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

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Date:   Tue, 9 Oct 2018 12:20:29 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     svellattu@...sta.com
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        linux-rdma@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Wolfram Sang <wsa@...-dreams.de>, oulijun@...wei.com,
        xavier.huwei@...wei.com, yisen.zhuang@...wei.com,
        salil.mehta@...wei.com, 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 Miller <davem@...emloft.net>
Subject: Re: [PATCH v3 1/2] Driver core: add bus_find_device_by_fwnode

On Tue, Oct 9, 2018 at 12:18 PM Silesh C V <svellattu@...sta.com> 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>

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.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)
> +{
> +       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
>