[PATCH 2/3] blspec: add new blspec.compatible.extra variable

[Rouven Czerwinski <r.czerwinski@pengutronix.de>]

The blspec.compatible.extra variable will be used to specify extra
compatibles that are also used to match during bootloader specification
entry parsing. This means that even if your internal barebox device tree
machine compatible is "vendor,bareboxcompatible", but your bootloader
specification device tree contains "vendor,linuxcompatible", it is
possible to boot this entry by setting blspec.compatible.extra to
"vendor,linuxcompatible".

More than one compatible is possible as well, the compatibles will need
to be space separated (since "," is already used for the vendor hardware
distinction).

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
---
 common/blspec.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/common/blspec.c b/common/blspec.c
index f8d47f20d2..e361a02333 100644
--- a/common/blspec.c
+++ b/common/blspec.c
@@ -19,10 +19,20 @@
 #include <net.h>
 #include <fs.h>
 #include <of.h>
+#include <magicvar.h>
+#include <linux/list.h>
 #include <linux/stat.h>
 #include <linux/err.h>
 #include <mtd/ubi-user.h>
 
+struct list_head *blspec_extra_list;
+char *blspec_extra_string;
+
+struct blspec_extra_entry {
+	char *compatible;
+	struct list_head list;
+};
+
 /*
  * blspec_entry_var_set - set a variable to a value
  */
@@ -830,8 +840,54 @@ static int blspec_bootentry_provider(struct bootentries *bootentries,
 	return found;
 }
 
+static int blspec_extra_set(struct param_d *p, void *priv)
+{
+	struct blspec_extra_entry *entry, *tmp;
+	char *str = blspec_extra_string;
+	char *temp = str;
+	unsigned int len;
+
+	if (blspec_extra_list) {
+		list_for_each_entry_safe(entry, tmp, blspec_extra_list, list) {
+			list_del(&entry->list);
+			free(entry->compatible);
+			free(entry);
+		}
+		blspec_extra_list = NULL;
+	}
+
+	while(str++) {
+		if (*str == ' ' || *str == 0) {
+			len = temp - str;
+			if(len > 126) {
+				len = 127;
+			}
+			entry = calloc(1, sizeof(struct blspec_extra_entry));
+			entry->compatible = xzalloc(len + 1);
+			memcpy(entry->compatible, temp, len);
+
+			if (blspec_extra_list == NULL) {
+				INIT_LIST_HEAD(&entry->list);
+				blspec_extra_list = &entry->list;
+			} else {
+				list_add_tail(&entry->list, blspec_extra_list);
+			}
+
+			temp = str + 1;
+		}
+		if (*str == 0)
+			break;
+	}
+
+	return 0;
+}
+
 static int blspec_init(void)
 {
+	dev_add_param_string(&global_device, "blspec.compatible.extra",
+			     blspec_extra_set, NULL, &blspec_extra_string, blspec_extra_list);
 	return bootentry_register_provider(blspec_bootentry_provider);
 }
 device_initcall(blspec_init);
+
+BAREBOX_MAGICVAR(global.blspec.compatible.extra, "Extra compatible to also match during bootloader entry matching");
-- 
2.42.0