Re: [PATCH v3 1/5] dt-bindings: i2c: qcom,i2c-cci: Add Hawi compatible

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Medium] dt-bindings: i2c: qcom,hawi-cci falls back to qcom,msm8996-cci
--

commit d9dc73bf069c6c548fe2a696e7ecbd69ab96e3f3
Author: Hangxiang Ma <hangxiang.ma@oss.qualcomm.com>

dt-bindings: i2c: qcom,i2c-cci: Add Hawi compatible

This commit documents the Camera Control Interface (CCI) compatible string
qcom,hawi-cci for the Qualcomm Hawi platform and adds it to the two-clock
constraint list in Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml.

> diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml
> index 1e8def25ec0ec..b2b4d4bcf7807 100644
> --- a/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml
> +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml
> @@ -27,6 +27,7 @@ properties:
>        - items:
>            - enum:
>                - qcom,glymur-cci
> +              - qcom,hawi-cci
>                - qcom,kaanapali-cci
>                - qcom,milos-cci
>                - qcom,qcm2290-cci

[Severity: Medium]
As reported by Loic Poulain on v1 [1], adding qcom,hawi-cci to this enum list
under properties:compatible in
Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml requires device tree
nodes to specify qcom,msm8996-cci as a fallback compatible:

      - items:
          - enum:
              - qcom,glymur-cci
              - qcom,hawi-cci
              ...
          - const: qcom,msm8996-cci # CCI v2

When a Hawi CCI controller node is probed via cci_probe() in
drivers/i2c/busses/i2c-qcom-cci.c, device_get_match_data() matches the
fallback entry in cci_dt_match[] and binds the controller to the legacy
cci_v2_data configuration:

static const struct cci_data cci_v2_data = {
	.num_masters = 2,
	.queue_size = { 64, 16 },
	.quirks = {
		.max_write_len = 11,
		.max_read_len = 12,
	},
	.max_mode = I2C_MODE_FAST_PLUS,
};

static const struct of_device_id cci_dt_match[] = {
	...
	{ .compatible = "qcom,msm8996-cci", .data = &cci_v2_data},

Since newer CCI IP revisions have different hardware resources such as FIFO
and queue sizes, should qcom,hawi-cci stop falling back to qcom,msm8996-cci
and instead use a dedicated variant entry rather than reusing the msm8996
definition?

[1] https://lore.kernel.org/r/CAFEp6-1Zvt0hhBd7LNx2hsyi9J+bxCT8EWN3jZ4B30SO58SCow@mail.gmail.com

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Sashiko AI review · https://sashiko.dev/#/patchset/20261030-hawi-maili-camss-v3-0-9742bca8cef2@oss.qualcomm.com?part=1

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