1 # SPDX-License-Identifier: (GPL-2.0-only OR BS !! 1 # SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/display/pan 4 $id: http://devicetree.org/schemas/display/panel/panel-mipi-dbi-spi.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: MIPI DBI SPI Panel 7 title: MIPI DBI SPI Panel
8 8
9 maintainers: 9 maintainers:
10 - Noralf Trønnes <noralf@tronnes.org> 10 - Noralf Trønnes <noralf@tronnes.org>
11 11
12 description: | 12 description: |
13 This binding is for display panels using a M 13 This binding is for display panels using a MIPI DBI compatible controller
14 in SPI mode. 14 in SPI mode.
15 15
16 The MIPI Alliance Standard for Display Bus I 16 The MIPI Alliance Standard for Display Bus Interface defines the electrical
17 and logical interfaces for display controlle 17 and logical interfaces for display controllers historically used in mobile
18 phones. The standard defines 4 display archi 18 phones. The standard defines 4 display architecture types and this binding is
19 for type 1 which has full frame memory. Ther 19 for type 1 which has full frame memory. There are 3 interface types in the
20 standard and type C is the serial interface. 20 standard and type C is the serial interface.
21 21
22 The standard defines the following interface 22 The standard defines the following interface signals for type C:
23 - Power: 23 - Power:
24 - Vdd: Power supply for display module 24 - Vdd: Power supply for display module
25 Called power-supply in this binding. 25 Called power-supply in this binding.
26 - Vddi: Logic level supply for interface s 26 - Vddi: Logic level supply for interface signals
27 Called io-supply in this binding. 27 Called io-supply in this binding.
28 - Interface: 28 - Interface:
29 - CSx: Chip select 29 - CSx: Chip select
30 - SCL: Serial clock 30 - SCL: Serial clock
31 - Dout: Serial out 31 - Dout: Serial out
32 - Din: Serial in 32 - Din: Serial in
33 - SDA: Bidrectional in/out 33 - SDA: Bidrectional in/out
34 - D/CX: Data/command selection, high=data, 34 - D/CX: Data/command selection, high=data, low=command
35 Called dc-gpios in this binding. 35 Called dc-gpios in this binding.
36 - RESX: Reset when low 36 - RESX: Reset when low
37 Called reset-gpios in this binding. 37 Called reset-gpios in this binding.
38 38
39 The type C interface has 3 options: 39 The type C interface has 3 options:
40 40
41 - Option 1: 9-bit mode and D/CX as the 9th 41 - Option 1: 9-bit mode and D/CX as the 9th bit
42 | Command | t 42 | Command | the next command or following data |
43 |<0><D7><D6><D5><D4><D3><D2><D1><D0>|<D/ 43 |<0><D7><D6><D5><D4><D3><D2><D1><D0>|<D/CX><D7><D6><D5><D4><D3><D2><D1><D0>|
44 44
45 - Option 2: 16-bit mode and D/CX as a 9th 45 - Option 2: 16-bit mode and D/CX as a 9th bit
46 | Command or data 46 | Command or data |
47 |<X><X><X><X><X><X><X><D/CX><D7><D6><D5> 47 |<X><X><X><X><X><X><X><D/CX><D7><D6><D5><D4><D3><D2><D1><D0>|
48 48
49 - Option 3: 8-bit mode and D/CX as a separ 49 - Option 3: 8-bit mode and D/CX as a separate interface line
50 | Command or data | 50 | Command or data |
51 |<D7><D6><D5><D4><D3><D2><D1><D0>| 51 |<D7><D6><D5><D4><D3><D2><D1><D0>|
52 52
53 The standard defines one pixel format for ty <<
54 however has decided to provide the type A/B <<
55 the Type C interface and most common among t <<
56 The MIPI DCS command set_address_mode (36h) <<
57 order. This gives each supported RGB format <<
58 <<
59 The panel resolution is specified using the 53 The panel resolution is specified using the panel-timing node properties
60 hactive (width) and vactive (height). The ot 54 hactive (width) and vactive (height). The other mandatory panel-timing
61 properties should be set to zero except cloc 55 properties should be set to zero except clock-frequency which can be
62 optionally set to inform about the actual pi 56 optionally set to inform about the actual pixel clock frequency.
63 57
64 If the panel is wired to the controller at a 58 If the panel is wired to the controller at an offset specify this using
65 hback-porch (x-offset) and vback-porch (y-of 59 hback-porch (x-offset) and vback-porch (y-offset).
