1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-C 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/nvmem/nvmem 4 $id: http://devicetree.org/schemas/nvmem/nvmem.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: NVMEM (Non Volatile Memory) !! 7 title: NVMEM (Non Volatile Memory) Device Tree Bindings
8 8
9 maintainers: 9 maintainers:
10 - Srinivas Kandagatla <srinivas.kandagatla@li 10 - Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
11 11
12 description: | 12 description: |
13 This binding is intended to represent the lo 13 This binding is intended to represent the location of hardware
14 configuration data stored in NVMEMs like eep 14 configuration data stored in NVMEMs like eeprom, efuses and so on.
15 15
16 On a significant proportion of boards, the m 16 On a significant proportion of boards, the manufacturer has stored
17 some data on NVMEM, for the OS to be able to 17 some data on NVMEM, for the OS to be able to retrieve these
18 information and act upon it. Obviously, the 18 information and act upon it. Obviously, the OS has to know about
19 where to retrieve these data from, and where 19 where to retrieve these data from, and where they are stored on the
20 storage device. 20 storage device.
21 21
22 properties: 22 properties:
>> 23 $nodename:
>> 24 pattern: "^(eeprom|efuse|nvram)(@.*|-[0-9a-f])*$"
>> 25
23 "#address-cells": 26 "#address-cells":
24 const: 1 27 const: 1
25 28
26 "#size-cells": 29 "#size-cells":
27 const: 1 30 const: 1
28 31
29 read-only: 32 read-only:
30 $ref: /schemas/types.yaml#/definitions/fla 33 $ref: /schemas/types.yaml#/definitions/flag
31 description: 34 description:
32 Mark the provider as read only. 35 Mark the provider as read only.
33 36
34 wp-gpios: !! 37 patternProperties:
35 description: !! 38 "^.*@[0-9a-f]+$":
36 GPIO to which the write-protect pin of t !! 39 type: object
37 The write-protect GPIO is asserted, when !! 40
38 (logical '1') to block the write operati !! 41 properties:
39 when it's driven low (logical '0') to al !! 42 reg:
40 maxItems: 1 !! 43 maxItems: 1
>> 44 description:
>> 45 Offset and size in bytes within the storage device.
>> 46
>> 47 bits:
>> 48 maxItems: 1
>> 49 items:
>> 50 items:
>> 51 - minimum: 0
>> 52 maximum: 7
>> 53 description:
>> 54 Offset in bit within the address range specified by reg.
>> 55 - minimum: 1
>> 56 description:
>> 57 Size in bit within the address range specified by reg.
41 58
42 nvmem-layout: !! 59 required:
43 $ref: /schemas/nvmem/layouts/nvmem-layout. !! 60 - reg
44 description: <<
45 Alternative to the statically defined nv <<
46 container may reference more advanced (d <<
47 parsers. <<
48 61
49 additionalProperties: true !! 62 additionalProperties: false
50 63
51 examples: 64 examples:
52 - | 65 - |
53 #include <dt-bindings/gpio/gpio.h> <<
54 <<
55 qfprom: eeprom@700000 { 66 qfprom: eeprom@700000 {
56 compatible = "qcom,msm8974-qfprom", <<
57 #address-cells = <1>; 67 #address-cells = <1>;
58 #size-cells = <1>; 68 #size-cells = <1>;
59 reg = <0x00700000 0x100000>; <<
60 <<
61 wp-gpios = <&gpio1 3 GPIO_ACTIVE_HIG <<
62 69
63 /* ... */ 70 /* ... */
64 71
65 nvmem-layout { !! 72 /* Data cells */
66 compatible = "fixed-layout"; !! 73 tsens_calibration: calib@404 {
67 #address-cells = <1>; !! 74 reg = <0x404 0x10>;
68 #size-cells = <1>; !! 75 };
69 !! 76
70 /* Data cells */ !! 77 tsens_calibration_bckp: calib_bckp@504 {
71 tsens_calibration: calib@404 { !! 78 reg = <0x504 0x11>;
72 reg = <0x404 0x10>; !! 79 bits = <6 128>;
73 }; !! 80 };
74 !! 81
75 tsens_calibration_bckp: calib_bc !! 82 pvs_version: pvs-version@6 {
76 reg = <0x504 0x11>; !! 83 reg = <0x6 0x2>;
77 bits = <6 128>; !! 84 bits = <7 2>;
78 }; !! 85 };
79 !! 86
80 pvs_version: pvs-version@6 { !! 87 speed_bin: speed-bin@c{
81 reg = <0x6 0x2>; !! 88 reg = <0xc 0x1>;
82 bits = <7 2>; !! 89 bits = <2 3>;
83 }; <<
84 <<
85 speed_bin: speed-bin@c{ <<
86 reg = <0xc 0x1>; <<
87 bits = <2 3>; <<
88 }; <<
89 }; 90 };
90 }; 91 };
91 92
92 ... 93 ...
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