linux-kernel - Re: [PATCH v4 02/10] property: Add device_get_child_node_count

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Message-ID: <Z72QAOA9xXbP16K-@kuha.fi.intel.com>
Date: Tue, 25 Feb 2025 11:40:16 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Matti Vaittinen <mazziesaccount@...il.com>
Cc: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Daniel Scally <djrscally@...il.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Hugo Villeneuve <hvilleneuve@...onoff.com>,
	Nuno Sa <nuno.sa@...log.com>, David Lechner <dlechner@...libre.com>,
	Javier Carrasco <javier.carrasco.cruz@...il.com>,
	Guillaume Stols <gstols@...libre.com>,
	Olivier Moysan <olivier.moysan@...s.st.com>,
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	Trevor Gamblin <tgamblin@...libre.com>,
	Matteo Martelli <matteomartelli3@...il.com>,
	Alisa-Dariana Roman <alisadariana@...il.com>,
	Ramona Alexandra Nechita <ramona.nechita@...log.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v4 02/10] property: Add
 device_get_child_node_count_named()

Hi,

> +/**
> + * device_get_child_node_count_named - number of child nodes with given name
> + *
> + * Scan device's child nodes and find all the nodes with a specific name and
> + * return the number of found nodes. Potential '@...ber' -ending for scanned
> + * names is ignored. Eg,
> + * device_get_child_node_count(dev, "channel");
> + * would match all the nodes:
> + * channel { }, channel@0 {}, channel@...bba {}...
> + *
> + * @dev: Device to count the child nodes for
> + *
> + * Return: the number of child nodes with a matching name for a given device.
> + */
> +unsigned int device_get_child_node_count_named(const struct device *dev,
> +					       const char *name)
> +{
> +	struct fwnode_handle *child;
> +	unsigned int count = 0;
> +
> +	device_for_each_child_node(dev, child)
> +		if (fwnode_name_eq(child, "channel"))

s/"channel"/name/ ?

> +			count++;
> +
> +	return count;
> +}
> +EXPORT_SYMBOL_GPL(device_get_child_node_count_named);

I did not check how many users are you proposing for this, but if
there's only one, then IMO this should not be a global function yet.
It just feels to special case to me. But let's see what the others
think.

thanks,

-- 
heikki