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Expose libfdt for use by Alveo/XRT

PATCH New Sonal Santan 1 participant 2 messages Nov 28, 2020

Subsystems (2)
Library code FPGA manager framework
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Share & tools
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Sonal Santan

author
#0 lore raw

cover Expose libfdt for use by Alveo/XRT

Hello,

This patch series adds support for exporting limited set of libfdt symbols from Linux kernel. It enables drivers and other kernel modules to use libfdt for working with device trees. This may be used by platform vendors to describe HW features inside a PCIe device to its driver in a data driven manner.

"Xilinx Alveo" PCIe accelerator card driver patch series which follows this patch makes use of device tree to advertise HW subsystems sitting behind PCIe BARs. The use of device trees makes the driver data driven and overall solution more scalable.

Thanks,
-Sonal

Sonal Santan (1):
Export subset of libfdt symbols for use by other drivers.

 lib/fdt.c            |  6 ++++++
 lib/fdt_empty_tree.c |  3 +++
 lib/fdt_ro.c         | 11 +++++++++++
 lib/fdt_rw.c         |  6 ++++++
 4 files changed, 26 insertions(+)
Signature · 1 line
2.17.1
author
#1 lore raw

PATCH 1/1 Export subset of libfdt symbols for use by other drivers.

From: Sonal Santan <[email protected]>

Some drivers may want to use device tree as metadata format to discover HW subsystems behind PCIe BAR. This is particularly useful for PCIe FPGA devices.

Signed-off-by Sonal Santan <[email protected]>
---
 lib/fdt.c            |  6 ++++++
 lib/fdt_empty_tree.c |  3 +++
 lib/fdt_ro.c         | 11 +++++++++++
 lib/fdt_rw.c         |  6 ++++++
 4 files changed, 26 insertions(+)
lib/fdt.c +6 -0
index 97f20069fc37..9747513b50e7 100644
@@ -1,2 +1,8 @@
 #include <linux/libfdt_env.h>
+#include <linux/export.h>
 #include "../scripts/dtc/libfdt/fdt.c"
+
+EXPORT_SYMBOL_GPL(fdt_next_node);
+EXPORT_SYMBOL_GPL(fdt_first_subnode);
+EXPORT_SYMBOL_GPL(fdt_next_subnode);
+EXPORT_SYMBOL_GPL(fdt_subnode_offset);
lib/fdt_empty_tree.c +3 -0
index 5d30c58150ad..3dab578c9d22 100644
@@ -1,2 +1,5 @@
 #include <linux/libfdt_env.h>
+#include <linux/export.h>
 #include "../scripts/dtc/libfdt/fdt_empty_tree.c"
+
+EXPORT_SYMBOL_GPL(fdt_create_empty_tree);
lib/fdt_ro.c +11 -0
index f73c04ea7be4..ec96cf3d0d7a 100644
@@ -1,2 +1,13 @@
 #include <linux/libfdt_env.h>
+#include <linux/export.h>
 #include "../scripts/dtc/libfdt/fdt_ro.c"
+
+EXPORT_SYMBOL_GPL(fdt_getprop_by_offset);
+EXPORT_SYMBOL_GPL(fdt_node_check_compatible);
+EXPORT_SYMBOL_GPL(fdt_get_name);
+EXPORT_SYMBOL_GPL(fdt_next_property_offset);
+EXPORT_SYMBOL_GPL(fdt_getprop);
+EXPORT_SYMBOL_GPL(fdt_node_offset_by_compatible);
+EXPORT_SYMBOL_GPL(fdt_parent_offset);
+EXPORT_SYMBOL_GPL(fdt_stringlist_get);
+EXPORT_SYMBOL_GPL(fdt_first_property_offset);
lib/fdt_rw.c +6 -0
index 0c1f0f4a4b13..ec3939ed3d7d 100644
@@ -1,2 +1,8 @@
 #include <linux/libfdt_env.h>
+#include <linux/export.h>
 #include "../scripts/dtc/libfdt/fdt_rw.c"
+
+EXPORT_SYMBOL_GPL(fdt_del_node);
+EXPORT_SYMBOL_GPL(fdt_add_subnode);
+EXPORT_SYMBOL_GPL(fdt_pack);
+EXPORT_SYMBOL_GPL(fdt_setprop);
Signature · 1 line
2.17.1