linux-kernel - [PATCH v10 2/6] fpga: dfl: move dfl_device_id to mod

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Date:   Thu, 15 Oct 2020 15:16:29 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     mdf@...nel.org, krzk@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, trix@...hat.com, lgoncalv@...hat.com,
        yilun.xu@...el.com, hao.wu@...el.com,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        Russ Weight <russell.h.weight@...el.com>
Subject: [PATCH v10 2/6] fpga: dfl: move dfl_device_id to mod_devicetable.h

In order to support MODULE_DEVICE_TABLE() for dfl device driver, this
patch moves struct dfl_device_id to mod_devicetable.h

Some brief description for DFL (Device Feature List) is added to make
the DFL known to the whole kernel.

Signed-off-by: Xu Yilun <yilun.xu@...el.com>
Signed-off-by: Wu Hao <hao.wu@...el.com>
Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Signed-off-by: Russ Weight <russell.h.weight@...el.com>
Reviewed-by: Tom Rix <trix@...hat.com>
Acked-by: Wu Hao <hao.wu@...el.com>
Signed-off-by: Moritz Fischer <mdf@...nel.org>
---
v2: fix the order for the header file
v3: rebase the patch for dfl bus name change
v9: rebase the patch for dfl bus name changes back to "dfl"
v10: add some comments to describe what is DFL.
---
 drivers/fpga/dfl.h              | 13 +------------
 include/linux/mod_devicetable.h | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index ac373b1..549c790 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -22,6 +22,7 @@
 #include <linux/interrupt.h>
 #include <linux/iopoll.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/uuid.h>
@@ -526,18 +527,6 @@ enum dfl_id_type {
 };
 
 /**
- * struct dfl_device_id -  dfl device identifier
- * @type: DFL FIU type of the device. See enum dfl_id_type.
- * @feature_id: feature identifier local to its DFL FIU type.
- * @driver_data: driver specific data.
- */
-struct dfl_device_id {
-	u16 type;
-	u16 feature_id;
-	unsigned long driver_data;
-};
-
-/**
  * struct dfl_device - represent an dfl device on dfl bus
  *
  * @dev: generic device interface.
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 5b08a47..e4870e5 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -838,4 +838,28 @@ struct mhi_device_id {
 	kernel_ulong_t driver_data;
 };
 
+/*
+ * DFL (Device Feature List)
+ *
+ * DFL defines a linked list of feature headers within the device MMIO space to
+ * provide an extensible way of adding features. Software can walk through these
+ * predefined data structures to enumerate features. It is now used in the FPGA.
+ * See Documentation/fpga/dfl.rst for more information.
+ *
+ * The dfl bus type is introduced to match the individual feature devices (dfl
+ * devices) for specific dfl drivers.
+ */
+
+/**
+ * struct dfl_device_id -  dfl device identifier
+ * @type: DFL FIU type of the device. See enum dfl_id_type.
+ * @feature_id: feature identifier local to its DFL FIU type.
+ * @driver_data: driver specific data.
+ */
+struct dfl_device_id {
+	__u16 type;
+	__u16 feature_id;
+	unsigned long driver_data;
+};
+
 #endif /* LINUX_MOD_DEVICETABLE_H */
-- 
2.7.4