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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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1c0ff333f2
Freescale i.MX8qxp Display Controller is implemented as construction set of building blocks with unified concept and standardized interfaces. Document all existing processing units. Signed-off-by: Liu Ying <victor.liu@nxp.com> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Link: https://lore.kernel.org/r/20250414035028.1561475-2-victor.liu@nxp.com
84 lines
2.5 KiB
YAML
84 lines
2.5 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/display/imx/fsl,imx8qxp-dc-scaling-engine.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Freescale i.MX8qxp Display Controller Scaling Engine
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description: |
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The unit can change the dimension of the input frame by nearest or linear
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re-sampling with 1/32 sub pixel precision.
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Internally it consist of two independent blocks for horizontal and vertical
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scaling. The sequence of both operations is arbitrary.
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Any frame dimensions between 1 and 16384 pixels in width and height are
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supported, except that the vertical scaler has a frame width maximum
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depending of the system's functional limitations.
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In general all scale factors are supported inside the supported frame
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dimensions. In range of scale factors 1/16..16 the filtered output colors
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are LSBit precise (e.g. DC ripple free).
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+-----------+
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| Line |
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| Buffer |
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+-----------+
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^
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V
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|\ +-----------+
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------+ | | |
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| | +-->| Vertical |----
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| ----+ | | Scaler | |
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| | |/ +-----------+ |
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| | |
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| | |
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| ------------- -------------+-----+ |
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Input --+ X | +--> Output
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| ------------- -------------+-----+ |
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| | | |/
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| | |
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| | |\ +-----------+ |
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| ----+ | | | |
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| | +-->| Horizontal|----
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------+ | | Scaler |
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|/ +-----------+
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The unit supports downscaling, upscaling, sub pixel translation and bob
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de-interlacing.
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maintainers:
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- Liu Ying <victor.liu@nxp.com>
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properties:
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compatible:
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enum:
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- fsl,imx8qxp-dc-hscaler
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- fsl,imx8qxp-dc-vscaler
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reg:
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maxItems: 2
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reg-names:
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items:
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- const: pec
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- const: cfg
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required:
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- compatible
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- reg
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- reg-names
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additionalProperties: false
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examples:
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- |
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hscaler@561808c0 {
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compatible = "fsl,imx8qxp-dc-hscaler";
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reg = <0x561808c0 0x10>, <0x56183000 0x18>;
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reg-names = "pec", "cfg";
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};
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