xref: /linux/Documentation/devicetree/bindings/memory-controllers/arm,pl35x-smc.yaml (revision 6e7fd890f1d6ac83805409e9c346240de2705584) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/memory-controllers/arm,pl35x-smc.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Arm PL35x Series Static Memory Controller (SMC)
8
9maintainers:
10  - Miquel Raynal <miquel.raynal@bootlin.com>
11
12description: |
13  The PL35x Static Memory Controller is a bus where you can connect two kinds
14  of memory interfaces, which are NAND and memory mapped interfaces (such as
15  SRAM or NOR) depending on the specific configuration.
16
17  The TRM is available here:
18  https://documentation-service.arm.com/static/5e8e2524fd977155116a58aa
19
20# We need a select here so we don't match all nodes with 'arm,primecell'
21select:
22  properties:
23    compatible:
24      contains:
25        enum:
26          - arm,pl353-smc-r2p1
27          - arm,pl354
28  required:
29    - compatible
30
31properties:
32  $nodename:
33    pattern: "^memory-controller@[0-9a-f]+$"
34
35  compatible:
36    items:
37      - enum:
38          - arm,pl353-smc-r2p1
39          - arm,pl354
40      - const: arm,primecell
41
42  "#address-cells":
43    const: 2
44
45  "#size-cells":
46    const: 1
47
48  reg:
49    items:
50      - description:
51          Configuration registers for the host and sub-controllers.
52          The three chip select regions are defined in 'ranges'.
53
54  clocks:
55    minItems: 1
56    maxItems: 2
57
58  clock-names:
59    minItems: 1
60    maxItems: 2
61
62  ranges:
63    minItems: 1
64    maxItems: 8
65
66  interrupts:
67    minItems: 1
68    items:
69      - description: Combined or Memory interface 0 IRQ
70      - description: Memory interface 1 IRQ
71
72patternProperties:
73  "@[0-7],[a-f0-9]+$":
74    type: object
75    additionalProperties: true
76    description: |
77      The child device node represents the controller connected to the SMC
78      bus. The controller can be a NAND controller or a pair of any memory
79      mapped controllers such as NOR and SRAM controllers.
80
81    properties:
82      compatible:
83        description:
84          Compatible of memory controller.
85
86      reg:
87        items:
88          - items:
89              - description: |
90                  Chip-select ID, as in the parent range property.
91                minimum: 0
92                maximum: 7
93              - description: |
94                  Offset of the memory region requested by the device.
95              - description: |
96                  Length of the memory region requested by the device.
97
98    required:
99      - compatible
100      - reg
101
102required:
103  - compatible
104  - reg
105  - clock-names
106  - clocks
107
108additionalProperties: false
109
110allOf:
111  - if:
112      properties:
113        compatible:
114          contains:
115            const: arm,pl354
116    then:
117      properties:
118        clocks:
119          # According to TRM, really should be 3 clocks
120          maxItems: 1
121
122        clock-names:
123          const: apb_pclk
124
125    else:
126      properties:
127        clocks:
128          items:
129            - description: clock for the memory device bus
130            - description: main clock of the SMC
131
132        clock-names:
133          items:
134            - const: memclk
135            - const: apb_pclk
136
137examples:
138  - |
139    smcc: memory-controller@e000e000 {
140      compatible = "arm,pl353-smc-r2p1", "arm,primecell";
141      reg = <0xe000e000 0x0001000>;
142      clock-names = "memclk", "apb_pclk";
143      clocks = <&clkc 11>, <&clkc 44>;
144      ranges = <0x0 0x0 0xe1000000 0x1000000 /* Nand CS region */
145                0x1 0x0 0xe2000000 0x2000000 /* SRAM/NOR CS0 region */
146                0x2 0x0 0xe4000000 0x2000000>; /* SRAM/NOR CS1 region */
147      #address-cells = <2>;
148      #size-cells = <1>;
149
150      nfc0: nand-controller@0,0 {
151        compatible = "arm,pl353-nand-r2p1";
152        reg = <0 0 0x1000000>;
153        #address-cells = <1>;
154        #size-cells = <0>;
155      };
156    };
157