Re: [PATCH v8 04/12] mfd: zx297520v3: Add a clock and reset MFD driver

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Medium] Platform data for child devices (`mfd_cell` arrays) is improperly passed as complex pointers via the `.data` field of the `of_device_id` match table.
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--- Patch [4]: [PATCH v8 04/12] mfd: zx297520v3: Add a clock and reset MFD driver ---
commit 997b3ee44abc6ec239c36327d1c3fd90393542dd
Author: Stefan Dösinger <stefandoesinger@gmail.com>

mfd: zx297520v3: Add a clock and reset MFD driver

This driver registers child devices for the zx297520v3 clock and reset
controllers. The clk-zx297520v3 and reset-zte-zx297520v3 submitted in
the next patches will drive the respective functionalities.

> diff --git a/drivers/mfd/zte-zx297520v3-crm.c b/drivers/mfd/zte-zx297520v3-crm.c
> new file mode 100644
> index 0000000000000..3a4f6cd0756e3
> --- /dev/null
> +++ b/drivers/mfd/zte-zx297520v3-crm.c

[ ... ]

> +static int zx297520v3_crm_probe(struct platform_device *pdev)
> +{
> +	const struct zx297520v3_crm_data *data;
> +
> +	data = of_device_get_match_data(&pdev->dev);
> +	if (!data)
> +		return -ENODEV;
> +
> +	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, data->cells,
> +				    data->num_cells, NULL, 0, NULL);
> +}
> +
> +static const struct of_device_id of_match_zx297520v3_crm[] = {
> +	{ .compatible = "zte,zx297520v3-topcrm", .data = &zx297520v3_topcrm_data },
> +	{ .compatible = "zte,zx297520v3-matrixcrm", .data = &zx297520v3_matrixcrm_data },
> +	{ .compatible = "zte,zx297520v3-lspcrm", .data = &zx297520v3_lspcrm_data },

[Severity: Medium]
Does passing platform data for child devices via the .data field as complex
pointers violate MFD subsystem architecture guidelines?

Instead of mapping compatible strings directly to zx297520v3_crm_data pointers
via the .data field, should this use an ID enum or integer ID, and have
zx297520v3_crm_probe() switch on the ID to select the correct static const
mfd_cell array?

> +	{ }
> +};

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260727-zx29clk-v8-0-7a107b00f1dd@gmail.com?part=4