linux-hardening - Re: [PATCH v3 net-next 8/8] mfd: zl3073x: Register DPLL sub-device during init

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Message-ID: <335003db-49e5-4501-94e5-4e9c6994be7d@redhat.com>
Date: Thu, 17 Apr 2025 18:40:44 +0200
From: Ivan Vecera <ivecera@...hat.com>
To: Lee Jones <lee@...nel.org>
Cc: netdev@...r.kernel.org, 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>,
 Kees Cook <kees@...nel.org>, Andy Shevchenko <andy@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Michal Schmidt <mschmidt@...hat.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 net-next 8/8] mfd: zl3073x: Register DPLL sub-device
 during init



On 17. 04. 25 6:20 odp., Lee Jones wrote:
> On Wed, 16 Apr 2025, Ivan Vecera wrote:
> 
>> Register DPLL sub-devices to expose this functionality provided
>> by ZL3073x chip family. Each sub-device represents one of the provided
>> DPLL channels.
>>
>> Signed-off-by: Ivan Vecera <ivecera@...hat.com>
>> ---
>>   drivers/mfd/zl3073x-core.c | 15 +++++++++++++++
>>   1 file changed, 15 insertions(+)
>>
>> diff --git a/drivers/mfd/zl3073x-core.c b/drivers/mfd/zl3073x-core.c
>> index 0bd31591245a2..fda77724a8452 100644
>> --- a/drivers/mfd/zl3073x-core.c
>> +++ b/drivers/mfd/zl3073x-core.c
>> @@ -6,6 +6,7 @@
>>   #include <linux/device.h>
>>   #include <linux/export.h>
>>   #include <linux/math64.h>
>> +#include <linux/mfd/core.h>
>>   #include <linux/mfd/zl3073x.h>
>>   #include <linux/mfd/zl3073x_regs.h>
>>   #include <linux/module.h>
>> @@ -774,6 +775,20 @@ int zl3073x_dev_probe(struct zl3073x_dev *zldev,
>>   	if (rc)
>>   		return rc;
>>   
>> +	/* Add DPLL sub-device cell for each DPLL channel */
>> +	for (i = 0; i < chip_info->num_channels; i++) {
>> +		struct mfd_cell dpll_dev = MFD_CELL_BASIC("zl3073x-dpll", NULL,
>> +							  NULL, 0, i);
> 
> Create a static one of these with the maximum amount of channels.

Like this?

static const struct mfd_cell dpll_cells[] = {
	MFD_CELL_BASIC("zl3073x-dpll", NULL, NULL, 0, 1),
	MFD_CELL_BASIC("zl3073x-dpll", NULL, NULL, 0, 2),
	MFD_CELL_BASIC("zl3073x-dpll", NULL, NULL, 0, 3),
	MFD_CELL_BASIC("zl3073x-dpll", NULL, NULL, 0, 4),
	MFD_CELL_BASIC("zl3073x-dpll", NULL, NULL, 0, 5),
};

rc = devm_mfd_add_devices(zldev->dev, PLATFORM_DEVID_AUTO, dpll_cells,
                           chip_info->num_channels, NULL, 0, NULL);

Ivan
> 
>> +
>> +		rc = devm_mfd_add_devices(zldev->dev, PLATFORM_DEVID_AUTO,
>> +					  &dpll_dev, 1, NULL, 0, NULL);
> 
> Then pass chip_info->num_channels as the 4th argument.
> 
>> +		if (rc) {
>> +			dev_err_probe(zldev->dev, rc,
>> +				      "Failed to add DPLL sub-device\n");
>> +			return rc;
>> +		}
>> +	}
>> +
>>   	/* Register the device as devlink device */
>>   	devlink = priv_to_devlink(zldev);
>>   	devlink_register(devlink);
>> -- 
>> 2.48.1
>>
>