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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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title: Simple Framebuffer
maintainers: - Hans de Goede <hdegoede@redhat.com>
description: |+ A simple frame-buffer describes a frame-buffer setup by firmware or the bootloader, with the assumption that the display hardware has already been set up to scan out from the memory pointed to by the reg property.
Since simplefb nodes represent runtime information they must be sub-nodes of the chosen node (*). Simplefb nodes must be named framebuffer@<address>.
If the devicetree contains nodes for the display hardware used by a simplefb, then the simplefb node must contain a property called display, which contains a phandle pointing to the primary display hw node, so that the OS knows which simplefb to disable when handing over control to a driver for the real hardware. The bindings for the hw nodes must specify which node is considered the primary node.
If a panel node is given, then the driver uses this to configure the physical width and height of the display. If no panel node is given, then the driver uses the width and height properties of the simplefb node to estimate it.
It is advised to add display# aliases to help the OS determine how to number things. If display# aliases are used, then if the simplefb node contains a display property then the /aliases/display# path must point to the display hw node the display property points to, otherwise it must point directly to the simplefb node.
If a simplefb node represents the preferred console for user interaction, then the chosen node stdout-path property should point to it, or to the primary display hw node, as with display# aliases. If display aliases are used then it should be set to the alias instead.
It is advised that devicetree files contain pre-filled, disabled framebuffer nodes, so that the firmware only needs to update the mode information and enable them. This way if e.g. later on support for more display clocks get added, the simplefb nodes will already contain this info and the firmware does not need to be updated.
If pre-filled framebuffer nodes are used, the firmware may need extra information to find the right node. In that case an extra platform specific compatible and platform specific properties should be used and documented.
properties: compatible: oneOf: - items: - enum: - apple,simple-framebuffer - allwinner,simple-framebuffer - amlogic,simple-framebuffer - const: simple-framebuffer - const: simple-framebuffer
reg: description: Location and size of the framebuffer memory
memory-region: maxItems: 1 description: Phandle to a node describing the memory to be used for the framebuffer. If present, overrides the "reg" property (if one exists).
clocks: description: List of clocks used by the framebuffer.
power-domains: description: List of power domains used by the framebuffer.
width: $ref: /schemas/types.yaml#/definitions/uint32 description: Width of the framebuffer in pixels
height: $ref: /schemas/types.yaml#/definitions/uint32 description: Height of the framebuffer in pixels
stride: $ref: /schemas/types.yaml#/definitions/uint32 description: Number of bytes of a line in the framebuffer
format: description: > Format of the framebuffer: * `a1r5g5b5` - 16-bit pixels, d[15]=a, d[14:10]=r, d[9:5]=g, d[4:0]=b * `a2r10g10b10` - 32-bit pixels, d[31:30]=a, d[29:20]=r, d[19:10]=g, d[9:0]=b * `a8b8g8r8` - 32-bit pixels, d[31:24]=a, d[23:16]=b, d[15:8]=g, d[7:0]=r * `a8r8g8b8` - 32-bit pixels, d[31:24]=a, d[23:16]=r, d[15:8]=g, d[7:0]=b * `r5g6b5` - 16-bit pixels, d[15:11]=r, d[10:5]=g, d[4:0]=b * `r5g5b5a1` - 16-bit pixels, d[15:11]=r, d[10:6]=g, d[5:1]=b d[1:0]=a * `r8g8b8` - 24-bit pixels, d[23:16]=r, d[15:8]=g, d[7:0]=b * `x1r5g5b5` - 16-bit pixels, d[14:10]=r, d[9:5]=g, d[4:0]=b * `x2r10g10b10` - 32-bit pixels, d[29:20]=r, d[19:10]=g, d[9:0]=b * `x8r8g8b8` - 32-bit pixels, d[23:16]=r, d[15:8]=g, d[7:0]=b * `x8b8g8r8` - 32-bit pixels, d[23:16]=b, d[15:8]=g, d[7:0]=r enum: - a1r5g5b5 - a2r10g10b10 - a8b8g8r8 - a8r8g8b8 - r5g6b5 - r5g5b5a1 - r8g8b8 - x1r5g5b5 - x2r10g10b10 - x8r8g8b8 - x8b8g8r8
display: $ref: /schemas/types.yaml#/definitions/phandle description: Primary display hardware node
panel: $ref: /schemas/types.yaml#/definitions/phandle description: Display panel node
allwinner,pipeline: description: Pipeline used by the framebuffer on Allwinner SoCs enum: - de_be0-lcd0 - de_be0-lcd0-hdmi - de_be0-lcd0-tve0 - de_be1-lcd0 - de_be1-lcd1-hdmi - de_fe0-de_be0-lcd0 - de_fe0-de_be0-lcd0-hdmi - de_fe0-de_be0-lcd0-tve0 - mixer0-lcd0 - mixer0-lcd0-hdmi - mixer1-lcd1-hdmi - mixer1-lcd1-tve
amlogic,pipeline: description: Pipeline used by the framebuffer on Amlogic SoCs enum: - vpu-cvbs - vpu-hdmi
patternProperties: "^[a-zA-Z0-9-]+-supply$": $ref: /schemas/types.yaml#/definitions/phandle description: Regulators used by the framebuffer. These should be named according to the names in the device design.
required: # The binding requires also reg, width, height, stride and format, # but usually they will be filled by the bootloader. - compatible
allOf: - if: properties: compatible: contains: const: allwinner,simple-framebuffer
then: required: - allwinner,pipeline
- if: properties: compatible: contains: const: amlogic,simple-framebuffer
then: required: - amlogic,pipeline
additionalProperties: false
examples: - | / { compatible = "foo"; model = "foo"; #address-cells = <1>; #size-cells = <1>;
chosen { #address-cells = <1>; #size-cells = <1>; framebuffer0: framebuffer@1d385000 { compatible = "allwinner,simple-framebuffer", "simple-framebuffer"; allwinner,pipeline = "de_be0-lcd0"; reg = <0x1d385000 3840000>; width = <1600>; height = <1200>; stride = <3200>; format = "r5g6b5"; clocks = <&ahb_gates 36>, <&ahb_gates 43>, <&ahb_gates 44>; lcd-supply = <®_dc1sw>; display = <&lcdc0>; }; }; };
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