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NVIDIA TEGRA114 High Definition Multimedia Interface
====================================================
1) The hdmi node:
hdmi node must be contained in host1x parent node. This node represents NVIDIA TEGRA114
High Definition Multimedia Interface.
Required properties
- name: hdmi
- compatible: Should contain "nvidia,tegra114-hdmi".
- reg: Physical base address and length of the controller's registers.
- interrupts: The interrupt outputs from the controller.
Optional properties:
- nvidia,ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
- nvidia,hpd-gpio: specifies a GPIO used for hotplug detection
- nvidia,edid: supplies a binary EDID blob
- nvidia,hotplug-report: With 1, it will have optional hotplug report callback
which does only set DDC_SDA and DDC_SCL pull downs to be active when hotplug
is detected, otherwise keep them disabled.
1.B) NVIDIA HDMI TMDS configurations
This must be contained in hdmi parent node. This includes tmds configurations.
Required properties:
- name: Should be "nvidia,out-tmds-cfg"
- Child nodes represent tmds configurations. Several configurations can be prepared.
1.B.i) NVIDIA HDMI TMDS configuration
This must be contained in nvidia,out-tmds-cfg parent node. This includes tmds configuration.
Required properties:
- name: Can be arbitrary, but each sibling node should have unique name.
- pclk: pixel clk required in tmds table for each mode.
- pll0: See HDMI_NV_PDISP_SOR_PLL0_0 in Tegra TRM.
- pll1: See HDMI_NV_PDISP_SOR_PLL1_0 in Tegra TRM.
- pe-current: Individual lane pre-emphasis current control (4bits per lane)
See HDMI_NV_PDISP_PE_CURRENT_0 in Tegra TRM.
- drive-current: TMDS per-lane I/O current control.
See HDMI_NV_PDISP_SOR_LANE_DRIVE_CURRENT_0 in Tegra TRM.
- peak-current: New pad controls for 28nm macro TMDS_X4_HP 8 bits per lane.
See HDMI_NV_PDISP_SOR_IO_PEAK_CURRENT_0 in Tegra TRM.
Example
host1x {
hdmi {
compatible = "nvidia,tegra114-hdmi";
reg = <0x54280000 0x00040000>;
interrupts = <0 75 0x04>;
status = "okay";
nvidia,ddc-i2c-bus = <&hdmi_ddc>;
nvidia,hpd-gpio = <&gpio 111 1>;
};
};
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