xref: /linux/Documentation/devicetree/bindings/display/mediatek/mediatek,gamma.yaml (revision 7f71507851fc7764b36a3221839607d3a45c2025) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/display/mediatek/mediatek,gamma.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Mediatek display gamma correction
8
9maintainers:
10  - Chun-Kuang Hu <chunkuang.hu@kernel.org>
11  - Philipp Zabel <p.zabel@pengutronix.de>
12
13description: |
14  Mediatek display gamma correction, namely GAMMA, provides a nonlinear
15  operation used to adjust luminance in display system.
16  GAMMA device node must be siblings to the central MMSYS_CONFIG node.
17  For a description of the MMSYS_CONFIG binding, see
18  Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
19  for details.
20
21properties:
22  compatible:
23    oneOf:
24      - enum:
25          - mediatek,mt8173-disp-gamma
26          - mediatek,mt8183-disp-gamma
27          - mediatek,mt8195-disp-gamma
28      - items:
29          - enum:
30              - mediatek,mt6795-disp-gamma
31          - const: mediatek,mt8173-disp-gamma
32      - items:
33          - enum:
34              - mediatek,mt8186-disp-gamma
35              - mediatek,mt8188-disp-gamma
36              - mediatek,mt8192-disp-gamma
37              - mediatek,mt8195-disp-gamma
38              - mediatek,mt8365-disp-gamma
39          - const: mediatek,mt8183-disp-gamma
40      - items:
41          - enum:
42              - mediatek,mt8188-disp-gamma
43          - const: mediatek,mt8195-disp-gamma
44
45  reg:
46    maxItems: 1
47
48  interrupts:
49    maxItems: 1
50
51  power-domains:
52    description: A phandle and PM domain specifier as defined by bindings of
53      the power controller specified by phandle. See
54      Documentation/devicetree/bindings/power/power-domain.yaml for details.
55
56  clocks:
57    items:
58      - description: GAMMA Clock
59
60  mediatek,gce-client-reg:
61    description: The register of client driver can be configured by gce with
62      4 arguments defined in this property, such as phandle of gce, subsys id,
63      register offset and size. Each GCE subsys id is mapping to a client
64      defined in the header include/dt-bindings/gce/<chip>-gce.h.
65    $ref: /schemas/types.yaml#/definitions/phandle-array
66    maxItems: 1
67
68  ports:
69    $ref: /schemas/graph.yaml#/properties/ports
70
71    properties:
72      port@0:
73        $ref: /schemas/graph.yaml#/properties/port
74        description: GAMMA input, usually from one of the AAL blocks.
75
76      port@1:
77        $ref: /schemas/graph.yaml#/properties/port
78        description:
79          GAMMA output to the input of the next desired component in the
80          display pipeline, for example one of the available DITHER or
81          POSTMASK blocks.
82
83    required:
84      - port@0
85      - port@1
86
87required:
88  - compatible
89  - reg
90  - interrupts
91  - power-domains
92  - clocks
93
94additionalProperties: false
95
96examples:
97  - |
98    #include <dt-bindings/interrupt-controller/arm-gic.h>
99    #include <dt-bindings/clock/mt8173-clk.h>
100    #include <dt-bindings/power/mt8173-power.h>
101    #include <dt-bindings/gce/mt8173-gce.h>
102
103    soc {
104        #address-cells = <2>;
105        #size-cells = <2>;
106
107        gamma@14016000 {
108            compatible = "mediatek,mt8173-disp-gamma";
109            reg = <0 0x14016000 0 0x1000>;
110            interrupts = <GIC_SPI 190 IRQ_TYPE_LEVEL_LOW>;
111            power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
112            clocks = <&mmsys CLK_MM_DISP_GAMMA>;
113            mediatek,gce-client-reg = <&gce SUBSYS_1401XXXX 0x6000 0x1000>;
114        };
115    };
116