xref: /linux/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-mc.yaml (revision a4eb44a6435d6d8f9e642407a4a06f65eb90ca04) 
1# SPDX-License-Identifier: (GPL-2.0)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/memory-controllers/nvidia,tegra124-mc.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: NVIDIA Tegra124 SoC Memory Controller
8
9maintainers:
10  - Jon Hunter <jonathanh@nvidia.com>
11  - Thierry Reding <thierry.reding@gmail.com>
12
13description: |
14  Tegra124 SoC features a hybrid 2x32-bit / 1x64-bit memory controller.
15  These are interleaved to provide high performance with the load shared across
16  two memory channels. The Tegra124 Memory Controller handles memory requests
17  from internal clients and arbitrates among them to allocate memory bandwidth
18  for DDR3L and LPDDR3 SDRAMs.
19
20properties:
21  compatible:
22    const: nvidia,tegra124-mc
23
24  reg:
25    maxItems: 1
26
27  clocks:
28    maxItems: 1
29
30  clock-names:
31    items:
32      - const: mc
33
34  interrupts:
35    maxItems: 1
36
37  "#reset-cells":
38    const: 1
39
40  "#iommu-cells":
41    const: 1
42
43  "#interconnect-cells":
44    const: 1
45
46patternProperties:
47  "^emc-timings-[0-9]+$":
48    type: object
49    properties:
50      nvidia,ram-code:
51        $ref: /schemas/types.yaml#/definitions/uint32
52        description:
53          Value of RAM_CODE this timing set is used for.
54
55    patternProperties:
56      "^timing-[0-9]+$":
57        type: object
58        properties:
59          clock-frequency:
60            description:
61              Memory clock rate in Hz.
62            minimum: 1000000
63            maximum: 1066000000
64
65          nvidia,emem-configuration:
66            $ref: /schemas/types.yaml#/definitions/uint32-array
67            description: |
68              Values to be written to the EMEM register block. See section
69              "15.6.1 MC Registers" in the TRM.
70            items:
71              - description: MC_EMEM_ARB_CFG
72              - description: MC_EMEM_ARB_OUTSTANDING_REQ
73              - description: MC_EMEM_ARB_TIMING_RCD
74              - description: MC_EMEM_ARB_TIMING_RP
75              - description: MC_EMEM_ARB_TIMING_RC
76              - description: MC_EMEM_ARB_TIMING_RAS
77              - description: MC_EMEM_ARB_TIMING_FAW
78              - description: MC_EMEM_ARB_TIMING_RRD
79              - description: MC_EMEM_ARB_TIMING_RAP2PRE
80              - description: MC_EMEM_ARB_TIMING_WAP2PRE
81              - description: MC_EMEM_ARB_TIMING_R2R
82              - description: MC_EMEM_ARB_TIMING_W2W
83              - description: MC_EMEM_ARB_TIMING_R2W
84              - description: MC_EMEM_ARB_TIMING_W2R
85              - description: MC_EMEM_ARB_DA_TURNS
86              - description: MC_EMEM_ARB_DA_COVERS
87              - description: MC_EMEM_ARB_MISC0
88              - description: MC_EMEM_ARB_MISC1
89              - description: MC_EMEM_ARB_RING1_THROTTLE
90
91        required:
92          - clock-frequency
93          - nvidia,emem-configuration
94
95        additionalProperties: false
96
97    required:
98      - nvidia,ram-code
99
100    additionalProperties: false
101
102required:
103  - compatible
104  - reg
105  - interrupts
106  - clocks
107  - clock-names
108  - "#reset-cells"
109  - "#iommu-cells"
110  - "#interconnect-cells"
111
112additionalProperties: false
113
114examples:
115  - |
116    memory-controller@70019000 {
117        compatible = "nvidia,tegra124-mc";
118        reg = <0x70019000 0x1000>;
119        clocks = <&tegra_car 32>;
120        clock-names = "mc";
121
122        interrupts = <0 77 4>;
123
124        #iommu-cells = <1>;
125        #reset-cells = <1>;
126        #interconnect-cells = <1>;
127
128        emc-timings-3 {
129            nvidia,ram-code = <3>;
130
131            timing-12750000 {
132                clock-frequency = <12750000>;
133
134                nvidia,emem-configuration = <
135                    0x40040001 /* MC_EMEM_ARB_CFG */
136                    0x8000000a /* MC_EMEM_ARB_OUTSTANDING_REQ */
137                    0x00000001 /* MC_EMEM_ARB_TIMING_RCD */
138                    0x00000001 /* MC_EMEM_ARB_TIMING_RP */
139                    0x00000002 /* MC_EMEM_ARB_TIMING_RC */
140                    0x00000000 /* MC_EMEM_ARB_TIMING_RAS */
141                    0x00000002 /* MC_EMEM_ARB_TIMING_FAW */
142                    0x00000001 /* MC_EMEM_ARB_TIMING_RRD */
143                    0x00000002 /* MC_EMEM_ARB_TIMING_RAP2PRE */
144                    0x00000008 /* MC_EMEM_ARB_TIMING_WAP2PRE */
145                    0x00000003 /* MC_EMEM_ARB_TIMING_R2R */
146                    0x00000002 /* MC_EMEM_ARB_TIMING_W2W */
147                    0x00000003 /* MC_EMEM_ARB_TIMING_R2W */
148                    0x00000006 /* MC_EMEM_ARB_TIMING_W2R */
149                    0x06030203 /* MC_EMEM_ARB_DA_TURNS */
150                    0x000a0402 /* MC_EMEM_ARB_DA_COVERS */
151                    0x77e30303 /* MC_EMEM_ARB_MISC0 */
152                    0x70000f03 /* MC_EMEM_ARB_MISC1 */
153                    0x001f0000 /* MC_EMEM_ARB_RING1_THROTTLE */
154                >;
155            };
156        };
157    };
158