpmc,rd-cycle-ns:
description: Total read cycle time
default: 0
gpmc,wr-cycle-ns:
description: Total write cycle time
default: 0
gpmc,bus-turnaround-ns:
description: Turn-around time between successive accesses
default: 0
gpmc,cycle2cycle-delay-ns:
description: Delay between chip-select pulses
default: 0
gpmc,clk-activation-ns:
description: GPMC clock activation time
default: 0
gpmc,wait-monitoring-ns:
description: Start of wait monitoring with regard to valid data
default: 0
# Boolean timing parameters. If property is present, parameter is enabled
# otherwise disabled.
gpmc,adv-extra-delay:
description: ADV signal is delayed by half GPMC clock
type: boolean
gpmc,cs-extra-delay:
description: CS signal is delayed by half GPMC clock
type: boolean
gpmc,cycle2cycle-diffcsen:
description: |
Add "cycle2cycle-delay" between successive accesses
to a different CS
type: boolean
gpmc,cycle2cycle-samecsen:
description: |
Add "cycle2cycle-delay" between successive accesses
to the same CS
type: boolean
gpmc,oe-extra-delay:
description: OE signal is delayed by half GPMC clock
type: boolean
gpmc,we-extra-delay:
description: WE signal is delayed by half GPMC clock
type: boolean
gpmc,time-para-granularity:
description: Multiply all access times by 2
type: boolean
# The following two properties are applicable only to OMAP3+ and AM335x:
gpmc,wr-access-ns:
description: |
In synchronous write mode, for single or
burst accesses, defines the number of
GPMC_FCLK cycles from start access time
to the GPMC_CLK rising edge used by the
memory device for the first data capture.
default: 0
gpmc,wr-data-mux-bus-ns:
description: |
In address-data multiplex mode, specifies
the time when the first data is driven on
the address-data bus.
default: 0
# GPMC chip-select settings properties for child nodes. All are optional.
gpmc,burst-length:
description: Page/burst length.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 4, 8, 16]
default: 0
gpmc,burst-wrap:
description: Enables wrap bursting
type: boolean
gpmc,burst-read:
description: Enables read page/burst mode
type: boolean
gpmc,burst-write:
description: Enables write page/burst mode
type: boolean
gpmc,device-width:
description: |
Total width of device(s) connected to a GPMC
chip-select in bytes. The GPMC supports 8-bit
and 16-bit devices and so this property must be
1 or 2.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [1, 2]
default: 1
gpmc,mux-add-data:
description: |
Address and data multiplexing configuration.
Valid values are
0 for Non multiplexed mode
1 for address-address-data multiplexing mode and
2 for address-data multiplexing mode.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2]
gpmc,sync-read:
description: |
Enables synchronous read. Defaults to asynchronous
is this is not set.
type: boolean
gpmc,sync-write:
description: |
Enables synchronous writes. Defaults to asynchronous
is this is not set.
type: boolean
gpmc,wait-pin:
description: |
Wait-pin used by client. Must be less than "gpmc,num-waitpins".
$ref: /schemas/types.yaml#/definitions/uint32
gpmc,wait-on-read:
description: Enables wait monitoring on reads.
type: boolean
gpmc,wait-on-write:
description: Enables wait monitoring on writes.
type: boolean
required:
- reg
# the GPMC child will have its own native properties
additionalProperties: true
|
