xref: /linux/Documentation/devicetree/bindings/display/arm,pl11x.yaml (revision 4f2c0a4acffbec01079c28f839422e64ddeff004) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/display/arm,pl11x.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Arm PrimeCell Color LCD Controller PL110/PL111
8
9maintainers:
10  - Liviu Dudau <Liviu.Dudau@arm.com>
11  - Andre Przywara <andre.przywara@arm.com>
12
13description:
14  The Arm Primcell PL010/PL111 is an LCD controller IP, than scans out
15  a framebuffer region in system memory, and creates timed signals for
16  a variety of LCD panels.
17
18# We need a select here so we don't match all nodes with 'arm,primecell'
19select:
20  properties:
21    compatible:
22      contains:
23        enum:
24          - arm,pl110
25          - arm,pl111
26  required:
27    - compatible
28
29properties:
30  compatible:
31    items:
32      - enum:
33          - arm,pl110
34          - arm,pl111
35      - const: arm,primecell
36
37  reg:
38    maxItems: 1
39
40  interrupt-names:
41    oneOf:
42      - const: combined
43        description:
44          The IP provides four individual interrupt lines, but also one
45          combined line. If the integration only connects this line to the
46          interrupt controller, this single interrupt is noted here.
47      - items:
48          - const: mbe        # CLCDMBEINTR
49          - const: vcomp      # CLCDVCOMPINTR
50          - const: lnbu       # CLCDLNBUINTR
51          - const: fuf        # CLCDFUFINTR
52
53  interrupts:
54    minItems: 1
55    maxItems: 4
56
57  clock-names:
58    items:
59      - const: clcdclk
60      - const: apb_pclk
61
62  clocks:
63    items:
64      - description: The CLCDCLK reference clock for the controller.
65      - description: The HCLK AHB slave clock for the register access.
66
67  memory-region:
68    maxItems: 1
69    description:
70      Phandle to a node describing memory to be used for the framebuffer.
71      If not present, the framebuffer may be located anywhere in memory.
72
73  max-memory-bandwidth:
74    $ref: /schemas/types.yaml#/definitions/uint32
75    description:
76      Maximum bandwidth in bytes per second that the cell's memory interface
77      can handle.
78      If not present, the memory interface is fast enough to handle all
79      possible video modes.
80
81  port:
82    $ref: /schemas/graph.yaml#/$defs/port-base
83    additionalProperties: false
84
85    description:
86      Output endpoint of the controller, connecting the LCD panel signals.
87
88    properties:
89      endpoint:
90        $ref: /schemas/graph.yaml#/$defs/endpoint-base
91        unevaluatedProperties: false
92
93        properties:
94          arm,pl11x,tft-r0g0b0-pads:
95            $ref: /schemas/types.yaml#/definitions/uint32-array
96            items:
97              - description: index of CLD pad used for first red bit (R0)
98              - description: index of CLD pad used for first green bit (G0)
99              - description: index of CLD pad used for first blue bit (G0)
100            deprecated: true
101            description: |
102              DEPRECATED. An array of three 32-bit values, defining the way
103              CLD[23:0] pads are wired up.
104              The first value contains the index of the "CLD" external pin (pad)
105              used as R0 (first bit of the red component), the second value for
106              green, the third value for blue.
107              See also "LCD panel signal multiplexing details" paragraphs in the
108              PL110/PL111 Technical Reference Manuals.
109              This implicitly defines available color modes, for example:
110              - PL111 TFT 4:4:4 panel:
111                  arm,pl11x,tft-r0g0b0-pads = <4 15 20>;
112              - PL110 TFT (1:)5:5:5 panel:
113                  arm,pl11x,tft-r0g0b0-pads = <1 7 13>;
114              - PL111 TFT (1:)5:5:5 panel:
115                  arm,pl11x,tft-r0g0b0-pads = <3 11 19>;
116              - PL111 TFT 5:6:5 panel:
117                  arm,pl11x,tft-r0g0b0-pads = <3 10 19>;
118              - PL110 and PL111 TFT 8:8:8 panel:
119                  arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
120              - PL110 and PL111 TFT 8:8:8 panel, R & B components swapped:
121                  arm,pl11x,tft-r0g0b0-pads = <16 8 0>;
122
123additionalProperties: false
124
125required:
126  - compatible
127  - reg
128  - clock-names
129  - clocks
130  - port
131
132allOf:
133  - if:
134      properties:
135        interrupts:
136          minItems: 2
137      required:
138        - interrupts
139    then:
140      required:
141        - interrupt-names
142
143examples:
144  - |
145    clcd@10020000 {
146        compatible = "arm,pl111", "arm,primecell";
147        reg = <0x10020000 0x1000>;
148        interrupt-names = "combined";
149        interrupts = <44>;
150        clocks = <&oscclk1>, <&oscclk2>;
151        clock-names = "clcdclk", "apb_pclk";
152        max-memory-bandwidth = <94371840>; /* Bps, 1024x768@60 16bpp */
153
154        port {
155            clcd_pads: endpoint {
156                remote-endpoint = <&clcd_panel>;
157            };
158        };
159    };
160
161    panel {
162        compatible = "arm,rtsm-display";
163
164        port {
165            clcd_panel: endpoint {
166                remote-endpoint = <&clcd_pads>;
167            };
168        };
169    };
170...
171