[PATCH u-boot-net v3 03/14] net: introduce helpers to get PHY ofnode from MAC

Marek Behún
2022-03-29T20:10:22Z

Add helpers ofnode_get_phy_node() and dev_get_phy_node() and use it in
net/mdio-uclass.c function dm_eth_connect_phy_handle(). Also add
corresponding UT test.

This is useful because other part's of U-Boot may want to get PHY ofnode
without connecting a PHY.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
arch/sandbox/dts/test.dts | 11 +++++++++++
drivers/core/ofnode.c | 21 +++++++++++++++++++++
drivers/core/read.c | 5 +++++
include/dm/ofnode.h | 14 ++++++++++++++
include/dm/read.h | 19 +++++++++++++++++++
net/mdio-uclass.c | 24 ++++++------------------
test/dm/ofnode.c | 18 ++++++++++++++++++
7 files changed, 94 insertions(+), 18 deletions(-)

diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 48ca3e1e47..5248beecd7 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -527,6 +527,13 @@
fake-host-hwaddr = [00 00 66 44 22 22];
};

+ phy_eth0: phy-test-eth {
+ compatible = "sandbox,eth";
+ reg = <0x10007000 0x1000>;
+ fake-host-hwaddr = [00 00 66 44 22 77];
+ phy-handle = <&ethphy1>;
+ };
+
dsa_eth0: dsa-test-eth {
compatible = "sandbox,eth";
reg = <0x10006000 0x1000>;
@@ -1563,6 +1570,10 @@

mdio: mdio-test {
compatible = "sandbox,mdio";
+
+ ethphy1: ethernet-phy@1 {
+ reg = <1>;
+ };
};

pm-bus-test {
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 709bea272a..eaad2c989b 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -1162,3 +1162,24 @@ const char *ofnode_conf_read_str(const char *prop_name)

return ofnode_read_string(node, prop_name);
}
+
+ofnode ofnode_get_phy_node(ofnode node)
+{
+ /* DT node properties that reference a PHY node */
+ static const char * const phy_handle_str[] = {
+ "phy-handle", "phy", "phy-device",
+ };
+ struct ofnode_phandle_args args = {
+ .node = ofnode_null()
+ };
+ int i;
+
+ assert(ofnode_valid(node));
+
+ for (i = 0; i < ARRAY_SIZE(phy_handle_str); i++)
+ if (!ofnode_parse_phandle_with_args(node, phy_handle_str[i],
+ NULL, 0, 0, &args))
+ break;
+
+ return args.node;
+}
diff --git a/drivers/core/read.c b/drivers/core/read.c
index 31f9e78a06..7ff100218d 100644
--- a/drivers/core/read.c
+++ b/drivers/core/read.c
@@ -398,3 +398,8 @@ int dev_decode_display_timing(const struct udevice *dev, int index,
{
return ofnode_decode_display_timing(dev_ofnode(dev), index, config);
}
+
+ofnode dev_get_phy_node(const struct udevice *dev)
+{
+ return ofnode_get_phy_node(dev_ofnode(dev));
+}
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index 0cb324c8b0..8164386043 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -1204,4 +1204,18 @@ int ofnode_conf_read_int(const char *prop_name, int default_val);
*/
const char *ofnode_conf_read_str(const char *prop_name);

+/**
+ * ofnode_get_phy_node() - Get PHY node for a MAC (if not fixed-link)
+ *
+ * This function parses PHY handle from the Ethernet controller's ofnode
+ * (trying all possible PHY handle property names), and returns the PHY ofnode.
+ *
+ * Before this is used, ofnode_phy_is_fixed_link() should be checked first, and
+ * if the result to that is true, this function should not be called.
+ *
+ * @eth_node: ofnode belonging to the Ethernet controller
+ * Return: ofnode of the PHY, if it exists, otherwise an invalid ofnode
+ */
+ofnode ofnode_get_phy_node(ofnode eth_node);
+
#endif
diff --git a/include/dm/read.h b/include/dm/read.h
index 233af3c063..899eb813fd 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -743,6 +743,20 @@ int dev_read_pci_bus_range(const struct udevice *dev, struct resource *res);
int dev_decode_display_timing(const struct udevice *dev, int index,
struct display_timing *config);

