linux/Documentation/devicetree/bindings/display/ti/ti,omap4-dss.txt
Peter Ujfalusi 32fdb62423 dt-bindings: display/ti: Add optional property to set memory bandwidth limit
max-memory-bandwidth can be used to specify the maximum bandwidth dispc
can use when reading display data from main memory.

In some SoC (am437x for example) we have memory bandwidth limitation
which causes underflow in the display subsystem.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
2017-12-19 10:32:00 +02:00

120 lines
2.7 KiB
Plaintext

Texas Instruments OMAP4 Display Subsystem
=========================================
See Documentation/devicetree/bindings/display/ti/ti,omap-dss.txt for generic
description about OMAP Display Subsystem bindings.
DSS Core
--------
Required properties:
- compatible: "ti,omap4-dss"
- reg: address and length of the register space
- ti,hwmods: "dss_core"
- clocks: handle to fclk
- clock-names: "fck"
Required nodes:
- DISPC
Optional nodes:
- DSS Submodules: RFBI, VENC, DSI, HDMI
- Video port for DPI output
DPI Endpoint required properties:
- data-lines: number of lines used
DISPC
-----
Required properties:
- compatible: "ti,omap4-dispc"
- reg: address and length of the register space
- ti,hwmods: "dss_dispc"
- interrupts: the DISPC interrupt
- clocks: handle to fclk
- clock-names: "fck"
Optional properties:
- max-memory-bandwidth: Input memory (from main memory to dispc) bandwidth limit
in bytes per second
RFBI
----
Required properties:
- compatible: "ti,omap4-rfbi"
- reg: address and length of the register space
- ti,hwmods: "dss_rfbi"
- clocks: handles to fclk and iclk
- clock-names: "fck", "ick"
Optional nodes:
- Video port for RFBI output
- RFBI controlled peripherals
VENC
----
Required properties:
- compatible: "ti,omap4-venc"
- reg: address and length of the register space
- ti,hwmods: "dss_venc"
- vdda-supply: power supply for DAC
- clocks: handle to fclk
- clock-names: "fck"
Optional nodes:
- Video port for VENC output
VENC Endpoint required properties:
- ti,invert-polarity: invert the polarity of the video signal
- ti,channels: 1 for composite, 2 for s-video
DSI
---
Required properties:
- compatible: "ti,omap4-dsi"
- reg: addresses and lengths of the register spaces for 'proto', 'phy' and 'pll'
- reg-names: "proto", "phy", "pll"
- interrupts: the DSI interrupt line
- ti,hwmods: "dss_dsi1" or "dss_dsi2"
- vdd-supply: power supply for DSI
- clocks: handles to fclk and pll clock
- clock-names: "fck", "sys_clk"
Optional nodes:
- Video port for DSI output
- DSI controlled peripherals
DSI Endpoint required properties:
- lanes: list of pin numbers for the DSI lanes: CLK+, CLK-, DATA0+, DATA0-,
DATA1+, DATA1-, ...
HDMI
----
Required properties:
- compatible: "ti,omap4-hdmi"
- reg: addresses and lengths of the register spaces for 'wp', 'pll', 'phy',
'core'
- reg-names: "wp", "pll", "phy", "core"
- interrupts: the HDMI interrupt line
- ti,hwmods: "dss_hdmi"
- vdda-supply: vdda power supply
- clocks: handles to fclk and pll clock
- clock-names: "fck", "sys_clk"
Optional nodes:
- Video port for HDMI output
HDMI Endpoint optional properties:
- lanes: list of 8 pin numbers for the HDMI lanes: CLK+, CLK-, D0+, D0-,
D1+, D1-, D2+, D2-. (default: 0,1,2,3,4,5,6,7)