linux-kernel - Re: [RFC PATCH 46/57] driver: Add variants of driver_find

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Message-ID: <20190603191133.GE6487@kroah.com>
Date:   Mon, 3 Jun 2019 21:11:33 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-kernel@...r.kernel.org, rafael@...nel.org
Subject: Re: [RFC PATCH 46/57] driver: Add variants of driver_find_device()

On Mon, Jun 03, 2019 at 04:50:12PM +0100, Suzuki K Poulose wrote:
> Add a wrappers to lookup a device by name for a given driver, by various
> generic properties of a device. This can avoid the proliferation of custom
> match functions throughout the drivers.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  include/linux/device.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
> 
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 52d59d5..68d6e04 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -401,6 +401,50 @@ struct device *driver_find_device(struct device_driver *drv,
>  				  struct device *start, void *data,
>  				  int (*match)(struct device *dev, const void *data));
>  
> +/**
> + * driver_find_device_by_name - device iterator for locating a particular device
> + * of a specific name.
> + * @driver: the driver we're iterating
> + * @start: Device to begin with
> + * @name: name of the device to match
> + */
> +static inline struct device *driver_find_device_by_name(struct device_driver *drv,
> +							struct device *start,
> +							const char *name)
> +{
> +	return driver_find_device(drv, start, (void *)name, device_match_name);

Why is the cast needed?

> +}
> +
> +/**
> + * driver_find_device_by_of_node- device iterator for locating a particular device
> + * by of_node pointer.
> + * @driver: the driver we're iterating
> + * @start: Device to begin with
> + * @np: of_node pointer to match.
> + */
> +static inline struct device *
> +driver_find_device_by_of_node(struct device_driver *drv,
> +			      struct device *start,
> +			      const struct device_node *np)
> +{
> +	return driver_find_device(drv, start, (void *)np, device_match_of_node);

Same here.

> +}
> +
> +/**
> + * driver_find_device_by_fwnode- device iterator for locating a particular device
> + * by fwnode pointer.
> + * @driver: the driver we're iterating
> + * @start: Device to begin with
> + * @fwnode: fwnode pointer to match.
> + */
> +static inline struct device *
> +driver_find_device_by_fwnode(struct device_driver *drv,
> +			     struct device *start,
> +			     const struct fwnode_handle *fwnode)
> +{
> +	return driver_find_device(drv, start, (void *)fwnode, device_match_fwnode);

And here

thanks,

greg k-h