linux-kernel - Re: [PATCH 01/28] mfd: Add Microchip ZL3073x support

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Message-ID: <9b38d033-72aa-4fb0-b1ee-41bbe3884040@kernel.org>
Date: Mon, 7 Apr 2025 19:53:53 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Ivan Vecera <ivecera@...hat.com>, netdev@...r.kernel.org
Cc: Michal Schmidt <mschmidt@...hat.com>,
 Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
 Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
 Jiri Pirko <jiri@...nulli.us>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Prathosh Satish <Prathosh.Satish@...rochip.com>,
 Lee Jones <lee@...nel.org>, Kees Cook <kees@...nel.org>,
 Andy Shevchenko <andy@...nel.org>, Andrew Morton
 <akpm@...ux-foundation.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 01/28] mfd: Add Microchip ZL3073x support

On 07/04/2025 19:28, Ivan Vecera wrote:
> This adds base MFD driver for Microchip Azurite ZL3073x chip family.

Please do not use "This commit/patch/change", but imperative mood. See
longer explanation here:
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

> These chips provide DPLL and PHC (PTP) functionality and they can
> be connected over I2C or SPI bus.
> 

...

> +/**
> + * zl3073x_get_regmap_config - return pointer to regmap config
> + *
> + * Returns pointer to regmap config
> + */
> +const struct regmap_config *zl3073x_get_regmap_config(void)
> +{
> +	return &zl3073x_regmap_config;
> +}
> +EXPORT_SYMBOL_NS_GPL(zl3073x_get_regmap_config, "ZL3073X");
> +
> +struct zl3073x_dev *zl3073x_dev_alloc(struct device *dev)
> +{
> +	struct zl3073x_dev *zldev;
> +
> +	return devm_kzalloc(dev, sizeof(*zldev), GFP_KERNEL);
> +}
> +EXPORT_SYMBOL_NS_GPL(zl3073x_dev_alloc, "ZL3073X");
> +
> +int zl3073x_dev_init(struct zl3073x_dev *zldev)
> +{
> +	devm_mutex_init(zldev->dev, &zldev->lock);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_NS_GPL(zl3073x_dev_init, "ZL3073X");
> +
> +void zl3073x_dev_exit(struct zl3073x_dev *zldev)
> +{
> +}
> +EXPORT_SYMBOL_NS_GPL(zl3073x_dev_exit, "ZL3073X");

Why do you add empty exports?



> diff --git a/drivers/mfd/zl3073x-spi.c b/drivers/mfd/zl3073x-spi.c
> new file mode 100644
> index 0000000000000..a6b9a366a7585
> --- /dev/null
> +++ b/drivers/mfd/zl3073x-spi.c
> @@ -0,0 +1,71 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/spi/spi.h>
> +#include "zl3073x.h"
> +
> +static const struct spi_device_id zl3073x_spi_id[] = {
> +	{ "zl3073x-spi", },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(spi, zl3073x_spi_id);
> +
> +static const struct of_device_id zl3073x_spi_of_match[] = {
> +	{ .compatible = "microchip,zl3073x-spi" },


You need bindings. If they are somewhere in this patchset then you need
correct order so before users (see DT submitting patches).

> +static void zl3073x_spi_remove(struct spi_device *spidev)
> +{
> +	struct zl3073x_dev *zldev;
> +
> +	zldev = spi_get_drvdata(spidev);
> +	zl3073x_dev_exit(zldev);
> +}
> +
> +static struct spi_driver zl3073x_spi_driver = {
> +	.driver = {
> +		.name = "zl3073x-spi",
> +		.of_match_table = of_match_ptr(zl3073x_spi_of_match),

Drop of_match_ptr, you have warnings here.


> +	},
> +	.probe = zl3073x_spi_probe,
> +	.remove = zl3073x_spi_remove,
> +	.id_table = zl3073x_spi_id,
> +};
> +



Best regards,
Krzysztof