linux-kernel - Re: [PATCH v3 6/9] i2c: fwnode: add fwnode_find_i2c_adapter_by

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Date:   Fri, 25 Mar 2022 16:09:27 +0100
From:   Clément Léger <clement.leger@...tlin.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Wolfram Sang <wsa@...nel.org>, Peter Rosin <peda@...ntia.se>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Len Brown <lenb@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 6/9] i2c: fwnode: add
 fwnode_find_i2c_adapter_by_node()

Le Fri, 25 Mar 2022 16:35:52 +0200,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> a écrit :

> On Fri, Mar 25, 2022 at 12:31:45PM +0100, Clément Léger wrote:
> > Add fwnode_find_i2c_adapter_by_node() which allows to retrieve a i2c
> > adapter using a fwnode. Since dev_fwnode() uses the fwnode provided by
> > the of_node member of the device, this will also work for devices were
> > the of_node has been set and not the fwnode field.
> > For acpi nodes, the check for parent node is skipped since
> > i2c_acpi_find_adapter_by_handle() does not check it and we don't want
> > to change this behavior.  
> 
> ...
> 
> > +#include <linux/device.h>
> > +#include <linux/i2c.h>  
> 
> Missed headers so far:
> acpi.h

Indeed, will check that.

> 
> ...
> 
> > +static int fwnode_dev_or_parent_node_match(struct device *dev, const void *data)
> > +{
> > +	if (device_match_fwnode(dev, data))
> > +		return 1;
> > +
> > +	/*
> > +	 * For ACPI device node, the behavior is to not match the parent (see
> > +	 *  did not checked the )
> > +	 */  
> 
> Would it be harmful to drop this check?

Can't tell, I would not want to introduce some behavior wrt to parent
node for ACPI since it was not done this way. Might works in 99% of the
case though.

If ok with that, I can drop it.


-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com