dt-bindings: PCI: tegra194: Convert to json-schema

Convert the Tegra194 PCIe bindings from the free-form text format to
json-schema.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vidya Sagar <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie-ep.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/nvidia,tegra194-pcie-ep.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra194 (and later) PCIe Endpoint controller (Synopsys DesignWare Core based)
+
+maintainers:
+  - Thierry Reding <[e-mail]>
+  - Jon Hunter <[e-mail]>
+  - Vidya Sagar <[e-mail]>
+
+description: |
+  This PCIe controller is based on the Synopsys DesignWare PCIe IP and thus
+  inherits all the common properties defined in snps,dw-pcie-ep.yaml.  Some
+  of the controller instances are dual mode; they can work either in Root
+  Port mode or Endpoint mode but one at a time.
+
+  On Tegra194, controllers C0, C4 and C5 support Endpoint mode.
+
+  Note: On Tegra194's P2972-0000 platform, only C5 controller can be enabled to
+  operate in the Endpoint mode because of the way the platform is designed.
+
+properties:
+  compatible:
+    enum:
+      - nvidia,tegra194-pcie-ep
+
+  reg:
+    items:
+      - description: controller's application logic registers
+      - description: iATU and DMA registers. This is where the iATU (internal
+          Address Translation Unit) registers of the PCIe core are made
+          available for software access.
+      - description: aperture where the Root Port's own configuration
+          registers are available.
+      - description: aperture used to map the remote Root Complex address space
+
+  reg-names:
+    items:
+      - const: appl
+      - const: atu_dma
+      - const: dbi
+      - const: addr_space
+
+  interrupts:
+    items:
+      - description: controller interrupt
+
+  interrupt-names:
+    items:
+      - const: intr
+
+  clocks:
+    items:
+      - description: module clock
+
+  clock-names:
+    items:
+      - const: core
+
+  resets:
+    items:
+      - description: APB bus interface reset
+      - description: module reset
+
+  reset-names:
+    items:
+      - const: apb
+      - const: core
+
+  reset-gpios:
+    description: Must contain a phandle to a GPIO controller followed by GPIO
+      that is being used as PERST input signal. Please refer to pci.txt.
+
+  phys:
+    minItems: 1
+    maxItems: 8
+
+  phy-names:
+    minItems: 1
+    items:
+      - const: p2u-0
+      - const: p2u-1
+      - const: p2u-2
+      - const: p2u-3
+      - const: p2u-4
+      - const: p2u-5
+      - const: p2u-6
+      - const: p2u-7
+
+  power-domains:
+    maxItems: 1
+    description: |
+      A phandle to the node that controls power to the respective PCIe
+      controller and a specifier name for the PCIe controller.
+
+      Specifiers defined in "include/dt-bindings/power/tegra194-powergate.h".
