kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 179 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/716-v5.4-net-sfp-move-fwnode-parsing-into-sfp-bus-layer.patch b/target/linux/generic/backport-5.4/716-v5.4-net-sfp-move-fwnode-parsing-into-sfp-bus-layer.patch
new file mode 100644
index 0000000000..27ab78f3ee
--- /dev/null
+++ b/target/linux/generic/backport-5.4/716-v5.4-net-sfp-move-fwnode-parsing-into-sfp-bus-layer.patch
@@ -0,0 +1,179 @@
+From 4054955f0da08c81d42220cb445820d474f1ac92 Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@armlinux.org.uk>
+Date: Sat, 14 Sep 2019 14:21:22 +0100
+Subject: [PATCH 614/660] net: sfp: move fwnode parsing into sfp-bus layer
+
+Rather than parsing the sfp firmware node in phylink, parse it in the
+sfp-bus code, so we can re-use this code for PHYs without having to
+duplicate the parsing.
+
+Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
+---
+ drivers/net/phy/phylink.c | 21 ++++---------
+ drivers/net/phy/sfp-bus.c | 65 +++++++++++++++++++++++++--------------
+ include/linux/sfp.h       | 10 +++---
+ 3 files changed, 53 insertions(+), 43 deletions(-)
+
+--- a/drivers/net/phy/phylink.c
++++ b/drivers/net/phy/phylink.c
+@@ -538,26 +538,17 @@ static const struct sfp_upstream_ops sfp
+ static int phylink_register_sfp(struct phylink *pl,
+ 				struct fwnode_handle *fwnode)
+ {
+-	struct fwnode_reference_args ref;
++	struct sfp_bus *bus;
+ 	int ret;
+ 
+-	if (!fwnode)
+-		return 0;
+-
+-	ret = fwnode_property_get_reference_args(fwnode, "sfp", NULL,
+-						 0, 0, &ref);
+-	if (ret < 0) {
+-		if (ret == -ENOENT)
+-			return 0;
+-
+-		netdev_err(pl->netdev, "unable to parse \"sfp\" node: %d\n",
+-			   ret);
++	bus = sfp_register_upstream_node(fwnode, pl, &sfp_phylink_ops);
++	if (IS_ERR(bus)) {
++		ret = PTR_ERR(bus);
++		netdev_err(pl->netdev, "unable to attach SFP bus: %d\n", ret);
+ 		return ret;
+ 	}
+ 
+-	pl->sfp_bus = sfp_register_upstream(ref.fwnode, pl, &sfp_phylink_ops);
+-	if (!pl->sfp_bus)
+-		return -ENOMEM;
++	pl->sfp_bus = bus;
+ 
+ 	return 0;
+ }
+--- a/drivers/net/phy/sfp-bus.c
++++ b/drivers/net/phy/sfp-bus.c
+@@ -3,6 +3,7 @@
+ #include <linux/list.h>
+ #include <linux/mutex.h>
+ #include <linux/phylink.h>
++#include <linux/property.h>
+ #include <linux/rtnetlink.h>
+ #include <linux/slab.h>
+ 
+@@ -444,45 +445,63 @@ static void sfp_upstream_clear(struct sf
+ }
+ 
+ /**
+- * sfp_register_upstream() - Register the neighbouring device
+- * @fwnode: firmware node for the SFP bus
++ * sfp_register_upstream_node() - parse and register the neighbouring device
++ * @fwnode: firmware node for the parent device (MAC or PHY)
+  * @upstream: the upstream private data
+  * @ops: the upstream's &struct sfp_upstream_ops
+  *
+- * Register the upstream device (eg, PHY) with the SFP bus. MAC drivers
+- * should use phylink, which will call this function for them. Returns
+- * a pointer to the allocated &struct sfp_bus.
++ * Parse the parent device's firmware node for a SFP bus, and register the
++ * SFP bus using sfp_register_upstream().
+  *
+- * On error, returns %NULL.
