| Tom Rini | 762f85b | 2024-07-20 11:15:10 -0600 | [diff] [blame] | 1 | # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/display/atmel,lcdc-display.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: Microchip's LCDC Display |
| 8 | |
| 9 | maintainers: |
| 10 | - Nicolas Ferre <nicolas.ferre@microchip.com> |
| 11 | - Dharma Balasubiramani <dharma.b@microchip.com> |
| 12 | |
| 13 | description: |
| 14 | The LCD Controller (LCDC) consists of logic for transferring LCD image data |
| 15 | from an external display buffer to a TFT LCD panel. The LCDC has one display |
| 16 | input buffer per layer that fetches pixels through the single bus host |
| 17 | interface and a look-up table to allow palletized display configurations. The |
| 18 | LCDC is programmable on a per layer basis, and supports different LCD |
| 19 | resolutions, window sizes, image formats and pixel depths. |
| 20 | |
| 21 | # We need a select here since this schema is applicable only for nodes with the |
| 22 | # following properties |
| 23 | |
| 24 | select: |
| 25 | anyOf: |
| 26 | - required: [ 'atmel,dmacon' ] |
| 27 | - required: [ 'atmel,lcdcon2' ] |
| 28 | - required: [ 'atmel,guard-time' ] |
| 29 | |
| 30 | properties: |
| 31 | atmel,dmacon: |
| 32 | $ref: /schemas/types.yaml#/definitions/uint32 |
| 33 | description: dma controller configuration |
| 34 | |
| 35 | atmel,lcdcon2: |
| 36 | $ref: /schemas/types.yaml#/definitions/uint32 |
| 37 | description: lcd controller configuration |
| 38 | |
| 39 | atmel,guard-time: |
| 40 | $ref: /schemas/types.yaml#/definitions/uint32 |
| 41 | description: lcd guard time (Delay in frame periods) |
| 42 | maximum: 127 |
| 43 | |
| 44 | bits-per-pixel: |
| 45 | $ref: /schemas/types.yaml#/definitions/uint32 |
| 46 | description: lcd panel bit-depth. |
| 47 | enum: [1, 2, 4, 8, 16, 24, 32] |
| 48 | |
| 49 | atmel,lcdcon-backlight: |
| 50 | $ref: /schemas/types.yaml#/definitions/flag |
| 51 | description: enable backlight |
| 52 | |
| 53 | atmel,lcdcon-backlight-inverted: |
| 54 | $ref: /schemas/types.yaml#/definitions/flag |
| 55 | description: invert backlight PWM polarity |
| 56 | |
| 57 | atmel,lcd-wiring-mode: |
| 58 | $ref: /schemas/types.yaml#/definitions/string |
| 59 | description: lcd wiring mode "RGB" or "BRG" |
| 60 | enum: |
| 61 | - RGB |
| 62 | - BRG |
| 63 | |
| 64 | atmel,power-control-gpio: |
| 65 | description: gpio to power on or off the LCD (as many as needed) |
| 66 | maxItems: 1 |
| 67 | |
| 68 | display-timings: |
| 69 | $ref: panel/display-timings.yaml# |
| 70 | |
| 71 | required: |
| 72 | - atmel,dmacon |
| 73 | - atmel,lcdcon2 |
| 74 | - atmel,guard-time |
| 75 | - bits-per-pixel |
| 76 | |
| 77 | additionalProperties: false |
| 78 | |
| 79 | examples: |
| 80 | - | |
| 81 | display: panel { |
| 82 | bits-per-pixel = <32>; |
| 83 | atmel,lcdcon-backlight; |
| 84 | atmel,dmacon = <0x1>; |
| 85 | atmel,lcdcon2 = <0x80008002>; |
| 86 | atmel,guard-time = <9>; |
| 87 | atmel,lcd-wiring-mode = "RGB"; |
| 88 | |
| 89 | display-timings { |
| 90 | native-mode = <&timing0>; |
| 91 | timing0: timing0 { |
| 92 | clock-frequency = <9000000>; |
| 93 | hactive = <480>; |
| 94 | vactive = <272>; |
| 95 | hback-porch = <1>; |
| 96 | hfront-porch = <1>; |
| 97 | vback-porch = <40>; |
| 98 | vfront-porch = <1>; |
| 99 | hsync-len = <45>; |
| 100 | vsync-len = <1>; |
| 101 | }; |
| 102 | }; |
| 103 | }; |