+
+  interconnects:
+    items:
+      - description: memory read client
+      - description: memory write client
+
+  interconnect-names:
+    items:
+      - const: dma-mem # read
+      - const: write
+
+  dma-coherent: true
+
+  nvidia,bpmp:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      Must contain a pair of phandles to BPMP controller node followed by
+      controller ID. Following are the controller IDs for each controller:
+
+        0: C0
+        1: C1
+        2: C2
+        3: C3
+        4: C4
+        5: C5
+    items:
+      - items:
+          - description: phandle to BPMP controller node
+          - description: PCIe controller ID
+            maximum: 5
+
+  nvidia,aspm-cmrt-us:
+    description: Common Mode Restore Time for proper operation of ASPM to be
+      specified in microseconds
+
+  nvidia,aspm-pwr-on-t-us:
+    description: Power On time for proper operation of ASPM to be specified in
+      microseconds
+
+  nvidia,aspm-l0s-entrance-latency-us:
+    description: ASPM L0s entrance latency to be specified in microseconds
+
+  vddio-pex-ctl-supply:
+    description: A phandle to the regulator supply for PCIe side band signals
+
+  nvidia,refclk-select-gpios:
+    maxItems: 1
+    description: GPIO used to enable REFCLK to controller from the host
+
+allOf:
+  - $ref: /schemas/pci/snps,dw-pcie-ep.yaml#
+
+unevaluatedProperties: false
+
+required:
+  - interrupts
+  - interrupt-names
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - power-domains
+  - reset-gpios
+  - vddio-pex-ctl-supply
+  - num-lanes
+  - phys
+  - phy-names
+  - nvidia,bpmp
+
+examples:
+  - |
+    #include <dt-bindings/clock/tegra194-clock.h>
+    #include <dt-bindings/gpio/tegra194-gpio.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/tegra194-powergate.h>
+    #include <dt-bindings/reset/tegra194-reset.h>
+
+    bus@0 {
+        #address-cells = <2>;
+        #size-cells = <2>;
+        ranges = <0x0 0x0 0x0 0x8 0x0>;
+
+        pcie-ep@141a0000 {
+            compatible = "nvidia,tegra194-pcie-ep";
+            reg = <0x00 0x141a0000 0x0 0x00020000>, /* appl registers (128K) */
+                  <0x00 0x3a040000 0x0 0x00040000>, /* iATU_DMA reg space (256K)  */
+                  <0x00 0x3a080000 0x0 0x00040000>, /* DBI reg space (256K) */
+                  <0x1c 0x00000000 0x4 0x00000000>; /* Address Space (16G) */
+            reg-names = "appl", "atu_dma", "dbi", "addr_space";
+            interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>; /* controller interrupt */
+            interrupt-names = "intr";
+
+            clocks = <&bpmp TEGRA194_CLK_PEX1_CORE_5>;
+            clock-names = "core";
+
+            resets = <&bpmp TEGRA194_RESET_PEX1_CORE_5_APB>,
+                     <&bpmp TEGRA194_RESET_PEX1_CORE_5>;
+            reset-names = "apb", "core";
+
+            power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8A>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&clkreq_c5_bi_dir_state>;
+
+            nvidia,bpmp = <&bpmp 5>;
+
+            nvidia,aspm-cmrt-us = <60>;
+            nvidia,aspm-pwr-on-t-us = <20>;
+            nvidia,aspm-l0s-entrance-latency-us = <3>;
+
+            vddio-pex-ctl-supply = <&vdd_1v8ao>;
+
+            reset-gpios = <&gpio TEGRA194_MAIN_GPIO(GG, 1) GPIO_ACTIVE_LOW>;
+
+            nvidia,refclk-select-gpios = <&gpio_aon TEGRA194_AON_GPIO(AA, 5)
+                                          GPIO_ACTIVE_HIGH>;
+
+            num-lanes = <8>;
+
+            phys = <&p2u_nvhs_0>, <&p2u_nvhs_1>, <&p2u_nvhs_2>,
+                   <&p2u_nvhs_3>, <&p2u_nvhs_4>, <&p2u_nvhs_5>,
+                   <&p2u_nvhs_6>, <&p2u_nvhs_7>;
+
+            phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3", "p2u-4",
+                        "p2u-5", "p2u-6", "p2u-7";
+        };
+    };

Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt

···
-NVIDIA Tegra PCIe controller (Synopsys DesignWare Core based)
-
-This PCIe controller is based on the Synopsis Designware PCIe IP
-and thus inherits all the common properties defined in snps,dw-pcie.yaml and
-snps,dw-pcie-ep.yaml.
-Some of the controller instances are dual mode where in they can work either
-in root port mode or endpoint mode but one at a time.
-
-Required properties:
-- power-domains: A phandle to the node that controls power to the respective
-  PCIe controller and a specifier name for the PCIe controller. Following are
-  the specifiers for the different PCIe controllers
-    TEGRA194_POWER_DOMAIN_PCIEX8B: C0
-    TEGRA194_POWER_DOMAIN_PCIEX1A: C1
-    TEGRA194_POWER_DOMAIN_PCIEX1A: C2
-    TEGRA194_POWER_DOMAIN_PCIEX1A: C3
-    TEGRA194_POWER_DOMAIN_PCIEX4A: C4
-    TEGRA194_POWER_DOMAIN_PCIEX8A: C5
-  these specifiers are defined in
-  "include/dt-bindings/power/tegra194-powergate.h" file.