66 60
67 allOf: 61 allOf:
68 - $ref: panel-common.yaml# 62 - $ref: panel-common.yaml#
69 - $ref: /schemas/spi/spi-peripheral-props.ya 63 - $ref: /schemas/spi/spi-peripheral-props.yaml#
70 64
71 properties: 65 properties:
72 compatible: 66 compatible:
73 items: 67 items:
74 - enum: 68 - enum:
75 - saef,sftc154b <<
76 - sainsmart18 69 - sainsmart18
77 - shineworld,lh133k 70 - shineworld,lh133k
78 - const: panel-mipi-dbi-spi 71 - const: panel-mipi-dbi-spi
79 72
80 reg: <<
81 maxItems: 1 <<
82 <<
83 write-only: 73 write-only:
84 type: boolean 74 type: boolean
85 description: 75 description:
86 Controller is not readable (ie. Din (MIS 76 Controller is not readable (ie. Din (MISO on the SPI interface) is not
87 wired up). 77 wired up).
88 78
89 dc-gpios: 79 dc-gpios:
90 maxItems: 1 80 maxItems: 1
91 description: | 81 description: |
92 Controller data/command selection (D/CX) 82 Controller data/command selection (D/CX) in 4-line SPI mode.
93 If not set, the controller is in 3-line 83 If not set, the controller is in 3-line SPI mode.
94 84
95 io-supply: 85 io-supply:
96 description: | 86 description: |
97 Logic level supply for interface signals 87 Logic level supply for interface signals (Vddi).
98 No need to set if this is the same as po 88 No need to set if this is the same as power-supply.
99 89
100 spi-3wire: true 90 spi-3wire: true
101 91
102 format: <<
103 description: > <<
104 Pixel format in bit order as going on th <<
105 * `x2r1g1b1r1g1b1` - RGB111, 2 pixels <<
106 * `x2b1g1r1b1g1r1` - BGR111, 2 pixels <<
107 * `x1r1g1b1x1r1g1b1` - RGB111, 2 pixel <<
108 * `x1b1g1r1x1b1g1r1` - BGR111, 2 pixel <<
109 * `r5g6b5` - RGB565, 2 bytes <<
110 * `b5g6r5` - BGR565, 2 bytes <<
111 * `r6x2g6x2b6x2` - RGB666, 3 bytes <<
112 * `b6x2g6x2r6x2` - BGR666, 3 bytes <<
113 enum: <<
114 - x2r1g1b1r1g1b1 <<
115 - x2b1g1r1b1g1r1 <<
116 - x1r1g1b1x1r1g1b1 <<
117 - x1b1g1r1x1b1g1r1 <<
118 - r5g6b5 <<
119 - b5g6r5 <<
120 - r6x2g6x2b6x2 <<
121 - b6x2g6x2r6x2 <<
122 default: r5g6b5 <<
123 <<
124 required: 92 required:
125 - compatible 93 - compatible
126 - reg 94 - reg
127 - width-mm 95 - width-mm
128 - height-mm 96 - height-mm
129 - panel-timing 97 - panel-timing
130 98
131 unevaluatedProperties: false 99 unevaluatedProperties: false
132 100
133 examples: 101 examples:
134 - | 102 - |
135 #include <dt-bindings/gpio/gpio.h> 103 #include <dt-bindings/gpio/gpio.h>
136 104
137 spi { 105 spi {
138 #address-cells = <1>; 106 #address-cells = <1>;
139 #size-cells = <0>; 107 #size-cells = <0>;
140 108
141 display@0{ 109 display@0{
142 compatible = "sainsmart18", "panel 110 compatible = "sainsmart18", "panel-mipi-dbi-spi";
143 reg = <0>; 111 reg = <0>;
144 spi-max-frequency = <40000000>; 112 spi-max-frequency = <40000000>;
145 113
146 dc-gpios = <&gpio 24 GPIO_ACTIVE_H 114 dc-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
147 reset-gpios = <&gpio 25 GPIO_ACTIV 115 reset-gpios = <&gpio 25 GPIO_ACTIVE_HIGH>;
148 write-only; 116 write-only;
149 <<
150 format = "r5g6b5"; <<
151 117
152 backlight = <&backlight>; 118 backlight = <&backlight>;
153 119
154 width-mm = <35>; 120 width-mm = <35>;
155 height-mm = <28>; 121 height-mm = <28>;
156 122
157 panel-timing { 123 panel-timing {
158 hactive = <160>; 124 hactive = <160>;
159 vactive = <128>; 125 vactive = <128>;
160 hback-porch = <0>; 126 hback-porch = <0>;
161 vback-porch = <0>; 127 vback-porch = <0>;
162 clock-frequency = <0>; 128 clock-frequency = <0>;
163 hfront-porch = <0>; 129 hfront-porch = <0>;
164 hsync-len = <0>; 130 hsync-len = <0>;
165 vfront-porch = <0>; 131 vfront-porch = <0>;
166 vsync-len = <0>; 132 vsync-len = <0>;
167 }; 133 };
168 }; 134 };
169 }; 135 };
170 136
171 ... 137 ...
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