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Date:   Tue, 29 Dec 2020 10:16:45 +0800
From:   Xu Yilun <>
        Matthew Gerlach <>,
        Russ Weight <>
Subject: [PATCH v14 3/6] fpga: dfl: add dfl bus support to MODULE_DEVICE_TABLE()

Device Feature List (DFL) is a linked list of feature headers within the
device MMIO space. It is used by FPGA to enumerate multiple sub features
within it. Each feature can be uniquely identified by DFL type and
feature id, which can be read out from feature headers.

A dfl bus helps DFL framework modularize DFL device drivers for
different sub features. The dfl bus matches its devices and drivers by
DFL type and feature id.

This patch adds dfl bus support to MODULE_DEVICE_TABLE() by adding info
about struct dfl_device_id in devicetable-offsets.c and add a dfl entry
point in file2alias.c.

Signed-off-by: Xu Yilun <>
Signed-off-by: Wu Hao <>
Signed-off-by: Matthew Gerlach <>
Signed-off-by: Russ Weight <>
Acked-by: Wu Hao <>
Signed-off-by: Moritz Fischer <>
v2: add comments for the format of modalias
v3: changes the names from dfl_XXX to fpga_dfl_XXX
    delete the comments of valid bits for modalias format
v9: rebase the patch for bus name changes back to "dfl"
v10: no change
v11: no change
v12: no change
v13: no change
v14: no change, rebase to 5.11-rc1
 scripts/mod/devicetable-offsets.c |  4 ++++
 scripts/mod/file2alias.c          | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index e377f52..1b14f3c 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -246,5 +246,9 @@ int main(void)
 	DEVID_FIELD(auxiliary_device_id, name);
+	DEVID(dfl_device_id);
+	DEVID_FIELD(dfl_device_id, type);
+	DEVID_FIELD(dfl_device_id, feature_id);
 	return 0;
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index fb48270..7ebabeb 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -1375,6 +1375,18 @@ static int do_auxiliary_entry(const char *filename, void *symval, char *alias)
 	return 1;
+/* Looks like: dfl:tNfN */
+static int do_dfl_entry(const char *filename, void *symval, char *alias)
+	DEF_FIELD(symval, dfl_device_id, type);
+	DEF_FIELD(symval, dfl_device_id, feature_id);
+	sprintf(alias, "dfl:t%04Xf%04X", type, feature_id);
+	add_wildcard(alias);
+	return 1;
 /* Does namelen bytes of name exactly match the symbol? */
 static bool sym_is(const char *name, unsigned namelen, const char *symbol)
@@ -1450,6 +1462,7 @@ static const struct devtable devtable[] = {
 	{"wmi", SIZE_wmi_device_id, do_wmi_entry},
 	{"mhi", SIZE_mhi_device_id, do_mhi_entry},
 	{"auxiliary", SIZE_auxiliary_device_id, do_auxiliary_entry},
+	{"dfl", SIZE_dfl_device_id, do_dfl_entry},
 /* Create MODULE_ALIAS() statements.

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