linux-kernel - Re: [PATCH v2 4/4] i2c: allow specify device properties in i2c_board

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Date:   Wed, 1 Feb 2017 17:24:18 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH v2 4/4] i2c: allow specify device properties in
 i2c_board_info

On Tue, Jan 31, 2017 at 06:11:30PM -0800, Dmitry Torokhov wrote:
> With many drivers converting to using generic device properties, it is
> useful to provide array of device properties when instantiating new i2c
> client via i2c_board_info and have them automatically added to the device
> in question.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/i2c/i2c-core.c | 16 +++++++++++++++-
>  include/linux/i2c.h    |  3 +++
>  2 files changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index f009549f86a5..3897e78e5e9a 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -1335,15 +1335,29 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
>  	client->dev.fwnode = info->fwnode;
>  
>  	i2c_dev_set_name(adap, client);
> +
> +	if (info->properties) {
> +		status = device_add_properties(&client->dev, info->properties);

I don't remember anymore how it was but is the driver core supposed to
free this automatically when the device is removed or should we deal
this in the i2c-core instead?

> +		if (status) {
> +			dev_err(&adap->dev,
> +				"Failed to add properties to client %s: %d\n",
> +				client->name, status);
> +			goto out_err;
> +		}
> +	}
> +
>  	status = device_register(&client->dev);
>  	if (status)
> -		goto out_err;
> +		goto out_free_props;
>  
>  	dev_dbg(&adap->dev, "client [%s] registered with bus id %s\n",
>  		client->name, dev_name(&client->dev));
>  
>  	return client;
>  
> +out_free_props:
> +	if (info->properties)
> +		device_remove_properties(&client->dev);
>  out_err:
>  	dev_err(&adap->dev,
>  		"Failed to register i2c client %s at 0x%02x (%d)\n",
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index 4aa7d244b38a..ec8f866a5656 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -51,6 +51,7 @@ enum i2c_slave_event;
>  typedef int (*i2c_slave_cb_t)(struct i2c_client *, enum i2c_slave_event, u8 *);
>  
>  struct module;
> +struct property_entry;
>  
>  #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
>  /*
> @@ -310,6 +311,7 @@ static inline int i2c_slave_event(struct i2c_client *client,
>   * @archdata: copied into i2c_client.dev.archdata
>   * @of_node: pointer to OpenFirmware device node
>   * @fwnode: device node supplied by the platform firmware
> + * @properties: additional device properties for the device
>   * @irq: stored in i2c_client.irq
>   *
>   * I2C doesn't actually support hardware probing, although controllers and
> @@ -331,6 +333,7 @@ struct i2c_board_info {
>  	struct dev_archdata	*archdata;
>  	struct device_node *of_node;
>  	struct fwnode_handle *fwnode;
> +	const struct property_entry *properties;
>  	int		irq;
>  };
>  
> -- 
> 2.11.0.483.g087da7b7c-goog