-- reg: A list of physical base address and length pairs for each set of
-  controller registers. Must contain an entry for each entry in the reg-names
-  property.
-- reg-names: Must include the following entries:
-  "appl": Controller's application logic registers
-  "config": As per the definition in snps,dw-pcie.yaml
-  "atu_dma": iATU and DMA registers. This is where the iATU (internal Address
-             Translation Unit) registers of the PCIe core are made available
-             for SW access.
-  "dbi": The aperture where root port's own configuration registers are
-         available
-- interrupts: A list of interrupt outputs of the controller. Must contain an
-  entry for each entry in the interrupt-names property.
-- interrupt-names: Must include the following entries:
-  "intr": The Tegra interrupt that is asserted for controller interrupts
-- clocks: Must contain an entry for each entry in clock-names.
-  See ../clocks/clock-bindings.txt for details.
-- clock-names: Must include the following entries:
-  - core
-- resets: Must contain an entry for each entry in reset-names.
-  See ../reset/reset.txt for details.
-- reset-names: Must include the following entries:
-  - apb
-  - core
-- phys: Must contain a phandle to P2U PHY for each entry in phy-names.
-- phy-names: Must include an entry for each active lane.
-  "p2u-N": where N ranges from 0 to one less than the total number of lanes
-- nvidia,bpmp: Must contain a pair of phandle to BPMP controller node followed
-  by controller-id. Following are the controller ids for each controller.
-    0: C0
-    1: C1
-    2: C2
-    3: C3
-    4: C4
-    5: C5
-- vddio-pex-ctl-supply: Regulator supply for PCIe side band signals
-
-RC mode:
-- compatible: Tegra19x must contain  "nvidia,tegra194-pcie"
-- device_type: Must be "pci" for RC mode
-- interrupt-names: Must include the following entries:
-  "msi": The Tegra interrupt that is asserted when an MSI is received
-- bus-range: Range of bus numbers associated with this controller
-- #address-cells: Address representation for root ports (must be 3)
-  - cell 0 specifies the bus and device numbers of the root port:
-    [23:16]: bus number
-    [15:11]: device number
-  - cell 1 denotes the upper 32 address bits and should be 0
-  - cell 2 contains the lower 32 address bits and is used to translate to the
-    CPU address space
-- #size-cells: Size representation for root ports (must be 2)
-- ranges: Describes the translation of addresses for root ports and standard
-  PCI regions. The entries must be 7 cells each, where the first three cells
-  correspond to the address as described for the #address-cells property
-  above, the fourth and fifth cells are for the physical CPU address to
-  translate to and the sixth and seventh cells are as described for the
-  #size-cells property above.
-  - Entries setup the mapping for the standard I/O, memory and
-    prefetchable PCI regions. The first cell determines the type of region
-    that is setup:
-    - 0x81000000: I/O memory region
-    - 0x82000000: non-prefetchable memory region
-    - 0xc2000000: prefetchable memory region
-  Please refer to the standard PCI bus binding document for a more detailed
-  explanation.
-- #interrupt-cells: Size representation for interrupts (must be 1)
-- interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties
-  Please refer to the standard PCI bus binding document for a more detailed
-  explanation.
-
-EP mode:
-In Tegra194, Only controllers C0, C4 & C5 support EP mode.
-- compatible: Tegra19x must contain "nvidia,tegra194-pcie-ep"
-- reg-names: Must include the following entries:
-  "addr_space": Used to map remote RC address space
-- reset-gpios: Must contain a phandle to a GPIO controller followed by
-  GPIO that is being used as PERST input signal. Please refer to pci.txt
-  document.
