dt-bindings: i2c: tegra: Convert to json-schema

Convert the Tegra I2C controller bindings from plain text to json-schema
format.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211217165658.2650677-1-thierry.reding@gmail.com

Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt

-NVIDIA Tegra20/Tegra30/Tegra114 I2C controller driver.
-
-Required properties:
-- compatible : For Tegra20, must be one of "nvidia,tegra20-i2c-dvc" or
-  "nvidia,tegra20-i2c".  For Tegra30, must be "nvidia,tegra30-i2c".
-  For Tegra114, must be "nvidia,tegra114-i2c".  Otherwise, must be
-  "nvidia,<chip>-i2c", plus at least one of the above, where <chip> is
-  tegra124, tegra132, or tegra210.
-  Details of compatible are as follows:
-  nvidia,tegra20-i2c-dvc: Tegra20 has specific I2C controller called as DVC I2C
-	controller. This only support master mode of I2C communication. Register
-	interface/offset and interrupts handling are different than generic I2C
-	controller. Driver of DVC I2C controller is only compatible with
-	"nvidia,tegra20-i2c-dvc".
-  nvidia,tegra20-i2c: Tegra20 has 4 generic I2C controller. This can support
-	master and slave mode of I2C communication. The i2c-tegra driver only
-	support master mode of I2C communication. Driver of I2C controller is
-	only compatible with "nvidia,tegra20-i2c".
-  nvidia,tegra30-i2c: Tegra30 has 5 generic I2C controller. This controller is
-	very much similar to Tegra20 I2C controller with additional feature:
-	Continue Transfer Support. This feature helps to implement M_NO_START
-	as per I2C core API transfer flags. Driver of I2C controller is
-	compatible with "nvidia,tegra30-i2c" to enable the continue transfer
-	support. This is also compatible with "nvidia,tegra20-i2c" without
-	continue transfer support.
-  nvidia,tegra114-i2c: Tegra114 has 5 generic I2C controller. This controller is
-	very much similar to Tegra30 I2C controller with some hardware
-	modification:
-	 - Tegra30/Tegra20 I2C controller has 2 clock source called div-clk and
-	   fast-clk. Tegra114 has only one clock source called as div-clk and
-	   hence clock mechanism is changed in I2C controller.
-	 - Tegra30/Tegra20 I2C controller has enabled per packet transfer by
-	   default and there is no way to disable it. Tegra114 has this
-	   interrupt disable by default and SW need to enable explicitly.
-	Due to above changes, Tegra114 I2C driver makes incompatible with
-	previous hardware driver. Hence, tegra114 I2C controller is compatible
-	with "nvidia,tegra114-i2c".
-  nvidia,tegra210-i2c-vi: Tegra210 has one I2C controller that is on host1x bus
-	and is part of VE power domain and typically used for camera use-cases.
-	This VI I2C controller is mostly compatible with the programming model
-	of the regular I2C controllers with a few exceptions. The I2C registers
-	start at an offset of 0xc00 (instead of 0), registers are 16 bytes
-	apart (rather than 4) and the controller does not support slave mode.
-- reg: Should contain I2C controller registers physical address and length.
-- interrupts: Should contain I2C controller interrupts.
-- address-cells: Address cells for I2C device address.
-- size-cells: Size of the I2C device address.
-- 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:
-  Tegra20/Tegra30:
-  - div-clk
-  - fast-clk
-  Tegra114:
-  - div-clk
-  Tegra210:
-  - div-clk
-  - slow (only for nvidia,tegra210-i2c-vi compatible node)
-- resets: Must contain an entry for each entry in reset-names.
-  See ../reset/reset.txt for details.
-- reset-names: Must include the following entries:
-  - i2c
-- power-domains: Only for nvidia,tegra210-i2c-vi compatible node and must
-  include venc powergate node as vi i2c is part of VE power domain.
-  tegra210-i2c-vi:
-  - pd_venc
-- dmas: Must contain an entry for each entry in clock-names.
-  See ../dma/dma.txt for details.
-- dma-names: Must include the following entries:
-  - rx
-  - tx
-
-Example:
-
-	i2c@7000c000 {
-		compatible = "nvidia,tegra20-i2c";
-		reg = <0x7000c000 0x100>;
-		interrupts = <0 38 0x04>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-		clocks = <&tegra_car 12>, <&tegra_car 124>;
-		clock-names = "div-clk", "fast-clk";
-		resets = <&tegra_car 12>;
-		reset-names = "i2c";
-		dmas = <&apbdma 16>, <&apbdma 16>;
-		dma-names = "rx", "tx";
-	};

Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/nvidia,tegra20-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+maintainers:
+  - Thierry Reding <thierry.reding@gmail.com>
+  - Jon Hunter <jonathanh@nvidia.com>
+
+title: NVIDIA Tegra I2C controller driver
+
+properties:
+  compatible:
+    oneOf:
+      - description: Tegra20 has 4 generic I2C controller. This can support
+          master and slave mode of I2C communication. The i2c-tegra driver
+          only support master mode of I2C communication. Driver of I2C
+          controller is only compatible with "nvidia,tegra20-i2c".
+        const: nvidia,tegra20-i2c
+      - description: Tegra20 has specific I2C controller called as DVC I2C
+          controller. This only support master mode of I2C communication.
+          Register interface/offset and interrupts handling are different than
+          generic I2C controller. Driver of DVC I2C controller is only
+          compatible with "nvidia,tegra20-i2c-dvc".
+        const: nvidia,tegra20-i2c-dvc
+      - description: |
+          Tegra30 has 5 generic I2C controller. This controller is very much
+          similar to Tegra20 I2C controller with additional feature: Continue
+          Transfer Support. This feature helps to implement M_NO_START as per
+          I2C core API transfer flags. Driver of I2C controller is compatible
+          with "nvidia,tegra30-i2c" to enable the continue transfer support.
+          This is also compatible with "nvidia,tegra20-i2c" without continue
+          transfer support.
+        items:
+          - const: nvidia,tegra30-i2c
+          - const: nvidia,tegra20-i2c
+      - description: |
+          Tegra114 has 5 generic I2C controllers. This controller is very much
+          similar to Tegra30 I2C controller with some hardware modification:
+            - Tegra30/Tegra20 I2C controller has 2 clock source called div-clk
+              and fast-clk. Tegra114 has only one clock source called as
+              div-clk and hence clock mechanism is changed in I2C controller.
+            - Tegra30/Tegra20 I2C controller has enabled per packet transfer
+              by default and there is no way to disable it. Tegra114 has this
+              interrupt disable by default and SW need to enable explicitly.
+          Due to above changes, Tegra114 I2C driver makes incompatible with
+          previous hardware driver. Hence, Tegra114 I2C controller is
+          compatible with "nvidia,tegra114-i2c".
+        const: nvidia,tegra114-i2c
+      - description: |
+          Tegra124 has 6 generic I2C controllers. These controllers are very
+          similar to those found on Tegra114 but also contain several hardware
+          improvements and new registers.
+        const: nvidia,tegra124-i2c
+      - description: |
+          Tegra210 has 6 generic I2C controllers. These controllers are very
+          similar to those found on Tegra124.
+        items:
+          - const: nvidia,tegra210-i2c
+          - const: nvidia,tegra124-i2c
+      - description: |
+          Tegra210 has one I2C controller that is on host1x bus and is part of
+          the VE power domain and typically used for camera use-cases. This VI
+          I2C controller is mostly compatible with the programming model of
+          the regular I2C controllers with a few exceptions. The I2C registers
+          start at an offset of 0xc00 (instead of 0), registers are 16 bytes
+          apart (rather than 4) and the controller does not support slave
+          mode.
+        const: nvidia,tegra210-i2c-vi
+      - description: |
+          Tegra186 has 9 generic I2C controllers, two of which are in the AON
+          (always-on) partition of the SoC. All of these controllers are very
+          similar to those found on Tegra210.
+        const: nvidia,tegra186-i2c
+      - description: |
+          Tegra194 has 8 generic I2C controllers, two of which are in the AON
+          (always-on) partition of the SoC. All of these controllers are very
+          similar to those found on Tegra186. However, these controllers have
+          support for 64 KiB transactions whereas earlier chips supported no
+          more than 4 KiB per transactions.
+        const: nvidia,tegra194-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  clocks:
+    minItems: 1
+    maxItems: 2
+
+  clock-names:
+    minItems: 1
+    maxItems: 2
+
+  resets:
+    items:
+      - description: module reset
+
+  reset-names:
+    items:
+      - const: i2c
+
+  dmas:
+    items:
+      - description: DMA channel for the reception FIFO
+      - description: DMA channel for the transmission FIFO
+
+  dma-names:
+    items:
+      - const: rx
+      - const: tx
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - nvidia,tegra20-i2c
+              - nvidia,tegra30-i2c
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: div-clk
+            - const: fast-clk
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nvidia,tegra114-i2c
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: div-clk
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nvidia,tegra210-i2c
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: div-clk
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nvidia,tegra210-i2c-vi
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: div-clk
+            - const: slow
+        power-domains:
+          items:
+            - description: phandle to the VENC power domain
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c@7000c000 {
+        compatible = "nvidia,tegra20-i2c";
+        reg = <0x7000c000 0x100>;
+        interrupts = <0 38 0x04>;
+        clocks = <&tegra_car 12>, <&tegra_car 124>;
+        clock-names = "div-clk", "fast-clk";
+        resets = <&tegra_car 12>;
+        reset-names = "i2c";
+        dmas = <&apbdma 16>, <&apbdma 16>;
+        dma-names = "rx", "tx";
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };