linux-kernel - Re: [PATCH v5 1/1] hwmon: Add driver for Astera Labs PT5161L retimer

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Date: Mon, 5 Feb 2024 08:15:54 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Cosmo Chou <chou.cosmo@...il.com>, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	jdelvare@...e.com, corbet@....net, broonie@...nel.org,
	naresh.solanki@...ements.com, vincent@...emblay.dev,
	patrick.rudolph@...ements.com, luca.ceresoli@...tlin.com,
	bhelgaas@...gle.com, festevam@...x.de,
	alexander.stein@...tq-group.com, heiko@...ech.de,
	jernej.skrabec@...il.com, macromorgan@...mail.com,
	forbidden405@...mail.com, sre@...nel.org, linus.walleij@...aro.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
	cosmo.chou@...ntatw.com
Subject: Re: [PATCH v5 1/1] hwmon: Add driver for Astera Labs PT5161L retimer

On Mon, Feb 05, 2024 at 04:26:08PM +0100, Krzysztof Kozlowski wrote:
> On 05/02/2024 16:20, Cosmo Chou wrote:
> > This driver implements support for temperature monitoring of Astera Labs
> > PT5161L series PCIe retimer chips.
> > 
> > This driver implementation originates from the CSDK available at
> > Link: https://github.com/facebook/openbmc/tree/helium/common/recipes-lib/retimer-v2.14
> > The communication protocol utilized is based on the I2C/SMBus standard.
> > 
> > Signed-off-by: Cosmo Chou <chou.cosmo@...il.com>
> > ---
[ ... ]

> > +
> > +static int __init pt5161l_init(void)
> > +{
> > +	pt5161l_debugfs_dir = debugfs_create_dir("pt5161l", NULL);
> 
> Drivers don't need initcalls. For sure any debugfs should not be handled
> here but in probe.
> 

Lots of hwmon drivers have init functions, for basic chip detection of
Super-I/O chips (example: drivers/hwmon/nct6775-platform.c) and to create
a parent debugfs subdirectory for the driver. The probe function then adds
subdirecties per chip instantiation. Example for pmbus, in
drivers/hwmon/pmbus/pmbus_core.c:

static int __init pmbus_core_init(void)
{
        pmbus_debugfs_dir = debugfs_create_dir("pmbus", NULL);
        if (IS_ERR(pmbus_debugfs_dir))
                pmbus_debugfs_dir = NULL;

        return 0;
}

static void __exit pmbus_core_exit(void)
{
        debugfs_remove_recursive(pmbus_debugfs_dir);
}

Are you saying this is all wrong ? What alternative would you suggest ?

Thanks,
Guenter