ASoC: dt-bindings: tegra: Add json-schema for Tegra audio graph card

Add YAML schema for Tegra audio graph sound card DT bindings. It uses the
same DT bindings provided by generic audio graph driver. Along with this
few standard clock DT bindings are added which are specifically required
for Tegra audio.
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/1611048496-24650-3-git-send-email-spujar@nvidia.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/nvidia,tegra-audio-graph-card.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/nvidia,tegra-audio-graph-card.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Audio Graph based Tegra sound card driver
+
+description: |
+  This is based on generic audio graph card driver along with additional
+  customizations for Tegra platforms. It uses the same bindings with
+  additional standard clock DT bindings required for Tegra.
+
+maintainers:
+  - Jon Hunter <jonathanh@nvidia.com>
+  - Sameer Pujar <spujar@nvidia.com>
+
+allOf:
+  - $ref: audio-graph.yaml#
+
+properties:
+  compatible:
+    enum:
+      - nvidia,tegra210-audio-graph-card
+      - nvidia,tegra186-audio-graph-card
+
+  clocks:
+    minItems: 2
+
+  clock-names:
+    minItems: 2
+    items:
+      - const: pll_a
+      - const: plla_out0
+
+  assigned-clocks:
+    minItems: 1
+    maxItems: 3
+
+  assigned-clock-parents:
+    minItems: 1
+    maxItems: 3
+
+  assigned-clock-rates:
+    minItems: 1
+    maxItems: 3
+
+required:
+  - clocks
+  - clock-names
+  - assigned-clocks
+  - assigned-clock-parents
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include<dt-bindings/clock/tegra210-car.h>
+
+    tegra_sound {
+        compatible = "nvidia,tegra210-audio-graph-card";
+
+        clocks = <&tegra_car TEGRA210_CLK_PLL_A>,
+                 <&tegra_car TEGRA210_CLK_PLL_A_OUT0>;
+        clock-names = "pll_a", "plla_out0";
+
+        assigned-clocks = <&tegra_car TEGRA210_CLK_PLL_A>,
+                          <&tegra_car TEGRA210_CLK_PLL_A_OUT0>,
+                          <&tegra_car TEGRA210_CLK_EXTERN1>;
+        assigned-clock-parents = <0>, <0>, <&tegra_car TEGRA210_CLK_PLL_A_OUT0>;
+        assigned-clock-rates = <368640000>, <49152000>, <12288000>;
+
+        dais = /* FE */
+               <&admaif1_port>,
+               /* Router */
+               <&xbar_i2s1_port>,
+               /* I/O DAP Ports */
+               <&i2s1_port>;
+
+        label = "jetson-tx1-ape";
+    };
+
+    // The ports are defined for AHUB and its child devices.
+    ahub@702d0800 {
+        compatible = "nvidia,tegra210-ahub";
+        reg = <0x702d0800 0x800>;
+        clocks = <&tegra_car TEGRA210_CLK_D_AUDIO>;
+        clock-names = "ahub";
+        assigned-clocks = <&tegra_car TEGRA210_CLK_D_AUDIO>;
+        assigned-clock-parents = <&tegra_car TEGRA210_CLK_PLL_A_OUT0>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0x702d0000 0x702d0000 0x0000e400>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0x0>;
+                xbar_admaif1_ep: endpoint {
+                    remote-endpoint = <&admaif1_ep>;
+                };
+            };
+
+            // ...
+
+            xbar_i2s1_port: port@a {
+                reg = <0xa>;
+                xbar_i2s1_ep: endpoint {
+                    remote-endpoint = <&i2s1_cif_ep>;
+                };
+            };
+        };
+
+        admaif@702d0000 {
+            compatible = "nvidia,tegra210-admaif";
+            reg = <0x702d0000 0x800>;
+            dmas = <&adma 1>,  <&adma 1>,
+                   <&adma 2>,  <&adma 2>,
+                   <&adma 3>,  <&adma 3>,
+                   <&adma 4>,  <&adma 4>,
+                   <&adma 5>,  <&adma 5>,
+                   <&adma 6>,  <&adma 6>,
+                   <&adma 7>,  <&adma 7>,
+                   <&adma 8>,  <&adma 8>,
+                   <&adma 9>,  <&adma 9>,
+                   <&adma 10>, <&adma 10>;
+            dma-names = "rx1",  "tx1",
+                        "rx2",  "tx2",
+                        "rx3",  "tx3",
+                        "rx4",  "tx4",
+                        "rx5",  "tx5",
+                        "rx6",  "tx6",
+                        "rx7",  "tx7",
+                        "rx8",  "tx8",
+                        "rx9",  "tx9",
+                        "rx10", "tx10";
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                admaif1_port: port@0 {
+                    reg = <0x0>;
+                    admaif1_ep: endpoint {
+                        remote-endpoint = <&xbar_admaif1_ep>;
+                    };
+                };
+
+                // More ADMAIF ports to follow
+            };
+        };
+
+        i2s@702d1000 {
+            compatible = "nvidia,tegra210-i2s";
+            clocks = <&tegra_car TEGRA210_CLK_I2S0>;
+            clock-names = "i2s";
+            assigned-clocks = <&tegra_car TEGRA210_CLK_I2S0>;
+            assigned-clock-parents = <&tegra_car TEGRA210_CLK_PLL_A_OUT0>;
+            assigned-clock-rates = <1536000>;
+            reg = <0x702d1000 0x100>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0x0>;
+
+                    i2s1_cif_ep: endpoint {
+                        remote-endpoint = <&xbar_i2s1_ep>;
+                    };
+                };
+
+                i2s1_port: port@1 {
+                    reg = <0x1>;
+
+                    i2s1_dap: endpoint {
+                        dai-format = "i2s";
+                    };
+                };
+            };
+        };
+    };
+
+...