xref: /linux/Documentation/devicetree/bindings/display/mediatek/mediatek,padding.yaml (revision d2423d8a38e724b28007abd76db08ccb59f56015) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/display/mediatek/mediatek,padding.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: MediaTek Display Padding
8
9maintainers:
10  - Chun-Kuang Hu <chunkuang.hu@kernel.org>
11  - Philipp Zabel <p.zabel@pengutronix.de>
12
13description:
14  Padding provides ability to add pixels to width and height of a layer with
15  specified colors. Due to hardware design, Mixer in VDOSYS1 requires
16  width of a layer to be 2-pixel-align, or 4-pixel-align when ETHDR is enabled,
17  we need Padding to deal with odd width.
18  Please notice that even if the Padding is in bypass mode, settings in
19  register must be cleared to 0, or undefined behaviors could happen.
20
21properties:
22  compatible:
23    const: mediatek,mt8188-disp-padding
24
25  reg:
26    maxItems: 1
27
28  power-domains:
29    maxItems: 1
30
31  clocks:
32    items:
33      - description: Padding's clocks
34
35  mediatek,gce-client-reg:
36    description:
37      GCE (Global Command Engine) is a multi-core micro processor that helps
38      its clients to execute commands without interrupting CPU. This property
39      describes GCE client's information that is composed by 4 fields.
40      1. Phandle of the GCE (there may be several GCE processors)
41      2. Sub-system ID defined in the dt-binding like a user ID
42         (Please refer to include/dt-bindings/gce/<chip>-gce.h)
43      3. Offset from base address of the subsys you are at
44      4. Size of the register the client needs
45    $ref: /schemas/types.yaml#/definitions/phandle-array
46    items:
47      items:
48        - description: Phandle of the GCE
49        - description: Subsys ID defined in the dt-binding
50        - description: Offset from base address of the subsys
51        - description: Size of register
52    maxItems: 1
53
54required:
55  - compatible
56  - reg
57  - power-domains
58  - clocks
59  - mediatek,gce-client-reg
60
61additionalProperties: false
62
63examples:
64  - |
65    #include <dt-bindings/interrupt-controller/arm-gic.h>
66    #include <dt-bindings/clock/mediatek,mt8188-clk.h>
67    #include <dt-bindings/power/mediatek,mt8188-power.h>
68    #include <dt-bindings/gce/mt8195-gce.h>
69
70    soc {
71        #address-cells = <2>;
72        #size-cells = <2>;
73
74        padding0: padding@1c11d000 {
75            compatible = "mediatek,mt8188-disp-padding";
76            reg = <0 0x1c11d000 0 0x1000>;
77            clocks = <&vdosys1 CLK_VDO1_PADDING0>;
78            power-domains = <&spm MT8188_POWER_DOMAIN_VDOSYS1>;
79            mediatek,gce-client-reg = <&gce0 SUBSYS_1c11XXXX 0xd000 0x1000>;
80        };
81    };
82