++ * Returns: on success, a pointer to the sfp_bus structure,
++ *	    %NULL if no SFP is specified,
++ * 	    on failure, an error pointer value:
++ * 		corresponding to the errors detailed for
++ * 		fwnode_property_get_reference_args().
++ * 	        %-ENOMEM if we failed to allocate the bus.
++ *		an error from the upstream's connect_phy() method.
+  */
+-struct sfp_bus *sfp_register_upstream(struct fwnode_handle *fwnode,
+-				      void *upstream,
+-				      const struct sfp_upstream_ops *ops)
+-{
+-	struct sfp_bus *bus = sfp_bus_get(fwnode);
+-	int ret = 0;
+-
+-	if (bus) {
+-		rtnl_lock();
+-		bus->upstream_ops = ops;
+-		bus->upstream = upstream;
++struct sfp_bus *sfp_register_upstream_node(struct fwnode_handle *fwnode,
++					   void *upstream,
++					   const struct sfp_upstream_ops *ops)
++{
++	struct fwnode_reference_args ref;
++	struct sfp_bus *bus;
++	int ret;
+ 
+-		if (bus->sfp) {
+-			ret = sfp_register_bus(bus);
+-			if (ret)
+-				sfp_upstream_clear(bus);
+-		}
+-		rtnl_unlock();
++	ret = fwnode_property_get_reference_args(fwnode, "sfp", NULL,
++						 0, 0, &ref);
++	if (ret == -ENOENT)
++		return NULL;
++	else if (ret < 0)
++		return ERR_PTR(ret);
++
++	bus = sfp_bus_get(ref.fwnode);
++	fwnode_handle_put(ref.fwnode);
++	if (!bus)
++		return ERR_PTR(-ENOMEM);
++
++	rtnl_lock();
++	bus->upstream_ops = ops;
++	bus->upstream = upstream;
++
++	if (bus->sfp) {
++		ret = sfp_register_bus(bus);
++		if (ret)
++			sfp_upstream_clear(bus);
++	} else {
++		ret = 0;
+ 	}
++	rtnl_unlock();
+ 
+ 	if (ret) {
+ 		sfp_bus_put(bus);
+-		bus = NULL;
++		bus = ERR_PTR(ret);
+ 	}
+ 
+ 	return bus;
+ }
+-EXPORT_SYMBOL_GPL(sfp_register_upstream);
++EXPORT_SYMBOL_GPL(sfp_register_upstream_node);
+ 
+ /**
+  * sfp_unregister_upstream() - Unregister sfp bus
+--- a/include/linux/sfp.h
++++ b/include/linux/sfp.h
+@@ -508,9 +508,9 @@ int sfp_get_module_eeprom(struct sfp_bus
+ 			  u8 *data);
+ void sfp_upstream_start(struct sfp_bus *bus);
+ void sfp_upstream_stop(struct sfp_bus *bus);
+-struct sfp_bus *sfp_register_upstream(struct fwnode_handle *fwnode,
+-				      void *upstream,
+-				      const struct sfp_upstream_ops *ops);
++struct sfp_bus *sfp_register_upstream_node(struct fwnode_handle *fwnode,
++					   void *upstream,
++					   const struct sfp_upstream_ops *ops);
+ void sfp_unregister_upstream(struct sfp_bus *bus);
+ #else
+ static inline int sfp_parse_port(struct sfp_bus *bus,
+@@ -553,11 +553,11 @@ static inline void sfp_upstream_stop(str
+ {
+ }
+ 
+-static inline struct sfp_bus *sfp_register_upstream(
++static inline struct sfp_bus *sfp_register_upstream_node(
+ 	struct fwnode_handle *fwnode, void *upstream,
+ 	const struct sfp_upstream_ops *ops)
+ {
+-	return (struct sfp_bus *)-1;
++	return NULL;
+ }
+ 
+ static inline void sfp_unregister_upstream(struct sfp_bus *bus)