| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | Atmel LCDC Framebuffer |
| 2 | ----------------------------------------------------- |
| 3 | |
| 4 | Required properties: |
| 5 | - compatible : |
| 6 | "atmel,at91sam9261-lcdc" , |
| 7 | "atmel,at91sam9263-lcdc" , |
| 8 | "atmel,at91sam9g10-lcdc" , |
| 9 | "atmel,at91sam9g45-lcdc" , |
| 10 | "atmel,at91sam9g45es-lcdc" , |
| 11 | "atmel,at91sam9rl-lcdc" , |
| 12 | - reg : Should contain 1 register ranges(address and length). |
| 13 | Can contain an additional register range(address and length) |
| 14 | for fixed framebuffer memory. Useful for dedicated memories. |
| 15 | - interrupts : framebuffer controller interrupt |
| 16 | - display: a phandle pointing to the display node |
| 17 | |
| 18 | Required nodes: |
| 19 | - display: a display node is required to initialize the lcd panel |
| 20 | This should be in the board dts. |
| 21 | - default-mode: a videomode within the display with timing parameters |
| 22 | as specified below. |
| 23 | |
| 24 | Optional properties: |
| 25 | - lcd-supply: Regulator for LCD supply voltage. |
| 26 | |
| 27 | Example: |
| 28 | |
| 29 | fb0: fb@00500000 { |
| 30 | compatible = "atmel,at91sam9g45-lcdc"; |
| 31 | reg = <0x00500000 0x1000>; |
| 32 | interrupts = <23 3 0>; |
| 33 | pinctrl-names = "default"; |
| 34 | pinctrl-0 = <&pinctrl_fb>; |
| 35 | display = <&display0>; |
| 36 | #address-cells = <1>; |
| 37 | #size-cells = <1>; |
| 38 | |
| 39 | }; |
| 40 | |
| 41 | Example for fixed framebuffer memory: |
| 42 | |
| 43 | fb0: fb@00500000 { |
| 44 | compatible = "atmel,at91sam9263-lcdc"; |
| 45 | reg = <0x00700000 0x1000 0x70000000 0x200000>; |
| 46 | [...] |
| 47 | }; |
| 48 | |
| 49 | Atmel LCDC Display |
| 50 | ----------------------------------------------------- |
| 51 | Required properties (as per of_videomode_helper): |
| 52 | |
| 53 | - atmel,dmacon: dma controller configuration |
| 54 | - atmel,lcdcon2: lcd controller configuration |
| 55 | - atmel,guard-time: lcd guard time (Delay in frame periods) |
| 56 | - bits-per-pixel: lcd panel bit-depth. |
| 57 | |
| 58 | Optional properties (as per of_videomode_helper): |
| 59 | - atmel,lcdcon-backlight: enable backlight |
| 60 | - atmel,lcdcon-backlight-inverted: invert backlight PWM polarity |
| 61 | - atmel,lcd-wiring-mode: lcd wiring mode "RGB" or "BRG" |
| 62 | - atmel,power-control-gpio: gpio to power on or off the LCD (as many as needed) |
| 63 | |
| 64 | Example: |
| 65 | display0: display { |
| 66 | bits-per-pixel = <32>; |
| 67 | atmel,lcdcon-backlight; |
| 68 | atmel,dmacon = <0x1>; |
| 69 | atmel,lcdcon2 = <0x80008002>; |
| 70 | atmel,guard-time = <9>; |
| 71 | atmel,lcd-wiring-mode = <1>; |
| 72 | |
| 73 | display-timings { |
| 74 | native-mode = <&timing0>; |
| 75 | timing0: timing0 { |
| 76 | clock-frequency = <9000000>; |
| 77 | hactive = <480>; |
| 78 | vactive = <272>; |
| 79 | hback-porch = <1>; |
| 80 | hfront-porch = <1>; |
| 81 | vback-porch = <40>; |
| 82 | vfront-porch = <1>; |
| 83 | hsync-len = <45>; |
| 84 | vsync-len = <1>; |
| 85 | }; |
| 86 | }; |
| 87 | }; |