The switch devices are component slaves. Such devices have a "switch"
property in the DSA device tree which is a phandle to the switch
device. When the slaves bind they register to DSA. So the DSA can
match the switch to the correct switch instance in the device tree,
keep a reference to the device tree node during parsing of the device
tree.
Signed-off-by: Andrew Lunn <and...@lunn.ch>
---
Documentation/devicetree/bindings/net/dsa/dsa.txt | 2 ++
include/net/dsa.h | 3 +++
net/dsa/dsa.c | 6 +++++-
3 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.txt
b/Documentation/devicetree/bindings/net/dsa/dsa.txt
index 5fdbbcdf8c4b..f99e5694a61f 100644
--- a/Documentation/devicetree/bindings/net/dsa/dsa.txt
+++ b/Documentation/devicetree/bindings/net/dsa/dsa.txt
@@ -27,6 +27,8 @@ Each of these switch child nodes should have the following
required properties:
A switch child node has the following optional property:
+- switch : A phandle to a switch device.
+
- eeprom-length : Set to the length of an EEPROM connected to
the
switch. Must be set if the switch can not detect
the presence and/or size of a connected EEPROM,
diff --git a/include/net/dsa.h b/include/net/dsa.h
index f6b8001a500f..ea4cfdf1b549 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -48,6 +48,9 @@ struct dsa_chip_data {
*/
struct device_node *of_node;
+ /* Device tree node pointer for the switch chip device. */
+ struct device_node *of_chip;
+
/*
* The names of the switch's ports. Use "cpu" to
* designate the switch port that the cpu is connected to,
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index a139c35061a1..f2af801554ec 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -662,7 +662,7 @@ static void dsa_of_free_platform_data(struct
dsa_platform_data *pd)
static int dsa_of_probe(struct device *dev, struct dsa_platform_data *pd)
{
struct device_node *np = dev->of_node;
- struct device_node *child, *mdio, *ethernet, *port;
+ struct device_node *child, *chip, *mdio, *ethernet, *port;
struct mii_bus *mdio_bus, *mdio_bus_switch;
struct net_device *ethernet_dev;
struct dsa_chip_data *cd;
@@ -712,6 +712,10 @@ static int dsa_of_probe(struct device *dev, struct
dsa_platform_data *pd)
cd->of_node = child;
+ chip = of_parse_phandle(child, "switch", 0);
+ if (chip)
+ cd->of_chip = chip;
+
/* When assigning the host device, increment its refcount */
cd->host_dev = get_device(&mdio_bus->dev);
--
2.7.0
