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Qualcomm Technologies, Inc.
mdss-dsi is the master DSI device which supports multiple DSI host controllers
that are compatible with MIPI display serial interface specification.
DSI Controller:
Required properties:
- compatible: Should be "qcom,dsi-ctrl-hw-v<version>". Supported
versions include 1.4, 2.0 and 2.2.
eg: qcom,dsi-ctrl-hw-v1.4, qcom,dsi-ctrl-hw-v2.0,
qcom,dsi-ctrl-hw-v2.2, qcom,dsi-ctrl-hw-v2.3,
qcom,dsi-ctrl-hw-v2.4
And for dsi phy driver:
qcom,dsi-phy-v0.0-hpm, qcom,dsi-phy-v0.0-lpm,
qcom,dsi-phy-v1.0, qcom,dsi-phy-v2.0,
qcom,dsi-phy-v3.0, qcom,dsi-phy-v4.0, qcom,dsi-phy-v4.1
- reg: Base address and length of DSI controller's memory
mapped regions.
- reg-names: A list of strings that name the list of regs.
"dsi_ctrl" - DSI controller memory region.
"mmss_misc" - MMSS misc memory region.
- cell-index: Specifies the controller instance.
- clocks: Clocks required for DSI controller operation.
- clock-names: Names of the clocks corresponding to handles. Following
clocks are required:
"mdp_core_clk"
"iface_clk"
"core_mmss_clk"
"bus_clk"
"byte_clk"
"pixel_clk"
"core_clk"
"byte_clk_rcg"
"pixel_clk_rcg"
- gdsc-supply: phandle to gdsc regulator node.
- vdda-supply: phandle to vdda regulator node.
- vcca-supply: phandle to vcca regulator node.
- interrupt-parent phandle to the interrupt parent device node.
- interrupts: The interrupt signal from the DSI block.
- qcom,dsi-default-panel: Specifies the default panel.
- qcom,mdp: Specifies the mdp node which can find panel node from this.
Bus Scaling Data:
- qcom,msm-bus,name: String property describing MDSS client.
- qcom,msm-bus,num-cases: This is the number of bus scaling use cases
defined in the vectors property. This must be
set to <2> for MDSS DSI driver where use-case 0
is used to remove BW votes from the system. Use
case 1 is used to generate bandwidth requestes
when sending command packets.
- qcom,msm-bus,num-paths: This represents number of paths in each bus
scaling usecase. This value depends on number of
AXI master ports dedicated to MDSS for
particular chipset.
- qcom,msm-bus,vectors-KBps: A series of 4 cell properties, with a format
of (src, dst, ab, ib) which is defined at
Documentation/devicetree/bindings/arm/msm/msm_bus.txt.
DSI driver should always set average bandwidth
(ab) to 0 and always use instantaneous
bandwidth(ib) values.
Optional properties:
- label: String to describe controller.
- qcom,platform-te-gpio: Specifies the gpio used for TE.
- qcom,panel-te-source: Specifies the source pin for Vsync from panel or WD Timer.
- qcom,dsi-ctrl: handle to dsi controller device
- qcom,dsi-phy: handle to dsi phy device
- qcom,dsi-ctrl-num: Specifies the DSI controllers to use for primary panel
- qcom,dsi-sec-ctrl-num: Specifies the DSI controllers to use for secondary panel
- qcom,dsi-phy-num: Specifies the DSI PHYs to use for primary panel
- qcom,dsi-sec-phy-num: Specifies the DSI PHYs to use for secondary panel
- qcom,dsi-select-clocks: Specifies the required clocks to use for primary panel
- qcom,dsi-select-sec-clocks: Specifies the required clocks to use for secondary panel
- qcom,dsi-display-list: Specifies the list of supported displays.
- qcom,dsi-manager: Specifies dsi manager is present
- qcom,dsi-display: Specifies dsi display is present
- qcom,hdmi-display: Specifies hdmi is present
- qcom,dp-display: Specified dp is present
- qcom,<type>-supply-entries: A node that lists the elements of the supply used by the
a particular "type" of DSI module. The module "types"
can be "core", "ctrl", and "phy". Within the same type,
there can be more than one instance of this binding,
in which case the entry would be appended with the
supply entry index.
e.g. qcom,ctrl-supply-entry@0
-- qcom,supply-name: name of the supply (vdd/vdda/vddio)
-- qcom,supply-min-voltage: minimum voltage level (uV)
-- qcom,supply-max-voltage: maximum voltage level (uV)
-- qcom,supply-enable-load: load drawn (uA) from enabled supply
-- qcom,supply-disable-load: load drawn (uA) from disabled supply
-- qcom,supply-pre-on-sleep: time to sleep (ms) before turning on
-- qcom,supply-post-on-sleep: time to sleep (ms) after turning on
-- qcom,supply-pre-off-sleep: time to sleep (ms) before turning off
-- qcom,supply-post-off-sleep: time to sleep (ms) after turning off
- qcom,mdss-mdp-transfer-time-us: Specifies the dsi transfer time for command mode
panels in microseconds. Driver uses this number to adjust
the clock rate according to the expected transfer time.
Increasing this value would slow down the mdp processing
and can result in slower performance.
Decreasing this value can speed up the mdp processing,
but this can also impact power consumption.
As a rule this time should not be higher than the time
that would be expected with the processing at the
dsi link rate since anyways this would be the maximum
transfer time that could be achieved.
If ping pong split enabled, this time should not be higher
than two times the dsi link rate time.
If the property is not specified, then the default value is 14000 us.
- qcom,dsi-phy-isolation-enabled: A boolean property enables the phy isolation from dsi
controller. This must be enabled for debugging purpose
only with simulator panel. It should not be enabled for
normal DSI panels.
- - qcom,null-insertion-enabled: A boolean to enable NULL packet insertion feature for DSI controller.
- ports: This video port is used when external bridge is present.
The connection is modeled using the OF graph bindings
specified in Documentation/devicetree/bindings/graph.txt.
Video port 0 reg 0 is for the bridge output. The remote
endpoint phandle should be mipi_dsi_device device node.
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