linux-kernel - Re: [PATCH v3] dt-bindings: soundwire: Convert text bindings to DT Schema

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Message-ID: <77087a4a-ac21-c622-59ec-1b308c37cc2c@linaro.org>
Date:   Thu, 20 Oct 2022 14:34:52 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        vkoul@...nel.org, agross@...nel.org, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, quic_plai@...cinc.com,
        bgoswami@...cinc.com, perex@...ex.cz, tiwai@...e.com,
        srinivas.kandagatla@...aro.org, quic_rohkumar@...cinc.com,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        swboyd@...omium.org, judyhsiao@...omium.org
Cc:     Ratna Deepthi Kudaravalli <quic_rkudarav@...cinc.com>
Subject: Re: [PATCH v3] dt-bindings: soundwire: Convert text bindings to DT
 Schema

On 20/10/2022 09:06, Srinivasa Rao Mandadapu wrote:
> Convert soundwire text bindings to DT Schema format.
> 
> Update interrupt property items as per device tree,
> as it is not appropriately described in text file.
> 
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
> Co-developed-by: Ratna Deepthi Kudaravalli <quic_rkudarav@...cinc.com>
> Signed-off-by: Ratna Deepthi Kudaravalli <quic_rkudarav@...cinc.com>
> ---

Thank you for your patch. There is something to discuss/improve.

> -};
> diff --git a/Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml b/Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml
> new file mode 100644
> index 0000000..12cd3c1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml
> @@ -0,0 +1,184 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soundwire/qcom,soundwire.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm SoundWire Controller
> +
> +maintainers:
> +  - Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> +  - Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
> +
> +description:
> +  The Qualcomm SoundWire controller along with its board specific bus parameters.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,soundwire-v1.3.0
> +      - qcom,soundwire-v1.5.0
> +      - qcom,soundwire-v1.5.1
> +      - qcom,soundwire-v1.6.0
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    items:
> +      - description: specify the SoundWire controller core.
> +      - description: specify the Soundwire controller wake IRQ.

The second property was optional. You need to test DTS before sending
the bindings. Please run `make dtbs_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).

IOW, you need here:
  minItems: 1

> +
> +  interrupt-names:

  minItems: 1

> +    items:
> +      - const: wakeup
> +      - const: core

That's definitely wrong order and should not pass any tests...

> +
> +  clocks:
> +    items:
> +      - description: iface clock
> +
> +  clock-names:
> +    items:
> +      - const: iface
> +
> +  resets:
> +    items:
> +      - description: SWR_AUDIO_CGCR RESET
> +
> +  reset-names:
> +    items:
> +      - const: swr_audio_cgcr
> +
> +  '#sound-dai-cells':
> +    const: 1
> +
> +  '#address-cells':
> +    const: 2
> +
> +  '#size-cells':
> +    const: 0
> +
> +  wakeup-source: true
> +
> +  qcom,din-ports:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: count of data in ports
> +
> +  qcom,dout-ports:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: count of data out ports
> +
> +  qcom,ports-word-length:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: size of payload channel sample.
> +    maxItems: 5
> +
> +  qcom,ports-sinterval-low:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: sample interval low of each data port.
> +    maxItems: 5
> +
> +  qcom,ports-offset1:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: payload transport window offset1 of each data port.

You miss here some pieces of original description,

> +    maxItems: 5
> +
> +  qcom,ports-offset2:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: payload transport window offset2 of each data port.

Ditto - and in other places.

> +    maxItems: 5
> +
> +  qcom,ports-lane-control:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: identify which data lane the data port uses.
> +    maxItems: 5
> +
> +  qcom,ports-block-pack-mode:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: indicate the block packing mode.
> +    maxItems: 5
> +
> +  qcom,ports-hstart:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: identifying lowerst numbered coloum in SoundWire frame.
> +    maxItems: 5
> +
> +  qcom,ports-hstop:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: identifying highest numbered coloum in SoundWire frame.
> +    maxItems: 5
> +
> +  qcom,ports-block-group-count:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: indicate how many sample intervals are combined into a payload.
> +    maxItems: 5
> +
> +  codec@4:

It's too specific. What if different device uses different address?

You need patternProperties "^codec@[0-9a-f]+$"


> +    $ref: ../sound/qcom,wcd938x-sdw.yaml#

Full path, so /schemas/sound/qcom,wcd.....

Cannot we have other codecs attached? For example check SC7280 IDP,
SM8250 MTP, RB5.


> +    description:
> +      Qualcomm WCD9380/WCD9385 Codec is a standalone Hi-Fi audio codec IC.
> +      It has RX and TX Soundwire slave devices. This bindings is for the
> +      slave devices.
> +    type: object
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - '#sound-dai-cells'
> +  - '#address-cells'
> +  - '#size-cells'
> +  - qcom,dout-ports
> +  - qcom,din-ports
> +  - qcom,ports-sinterval-low
> +  - qcom,ports-offset1
> +  - qcom,ports-offset2
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/clock/qcom,lpassaudiocc-sc7280.h>
> +
> +    soundwire@...0000 {
> +        compatible = "qcom,soundwire-v1.6.0";
> +        reg = <0x03210000 0x2000>;
> +
> +        interrupts = <GIC_SPI 155 IRQ_TYPE_LEVEL_HIGH>,
> +                     <&pdc 130 IRQ_TYPE_LEVEL_HIGH>;
> +

Missing interrupt names.

Best regards,
Krzysztof