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

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Date:   Fri, 25 Mar 2022 16:35:52 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Clément Léger <clement.leger@...tlin.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()

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

...

> +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
> +	 * i2c_acpi_find_adapter_by_handle())
> +	 */

Would it be harmful to drop this check?

> +	if (!is_acpi_device_node(dev_fwnode(dev)) && dev->parent)
> +		return device_match_fwnode(dev->parent, data);
> +
> +	return 0;
> +}

-- 
With Best Regards,
Andy Shevchenko