[PATCH v4 12/19] fpga: dfl: store MMIO resources in feature device data

[Peter Colberg <peter.colberg@xxxxxxxxx>]

Instead of directly copying the MMIO resource of each feature to the
feature device resources, add a new member to the feature device data
to store the resources and copy them to the feature device using
platform_device_add_resources(). This prepares a subsequent commit
which completely destroys and recreates the feature device when
releasing and reassigning the corresponding port, respectively.

Signed-off-by: Peter Colberg <peter.colberg@xxxxxxxxx>
Reviewed-by: Matthew Gerlach <matthew.gerlach@xxxxxxxxxxxxxxx>
Reviewed-by: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@xxxxxxxxxxxxxxx>
---
Changes since v3:
- New patch extracted from last patch of v3 series.
---
 drivers/fpga/dfl.c | 21 +++++++++++++--------
 drivers/fpga/dfl.h |  4 ++++
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 094bba647085..46c1b2534430 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -761,6 +761,11 @@ binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
 	if (!fdata->features)
 		return ERR_PTR(-ENOMEM);
 
+	fdata->resources = devm_kcalloc(binfo->dev, binfo->feature_num,
+					sizeof(*fdata->resources), GFP_KERNEL);
+	if (!fdata->resources)
+		return ERR_PTR(-ENOMEM);
+
 	fdata->dev = fdev;
 	fdata->type = type;
 	fdata->num = binfo->feature_num;
@@ -778,13 +783,6 @@ binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
 	 */
 	WARN_ON(fdata->disable_count);
 
-	/* each sub feature has one MMIO resource */
-	fdev->num_resources = binfo->feature_num;
-	fdev->resource = kcalloc(binfo->feature_num, sizeof(*fdev->resource),
-				 GFP_KERNEL);
-	if (!fdev->resource)
-		return ERR_PTR(-ENOMEM);
-
 	/* fill features and resource information for feature dev */
 	list_for_each_entry_safe(finfo, p, &binfo->sub_features, node) {
 		struct dfl_feature *feature = &fdata->features[index++];
@@ -822,7 +820,7 @@ binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
 				return feature->ioaddr;
 		} else {
 			feature->resource_index = res_idx;
-			fdev->resource[res_idx++] = finfo->mmio_res;
+			fdata->resources[res_idx++] = finfo->mmio_res;
 		}
 
 		if (finfo->nr_irqs) {
@@ -843,6 +841,8 @@ binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
 		kfree(finfo);
 	}
 
+	fdata->resource_num = res_idx;
+
 	return fdata;
 }
 
@@ -886,6 +886,11 @@ static int feature_dev_register(struct dfl_feature_dev_data *fdata)
 	fdev->dev.parent = &fdata->dfl_cdev->region->dev;
 	fdev->dev.devt = dfl_get_devt(dfl_devs[fdata->type].devt_type, fdev->id);
 
+	ret = platform_device_add_resources(fdev, fdata->resources,
+					    fdata->resource_num);
+	if (ret)
+		return ret;
+
 	pdata.fdata = fdata;
 	ret = platform_device_add_data(fdev, &pdata, sizeof(pdata));
 	if (ret)
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index d2765555e109..921d946e4820 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -317,6 +317,8 @@ struct dfl_feature {
  * @num: number for sub features.
  * @private: ptr to feature dev private data.
  * @features: sub features for the feature dev.
+ * @resource_num: number of resources for the feature dev.
+ * @resources: resources for the feature dev.
  */
 struct dfl_feature_dev_data {
 	struct list_head node;
@@ -331,6 +333,8 @@ struct dfl_feature_dev_data {
 	void *private;
 	int num;
 	struct dfl_feature *features;
+	int resource_num;
+	struct resource *resources;
 };
 
 /**
-- 
2.47.0