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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/tegra/nvidia,tegra124-dpaux.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra DisplayPort AUX Interface
+
+maintainers:
+ - Thierry Reding <thierry.reding@gmail.com>
+ - Jon Hunter <jonathanh@nvidia.com>
+
+description: |
+ The Tegra Display Port Auxiliary (DPAUX) pad controller manages two
+ pins which can be assigned to either the DPAUX channel or to an I2C
+ controller.
+
+ When configured for DisplayPort AUX operation, the DPAUX controller
+ can also be used to communicate with a DisplayPort device using the
+ AUX channel.
+
+properties:
+ $nodename:
+ pattern: "^dpaux@[0-9a-f]+$"
+
+ compatible:
+ oneOf:
+ - enum:
+ - nvidia,tegra124-dpaux
+ - nvidia,tegra210-dpaux
+ - nvidia,tegra186-dpaux
+ - nvidia,tegra194-dpaux
+
+ - items:
+ - const: nvidia,tegra132-dpaux
+ - const: nvidia,tegra124-dpaux
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ clocks:
+ items:
+ - description: clock input for the DPAUX hardware
+ - description: reference clock
+
+ clock-names:
+ items:
+ - const: dpaux
+ - const: parent
+
+ resets:
+ items:
+ - description: module reset
+
+ reset-names:
+ items:
+ - const: dpaux
+
+ power-domains:
+ maxItems: 1
+
+ i2c-bus:
+ description: Subnode where I2C slave devices are listed. This
+ subnode must be always present. If there are no I2C slave
+ devices, an empty node should be added. See ../../i2c/i2c.yaml
+ for more information.
+ type: object
+
+ aux-bus:
+ $ref: /schemas/display/dp-aux-bus.yaml#
+
+ vdd-supply:
+ description: phandle of a supply that powers the DisplayPort
+ link
+
+patternProperties:
+ "^pinmux-[a-z0-9]+$":
+ description:
+ Since only three configurations are possible, only three child
+ nodes are needed to describe the pin mux'ing options for the
+ DPAUX pads. Furthermore, given that the pad functions are only
+ applicable to a single set of pads, the child nodes only need
+ to describe the pad group the functions are being applied to
+ rather than the individual pads.
+ type: object
+ properties:
+ groups:
+ const: dpaux-io
+
+ function:
+ enum:
+ - aux
+ - i2c
+ - off
+
+ additionalProperties: false
+
+ required:
+ - groups
+ - function
+
+additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - clocks
+ - clock-names
+ - resets
+ - reset-names
+
+examples:
+ - |
+ #include <dt-bindings/clock/tegra210-car.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ dpaux: dpaux@545c0000 {
+ compatible = "nvidia,tegra210-dpaux";
+ reg = <0x545c0000 0x00040000>;
+ interrupts = <GIC_SPI 159 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&tegra_car TEGRA210_CLK_DPAUX>,
+ <&tegra_car TEGRA210_CLK_PLL_DP>;
+ clock-names = "dpaux", "parent";
+ resets = <&tegra_car 181>;
+ reset-names = "dpaux";
+ power-domains = <&pd_sor>;
+
+ state_dpaux_aux: pinmux-aux {
+ groups = "dpaux-io";
+ function = "aux";
+ };
+
+ state_dpaux_i2c: pinmux-i2c {
+ groups = "dpaux-io";
+ function = "i2c";
+ };
+
+ state_dpaux_off: pinmux-off {
+ groups = "dpaux-io";
+ function = "off";
+ };
+
+ i2c-bus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };
+ };