xref: /linux/Documentation/devicetree/bindings/display/mediatek/mediatek,gamma.yaml (revision fbf5df34a4dbcd09d433dd4f0916bf9b2ddb16de) 
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              - mediatek,mt8167-disp-gamma
32          - const: mediatek,mt8173-disp-gamma
33      - items:
34          - enum:
35              - mediatek,mt8186-disp-gamma
36              - mediatek,mt8188-disp-gamma
37              - mediatek,mt8192-disp-gamma
38              - mediatek,mt8195-disp-gamma
39              - mediatek,mt8365-disp-gamma
40          - const: mediatek,mt8183-disp-gamma
41      - items:
42          - enum:
43              - mediatek,mt8188-disp-gamma
44          - const: mediatek,mt8195-disp-gamma
45
46  reg:
47    maxItems: 1
48
49  interrupts:
50    maxItems: 1
51
52  power-domains:
53    description: A phandle and PM domain specifier as defined by bindings of
54      the power controller specified by phandle. See
55      Documentation/devicetree/bindings/power/power-domain.yaml for details.
56
57  clocks:
58    items:
59      - description: GAMMA Clock
60
61  mediatek,gce-client-reg:
62    description: The register of client driver can be configured by gce with
63      4 arguments defined in this property, such as phandle of gce, subsys id,
64      register offset and size. Each GCE subsys id is mapping to a client
65      defined in the header include/dt-bindings/gce/<chip>-gce.h.
66    $ref: /schemas/types.yaml#/definitions/phandle-array
67    maxItems: 1
68
69  ports:
70    $ref: /schemas/graph.yaml#/properties/ports
71
72    properties:
73      port@0:
74        $ref: /schemas/graph.yaml#/properties/port
75        description: GAMMA input, usually from one of the AAL blocks.
76
77      port@1:
78        $ref: /schemas/graph.yaml#/properties/port
79        description:
80          GAMMA output to the input of the next desired component in the
81          display pipeline, for example one of the available DITHER or
82          POSTMASK blocks.
83
84    required:
85      - port@0
86      - port@1
87
88required:
89  - compatible
90  - reg
91  - interrupts
92  - power-domains
93  - clocks
94
95additionalProperties: false
96
97examples:
98  - |
99    #include <dt-bindings/interrupt-controller/arm-gic.h>
100    #include <dt-bindings/clock/mt8173-clk.h>
101    #include <dt-bindings/power/mt8173-power.h>
102    #include <dt-bindings/gce/mt8173-gce.h>
103
104    soc {
105        #address-cells = <2>;
106        #size-cells = <2>;
107
108        gamma@14016000 {
109            compatible = "mediatek,mt8173-disp-gamma";
110            reg = <0 0x14016000 0 0x1000>;
111            interrupts = <GIC_SPI 190 IRQ_TYPE_LEVEL_LOW>;
112            power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
113            clocks = <&mmsys CLK_MM_DISP_GAMMA>;
114            mediatek,gce-client-reg = <&gce SUBSYS_1401XXXX 0x6000 0x1000>;
115        };
116    };
117