Date:   Wed, 15 Nov 2017 07:46:28 -0800
From:   Moritz Fischer <mdf@...nel.org>
To:     Alan Tull <atull@...nel.org>
Cc:     Moritz Fischer <mdf@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Subject: Re: [PATCH v5 18/18] fpga: add attribute groups

On Tue, Oct 17, 2017 at 04:20:31PM -0500, Alan Tull wrote:
> Make it easy to add attributes to low level FPGA drivers the right
> way.  Add attribute groups pointers to structures that are used when
> registering a manager, bridge, or group.  When the low level driver
> registers, set the device attribute group.  The attributes are
> created in device_add.
> 
> Signed-off-by: Alan Tull <atull@...nel.org>
Acked-by: Moritz Fischer <mdf@...nel.org>
> ---
> v4: Patch added to patchset in v4
> v5: no change to this patch in this version of patchset
> ---
>  drivers/fpga/fpga-bridge.c       | 1 +
>  drivers/fpga/fpga-mgr.c          | 1 +
>  drivers/fpga/fpga-region.c       | 1 +
>  include/linux/fpga/fpga-bridge.h | 2 ++
>  include/linux/fpga/fpga-mgr.h    | 2 ++
>  include/linux/fpga/fpga-region.h | 2 ++
>  6 files changed, 9 insertions(+)
> 
> diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
> index 4cfb632..15ce9f1 100644
> --- a/drivers/fpga/fpga-bridge.c
> +++ b/drivers/fpga/fpga-bridge.c
> @@ -367,6 +367,7 @@ int fpga_bridge_register(struct device *dev, const char *name,
>  	bridge->priv = priv;
>  
>  	device_initialize(&bridge->dev);
> +	bridge->dev.groups = br_ops->groups;
>  	bridge->dev.class = fpga_bridge_class;
>  	bridge->dev.parent = dev;
>  	bridge->dev.of_node = dev->of_node;
> diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
> index d27e8d2..223f240 100644
> --- a/drivers/fpga/fpga-mgr.c
> +++ b/drivers/fpga/fpga-mgr.c
> @@ -569,6 +569,7 @@ int fpga_mgr_register(struct device *dev, const char *name,
>  
>  	device_initialize(&mgr->dev);
>  	mgr->dev.class = fpga_mgr_class;
> +	mgr->dev.groups = mops->groups;
>  	mgr->dev.parent = dev;
>  	mgr->dev.of_node = dev->of_node;
>  	mgr->dev.id = id;
> diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
> index afc6188..edab2a2 100644
> --- a/drivers/fpga/fpga-region.c
> +++ b/drivers/fpga/fpga-region.c
> @@ -173,6 +173,7 @@ int fpga_region_register(struct device *dev, struct fpga_region *region)
>  	mutex_init(&region->mutex);
>  	INIT_LIST_HEAD(&region->bridge_list);
>  	device_initialize(&region->dev);
> +	region->dev.groups = region->groups;
>  	region->dev.class = fpga_region_class;
>  	region->dev.parent = dev;
>  	region->dev.of_node = dev->of_node;
> diff --git a/include/linux/fpga/fpga-bridge.h b/include/linux/fpga/fpga-bridge.h
> index d5aa87e..65d3311 100644
> --- a/include/linux/fpga/fpga-bridge.h
> +++ b/include/linux/fpga/fpga-bridge.h
> @@ -11,11 +11,13 @@ struct fpga_bridge;
>   * @enable_show: returns the FPGA bridge's status
>   * @enable_set: set a FPGA bridge as enabled or disabled
>   * @fpga_bridge_remove: set FPGA into a specific state during driver remove
> + * @groups: optional attribute groups.
>   */
>  struct fpga_bridge_ops {
>  	int (*enable_show)(struct fpga_bridge *bridge);
>  	int (*enable_set)(struct fpga_bridge *bridge, bool enable);
>  	void (*fpga_bridge_remove)(struct fpga_bridge *bridge);
> +	const struct attribute_group **groups;
>  };
>  
>  /**
> diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
> index 4fb706b..3c6de23 100644
> --- a/include/linux/fpga/fpga-mgr.h
> +++ b/include/linux/fpga/fpga-mgr.h
> @@ -115,6 +115,7 @@ struct fpga_image_info {
>   * @write_sg: write the scatter list of configuration data to the FPGA
>   * @write_complete: set FPGA to operating state after writing is done
>   * @fpga_remove: optional: Set FPGA into a specific state during driver remove
> + * @groups: optional attribute groups.
>   *
>   * fpga_manager_ops are the low level functions implemented by a specific
>   * fpga manager driver.  The optional ones are tested for NULL before being
> @@ -131,6 +132,7 @@ struct fpga_manager_ops {
>  	int (*write_complete)(struct fpga_manager *mgr,
>  			      struct fpga_image_info *info);
>  	void (*fpga_remove)(struct fpga_manager *mgr);
> +	const struct attribute_group **groups;
>  };
>  
>  /**
> diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h
> index 7048449..b652031 100644
> --- a/include/linux/fpga/fpga-region.h
> +++ b/include/linux/fpga/fpga-region.h
> @@ -14,6 +14,7 @@
>   * @info: FPGA image info
>   * @priv: private data
>   * @get_bridges: optional function to get bridges to a list
> + * @groups: optional attribute groups.
>   */
>  struct fpga_region {
>  	struct device dev;
> @@ -23,6 +24,7 @@ struct fpga_region {
>  	struct fpga_image_info *info;
>  	void *priv;
>  	int (*get_bridges)(struct fpga_region *region);
> +	const struct attribute_group **groups;
>  };
>  
>  #define to_fpga_region(d) container_of(d, struct fpga_region, dev)
> -- 
> 2.7.4
> 

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