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Subject[PATCH 01/10] dt-bindings: mfd: Add documentation for ad242x
Date
This patch adds documentation on the top-level MFD support for AD242x
devices. The bindings implemented by drivers for sub-devices of the
MFD are documented in other files in their respective subsystems.

The example in this file is referred to by other documents.

Signed-off-by: Daniel Mack <daniel@zonque.org>
---
.../bindings/mfd/adi,ad242x-bus.yaml | 29 +++
.../bindings/mfd/adi,ad242x-master.yaml | 235 ++++++++++++++++++
.../bindings/mfd/adi,ad242x-slave.yaml | 108 ++++++++
3 files changed, 372 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/adi,ad242x-bus.yaml
create mode 100644 Documentation/devicetree/bindings/mfd/adi,ad242x-master.yaml
create mode 100644 Documentation/devicetree/bindings/mfd/adi,ad242x-slave.yaml

diff --git a/Documentation/devicetree/bindings/mfd/adi,ad242x-bus.yaml b/Documentation/devicetree/bindings/mfd/adi,ad242x-bus.yaml
new file mode 100644
index 000000000000..89ca8d009bb9
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/adi,ad242x-bus.yaml
@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/mfd/adi,ad242x-bus.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Analog Devices AD242x A²B bus node
+
+maintainers:
+ - Daniel Mack <daniel@zonque.org>
+
+description: |
+ AD242x slave nodes represent the secondary I²C address a master node
+ transceiver exposes on the bus.
+
+properties:
+ compatible:
+ enum:
+ - adi,ad2428w-bus
+
+ reg:
+ maxItems: 1
+ description: |
+ The secondary I²C address of the master node
+ (called 'BUS' in the datasheet)
+
+required:
+ - compatible
+ - reg
diff --git a/Documentation/devicetree/bindings/mfd/adi,ad242x-master.yaml b/Documentation/devicetree/bindings/mfd/adi,ad242x-master.yaml
new file mode 100644
index 000000000000..649510575a79
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/adi,ad242x-master.yaml
@@ -0,0 +1,235 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/mfd/adi,ad242x-master.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Analog Devices AD242x A²B master node transceiver
+
+maintainers:
+ - Daniel Mack <daniel@zonque.org>
+
+description: |
+ AD242x devices are A²B (Automotive Audio Bus) transceivers that are connected
+ to each other in a daisy-chain. The payload transported on that bus includes
+ multi-channel audio, I²C, GPIOs and others.
+
+ The datasheet is located here:
+
+ https://www.analog.com/media/en/technical-documentation/user-guides/AD242x_TRM_Rev1.1.pdf
+
+ The primary node in the chain is called the master node, and the nodes in the
+ chain are called slave nodes. A master can address up to 15 slave nodes. The
+ master node exposes two I²C addresses, one for accessing the registers on the
+ node itself, and one for registers on one of the slave nodes.
+
+properties:
+ compatible:
+ enum:
+ - adi,ad2428w-master
+
+ reg:
+ maxItems: 1
+ description: |
+ The primary I²C address of the master node
+ (called 'BASE' in the datasheet)
+
+ clocks:
+ minItems: 1
+
+ clock-names:
+ $ref: /schemas/types.yaml#/definitions/string-array
+ const: sync
+
+ clock-frequency:
+ $ref: '/schemas/types.yaml#/definitions/uint32'
+ enum: [44100, 48000]
+ description: |
+ Specifies the clock frequency in Hz to configure on the given sync clock.
+ If not specified, the clock is expected to already be configured to either
+ 44100 or 48000 Hz.
