bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0116-of-configfs-Use-of_overlay_fdt_apply-API-call.patch b/target/linux/bcm27xx/patches-5.4/950-0116-of-configfs-Use-of_overlay_fdt_apply-API-call.patch
new file mode 100644
index 0000000000..8f71b2dbd8
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0116-of-configfs-Use-of_overlay_fdt_apply-API-call.patch
@@ -0,0 +1,114 @@
+From acb49b81500dd9d65027587767db25ead0b457af Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Thu, 14 Jun 2018 15:07:26 +0100
+Subject: [PATCH] of: configfs: Use of_overlay_fdt_apply API call
+
+The published API to the dynamic overlay application mechanism now
+takes a Flattened Device Tree blob as input so that it can manage the
+lifetime of the unflattened tree. Conveniently, the new API call -
+of_overlay_fdt_apply - is virtually a drop-in replacement for
+create_overlay, which can now be deleted.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/of/configfs.c | 47 +++++++------------------------------------
+ 1 file changed, 7 insertions(+), 40 deletions(-)
+
+--- a/drivers/of/configfs.c
++++ b/drivers/of/configfs.c
+@@ -40,41 +40,6 @@ struct cfs_overlay_item {
+ 	int			dtbo_size;
+ };
+ 
+-static int create_overlay(struct cfs_overlay_item *overlay, void *blob)
+-{
+-	int err;
+-
+-	/* unflatten the tree */
+-	of_fdt_unflatten_tree(blob, NULL, &overlay->overlay);
+-	if (overlay->overlay == NULL) {
+-		pr_err("%s: failed to unflatten tree\n", __func__);
+-		err = -EINVAL;
+-		goto out_err;
+-	}
+-	pr_debug("%s: unflattened OK\n", __func__);
+-
+-	/* mark it as detached */
+-	of_node_set_flag(overlay->overlay, OF_DETACHED);
+-
+-	/* perform resolution */
+-	err = of_resolve_phandles(overlay->overlay);
+-	if (err != 0) {
+-		pr_err("%s: Failed to resolve tree\n", __func__);
+-		goto out_err;
+-	}
+-	pr_debug("%s: resolved OK\n", __func__);
+-
+-	err = of_overlay_apply(overlay->overlay, &overlay->ov_id);
+-	if (err < 0) {
+-		pr_err("%s: Failed to create overlay (err=%d)\n",
+-				__func__, err);
+-		goto out_err;
+-	}
+-
+-out_err:
+-	return err;
+-}
+-
+ static inline struct cfs_overlay_item *to_cfs_overlay_item(
+ 		struct config_item *item)
+ {
+@@ -115,7 +80,8 @@ static ssize_t cfs_overlay_item_path_sto
+ 	if (err != 0)
+ 		goto out_err;
+ 
+-	err = create_overlay(overlay, (void *)overlay->fw->data);
++	err = of_overlay_fdt_apply((void *)overlay->fw->data,
++				   (u32)overlay->fw->size, &overlay->ov_id);
+ 	if (err != 0)
+ 		goto out_err;
+ 
+@@ -136,7 +102,7 @@ static ssize_t cfs_overlay_item_status_s
+ 	struct cfs_overlay_item *overlay = to_cfs_overlay_item(item);
+ 
+ 	return sprintf(page, "%s\n",
+-			overlay->ov_id >= 0 ? "applied" : "unapplied");
++			overlay->ov_id > 0 ? "applied" : "unapplied");
+ }
+ 
+ CONFIGFS_ATTR(cfs_overlay_item_, path);
+@@ -188,7 +154,8 @@ ssize_t cfs_overlay_item_dtbo_write(stru
+ 
+ 	overlay->dtbo_size = count;
+ 
+-	err = create_overlay(overlay, overlay->dtbo);
++	err = of_overlay_fdt_apply(overlay->dtbo, overlay->dtbo_size,
++				   &overlay->ov_id);
+ 	if (err != 0)
+ 		goto out_err;
+ 
+@@ -198,6 +165,7 @@ out_err:
+ 	kfree(overlay->dtbo);
+ 	overlay->dtbo = NULL;
+ 	overlay->dtbo_size = 0;
++	overlay->ov_id = 0;
+ 
+ 	return err;
+ }
+@@ -213,7 +181,7 @@ static void cfs_overlay_release(struct c
+ {
+ 	struct cfs_overlay_item *overlay = to_cfs_overlay_item(item);
+ 
+-	if (overlay->ov_id >= 0)
++	if (overlay->ov_id > 0)
+ 		of_overlay_remove(&overlay->ov_id);
+ 	if (overlay->fw)
+ 		release_firmware(overlay->fw);
+@@ -241,7 +209,6 @@ static struct config_item *cfs_overlay_g
+ 	overlay = kzalloc(sizeof(*overlay), GFP_KERNEL);
+ 	if (!overlay)
+ 		return ERR_PTR(-ENOMEM);
+-	overlay->ov_id = -1;
+ 
+ 	config_item_init_type_name(&overlay->item, name, &cfs_overlay_type);
+ 	return &overlay->item;