linux-kernel - [PATCH v3 1/4] fpga: region: don't use drvdata in common fpga code

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Message-Id: <20180207210530.3099-2-atull@kernel.org>
Date:   Wed,  7 Feb 2018 15:05:27 -0600
From:   Alan Tull <atull@...nel.org>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     Anatolij Gustschin <agust@...x.de>,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        Joel Holdsworth <joel@...webreathe.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Joshua Clayton <stillcompiling@...il.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Alan Tull <atull@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Subject: [PATCH v3 1/4] fpga: region: don't use drvdata in common fpga code

Part of patchset that changes the following fpga_*_register
functions to not set drvdata:
* fpga_region_register.
* fpga_mgr_register
* fpga_bridge_register

The rationale is that setting drvdata is fine for DT based devices
that will have one manager, bridge, or region per platform device.
However PCIe based devices may have multiple FPGA mgr/bridge/regions
under one PCIe device.  Without these changes, the PCIe solution has
to create an extra device for each child mgr/bridge/region to hold
drvdata.

Signed-off-by: Alan Tull <atull@...nel.org>
Reported-by: Jiuyue Ma <majiuyue@...wei.com>
Acked-by: Moritz Fischer <mdf@...nel.org>
---
v2: No change to this patch in v2 of patchset
v3: Add Moritz' ack
---
 drivers/fpga/fpga-region.c    | 1 -
 drivers/fpga/of-fpga-region.c | 1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index edab2a2..ebe1f87 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -178,7 +178,6 @@ int fpga_region_register(struct device *dev, struct fpga_region *region)
 	region->dev.parent = dev;
 	region->dev.of_node = dev->of_node;
 	region->dev.id = id;
-	dev_set_drvdata(dev, region);
 
 	ret = dev_set_name(&region->dev, "region%d", id);
 	if (ret)
diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index 119ff75..35e7e8c 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -438,6 +438,7 @@ static int of_fpga_region_probe(struct platform_device *pdev)
 		goto eprobe_mgr_put;
 
 	of_platform_populate(np, fpga_region_of_match, NULL, &region->dev);
+	dev_set_drvdata(dev, region);
 
 	dev_info(dev, "FPGA Region probed\n");
 
-- 
2.7.4