-
-Optional properties:
-- pinctrl-names: A list of pinctrl state names.
-  It is mandatory for C5 controller and optional for other controllers.
-  - "default": Configures PCIe I/O for proper operation.
-- pinctrl-0: phandle for the 'default' state of pin configuration.
-  It is mandatory for C5 controller and optional for other controllers.
-- supports-clkreq: Refer to Documentation/devicetree/bindings/pci/pci.txt
-- nvidia,update-fc-fixup: This is a boolean property and needs to be present to
-    improve performance when a platform is designed in such a way that it
-    satisfies at least one of the following conditions thereby enabling root
-    port to exchange optimum number of FC (Flow Control) credits with
-    downstream devices
-    1. If C0/C4/C5 run at x1/x2 link widths (irrespective of speed and MPS)
-    2. If C0/C1/C2/C3/C4/C5 operate at their respective max link widths and
-       a) speed is Gen-2 and MPS is 256B
-       b) speed is >= Gen-3 with any MPS
-- nvidia,aspm-cmrt-us: Common Mode Restore Time for proper operation of ASPM
-   to be specified in microseconds
-- nvidia,aspm-pwr-on-t-us: Power On time for proper operation of ASPM to be
-   specified in microseconds
-- nvidia,aspm-l0s-entrance-latency-us: ASPM L0s entrance latency to be
-   specified in microseconds
-
-RC mode:
-- vpcie3v3-supply: A phandle to the regulator node that supplies 3.3V to the slot
-  if the platform has one such slot. (Ex:- x16 slot owned by C5 controller
-  in p2972-0000 platform).
-- vpcie12v-supply: A phandle to the regulator node that supplies 12V to the slot
-  if the platform has one such slot. (Ex:- x16 slot owned by C5 controller
-  in p2972-0000 platform).
-
-EP mode:
-- nvidia,refclk-select-gpios: Must contain a phandle to a GPIO controller
-  followed by GPIO that is being used to enable REFCLK to controller from host
-
-NOTE:- On Tegra194's P2972-0000 platform, only C5 controller can be enabled to
-operate in the endpoint mode because of the way the platform is designed.
-
-Examples:
-=========
-
-Tegra194 RC mode:
------------------
-
-	pcie@14180000 {
-		compatible = "nvidia,tegra194-pcie";
-		power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8B>;
-		reg = <0x00 0x14180000 0x0 0x00020000   /* appl registers (128K)      */
-		       0x00 0x38000000 0x0 0x00040000   /* configuration space (256K) */
-		       0x00 0x38040000 0x0 0x00040000>; /* iATU_DMA reg space (256K)  */
-		reg-names = "appl", "config", "atu_dma";
-
-		#address-cells = <3>;
-		#size-cells = <2>;
-		device_type = "pci";
-		num-lanes = <8>;
-		linux,pci-domain = <0>;
-
-		pinctrl-names = "default";
-		pinctrl-0 = <&pex_rst_c5_out_state>, <&clkreq_c5_bi_dir_state>;
-
-		clocks = <&bpmp TEGRA194_CLK_PEX0_CORE_0>;
-		clock-names = "core";
-
-		resets = <&bpmp TEGRA194_RESET_PEX0_CORE_0_APB>,
-			 <&bpmp TEGRA194_RESET_PEX0_CORE_0>;
-		reset-names = "apb", "core";
-
-		interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>,	/* controller interrupt */
-			     <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;	/* MSI interrupt */
-		interrupt-names = "intr", "msi";
-
-		#interrupt-cells = <1>;
