xref: /linux/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml (revision c532de5a67a70f8533d495f8f2aaa9a0491c3ad0) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2# Copyright (c) 2020 MediaTek Inc.
3%YAML 1.2
4---
5$id: http://devicetree.org/schemas/memory-controllers/mediatek,smi-common.yaml#
6$schema: http://devicetree.org/meta-schemas/core.yaml#
7
8title: SMI (Smart Multimedia Interface) Common
9
10maintainers:
11  - Yong Wu <yong.wu@mediatek.com>
12
13description: |
14  The hardware block diagram please check bindings/iommu/mediatek,iommu.yaml
15
16  MediaTek SMI have two generations of HW architecture, here is the list
17  which generation the SoCs use:
18  generation 1: mt2701 and mt7623.
19  generation 2: mt2712, mt6779, mt8167, mt8173, mt8183, mt8186, mt8188, mt8192 and mt8195.
20
21  There's slight differences between the two SMI, for generation 2, the
22  register which control the iommu port is at each larb's register base. But
23  for generation 1, the register is at smi ao base(smi always on register
24  base). Besides that, the smi async clock should be prepared and enabled for
25  SMI generation 1 to transform the smi clock into emi clock domain, but that is
26  not needed for SMI generation 2.
27
28properties:
29  compatible:
30    oneOf:
31      - enum:
32          - mediatek,mt2701-smi-common
33          - mediatek,mt2712-smi-common
34          - mediatek,mt6779-smi-common
35          - mediatek,mt6795-smi-common
36          - mediatek,mt8167-smi-common
37          - mediatek,mt8173-smi-common
38          - mediatek,mt8183-smi-common
39          - mediatek,mt8186-smi-common
40          - mediatek,mt8188-smi-common-vdo
41          - mediatek,mt8188-smi-common-vpp
42          - mediatek,mt8192-smi-common
43          - mediatek,mt8195-smi-common-vdo
44          - mediatek,mt8195-smi-common-vpp
45          - mediatek,mt8195-smi-sub-common
46          - mediatek,mt8365-smi-common
47
48      - description: for mt7623
49        items:
50          - const: mediatek,mt7623-smi-common
51          - const: mediatek,mt2701-smi-common
52
53  reg:
54    maxItems: 1
55
56  power-domains:
57    maxItems: 1
58
59  clocks:
60    description: |
61      apb and smi are mandatory. the async is only for generation 1 smi HW.
62      gals(global async local sync) also is optional, see below.
63    minItems: 2
64    items:
65      - description: apb is Advanced Peripheral Bus clock, It's the clock for
66          setting the register.
67      - description: smi is the clock for transfer data and command.
68      - description: Either asynchronous clock to help transform the smi clock
69          into the emi clock domain on Gen1 h/w, or the path0 clock of gals.
70      - description: gals1 is the path1 clock of gals.
71
72  clock-names:
73    minItems: 2
74    maxItems: 4
75
76  mediatek,smi:
77    $ref: /schemas/types.yaml#/definitions/phandle
78    description: a phandle to the smi-common node above. Only for sub-common.
79
80required:
81  - compatible
82  - reg
83  - power-domains
84  - clocks
85  - clock-names
86
87allOf:
88  - if:  # only for gen1 HW
89      properties:
90        compatible:
91          contains:
92            enum:
93              - mediatek,mt2701-smi-common
94    then:
95      properties:
96        clocks:
97          minItems: 3
98          maxItems: 3
99        clock-names:
100          items:
101            - const: apb
102            - const: smi
103            - const: async
104
105  - if:  # only for sub common
106      properties:
107        compatible:
108          contains:
109            enum:
110              - mediatek,mt8195-smi-sub-common
111    then:
112      required:
113        - mediatek,smi
114      properties:
115        clocks:
116          minItems: 3
117          maxItems: 3
118        clock-names:
119          items:
120            - const: apb
121            - const: smi
122            - const: gals0
123    else:
124      properties:
125        mediatek,smi: false
126
127  - if:  # for gen2 HW that have gals
128      properties:
129        compatible:
130          enum:
131            - mediatek,mt6779-smi-common
132            - mediatek,mt8183-smi-common
133            - mediatek,mt8186-smi-common
134            - mediatek,mt8192-smi-common
135            - mediatek,mt8195-smi-common-vdo
136            - mediatek,mt8195-smi-common-vpp
137            - mediatek,mt8365-smi-common
138
139    then:
140      properties:
141        clocks:
142          minItems: 4
143          maxItems: 4
144        clock-names:
145          items:
146            - const: apb
147            - const: smi
148            - const: gals0
149            - const: gals1
150
151  - if:  # for gen2 HW that don't have gals
152      properties:
153        compatible:
154          enum:
155            - mediatek,mt2712-smi-common
156            - mediatek,mt6795-smi-common
157            - mediatek,mt8167-smi-common
158            - mediatek,mt8173-smi-common
159
160    then:
161      properties:
162        clocks:
163          minItems: 2
164          maxItems: 2
165        clock-names:
166          items:
167            - const: apb
168            - const: smi
169
170additionalProperties: false
171
172examples:
173  - |+
174    #include <dt-bindings/clock/mt8173-clk.h>
175    #include <dt-bindings/power/mt8173-power.h>
176
177    smi_common: smi@14022000 {
178            compatible = "mediatek,mt8173-smi-common";
179            reg = <0x14022000 0x1000>;
180            power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
181            clocks = <&mmsys CLK_MM_SMI_COMMON>,
182                     <&mmsys CLK_MM_SMI_COMMON>;
183            clock-names = "apb", "smi";
184    };
185