From 8e10b0181cf63f969705db6054ab0c16331069cf Mon Sep 17 00:00:00 2001 From: Damien Mascord Date: Tue, 13 Jul 2021 11:16:08 +1000 Subject: [PATCH] kernel: backport mdio_find_bus from 5.10.x mdio-tools (https://github.com/wkz/mdio-tools) requires the use of mdio_find_bus, which is not present in 5.4.x. This patch backports the required change from 5.10.x to 5.4.x The original patch submission for this can be found at https://patchwork.ozlabs.org/project/netdev/patch/20200201074625.8698-2-jeremy.linton@arm.com/ Signed-off-by: Damien Mascord [Add original patch description] Signed-off-by: Hauke Mehrtens --- .../771-mdio-bus-add-generic-find-bus.patch | 67 +++++++++++++++++++ ...detach-callback-to-struct-phy_driver.patch | 2 +- 2 files changed, 68 insertions(+), 1 deletion(-) create mode 100644 target/linux/generic/backport-5.4/771-mdio-bus-add-generic-find-bus.patch diff --git a/target/linux/generic/backport-5.4/771-mdio-bus-add-generic-find-bus.patch b/target/linux/generic/backport-5.4/771-mdio-bus-add-generic-find-bus.patch new file mode 100644 index 0000000000..b79fa0f18a --- /dev/null +++ b/target/linux/generic/backport-5.4/771-mdio-bus-add-generic-find-bus.patch @@ -0,0 +1,67 @@ +From ce69e2162f158d9d4a0e513971d02dabc7d14cb7 Mon Sep 17 00:00:00 2001 +From: Jeremy Linton +Date: Mon, 24 Feb 2020 16:53:58 -0600 +Subject: [PATCH] mdio_bus: Add generic mdio_find_bus() + +It appears most ethernet drivers follow one of two main strategies +for mdio bus/phy management. A monolithic model where the net driver +itself creates, probes and uses the phy, and one where an external +mdio/phy driver instantiates the mdio bus/phy and the net driver +only attaches to a known phy. Usually in this latter model the phys +are discovered via DT relationships or simply phy name/address +hardcoding. + +This is a shame because modern well behaved mdio buses are self +describing and can be probed. The mdio layer itself is fully capable +of this, yet there isn't a clean way for a standalone net driver +to attach and enumerate the discovered devices. This is because +outside of of_mdio_find_bus() there isn't a straightforward way +to acquire the mii_bus pointer. + +So, lets add a mdio_find_bus which can return the mii_bus based +only on its name. + +Signed-off-by: Jeremy Linton +Acked-by: Florian Fainelli +Signed-off-by: David S. Miller +--- + drivers/net/phy/mdio_bus.c | 17 +++++++++++++++++ + include/linux/phy.h | 1 + + 2 files changed, 18 insertions(+) + +--- a/drivers/net/phy/mdio_bus.c ++++ b/drivers/net/phy/mdio_bus.c +@@ -260,6 +260,23 @@ static struct class mdio_bus_class = { + .dev_release = mdiobus_release, + }; + ++/** ++ * mdio_find_bus - Given the name of a mdiobus, find the mii_bus. ++ * @mdio_bus_np: Pointer to the mii_bus. ++ * ++ * Returns a reference to the mii_bus, or NULL if none found. The ++ * embedded struct device will have its reference count incremented, ++ * and this must be put_deviced'ed once the bus is finished with. ++ */ ++struct mii_bus *mdio_find_bus(const char *mdio_name) ++{ ++ struct device *d; ++ ++ d = class_find_device_by_name(&mdio_bus_class, mdio_name); ++ return d ? to_mii_bus(d) : NULL; ++} ++EXPORT_SYMBOL(mdio_find_bus); ++ + #if IS_ENABLED(CONFIG_OF_MDIO) + /** + * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. +--- a/include/linux/phy.h ++++ b/include/linux/phy.h +@@ -273,6 +273,7 @@ static inline struct mii_bus *devm_mdiob + return devm_mdiobus_alloc_size(dev, 0); + } + ++struct mii_bus *mdio_find_bus(const char *mdio_name); + void devm_mdiobus_free(struct device *dev, struct mii_bus *bus); + struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr); + diff --git a/target/linux/generic/pending-5.4/703-phy-add-detach-callback-to-struct-phy_driver.patch b/target/linux/generic/pending-5.4/703-phy-add-detach-callback-to-struct-phy_driver.patch index b74b04ca59..e95cb6a4c5 100644 --- a/target/linux/generic/pending-5.4/703-phy-add-detach-callback-to-struct-phy_driver.patch +++ b/target/linux/generic/pending-5.4/703-phy-add-detach-callback-to-struct-phy_driver.patch @@ -23,7 +23,7 @@ Signed-off-by: Gabor Juhos sysfs_remove_link(&dev->dev.kobj, "phydev"); --- a/include/linux/phy.h +++ b/include/linux/phy.h -@@ -540,6 +540,12 @@ struct phy_driver { +@@ -541,6 +541,12 @@ struct phy_driver { /* Override default interrupt handling */ int (*handle_interrupt)(struct phy_device *phydev); -- 2.30.2