xref: /linux/Documentation/devicetree/bindings/memory-controllers/exynos-srom.yaml (revision 1ac731c529cd4d6adbce134754b51ff7d822b145) 
1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/memory-controllers/exynos-srom.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Samsung Exynos SoC SROM Controller driver
8
9maintainers:
10  - Krzysztof Kozlowski <krzk@kernel.org>
11
12description: |+
13  The SROM controller can be used to attach external peripherals. In this case
14  extra properties, describing the bus behind it, should be specified.
15
16properties:
17  compatible:
18    items:
19      - const: samsung,exynos4210-srom
20
21  reg:
22    maxItems: 1
23
24  "#address-cells":
25    const: 2
26
27  "#size-cells":
28    const: 1
29
30  ranges:
31    minItems: 1
32    maxItems: 4
33    description: |
34      Reflects the memory layout with four integer values per bank. Format:
35      <bank-number> 0 <parent address of bank> <size>
36      Up to four banks are supported.
37
38patternProperties:
39  "^.*@[0-3],[a-f0-9]+$":
40    type: object
41    additionalProperties: true
42    description:
43      The actual device nodes should be added as subnodes to the SROMc node.
44      These subnodes, in addition to regular device specification, should
45      contain the following properties, describing configuration
46      of the relevant SROM bank.
47
48    properties:
49      reg:
50        description:
51          Bank number, base address (relative to start of the bank) and size
52          of the memory mapped for the device. Note that base address will be
53          typically 0 as this is the start of the bank.
54        maxItems: 1
55
56      reg-io-width:
57        enum: [1, 2]
58        description:
59          Data width in bytes (1 or 2). If omitted, default of 1 is used.
60
61      samsung,srom-page-mode:
62        description:
63          If page mode is set, 4 data page mode will be configured,
64          else normal (1 data) page mode will be set.
65        type: boolean
66
67      samsung,srom-timing:
68        $ref: /schemas/types.yaml#/definitions/uint32-array
69        items:
70          minItems: 6
71          maxItems: 6
72        description: |
73          Array of 6 integers, specifying bank timings in the following order:
74          Tacp, Tcah, Tcoh, Tacc, Tcos, Tacs.
75          Each value is specified in cycles and has the following meaning
76          and valid range:
77          Tacp: Page mode access cycle at Page mode (0 - 15)
78          Tcah: Address holding time after CSn (0 - 15)
79          Tcoh: Chip selection hold on OEn (0 - 15)
80          Tacc: Access cycle (0 - 31, the actual time is N + 1)
81          Tcos: Chip selection set-up before OEn (0 - 15)
82          Tacs: Address set-up before CSn (0 - 15)
83
84    required:
85      - reg
86      - samsung,srom-timing
87
88required:
89  - compatible
90  - reg
91
92additionalProperties: false
93
94examples:
95  - |
96    // Example: basic definition, no banks are configured
97    memory-controller@12560000 {
98        compatible = "samsung,exynos4210-srom";
99        reg = <0x12560000 0x14>;
100    };
101
102  - |
103    // Example: SROMc with SMSC911x ethernet chip on bank 3
104    memory-controller@12570000 {
105        #address-cells = <2>;
106        #size-cells = <1>;
107        ranges = <0 0 0x04000000 0x20000   // Bank0
108                  1 0 0x05000000 0x20000   // Bank1
109                  2 0 0x06000000 0x20000   // Bank2
110                  3 0 0x07000000 0x20000>; // Bank3
111
112        compatible = "samsung,exynos4210-srom";
113        reg = <0x12570000 0x14>;
114
115        ethernet@3,0 {
116            compatible = "smsc,lan9115";
117            reg = <3 0 0x10000>;     // Bank 3, offset = 0
118            phy-mode = "mii";
119            interrupt-parent = <&gpx0>;
120            interrupts = <5 8>;
121            reg-io-width = <2>;
122            smsc,irq-push-pull;
123            smsc,force-internal-phy;
124
125            samsung,srom-page-mode;
126            samsung,srom-timing = <9 12 1 9 1 1>;
127        };
128    };
129