linux-kernel - Re: [PATCH v2 15/16] fpga: region: add fpga_region_class

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Date:   Wed, 3 May 2017 08:44:18 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     Alan Tull <atull@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fpga@...r.kernel.org
Subject: Re: [PATCH v2 15/16] fpga: region: add fpga_region_class_find

On Thu, Apr 20, 2017 at 7:10 AM, Alan Tull <atull@...nel.org> wrote:
> Add a function for searching the fpga-region class.  This
> will be useful when device tree code is no longer in the
> same file that declares the fpga-region class.  Another
> step in separating common FPGA region code from device
> tree support.
>
> Signed-off-by: Alan Tull <atull@...nel.org>
Acked-by: Moritz Fischer <mdf@...nel.org>
> ---
> v2: split out from another patch
> ---
>  drivers/fpga/fpga-region.c       | 23 +++++++++++++++--------
>  include/linux/fpga/fpga-region.h |  4 ++++
>  2 files changed, 19 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
> index e2a3fe6..7ffb8c1 100644
> --- a/drivers/fpga/fpga-region.c
> +++ b/drivers/fpga/fpga-region.c
> @@ -30,6 +30,20 @@
>  static DEFINE_IDA(fpga_region_ida);
>  static struct class *fpga_region_class;
>
> +struct fpga_region *fpga_region_class_find(
> +       struct device *start, const void *data,
> +       int (*match)(struct device *, const void *))
> +{
> +       struct device *dev;
> +
> +       dev = class_find_device(fpga_region_class, start, data, match);
> +       if (!dev)
> +               return NULL;
> +
> +       return to_fpga_region(dev);
> +}
> +EXPORT_SYMBOL_GPL(fpga_region_class_find);
> +
>  static const struct of_device_id fpga_region_of_match[] = {
>         { .compatible = "fpga-region", },
>         {},
> @@ -51,14 +65,7 @@ static int fpga_region_of_node_match(struct device *dev, const void *data)
>   */
>  static struct fpga_region *of_fpga_region_find(struct device_node *np)
>  {
> -       struct device *dev;
> -
> -       dev = class_find_device(fpga_region_class, NULL, np,
> -                               fpga_region_of_node_match);
> -       if (!dev)
> -               return NULL;
> -
> -       return to_fpga_region(dev);
> +       return fpga_region_class_find(NULL, np, fpga_region_of_node_match);
>  }
>
>  /**
> diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h
> index 35e7e09..4966bb2 100644
> --- a/include/linux/fpga/fpga-region.h
> +++ b/include/linux/fpga/fpga-region.h
> @@ -28,6 +28,10 @@ struct fpga_region {
>
>  #define to_fpga_region(d) container_of(d, struct fpga_region, dev)
>
> +struct fpga_region *fpga_region_class_find(
> +       struct device *start, const void *data,
> +       int (*match)(struct device *, const void *));
> +
>  int fpga_region_program_fpga(struct fpga_region *region,
>                              struct fpga_image_info *image_info);
>
> --
> 2.7.4
>