Re: [PATCH 03/13] dt-bindings: a2b: Analog Devices AD24xx devices

Krzysztof Kozlowski
2024-05-19T11:40:35Z

On 17/05/2024 14:58, Alvin Šipraga wrote:
> From: Alvin Šipraga <alsi@bang-olufsen.dk>
>
> Add device tree bindings for the AD24xx series A2B transceiver chips,
> including their functional blocks.
>
> Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk>
> ---
> .../devicetree/bindings/a2b/adi,ad24xx-clk.yaml | 53 +++++

What is a2b and why clock bindings are not in clock?

> .../devicetree/bindings/a2b/adi,ad24xx-codec.yaml | 52 +++++
> .../devicetree/bindings/a2b/adi,ad24xx-gpio.yaml | 76 +++++++
> .../devicetree/bindings/a2b/adi,ad24xx-i2c.yaml | 55 +++++
> .../devicetree/bindings/a2b/adi,ad24xx.yaml | 253 +++++++++++++++++++++

Sorry, all this looks weirdly placed.

> 5 files changed, 489 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/a2b/adi,ad24xx-clk.yaml b/Documentation/devicetree/bindings/a2b/adi,ad24xx-clk.yaml
> new file mode 100644
> index 000000000000..819efaa6a3f9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/a2b/adi,ad24xx-clk.yaml
> @@ -0,0 +1,53 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/a2b/adi,ad24xx-clk.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices Inc. AD24xx clock functional block
> +
> +maintainers:
> + - Alvin Šipraga <alsi@bang-olufsen.dk>
> +
> +allOf:
> + - $ref: /schemas/clock/clock.yaml

Drop. There is no single binding doing this, which is usually a hint you
do something not correct.

> +
> +properties:
> + compatible:
> + enum:
> + - adi,ad2420-clk
> + - adi,ad2421-clk
> + - adi,ad2422-clk
> + - adi,ad2425-clk
> + - adi,ad2426-clk
> + - adi,ad2427-clk
> + - adi,ad2428-clk
> + - adi,ad2429-clk
> +

This is just incomplete. See other bindings how clock controller is written.

> +required:
> + - compatible
> + - clock-output-names
> +
> +unevaluatedProperties: false

additionalProperties: false
> +
> +examples:
> + - |
> + a2b {
> + #address-cells = <1>;
> + #size-cells = <0>;

Not related, drop entire node.

> +
> + node@1 {
> + compatible = "adi,ad2425-node";

Not related, drop entire node.

> + reg = <1>;
> + interrupts = <1>;
> + adi,tdm-mode = <16>;
> + adi,tdm-slot-size = <32>;
> +
> + clock {
> + compatible = "adi,ad2425-clk";
> + #clock-cells = <1>;
> + clock-indices = <1>;
> + clock-output-names = "A2B1 CLKOUT2";
> + };
> + };
> + };
> diff --git a/Documentation/devicetree/bindings/a2b/adi,ad24xx-codec.yaml b/Documentation/devicetree/bindings/a2b/adi,ad24xx-codec.yaml
> new file mode 100644
> index 000000000000..eee12f1c810e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/a2b/adi,ad24xx-codec.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/a2b/adi,ad24xx-codec.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices Inc. AD24xx I2S/TDM functional block
> +
> +maintainers:
> + - Alvin Šipraga <alsi@bang-olufsen.dk>
> +
> +allOf:
> + - $ref: /schemas/sound/dai-common.yaml#

Why full path? It's the same directory, isn't it?

> +
> +properties:
> + compatible:
> + enum:
> + - adi,ad2403-codec
> + - adi,ad2410-codec
> + - adi,ad2425-codec
> + - adi,ad2428-codec
> + - adi,ad2429-codec
> +
> + '#sound-dai-cells':
> + const: 0
> +
> +required:
> + - compatible
> + - '#sound-dai-cells'
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + a2b {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + node@2 {
> + compatible = "adi,ad2428-node";
> + reg = <2>;
> + interrupts = <2>;
> + adi,tdm-mode = <8>;
> + adi,tdm-slot-size = <32>;

Same comments. Limited review follows.

...

> +
> +required:
> + - compatible
> +
> +unevaluatedProperties: false

Sorry, but not. No resources, nothing here. Do not create bindings just
to instantiate drivers.

...

> diff --git a/Documentation/devicetree/bindings/a2b/adi,ad24xx.yaml b/Documentation/devicetree/bindings/a2b/adi,ad24xx.yaml
> new file mode 100644
> index 000000000000..dcda15e8032a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/a2b/adi,ad24xx.yaml
> @@ -0,0 +1,253 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/a2b/adi,ad24xx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices Inc. AD24xx Automotive Audio Bus A2B Transceiver
> +
> +description: |
> + AD24xx chips provide A2B bus functionality together with several peripheral

What is A2B?