-		interrupt-map-mask = <0 0 0 0>;
-		interrupt-map = <0 0 0 0 &gic GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
-
-		nvidia,bpmp = <&bpmp 0>;
-
-		supports-clkreq;
-		nvidia,aspm-cmrt-us = <60>;
-		nvidia,aspm-pwr-on-t-us = <20>;
-		nvidia,aspm-l0s-entrance-latency-us = <3>;
-
-		bus-range = <0x0 0xff>;
-		ranges = <0x81000000 0x0  0x38100000 0x0  0x38100000 0x0 0x00100000    /* downstream I/O (1MB) */
-			  0x82000000 0x0  0x38200000 0x0  0x38200000 0x0 0x01E00000    /* non-prefetchable memory (30MB) */
-			  0xc2000000 0x18 0x00000000 0x18 0x00000000 0x4 0x00000000>;  /* prefetchable memory (16GB) */
-
-		vddio-pex-ctl-supply = <&vdd_1v8ao>;
-		vpcie3v3-supply = <&vdd_3v3_pcie>;
-		vpcie12v-supply = <&vdd_12v_pcie>;
-
-		phys = <&p2u_hsio_2>, <&p2u_hsio_3>, <&p2u_hsio_4>,
-		       <&p2u_hsio_5>;
-		phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3";
-	};
-
-Tegra194 EP mode:
------------------
-
-	pcie-ep@141a0000 {
-		compatible = "nvidia,tegra194-pcie-ep", "snps,dw-pcie-ep";
-		power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8A>;
-		reg = <0x00 0x141a0000 0x0 0x00020000   /* appl registers (128K)      */
-		       0x00 0x3a040000 0x0 0x00040000   /* iATU_DMA reg space (256K)  */
-		       0x00 0x3a080000 0x0 0x00040000   /* DBI reg space (256K)       */
-		       0x1c 0x00000000 0x4 0x00000000>; /* Address Space (16G)        */
-		reg-names = "appl", "atu_dma", "dbi", "addr_space";
-
-		num-lanes = <8>;
-		num-ib-windows = <2>;
-		num-ob-windows = <8>;
-
-		pinctrl-names = "default";
-		pinctrl-0 = <&clkreq_c5_bi_dir_state>;
-
-		clocks = <&bpmp TEGRA194_CLK_PEX1_CORE_5>;
-		clock-names = "core";
-
-		resets = <&bpmp TEGRA194_RESET_PEX1_CORE_5_APB>,
-			 <&bpmp TEGRA194_RESET_PEX1_CORE_5>;
-		reset-names = "apb", "core";
-
-		interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>;	/* controller interrupt */
-		interrupt-names = "intr";
-
-		nvidia,bpmp = <&bpmp 5>;
-
-		nvidia,aspm-cmrt-us = <60>;
-		nvidia,aspm-pwr-on-t-us = <20>;
-		nvidia,aspm-l0s-entrance-latency-us = <3>;
-
-		vddio-pex-ctl-supply = <&vdd_1v8ao>;
-
-		reset-gpios = <&gpio TEGRA194_MAIN_GPIO(GG, 1) GPIO_ACTIVE_LOW>;
-
-		nvidia,refclk-select-gpios = <&gpio_aon TEGRA194_AON_GPIO(AA, 5)
-					      GPIO_ACTIVE_HIGH>;
-
-		phys = <&p2u_nvhs_0>, <&p2u_nvhs_1>, <&p2u_nvhs_2>,
-		       <&p2u_nvhs_3>, <&p2u_nvhs_4>, <&p2u_nvhs_5>,
-		       <&p2u_nvhs_6>, <&p2u_nvhs_7>;
-
-		phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3", "p2u-4",
-			    "p2u-5", "p2u-6", "p2u-7";
-	};

Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/nvidia,tegra194-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra194 (and later) PCIe controller (Synopsys DesignWare Core based)
+
+maintainers:
+  - Thierry Reding <[e-mail]>
+  - Jon Hunter <[e-mail]>
+  - Vidya Sagar <[e-mail]>
+
+description: |
+  This PCIe controller is based on the Synopsys DesignWare PCIe IP and thus
+  inherits all the common properties defined in snps,dw-pcie.yaml. Some of
+  the controller instances are dual mode where in they can work either in
+  Root Port mode or Endpoint mode but one at a time.
