ASoC: dt-bindings: rockchip: add i2s-tdm bindings

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

Signed-off-by: Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211001171531.178775-3-frattaroli.nicolas@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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

@@ -0,0 +1,198 @@
+# 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:
+    minItems: 1
+    maxItems: 2
+    items:
+      enum:
+        - rx
+        - tx
+
+  clocks:
+    minItems: 3
+    items:
+      - description: clock for TX
+      - description: clock for RX
+      - description: AHB clock driving the interface
+      - description:
+          Parent clock for mclk_tx (only required when using mclk-calibrate)
+      - description:
+          Parent clock for mclk_rx (only required when using mclk-calibrate)
+      - description:
+          Clock for sample rates that are an integer multiple of 8000
+          (only required when using mclk-calibrate)
+      - description:
+          Clock for sample rates that are an integer multiple of 11025
+          (only required when using mclk-calibrate)
+
+  clock-names:
+    minItems: 3
+    items:
+      - const: mclk_tx
+      - const: mclk_rx
+      - const: hclk
+      - const: mclk_tx_src
+      - const: mclk_rx_src
+      - const: mclk_root0
+      - const: mclk_root1
+
+  resets:
+    minItems: 1
+    maxItems: 2
+    description: resets for the tx and rx directions
+
+  reset-names:
+    minItems: 1
+    maxItems: 2
+    items:
+      enum:
+        - tx-m
+        - rx-m
+
+  rockchip,cru:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      The phandle of the cru.
+      Required if neither trcm-sync-tx-only nor trcm-sync-rx-only are specified.
+
+  rockchip,grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      The phandle of the syscon node for the GRF register.
+
+  rockchip,trcm-sync-tx-only:
+    type: boolean
+    description: Use TX BCLK/LRCK for both TX and RX.
+
+  rockchip,trcm-sync-rx-only:
+    type: boolean
+    description: Use RX BCLK/LRCK for both TX and RX.
+
+  "#sound-dai-cells":
+    const: 0
+
+  rockchip,i2s-rx-route:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      Defines the mapping of I2S RX sdis to I2S data bus lines.
+      By default, they are mapped one-to-one.
+      rockchip,i2s-rx-route = <3> would mean sdi3 is receiving from data0.
+    maxItems: 4
+    items:
+      - enum: [0, 1, 2, 3]
+
+  rockchip,i2s-tx-route:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      Defines the mapping of I2S TX sdos to I2S data bus lines.
+      By default, they are mapped one-to-one.
+      rockchip,i2s-tx-route = <3> would mean sdo3 is sending to data0.
+    maxItems: 4
+    items:
+      - enum: [0, 1, 2, 3]
+
+  rockchip,io-multiplex:
+    description:
+      Specify that the GPIO lines on the I2S bus are multiplexed such that
+      the direction (input/output) needs to be dynamically adjusted.
+    type: boolean
+
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - dmas
+  - dma-names
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - rockchip,grf
+  - "#sound-dai-cells"
+
+allOf:
+  - if:
+      properties:
+        rockchip,trcm-sync-tx-only: false
+        rockchip,trcm-sync-rx-only: false
+    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>
+
+    bus {
+        #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 3>, <&dmac1 2>;
+            dma-names = "rx", "tx";
+            resets = <&cru SRST_M_I2S1_8CH_TX>, <&cru SRST_M_I2S1_8CH_RX>;
+            reset-names = "tx-m", "rx-m";
+            rockchip,trcm-sync-tx-only;
+            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>;
+        };
+    };

MAINTAINERS

@@ -16112,6 +16112,7 @@ ROCKCHIP I2S TDM DRIVER
 M:	Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
 L:	linux-rockchip@lists.infradead.org
 S:	Maintained
+F:	Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.yaml
 F:	sound/soc/rockchip/rockchip_i2s_tdm.*
 
 ROCKCHIP ISP V1 DRIVER