libfdt: overlay: make overlay_get_target() public
This is done to get the target path for the overlay nodes which is very useful
in many cases. For example, Xen hypervisor needs it when applying overlays
because Xen needs to do further processing of the overlay nodes, e.g. mapping of
resources(IRQs and IOMMUs) to other VMs, creation of SMMU pagetables, etc.
Signed-off-by: Vikram Garhwal <fnu.vikram@xilinx.com>
Message-Id: <1637204036-382159-2-git-send-email-fnu.vikram@xilinx.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/libfdt/fdt_overlay.c b/libfdt/fdt_overlay.c
index d217e79..5c0c398 100644
--- a/libfdt/fdt_overlay.c
+++ b/libfdt/fdt_overlay.c
@@ -40,37 +40,22 @@
return fdt32_to_cpu(*val);
}
-/**
- * overlay_get_target - retrieves the offset of a fragment's target
- * @fdt: Base device tree blob
- * @fdto: Device tree overlay blob
- * @fragment: node offset of the fragment in the overlay
- * @pathp: pointer which receives the path of the target (or NULL)
- *
- * overlay_get_target() retrieves the target offset in the base
- * device tree of a fragment, no matter how the actual targeting is
- * done (through a phandle or a path)
- *
- * returns:
- * the targeted node offset in the base device tree
- * Negative error code on error
- */
-static int overlay_get_target(const void *fdt, const void *fdto,
- int fragment, char const **pathp)
+int fdt_overlay_target_offset(const void *fdt, const void *fdto,
+ int fragment_offset, char const **pathp)
{
uint32_t phandle;
const char *path = NULL;
int path_len = 0, ret;
/* Try first to do a phandle based lookup */
- phandle = overlay_get_target_phandle(fdto, fragment);
+ phandle = overlay_get_target_phandle(fdto, fragment_offset);
if (phandle == (uint32_t)-1)
return -FDT_ERR_BADPHANDLE;
/* no phandle, try path */
if (!phandle) {
/* And then a path based lookup */
- path = fdt_getprop(fdto, fragment, "target-path", &path_len);
+ path = fdt_getprop(fdto, fragment_offset, "target-path", &path_len);
if (path)
ret = fdt_path_offset(fdt, path);
else
@@ -636,7 +621,7 @@
if (overlay < 0)
return overlay;
- target = overlay_get_target(fdt, fdto, fragment, NULL);
+ target = fdt_overlay_target_offset(fdt, fdto, fragment, NULL);
if (target < 0)
return target;
@@ -779,7 +764,7 @@
return -FDT_ERR_BADOVERLAY;
/* get the target of the fragment */
- ret = overlay_get_target(fdt, fdto, fragment, &target_path);
+ ret = fdt_overlay_target_offset(fdt, fdto, fragment, &target_path);
if (ret < 0)
return ret;
target = ret;
@@ -801,7 +786,7 @@
if (!target_path) {
/* again in case setprop_placeholder changed it */
- ret = overlay_get_target(fdt, fdto, fragment, &target_path);
+ ret = fdt_overlay_target_offset(fdt, fdto, fragment, &target_path);
if (ret < 0)
return ret;
target = ret;
diff --git a/libfdt/libfdt.h b/libfdt/libfdt.h
index 7f117e8..a7f432c 100644
--- a/libfdt/libfdt.h
+++ b/libfdt/libfdt.h
@@ -2116,6 +2116,24 @@
*/
int fdt_overlay_apply(void *fdt, void *fdto);
+/**
+ * fdt_overlay_target_offset - retrieves the offset of a fragment's target
+ * @fdt: Base device tree blob
+ * @fdto: Device tree overlay blob
+ * @fragment_offset: node offset of the fragment in the overlay
+ * @pathp: pointer which receives the path of the target (or NULL)
+ *
+ * fdt_overlay_target_offset() retrieves the target offset in the base
+ * device tree of a fragment, no matter how the actual targeting is
+ * done (through a phandle or a path)
+ *
+ * returns:
+ * the targeted node offset in the base device tree
+ * Negative error code on error
+ */
+int fdt_overlay_target_offset(const void *fdt, const void *fdto,
+ int fragment_offset, char const **pathp);
+
/**********************************************************************/
/* Debugging / informational functions */
/**********************************************************************/
diff --git a/libfdt/version.lds b/libfdt/version.lds
index 7ab85f1..cbce5d4 100644
--- a/libfdt/version.lds
+++ b/libfdt/version.lds
@@ -77,6 +77,7 @@
fdt_appendprop_addrrange;
fdt_setprop_inplace_namelen_partial;
fdt_create_with_flags;
+ fdt_overlay_target_offset;
local:
*;
};