+
+  See nvidia,tegra194-pcie-ep.yaml for details on the Endpoint mode device
+  tree bindings.
+
+properties:
+  compatible:
+    enum:
+      - nvidia,tegra194-pcie
+
+  reg:
+    items:
+      - description: controller's application logic registers
+      - description: configuration registers
+      - description: iATU and DMA registers. This is where the iATU (internal
+          Address Translation Unit) registers of the PCIe core are made
+          available for software access.
+      - description: aperture where the Root Port's own configuration
+          registers are available.
+
+  reg-names:
+    items:
+      - const: appl
+      - const: config
+      - const: atu_dma
+      - const: dbi
+
+  interrupts:
+    items:
+      - description: controller interrupt
+      - description: MSI interrupt
+
+  interrupt-names:
+    items:
+      - const: intr
+      - const: msi
+
+  clocks:
+    items:
+      - description: module clock
+
+  clock-names:
+    items:
+      - const: core
+
+  resets:
+    items:
+      - description: APB bus interface reset
+      - description: module reset
+
+  reset-names:
+    items:
+      - const: apb
+      - const: core
+
+  phys:
+    minItems: 1
+    maxItems: 8
+
+  phy-names:
+    minItems: 1
+    items:
+      - const: p2u-0
+      - const: p2u-1
+      - const: p2u-2
+      - const: p2u-3
+      - const: p2u-4
+      - const: p2u-5
+      - const: p2u-6
+      - const: p2u-7
+
+  power-domains:
+    maxItems: 1
+    description: |
+      A phandle to the node that controls power to the respective PCIe
+      controller and a specifier name for the PCIe controller.
+
+      specifiers are defined in "include/dt-bindings/power/tegra194-powergate.h" file.
+
+  interconnects:
+    items:
+      - description: memory read client
+      - description: memory write client
+
+  interconnect-names:
+    items:
+      - const: dma-mem # read
+      - const: write
+
+  dma-coherent: true
+
+  nvidia,bpmp:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      Must contain a pair of phandles to BPMP controller node followed by
+      controller ID. Following are the controller IDs for each controller:
+
+        0: C0
+        1: C1
+        2: C2
+        3: C3
+        4: C4
+        5: C5
+    items:
+      - items:
+          - description: phandle to BPMP controller node
+          - description: PCIe controller ID
+            maximum: 5
+
+  nvidia,update-fc-fixup:
+    description: |
+      This is a boolean property and needs to be present to improve performance
+      when a platform is designed in such a way that it satisfies at least one
+      of the following conditions thereby enabling Root Port to exchange
+      optimum number of FC (Flow Control) credits with downstream devices:
+
+        1. If C0/C4/C5 run at x1/x2 link widths (irrespective of speed and MPS)
+        2. If C0/C1/C2/C3/C4/C5 operate at their respective max link widths and
+          a) speed is Gen-2 and MPS is 256B
+          b) speed is >= Gen-3 with any MPS
+
+    $ref: /schemas/types.yaml#/definitions/flag
+
+  nvidia,aspm-cmrt-us:
+    description: Common Mode Restore Time for proper operation of ASPM to be
+      specified in microseconds
+
+  nvidia,aspm-pwr-on-t-us:
+    description: Power On time for proper operation of ASPM to be specified in
+      microseconds
+
+  nvidia,aspm-l0s-entrance-latency-us:
+    description: ASPM L0s entrance latency to be specified in microseconds
+
+  vddio-pex-ctl-supply:
+    description: A phandle to the regulator supply for PCIe side band signals.
+
+  vpcie3v3-supply:
+    description: A phandle to the regulator node that supplies 3.3V to the slot
+      if the platform has one such slot, e.g., x16 slot owned by C5 controller
+      in p2972-0000 platform.
+
+  vpcie12v-supply:
+    description: A phandle to the regulator node that supplies 12V to the slot
+      if the platform has one such slot, e.g., x16 slot owned by C5 controller
+      in p2972-0000 platform.
