linux-kernel - Re: [PATCH v3.1 1/2] device property: Add device_get_bd_address() and fwnode_get_bd

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Date:   Wed, 26 Sep 2018 14:36:25 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Andy Shevchenko Andy Shevchenko <andy.shevchenko@...il.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pekka Enberg <penberg@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Brian Norris <briannorris@...omium.org>
Subject: Re: [PATCH v3.1 1/2] device property: Add device_get_bd_address()
 and fwnode_get_bd_address()

On Tue, Sep 25, 2018 at 12:10:13PM -0700, Matthias Kaehlcke wrote:
> +/**
> + * fwnode_get_bd_address - Get the Bluetooth Device Address (BD_ADDR) from the
> + *                         firmware node
> + * @fwnode:	Pointer to the firmware node
> + * @bd_addr:	Pointer to struct to store the BD address in
> + *
> + * Search the firmware node for 'local-bd-address'.
> + *
> + * All-zero BD addresses are rejected, because those could be properties
> + * that exist in the firmware tables, but were not updated by the firmware. For
> + * example, the DTS could define 'local-bd-address', with zero BD addresses.
> + */
> +int fwnode_get_bd_address(struct fwnode_handle *fwnode, bdaddr_t *bd_addr)
> +{
> +	bdaddr_t ba;
> +	int ret;
> +
> +	ret = fwnode_property_read_u8_array(fwnode, "local-bd-address",
> +					    (u8 *)&ba, sizeof(bdaddr_t));
> +	if (ret < 0)
> +		return ret;
> +	if (is_zero_ether_addr((u8 *)&ba))
> +		return -ENODATA;
> +
> +	memcpy(bd_addr, &ba, sizeof(bdaddr_t));
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(fwnode_get_bd_address);
> +
> +/**
> + * device_get_bd_address - Get the Bluetooth Device Address (BD_ADDR) for a
> + *                         given device
> + * @dev:	Pointer to the device
> + * @bd_addr:	Pointer to struct to store the BD address in
> + */
> +int device_get_bd_address(struct device *dev, bdaddr_t *bd_addr)
> +{
> +	return fwnode_get_bd_address(dev_fwnode(dev), bd_addr);
> +}
> +EXPORT_SYMBOL_GPL(device_get_bd_address);

Let's not fill property.c with framework specific helper functions any
more!

Those functions are completely bluetooth specific, so they do not
belong here. The fact that some other framework already managed to
slip their helpers in does not justify others to do the same.


Thanks,

-- 
heikki