> + functions, including GPIO, I2S/TDM, an I2C controller interface, and
> + programmable clock outputs.
> +
> +maintainers:
> + - Alvin Šipraga <alsi@bang-olufsen.dk>
> +
> +properties:
> + compatible:
> + enum:
> + - adi,ad2403
> + - adi,ad2410
> + - adi,ad2425
> + - adi,ad2428
> + - adi,ad2429
> +

reg: is second property.

> + reg-names:
> + items:
> + - const: base
> + - const: bus
> +
> + reg:
> + items:
> + - description: Normal I2C address of the chip
> + - description: Auxiliary BUS_ADDR I2C address of the chip
> +
> + '#address-cells':
> + const: 1
> +
> + '#size-cells':
> + const: 0
> +
> + clock-names:
> + items:
> + - const: sync

Again misordered. -names always follow main entry. Anyway, clock-names
for just one entry is not really useful.

> +
> + clocks:
> + items:
> + - description: SYNC input pin clock source
> +
> + vin-supply:
> + description: Optional regulator for supply voltage to VIN pin
> +
> + bus-supply:
> + description: Optional regulator for out-of-band supply voltage to
> + subodrinate nodes' VIN pins
> +
> + interrupts: true

??? This must be specific.

> +
> + interrupt-controller: true
> +
> + '#interrupt-cells':
> + const: 1
> +
> +patternProperties:
> + '^node@[0-9]+$':
> + type: object
> + unevaluatedProperties: false

Why? This must be additionalProperties: false, or I miss something...

> +
> + properties:
> + compatible:
> + enum:
> + - adi,ad2401-node
> + - adi,ad2402-node
> + - adi,ad2403-node
> + - adi,ad2410-node
> + - adi,ad2420-node
> + - adi,ad2421-node
> + - adi,ad2422-node
> + - adi,ad2425-node
> + - adi,ad2426-node
> + - adi,ad2427-node
> + - adi,ad2428-node
> + - adi,ad2429-node
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + interrupt-controller: true
> +
> + '#interrupt-cells':
> + const: 1
> +
> + gpio:
> + $ref: adi,ad24xx-gpio.yaml#
> +
> + codec:
> + $ref: adi,ad24xx-codec.yaml#
> +
> + i2c:
> + $ref: adi,ad24xx-i2c.yaml#
> +
> + clock:
> + $ref: adi,ad24xx-clk.yaml#
> +
> + adi,tdm-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: TDM mode

Please do not add descriptions which are copies of property name. You
basically said ZERO here. Say something useful...

> + enum: [2, 4, 8, 12, 16, 20, 24, 32]
> +
> + adi,tdm-slot-size:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: TDM slot size
> + enum: [16, 32]
> +
> + adi,invert-sync:
> + description: Falling edge of SYNC pin indicates the start of an audio
> + frame, as opposed to rising edge.
> + type: boolean
> +
> + adi,early-sync:
> + description: The SYNC pin changes one cycle before the MSB of the first
> + data slot.
> + type: boolean
> +
> + adi,alternating-sync:
> + description: Drive SYNC pin during first half of I2S/TDM data
> + transmission rather than just pulsing it for once cycle.
> + type: boolean
> +
> + adi,rx-on-dtx1:
> + description: Use the DTX1 pin for I2S/TDM RX in place of the DRX1 pin.
> + type: boolean
> +
> + adi,a2b-external-switch-mode-1:
> + description: Use external switch mode 1 instead of 0 on the assumption
> + that the downstream node is not using A2B bus power.
> + type: boolean
> +
> + adi,drive-strength:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: Configures drive strength low (0) or high (1, default).
> + enum: [0, 1]
> + default: 1
> +
> + adi,invert-interrupt:
> + description: Invert polarity of IRQ pin, making it active low.
> + type: boolean
> +
> + adi,tristate-interrupt:
> + description: Rather than always actively driving the IRQ pin, only drive
> + when the interrupt is active and otherwise set to tristate (high-Z).
> + type: boolean

It looks you put all children properties into parent node... With so
little explanation tricky to judge.

> +
> + required:
> + - compatible
> + - reg
> + - adi,tdm-mode
> + - adi,tdm-slot-size
> +
> + dependencies:
> + interrupt-controller: [ '#interrupt-cells' ]
> + '#interrupt-cells': [ interrupt-controller ]
> +
> +required:
> + - compatible
> + - reg-names
> + - reg
> + - clock-names
> + - clocks
> + - '#address-cells'
> + - '#size-cells'
> + - interrupts
> + - interrupt-controller
> + - '#interrupt-cells'
> + - node@0
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + sync_clk: sync-clock {

Drop, not related.

> + compatible = "fixed-clock";
> + #clock-cells = <0>;
> + clock-frequency = <48000>;
> + };
> +
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + a2b@68 {
> + compatible = "adi,ad2428";
> + reg-names = "base", "bus";
> + reg = <0x68>, <0x69>;

Please follow DTS coding style. Do not introduce entire different style
and order of properties. reg-names IS NEVER the second property.

Best regards,
Krzysztof