linux-kernel - Re: [PATCH v3 1/2] Driver core: add bus_find_device_by

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Message-ID: <20181009172726.GA2182@xps15>
Date:   Tue, 9 Oct 2018 11:27:26 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Silesh C V <svellattu@...sta.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-i2c@...r.kernel.org, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-spi@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
        Lijun Ou <oulijun@...wei.com>,
        "Wei Hu(Xavier)" <xavier.huwei@...wei.com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mark Brown <broonie@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3 1/2] Driver core: add bus_find_device_by_fwnode

Hi Silesh,

On Tue, Oct 09, 2018 at 03:47:24PM +0530, Silesh C V wrote:
> Some drivers need to find the device on a bus having a specific firmware
> node. Currently, such drivers have their own implementations to do this.
> Provide a helper similar to bus_find_device_by_name so that each driver
> does not have to reinvent this.
> 
> Signed-off-by: Silesh C V <svellattu@...sta.com>
> ---
> Changes since v2: 
> 	- make use of dev_fwnode in match_fwnode.
> 
>  drivers/base/bus.c     | 20 ++++++++++++++++++++
>  include/linux/device.h |  3 +++
>  2 files changed, 23 insertions(+)
> 
> diff --git a/drivers/base/bus.c b/drivers/base/bus.c
> index 8bfd27e..a2f39db 100644
> --- a/drivers/base/bus.c
> +++ b/drivers/base/bus.c
> @@ -17,6 +17,7 @@
>  #include <linux/string.h>
>  #include <linux/mutex.h>
>  #include <linux/sysfs.h>
> +#include <linux/property.h>
>  #include "base.h"
>  #include "power/power.h"
>  
> @@ -373,6 +374,25 @@ struct device *bus_find_device_by_name(struct bus_type *bus,
>  }
>  EXPORT_SYMBOL_GPL(bus_find_device_by_name);
>  
> +static int match_fwnode(struct device *dev, void *fwnode)
> +{
> +	return dev_fwnode(dev) == fwnode;
> +}
> +
> +/**
> + * bus_find_device_by_fwnode - device iterator for locating a particular device
> + * having a specific firmware node
> + * @bus: bus type
> + * @start: Device to begin with
> + * @fwnode: firmware node of the device to match
> + */
> +struct device *bus_find_device_by_fwnode(struct bus_type *bus, struct device *start,
> +					struct fwnode_handle *fwnode)

I get the following when running checkpatch on your set:

mpoirier@...15:~/work/linaro/coresight/kernel-maint$ ./scripts/checkpatch.pl
0001-Driver-core-add-bus_find_device_by_fwnode.patch
WARNING: line over 80 characters
#45: FILE: drivers/base/bus.c:389:
+struct device *bus_find_device_by_fwnode(struct bus_type *bus, struct device
*start,

total: 0 errors, 1 warnings, 41 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

0001-Driver-core-add-bus_find_device_by_fwnode.patch has style problems, please
review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.

Regards,
Mathieu

> +{
> +	return bus_find_device(bus, start, (void *)fwnode, match_fwnode);
> +}
> +EXPORT_SYMBOL_GPL(bus_find_device_by_fwnode);
> +
>  /**
>   * subsys_find_device_by_id - find a device with a specific enumeration number
>   * @subsys: subsystem
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 8f88254..09384f6 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -171,6 +171,9 @@ struct device *bus_find_device(struct bus_type *bus, struct device *start,
>  struct device *bus_find_device_by_name(struct bus_type *bus,
>  				       struct device *start,
>  				       const char *name);
> +struct device *bus_find_device_by_fwnode(struct bus_type *bus,
> +				       struct device *start,
> +				       struct fwnode_handle *fwnode);
>  struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
>  					struct device *hint);
>  int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
> -- 
> 1.9.1
>