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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>
@@ -519,45 +520,63 @@ 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)
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