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

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Message-ID: <333a12a8-157b-47f1-9602-e68e7d52b4c2@redhat.com>
Date: Wed, 9 Apr 2025 08:31:00 +0200
From: Ivan Vecera <ivecera@...hat.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, 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. 25 7:53 odp., Krzysztof Kozlowski wrote:
> 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

Will fix in v2.

>> 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?

It is filled in the later commits but yeah I will include the function 
once it will be necessary.

>> 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).

Yes, there are. I will reorder the patches in v2 and also split the 
whole series into several ones.

>> +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.

Ack, will avoid.

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