+/**
+ * dev_get_phy_node() - Get PHY node for a MAC (if not fixed-link)
+ *
+ * This function parses PHY handle from the Ethernet controller's ofnode
+ * (trying all possible PHY handle property names), and returns the PHY ofnode.
+ *
+ * Before this is used, ofnode_phy_is_fixed_link() should be checked first, and
+ * if the result to that is true, this function should not be called.
+ *
+ * @dev: device representing the MAC
+ * Return: ofnode of the PHY, if it exists, otherwise an invalid ofnode
+ */
+ofnode dev_get_phy_node(const struct udevice *dev);
+
#else /* CONFIG_DM_DEV_READ_INLINE is enabled */
#include <asm/global_data.h>

@@ -1092,6 +1106,11 @@ static inline int dev_decode_display_timing(const struct udevice *dev,
return ofnode_decode_display_timing(dev_ofnode(dev), index, config);
}

+static inline ofnode dev_get_phy_node(const struct udevice *dev)
+{
+ return ofnode_get_phy_node(dev_ofnode(dev));
+}
+
#endif /* CONFIG_DM_DEV_READ_INLINE */

/**
diff --git a/net/mdio-uclass.c b/net/mdio-uclass.c
index 649dc60f73..233b70171b 100644
--- a/net/mdio-uclass.c
+++ b/net/mdio-uclass.c
@@ -20,11 +20,6 @@ static const char * const phy_mode_str[] = {
"phy-mode", "phy-connection-type"
};

-/* DT node properties that reference a PHY node */
-static const char * const phy_handle_str[] = {
- "phy-handle", "phy", "phy-device"
-};
-
void dm_mdio_probe_devices(void)
{
struct udevice *it;
@@ -137,23 +132,16 @@ static struct phy_device *dm_eth_connect_phy_handle(struct udevice *ethdev,
u32 phy_addr;
struct udevice *mdiodev;
struct phy_device *phy;
- struct ofnode_phandle_args phandle = {.node = ofnode_null()};
ofnode phynode;
- int i;

if (CONFIG_IS_ENABLED(PHY_FIXED) &&
ofnode_phy_is_fixed_link(dev_ofnode(ethdev), &phynode)) {
phy = phy_connect(NULL, 0, ethdev, interface);
- phandle.node = phynode;
goto out;
}

- for (i = 0; i < ARRAY_SIZE(phy_handle_str); i++)
- if (!dev_read_phandle_with_args(ethdev, phy_handle_str[i], NULL,
- 0, 0, &phandle))
- break;
-
- if (!ofnode_valid(phandle.node)) {
+ phynode = dev_get_phy_node(ethdev);
+ if (!ofnode_valid(phynode)) {
dev_dbg(ethdev, "can't find PHY node\n");
return NULL;
}
@@ -162,16 +150,16 @@ static struct phy_device *dm_eth_connect_phy_handle(struct udevice *ethdev,
* reading 'reg' directly should be fine. This is a PHY node, the
* address is always size 1 and requires no translation
*/
- if (ofnode_read_u32(phandle.node, "reg", &phy_addr)) {
+ if (ofnode_read_u32(phynode, "reg", &phy_addr)) {
dev_dbg(ethdev, "missing reg property in phy node\n");
return NULL;
}

if (uclass_get_device_by_ofnode(UCLASS_MDIO,
- ofnode_get_parent(phandle.node),
+ ofnode_get_parent(phynode),
&mdiodev)) {
dev_dbg(ethdev, "can't find MDIO bus for node %s\n",
- ofnode_get_name(ofnode_get_parent(phandle.node)));
+ ofnode_get_name(ofnode_get_parent(phynode)));
return NULL;
}

@@ -179,7 +167,7 @@ static struct phy_device *dm_eth_connect_phy_handle(struct udevice *ethdev,

out:
if (phy)
- phy->node = phandle.node;
+ phy->node = phynode;

return phy;
}
diff --git a/test/dm/ofnode.c b/test/dm/ofnode.c
index dab0480a42..500c63aef5 100644
--- a/test/dm/ofnode.c
+++ b/test/dm/ofnode.c
@@ -447,3 +447,21 @@ static int dm_test_ofnode_string_err(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_ofnode_string_err, UT_TESTF_LIVE_TREE);
+
+static int dm_test_ofnode_get_phy(struct unit_test_state *uts)
+{
+ ofnode eth_node, phy_node;
+ u32 reg;
+
+ eth_node = ofnode_path("/phy-test-eth");
+ ut_assert(ofnode_valid(eth_node));
+
+ phy_node = ofnode_get_phy_node(eth_node);
+ ut_assert(ofnode_valid(phy_node));
+
+ reg = ofnode_read_u32_default(phy_node, "reg", -1U);
+ ut_asserteq_64(0x1, reg);
+
+ return 0;
+}
+DM_TEST(dm_test_ofnode_get_phy, 0);
--
2.34.1