linux-kernel - Re: [PATCH v2 14/28] drivers: Introduce class_find_device_by

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Date:   Tue, 18 Jun 2019 13:42:59 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        rafael@...nel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 14/28] drivers: Introduce
 class_find_device_by_fwnode() helper

On Fri, Jun 14, 2019 at 06:54:09PM +0100, Suzuki K Poulose wrote:
> Add a wrapper to class_find_device() to search for a device
> by the fwnode pointer, reusing the generic match function.
> Also convert the existing users to make use of the new helper.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Cc: linux-usb@...r.kernel.org
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>

Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/roles/class.c |  8 +-------
>  drivers/usb/typec/class.c |  8 +-------
>  include/linux/device.h    | 13 +++++++++++++
>  3 files changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index 07aaa96..5cd87d8 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -85,11 +85,6 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
>  }
>  EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
>  
> -static int switch_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static void *usb_role_switch_match(struct device_connection *con, int ep,
>  				   void *data)
>  {
> @@ -99,8 +94,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
>  		if (!fwnode_property_present(con->fwnode, con->id))
>  			return NULL;
>  
> -		dev = class_find_device(role_class, NULL, con->fwnode,
> -					switch_fwnode_match);
> +		dev = class_find_device_by_fwnode(role_class, con->fwnode);
>  	} else {
>  		dev = class_find_device_by_name(role_class, con->endpoint[ep]);
>  	}
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 18a0687..af4fb73 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -205,11 +205,6 @@ static void typec_altmode_put_partner(struct altmode *altmode)
>  	put_device(&adev->dev);
>  }
>  
> -static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  {
>  	struct device *dev;
> @@ -219,8 +214,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  	 * we need to return ERR_PTR(-PROBE_DEFER) when there is no device.
>  	 */
>  	if (con->fwnode)
> -		return class_find_device(typec_class, NULL, con->fwnode,
> -					 typec_port_fwnode_match);
> +		return class_find_device_by_fwnode(typec_class, con->fwnode);
>  
>  	dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
>  
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 9228502..52ac911 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -509,6 +509,19 @@ class_find_device_by_of_node(struct class *class, const struct device_node *np)
>  	return class_find_device(class, NULL, np, device_match_of_node);
>  }
>  
> +/**
> + * class_find_device_by_fwnode : device iterator for locating a particular device
> + * matching the fwnode.
> + * @class: class type
> + * @fwnode: fwnode of the device to match.
> + */
> +static inline struct device *
> +class_find_device_by_fwnode(struct class *class,
> +			    const struct fwnode_handle *fwnode)
> +{
> +	return class_find_device(class, NULL, fwnode, device_match_fwnode);
> +}
> +
>  struct class_attribute {
>  	struct attribute attr;
>  	ssize_t (*show)(struct class *class, struct class_attribute *attr,
> -- 
> 2.7.4

thanks,

-- 
heikki