+
+ interrupts:
+ maxItems: 1
+
+ adi,a2b-bus:
+ $ref: '/schemas/types.yaml#/definitions/phandle'
+ description: Specifies the bus handle node
+
+ adi,upstream-slot-size:
+ description: The size for upstream slots
+ allOf:
+ - $ref: '/schemas/types.yaml#/definitions/uint32'
+ - enum: [8, 12, 16, 20, 24, 28, 32]
+
+ adi,downstream-slot-size:
+ description: The size for downstream slots
+ allOf:
+ - $ref: '/schemas/types.yaml#/definitions/uint32'
+ - enum: [8, 12, 16, 20, 24, 28, 32]
+
+ adi,tdm-mode:
+ description: The TDM mode to use
+ allOf:
+ - $ref: '/schemas/types.yaml#/definitions/uint32'
+ - enum: [2, 4, 8, 12, 16, 20, 24, 32]
+
+ adi,tdm-slot-size:
+ description: The TDM slot size to use
+ allOf:
+ - $ref: '/schemas/types.yaml#/definitions/uint32'
+ - enum: [16, 32]
+
+ adi,alternate-upstream-slot-format:
+ description: Selects the alternate format for upstream slots
+ type: boolean
+
+ adi,alternate-downstream-slot-format:
+ description: Selects the alternate format for downstream slots
+ type: boolean
+
+ adi,invert-xcvr-b:
+ description: Inverts the LVDS XCVR B data line
+ type: boolean
+
+ adi,alternating-sync:
+ description: Drives the SYNC pin for I²S operation
+ type: boolean
+
+ adi,invert-sync:
+ description: Invert the SYNC pin
+ type: boolean
+
+ adi,early-sync:
+ description: |
+ Make the SYNC pin change one cycle before the first slot is transmitted
+ type: boolean
+
+ adi,spread-a2b-clock:
+ description: Enables spread spectrum mode for A²B bus clocks
+ type: boolean
+
+ adi,spread-a2b-i2s-clock:
+ description: Enables spread spectrum mode for both A²B and I²S clocks
+ type: boolean
+
+ adi,spread-spectrum-high:
+ description: Selects high spectrum spreading mode
+ type: boolean
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - clock-names
+ - adi,a2b-bus
+ - adi,upstream-slot-size
+ - adi,downstream-slot-size
+ - adi,tdm-mode
+ - adi,tdm-slot-size
+
+examples:
+ - |
+ sync_clock: clock {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <48000>;
+ };
+
+ i2c-bus {
+ ad2428w-master@68 {
+ reg = <0x68>;
+ compatible = "adi,ad2428w-master";
+ adi,a2b-bus = <&a2b_bus>;
+ clocks = <&sync_clock>;
+ clock-names = "sync";
+
+ adi,upstream-slot-size = <24>;
+ adi,downstream-slot-size = <24>;
+ adi,tdm-mode = <2>;
+ adi,tdm-slot-size = <32>;
+ adi,alternating-sync;
+ adi,early-sync;
+
+ codec {
+ compatible = "adi,ad2428w-codec";
+ #sound-dai-cells = <1>;
+ };
+
+ clock {
+ compatible = "adi,ad2428w-clk";
+ #clock-cells = <1>;
+ clock-output-names = "master-clk1", "master-clk2";
+ };
+
+ nodes {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ node@0 {
+ compatible = "adi,ad2428w-slave";
+ reg = <0>;
+
+ adi,alternating-sync;
+ adi,early-sync;
+ adi,invert-sync;
+ adi,tdm-mode = <8>;
+ adi,tdm-slot-size = <32>;
+
+ downstream {
+ rx-slots = <2 3 6 7 8 9>;
+ #tx-slots = <4>;
+ #forward-slots = <6>;
+ };
+
+ upstream {
+ rx-slots = <0 1 6 7 8 9>;
+ #tx-slots = <4>;
+ #forward-slots = <6>;
+ };
+
+ a2bgpio: gpio {
+ compatible = "adi,ad2428w-gpio";
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ gpio-over-distance {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ pin@0 {
+ reg = <0>;
+ adi,virtual-port-mask = <0x01>;
+ };
+ };
+ };
+
+ i2c {
+ compatible = "adi,ad2428w-i2c";
+ clock-frequency = <400000>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ // I²C client devices located on the remote side
+ eeprom-top@52 {
+ reg = <0x52>;
+ compatible = "atmel,24c02";
+ read-only;
+ };
+ };
+
+ a2bclk: clock {
+ compatible = "adi,ad2428w-clk";
+ #clock-cells = <1>;
+ clock-output-names = "node0-clk1", "node0-clk2";
+ };
+
+ codec {
+ compatible = "adi,ad2428w-codec";
+ #sound-dai-cells = <1>;
+ adi,pdm-highpass-filter;
+ };
+ };
+ };
+ };
+ };
diff --git a/Documentation/devicetree/bindings/mfd/adi,ad242x-slave.yaml b/Documentation/devicetree/bindings/mfd/adi,ad242x-slave.yaml
new file mode 100644
index 000000000000..3bea04dff267
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/adi,ad242x-slave.yaml
@@ -0,0 +1,108 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/mfd/adi,ad242x-slave.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Analog Devices AD242x A²B slave node transceiver
+
+maintainers:
+ - Daniel Mack <daniel@zonque.org>
+
+description: |
+ AD242x slave nodes are connected to the master node through a daisy-chain.
