dt-bindings: sound: add rockchip i2s-tdm binding

This adds the YAML bindings for the Rockchip I2S/TDM audio driver.

Signed-off-by: Nicolas Frattaroli <frattaroli.nicolas@gmail.com>

Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.yaml

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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/rockchip,i2s-tdm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip I2S/TDM Controller
+
+description:
+  The Rockchip I2S/TDM Controller is a Time Division Multiplexed
+  audio interface found in various Rockchip SoCs, allowing up
+  to 8 channels of audio over a serial interface.
+
+maintainers:
+  - Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
+
+properties:
+  compatible:
+    enum:
+      - rockchip,px30-i2s-tdm
+      - rockchip,rk1808-i2s-tdm
+      - rockchip,rk3308-i2s-tdm
+      - rockchip,rk3568-i2s-tdm
+      - rockchip,rv1126-i2s-tdm
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  dmas:
+    minItems: 1
+    maxItems: 2
+
+  dma-names:
+    oneOf:
+      - const: rx
+      - items:
+          - const: tx
+          - const: rx
+
+  clocks:
+    items:
+      - description: clock for TX
+      - description: clock for RX
+      - description: clock for I2S bus
+
+  clock-names:
+    items:
+      - const: mclk_tx
+      - const: mclk_rx
+      - const: hclk
+
+  rockchip,frame-width:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 64
+    minimum: 32
+    maximum: 512
+    description:
+      Width of a frame, usually slot width multiplied by number of slots.
+      Must be even.
+
+  resets:
+    items:
+      - description: reset for TX
+      - description: reset for RX
+
+  reset-names:
+    items:
+      - const: tx-m
+      - const: rx-m
+
+  rockchip,cru:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      The phandle of the cru.
+      Required if both playback and capture are used, i.e. if rockchip,clk-trcm
+      is 0.
+
+  rockchip,grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      The phandle of the syscon node for the GRF register.
+
+  rockchip,mclk-calibrate:
+    description:
+      Enable mclk source calibration.
+    type: boolean
+
+  rockchip,trcm-sync:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Which lrck/bclk clocks each direction will sync to. You should use the
+      constants in <dt-bindings/sound/rockchip,i2s-tdm.h>
+    oneOf:
+      - const: 0
+        description:
+          RK_TRCM_TXRX. Use both the TX and the RX clock for TX and RX.
+      - const: 1
+        description:
+          RK_TRCM_TX. Use only the TX clock for TX and RX.
+      - const: 2
+        description:
+          RK_TRCM_RX. Use only the RX clock for TX and RX.
+
+  "#sound-dai-cells":
+    const: 0
+
+  rockchip,no-dmaengine:
+    description:
+      If present, driver will not register a pcm dmaengine, only the dai.
+      If the dai is part of multi-dais, the property should be present.
+    type: boolean
+
+  rockchip,playback-only:
+    description: Specify that the controller only has playback capability.
+    type: boolean
+
+  rockchip,capture-only:
+    description: Specify that the controller only has capture capability.
+    type: boolean
+
+  rockchip,i2s-rx-route:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Defines the mapping of I2S RX sdis to I2S data bus lines.
+      By default, they are mapped one-to-one.
+    items:
+      - description: which sdi to connect to data line 0
+      - description: which sdi to connect to data line 1
+      - description: which sdi to connect to data line 2
+      - description: which sdi to connect to data line 3
+
+  rockchip,i2s-tx-route:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Defines the mapping of I2S TX sdos to I2S data bus lines.
+      By default, they are mapped one-to-one.
+    items:
+      - description: which sdo to connect to data line 0
+      - description: which sdo to connect to data line 1
+      - description: which sdo to connect to data line 2
+      - description: which sdo to connect to data line 3
+
+  rockchip,tdm-fsync-half-frame:
+    description: Whether to use half frame fsync.
+    type: boolean
+
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - dmas
+  - dma-names
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - rockchip,grf
+  - "#sound-dai-cells"
+  - rockchip,trcm-sync
+
+allOf:
+  - if:
+      properties:
+        rockchip,clk-trcm:
+          contains:
+            enum: [0]
+    then:
+      required:
+        - rockchip,cru
+
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/rk3568-cru.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/pinctrl/rockchip.h>
+    #include <dt-bindings/sound/rockchip,i2s-tdm.h>
+
+
+    foo {
+        #address-cells = <2>;
+        #size-cells = <2>;
+        i2s@fe410000 {
+            compatible = "rockchip,rk3568-i2s-tdm";
+            reg = <0x0 0xfe410000 0x0 0x1000>;
+            interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>;
+            clocks = <&cru MCLK_I2S1_8CH_TX>, <&cru MCLK_I2S1_8CH_RX>,
+                     <&cru HCLK_I2S1_8CH>;
+            clock-names = "mclk_tx", "mclk_rx", "hclk";
+            dmas = <&dmac1 2>, <&dmac1 3>;
+            dma-names = "tx", "rx";
+            resets = <&cru SRST_M_I2S1_8CH_TX>, <&cru SRST_M_I2S1_8CH_RX>;
+            reset-names = "tx-m", "rx-m";
+            rockchip,trcm-sync = <RK_TRCM_TX>;
+            rockchip,cru = <&cru>;
+            rockchip,grf = <&grf>;
+            #sound-dai-cells = <0>;
+            pinctrl-names = "default";
+            pinctrl-0 =
+                <&i2s1m0_sclktx
+                &i2s1m0_sclkrx
+                &i2s1m0_lrcktx
+                &i2s1m0_lrckrx
+                &i2s1m0_sdi0
+                &i2s1m0_sdi1
+                &i2s1m0_sdi2
+                &i2s1m0_sdi3
+                &i2s1m0_sdo0
+                &i2s1m0_sdo1
+                &i2s1m0_sdo2
+                &i2s1m0_sdo3>;
+            status = "disabled";
+        };
+    };

include/dt-bindings/sound/rockchip,i2s-tdm.h

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+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _DT_BINDINGS_ROCKCHIP_I2S_TDM_H
+#define _DT_BINDINGS_ROCKCHIP_I2S_TDM_H
+
+#define RK_TRCM_TXRX 0
+#define RK_TRCM_TX 1
+#define RK_TRCM_RX 2
+
+#endif /* _DT_BINDINGS_ROCKCHIP_I2S_TDM_H */