+
+allOf:
+  - $ref: /schemas/pci/snps,dw-pcie.yaml#
+
+unevaluatedProperties: false
+
+required:
+  - interrupts
+  - interrupt-names
+  - interrupt-map
+  - interrupt-map-mask
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - power-domains
+  - vddio-pex-ctl-supply
+  - num-lanes
+  - phys
+  - phy-names
+  - nvidia,bpmp
+
+examples:
+  - |
+    #include <dt-bindings/clock/tegra194-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/tegra194-powergate.h>
+    #include <dt-bindings/reset/tegra194-reset.h>
+
+    bus@0 {
+        #address-cells = <2>;
+        #size-cells = <2>;
+        ranges = <0x0 0x0 0x0 0x8 0x0>;
+
+        pcie@14180000 {
+            compatible = "nvidia,tegra194-pcie";
+            power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8B>;
+            reg = <0x0 0x14180000 0x0 0x00020000>, /* appl registers (128K)      */
+                  <0x0 0x38000000 0x0 0x00040000>, /* configuration space (256K) */
+                  <0x0 0x38040000 0x0 0x00040000>, /* iATU_DMA reg space (256K)  */
+                  <0x0 0x38080000 0x0 0x00040000>; /* DBI reg space (256K)       */
+            reg-names = "appl", "config", "atu_dma", "dbi";
+
+            #address-cells = <3>;
+            #size-cells = <2>;
+            device_type = "pci";
+            num-lanes = <8>;
+            linux,pci-domain = <0>;
+
+            pinctrl-names = "default";
+            pinctrl-0 = <&pex_rst_c5_out_state>, <&clkreq_c5_bi_dir_state>;
+
+            clocks = <&bpmp TEGRA194_CLK_PEX0_CORE_0>;
+            clock-names = "core";
+
+            resets = <&bpmp TEGRA194_RESET_PEX0_CORE_0_APB>,
+                     <&bpmp TEGRA194_RESET_PEX0_CORE_0>;
+            reset-names = "apb", "core";
+
+            interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>, /* controller interrupt */
+                         <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>; /* MSI interrupt */
+            interrupt-names = "intr", "msi";
+
+            #interrupt-cells = <1>;
+            interrupt-map-mask = <0 0 0 0>;
+            interrupt-map = <0 0 0 0 &gic GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
+
+            nvidia,bpmp = <&bpmp 0>;
+
+            supports-clkreq;
+            nvidia,aspm-cmrt-us = <60>;
+            nvidia,aspm-pwr-on-t-us = <20>;
+            nvidia,aspm-l0s-entrance-latency-us = <3>;
+
+            bus-range = <0x0 0xff>;
+            ranges = <0x81000000 0x0  0x38100000 0x0  0x38100000 0x0 0x00100000>, /* downstream I/O */
+                     <0x82000000 0x0  0x38200000 0x0  0x38200000 0x0 0x01e00000>, /* non-prefetch memory */
+                     <0xc2000000 0x18 0x00000000 0x18 0x00000000 0x4 0x00000000>; /* prefetchable memory */
+
+            vddio-pex-ctl-supply = <&vdd_1v8ao>;
+            vpcie3v3-supply = <&vdd_3v3_pcie>;
+            vpcie12v-supply = <&vdd_12v_pcie>;
+
+            phys = <&p2u_hsio_2>, <&p2u_hsio_3>, <&p2u_hsio_4>,
+                   <&p2u_hsio_5>;
+            phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3";
+        };
+    };

Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml

···
     minItems: 2
     maxItems: 5
     items:
-      enum: [ dbi, dbi2, config, atu, app, elbi, mgmt, ctrl, parf, cfg, link,
-              ulreg, smu, mpu, apb, phy ]
+      enum: [ dbi, dbi2, config, atu, atu_dma, app, appl, elbi, mgmt, ctrl,
+              parf, cfg, link, ulreg, smu, mpu, apb, phy ]
 
   num-lanes:
     description: |