summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/mtd/mtd-physmap.yaml
blob: 18f6733408b493bb53351d6e0560ab0a0a435cad (plain)
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
# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/mtd/mtd-physmap.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: CFI or JEDEC memory-mapped NOR flash, MTD-RAM (NVRAM...)

maintainers:
  - Rob Herring <robh@kernel.org>

description: |
  Flash chips (Memory Technology Devices) are often used for solid state
  file systems on embedded devices.

allOf:
  - $ref: mtd.yaml#
  - $ref: /schemas/memory-controllers/mc-peripheral-props.yaml#

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - amd,s29gl01gp
              - amd,s29gl032a
              - amd,s29gl256n
              - amd,s29gl512n
              - arm,versatile-flash
              - arm,vexpress-flash
              - cortina,gemini-flash
              - cypress,hyperflash
              - ge,imp3a-firmware-mirror
              - ge,imp3a-paged-flash
              - gef,ppc9a-firmware-mirror
              - gef,ppc9a-paged-flash
              - gef,sbc310-firmware-mirror
              - gef,sbc310-paged-flash
              - gef,sbc610-firmware-mirror
              - gef,sbc610-paged-flash
              - intel,28f128j3
              - intel,dt28f160
              - intel,ixp4xx-flash
              - intel,JS28F128
              - intel,JS28F640
              - intel,PC28F640P30T85
              - numonyx,js28f00a
              - numonyx,js28f128
              - sst,sst39vf320
              - xlnx,xps-mch-emc-2.00.a
          - enum:
              - cfi-flash
              - jedec-flash
      - items:
          - enum:
              - cypress,cy7c1019dv33-10zsxi
              - arm,vexpress-psram
          - const: mtd-ram
      - enum:
          - cfi-flash
          - jedec-flash
          - mtd-ram
          - mtd-rom

  reg:
    description: |
      It's possible to (optionally) define multiple "reg" tuples so that
      non-identical chips can be described in one node.
    minItems: 1
    maxItems: 8

  bank-width:
    description: Width (in bytes) of the bank.  Equal to the device width times
      the number of interleaved chips.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [ 1, 2, 4 ]

  device-width:
    description:
      Width of a single mtd chip. If omitted, assumed to be equal to 'bank-width'.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [ 1, 2 ]

  no-unaligned-direct-access:
    type: boolean
    description: |
      Disables the default direct mapping of the flash.

      On some platforms (e.g. MPC5200) a direct 1:1 mapping may cause problems
      with JFFS2 usage, as the local bus (LPB) doesn't support unaligned
      accesses as implemented in the JFFS2 code via memcpy(). By defining
      "no-unaligned-direct-access", the flash will not be exposed directly to
      the MTD users (e.g. JFFS2) any more.

  linux,mtd-name:
    description:
      Allows specifying the mtd name for retro capability with physmap-flash
      drivers as boot loader pass the mtd partition via the old device name
      physmap-flash.
    $ref: /schemas/types.yaml#/definitions/string

  use-advanced-sector-protection:
    type: boolean
    description: |
      Enables support for the advanced sector protection (Spansion: PPB -
      Persistent Protection Bits) locking.

  erase-size:
    description: The chip's physical erase block size in bytes.
    $ref: /schemas/types.yaml#/definitions/uint32

  addr-gpios:
    description:
      List of GPIO descriptors that will be used to address the MSBs address
      lines. The order goes from LSB to MSB.
    minItems: 1
    maxItems: 8

  '#address-cells':
    const: 1

  '#size-cells':
    const: 1

  big-endian: true
  little-endian: true

required:
  - compatible
  - reg

if:
  properties:
    compatible:
      contains:
        const: cortina,gemini-flash
then:
  properties:
    syscon:
      $ref: /schemas/types.yaml#/definitions/phandle
      description:
        Phandle to the syscon controller
  required:
    - syscon

# FIXME: A parent bus may define timing properties
additionalProperties: true

examples:
  - |

    flash@ff000000 {
        compatible = "cfi-flash";
        reg = <0xff000000 0x01000000>;
        bank-width = <4>;
        device-width = <1>;

        #address-cells = <1>;
        #size-cells = <1>;
        ranges = <0 0xff000000 0x01000000>;

        fs@0 {
            label = "fs";
            reg = <0 0xf80000>;
        };
        firmware@f80000 {
            label = "firmware";
            reg = <0xf80000 0x80000>;
            read-only;
        };
    };

  - |
    /* An example with multiple "reg" tuples */

    flash@0 {
        compatible = "intel,PC28F640P30T85", "cfi-flash";
        reg = <0x00000000 0x02000000>,
              <0x02000000 0x02000000>;
        bank-width = <2>;

        #address-cells = <1>;
        #size-cells = <1>;
        ranges = <0 0 0x04000000>;

        partition@0 {
            label = "test-part1";
            reg = <0 0x04000000>;
        };
    };

  - |
    /* An example using SRAM */
    bus {
        #address-cells = <2>;
        #size-cells = <1>;

        sram@2,0 {
            compatible = "mtd-ram";
            reg = <2 0 0x00200000>;
            bank-width = <2>;
        };
    };

  - |
    /* An example using addr-gpios */
    #include <dt-bindings/gpio/gpio.h>

    flash@20000000 {
        compatible = "cfi-flash";
        reg = <0x20000000 0x02000000>;
        bank-width = <2>;
        addr-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;

        #address-cells = <1>;
        #size-cells = <1>;
        ranges = <0 0x00000000 0x02000000>,
                 <1 0x02000000 0x02000000>;

        partition@0 {
            label = "test-part1";
            reg = <0 0x04000000>;
        };
    };
...