This offers the possibility to load dt overlays on the kernel device
tree during booting. Several globalvars control which device trees
are used. global.of_overlay_dir specifies the directory where overlay
files are expected. global.of_overlay_filepattern specifies file
patterns which the overlay files must match. It is a colon separated
list for multiple file patterns. The patterns may contain '*' and '?'
wildcards. When this variable is empty then no overlays are applied.
global.of_overlay_compatible is used to apply only compatible overlays.
This is also a colon separated list which contains compatible strings.
An overlay is only applied when it's compatible to one of the strings.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/of/overlay.c | 66 ++++++++++++++++++++++++++++++++++++++++++++
include/of.h | 18 ++++++++++++
2 files changed, 84 insertions(+)
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index d42e15ed1c..b0916028fe 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -16,6 +16,7 @@
#include <string.h>
#include <libfile.h>
#include <fs.h>
+#include <glob.h>
static struct device_node *find_target(struct device_node *root,
struct device_node *fragment)
@@ -321,12 +322,77 @@ int of_register_overlay(struct device_node *overlay)
return of_register_fixup(of_overlay_fixup, overlay);
}
+static char *of_overlay_filepattern;
+static char *of_overlay_dir;
+
+const char *of_overlay_get_dir(void)
+{
+ return of_overlay_dir;
+}
+
+void of_overlay_set_dir(const char *path)
+{
+ free(of_overlay_dir);
+ of_overlay_dir = strdup(path);
+}
+
+int of_overlay_apply_dir(struct device_node *root, const char *dir)
+{
+ char *p, *path, *n, *str;
+ int ret = 0, i;
+ glob_t g = {};
+ int globflags = GLOB_NOCHECK;
+
+ if (!dir || !*dir)
+ return 0;
+
+ p = path = strdup(of_overlay_filepattern);
+
+ while ((n = strsep_unescaped(&p, " "))) {
+ str = basprintf("%s/%s", dir, n);
+ if (!str) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = glob(str, globflags, NULL, &g);
+
+ free(str);
+
+ if (ret)
+ goto out;
+
+ globflags |= GLOB_APPEND;
+ }
+
+ for (i = 0; i < g.gl_pathc; i++)
+ of_overlay_apply_file(root, g.gl_pathv[i]);
+
+out:
+ globfree(&g);
+
+ free(path);
+
+ return ret;
+}
+
+static int of_overlay_global_fixup(struct device_node *root, void *data)
+{
+ return of_overlay_apply_dir(root, of_overlay_dir);
+}
+
static int of_overlay_init(void)
{
globalvar_add_simple_string("of_overlay_compatible", &of_overlay_compatible);
+ globalvar_add_simple_string("of_overlay_filepattern", &of_overlay_filepattern);
+ globalvar_add_simple_string("of_overlay_dir", &of_overlay_dir);
+
+ of_register_fixup(of_overlay_global_fixup, NULL);
return 0;
}
device_initcall(of_overlay_init);
BAREBOX_MAGICVAR(global.of_overlay_compatible, "space separated list of compatibles an overlay must match");
+BAREBOX_MAGICVAR(global.of_overlay_filepattern, "space separated list of filepatterns an overlay must match");
+BAREBOX_MAGICVAR(global.of_overlay_dir, "Directory to look for dt overlays");
diff --git a/include/of.h b/include/of.h
index ecc5f5101a..54185076a8 100644
--- a/include/of.h
+++ b/include/of.h
@@ -1034,6 +1034,9 @@ int of_process_overlay(struct device_node *root,
void *data);
int of_overlay_load_firmware(struct device_node *root, struct device_node *overlay);
+int of_overlay_apply_dir(struct device_node *root, const char *dir);
+const char *of_overlay_get_dir(void);
+void of_overlay_set_dir(const char *path);
#else
static inline struct device_node *of_resolve_phandles(struct device_node *root,
const struct device_node *overlay)
@@ -1071,6 +1074,21 @@ static inline int of_overlay_load_firmware(struct device_node *root, struct devi
{
return -ENOSYS;
}
+
+static inline int of_overlay_apply_dir(struct device_node *root, const char *dir)
+{
+ return 0;
+}
+
+static inline const char *of_overlay_get_dir(void)
+{
+ return NULL;
+}
+
+static inline void of_overlay_set_dir(const char *path)
+{
+}
+
#endif
#endif /* __OF_H */
--
2.29.2
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