linux-kernel - [PATCH v4 09/18] fpga: region: use image info as parameter for programming region

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Message-Id: <20170913204841.2730-10-atull@kernel.org>
Date:   Wed, 13 Sep 2017 15:48:32 -0500
From:   Alan Tull <atull@...nel.org>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     Alan Tull <atull@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Subject: [PATCH v4 09/18] fpga: region: use image info as parameter for programming region

Use FPGA image info (region->info) when region code is
programming the FPGA to pass in multiple parameters.

This is a baby step in refactoring the FPGA region code to
separate out common FPGA region code from FPGA region
Device Tree overlay support.

Signed-off-by: Alan Tull <atull@...nel.org>
---
v2: split out from another patch
v3: change API to use the region->info, remove info param
    remove check for region->info, not needed
v4: no change to this patch in this version of patchset
---
 drivers/fpga/fpga-region.c    | 16 +++++++++-------
 include/linux/fpga/fpga-mgr.h |  4 ++++
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index 35af952..eaacf50 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -223,14 +223,13 @@ static int fpga_region_get_bridges(struct fpga_region *region,
 /**
  * fpga_region_program_fpga - program FPGA
  * @region: FPGA region
- * @overlay: device node of the overlay
- * Program an FPGA using information in the region's fpga image info.
+ * Program an FPGA using fpga image info (region->info).
  * Return 0 for success or negative error code.
  */
-static int fpga_region_program_fpga(struct fpga_region *region,
-				    struct device_node *overlay)
+static int fpga_region_program_fpga(struct fpga_region *region)
 {
 	struct device *dev = &region->dev;
+	struct fpga_image_info *info = region->info;
 	int ret;
 
 	region = fpga_region_get(region);
@@ -245,7 +244,7 @@ static int fpga_region_program_fpga(struct fpga_region *region,
 		goto err_put_region;
 	}
 
-	ret = fpga_region_get_bridges(region, overlay);
+	ret = fpga_region_get_bridges(region, info->overlay);
 	if (ret) {
 		dev_err(dev, "failed to get FPGA bridges\n");
 		goto err_unlock_mgr;
@@ -257,7 +256,7 @@ static int fpga_region_program_fpga(struct fpga_region *region,
 		goto err_put_br;
 	}
 
-	ret = fpga_mgr_load(region->mgr, region->info);
+	ret = fpga_mgr_load(region->mgr, info);
 	if (ret) {
 		dev_err(dev, "failed to load FPGA image\n");
 		goto err_put_br;
@@ -373,6 +372,8 @@ static int fpga_region_notify_pre_apply(struct fpga_region *region,
 	if (!info)
 		return -ENOMEM;
 
+	info->overlay = nd->overlay;
+
 	/* Read FPGA region properties from the overlay */
 	if (of_property_read_bool(nd->overlay, "partial-fpga-config"))
 		info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
@@ -421,7 +422,8 @@ static int fpga_region_notify_pre_apply(struct fpga_region *region,
 	}
 
 	region->info = info;
-	ret = fpga_region_program_fpga(region, nd->overlay);
+
+	ret = fpga_region_program_fpga(region);
 	if (ret) {
 		fpga_image_info_free(info);
 		region->info = NULL;
diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
index 5e2b36e..6977a6b02 100644
--- a/include/linux/fpga/fpga-mgr.h
+++ b/include/linux/fpga/fpga-mgr.h
@@ -89,6 +89,7 @@ enum fpga_mgr_states {
  * @buf: contiguous buffer containing FPGA image
  * @count: size of buf
  * @dev: device that owns this
+ * @overlay: Device Tree overlay
  */
 struct fpga_image_info {
 	u32 flags;
@@ -100,6 +101,9 @@ struct fpga_image_info {
 	const char *buf;
 	size_t count;
 	struct device *dev;
+#ifdef CONFIG_OF
+	struct device_node *overlay;
+#endif
 };
 
 /**
-- 
2.7.4