+ Modules of this type must be listed under the 'nodes' property of the master
+ DT schema.
+
+properties:
+ compatible:
+ enum:
+ - adi,ad2428w-slave
+
+ adi,tdm-mode:
+ description: The TDM mode to use
+ allOf:
+ - $ref: '/schemas/types.yaml#/definitions/uint32'
+ - enum: [2, 4, 8, 12, 16, 20, 24, 32]
+
+ adi,tdm-slot-size:
+ description: The TDM slot size to use
+ allOf:
+ - $ref: '/schemas/types.yaml#/definitions/uint32'
+ - enum: [16, 32]
+
+ adi,alternating-sync:
+ description: Drives the SYNC pin for I²S operation
+ type: boolean
+
+ adi,invert-sync:
+ description: Invert the SYNC pin
+ type: boolean
+
+ adi,early-sync:
+ description: |
+ Make the SYNC pin change one cycle before the first slot is transmitted
+ type: boolean
+
+ adi,spread-a2b-clock:
+ description: Enables spread spectrum mode for A²B bus clocks
+ type: boolean
+
+ adi,spread-a2b-i2s-clock:
+ description: Enables spread spectrum mode for both A²B and I²S clocks
+ type: boolean
+
+ adi,spread-spectrum-high:
+ description: Selects high spectrum spreading mode
+ type: boolean
+
+ upstream:
+ type: object
+ properties:
+ rx-slots:
+ $ref: '/schemas/types.yaml#/definitions/uint32'
+ description: |
+ A bitmask that describes the slots that are received by the
+ transceiver from the upstream (A) side and put into its TX output
+ framebuffers. If not specified, an empty bitmask is assumed.
+
+ '#tx-slots':
+ $ref: '/schemas/types.yaml#/definitions/uint32'
+ description: |
+ The number of slots this transceiver contributes to the upstream
+ traffic from its RX input frame buffer
+
+ '#forward-slots':
+ $ref: '/schemas/types.yaml#/definitions/uint32'
+ description: |
+ The number of slots this transceiver forwards from the upstream side
+ to the downstream side.
+
+ downstream:
+ type: object
+ properties:
+ rx-slots:
+ $ref: '/schemas/types.yaml#/definitions/uint32'
+ description: |
+ A bitmask that describes the slots that are received by the
+ transceiver from the downstream (B) side and put into its TX output
+ framebuffers. If not specified, an empty bitmask is assumed.
+
+ '#tx-slots':
+ $ref: '/schemas/types.yaml#/definitions/uint32'
+ description: |
+ The number of slots this transceiver contributes to the downstream
+ traffic from its RX input frame buffer
+
+ '#forward-slots':
+ $ref: '/schemas/types.yaml#/definitions/uint32'
+ description: |
+ The number of slots this transceiver forwards from the downstream side
+ to the upstream side.
+
+required:
+ - compatible
+ - adi,tdm-mode
+ - adi,tdm-slot-size
+ - upstream
+ - downstream
--
2.23.0
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