[PATCH RFC net-next 03/13] net: eth: Add helpers to find DPLL pin firmware node
From: Ivan Vecera <ivecera@redhat.com>
Date: 2025-12-11 19:48:41
Also in:
intel-wired-lan, linux-devicetree, linux-rdma, lkml
Subsystem:
networking drivers, networking [general], the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Add helper functions to retrieve a DPLL pin's firmware node handle based on the "dpll-pins" and "dpll-pin-names" device tree properties. * fwnode_get_dpll_pin_node(): matches the given name against the "dpll-pin-names" property to find the correct index, then retrieves the reference from "dpll-pins". * device_get_dpll_pin_node(): a wrapper around the fwnode helper for convenience when using a `struct device`. These helpers simplify the process for Ethernet drivers to look up their associated DPLL pins defined in the Device Tree, which can then be passed to the DPLL subsystem to acquire the pin object. Signed-off-by: Ivan Vecera <ivecera@redhat.com> --- include/linux/etherdevice.h | 4 ++++ net/ethernet/eth.c | 20 ++++++++++++++++++++ 2 files changed, 24 insertions(+)
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 9a1eacf35d370..e342e522ea0e8 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h@@ -35,6 +35,10 @@ int nvmem_get_mac_address(struct device *dev, void *addrbuf); int device_get_mac_address(struct device *dev, char *addr); int device_get_ethdev_address(struct device *dev, struct net_device *netdev); int fwnode_get_mac_address(struct fwnode_handle *fwnode, char *addr); +struct fwnode_handle *fwnode_get_dpll_pin_node(struct fwnode_handle *fwnode, + const char *name); +struct fwnode_handle *device_get_dpll_pin_node(struct device *dev, + const char *name); u32 eth_get_headlen(const struct net_device *dev, const void *data, u32 len); __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 13a63b48b7eeb..9081dc02ba91e 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c@@ -639,3 +639,23 @@ int device_get_ethdev_address(struct device *dev, struct net_device *netdev) return ret; } EXPORT_SYMBOL(device_get_ethdev_address); + +struct fwnode_handle *fwnode_get_dpll_pin_node(struct fwnode_handle *fwnode, + const char *name) +{ + int index = 0; + + if (name) + index = fwnode_property_match_string(fwnode, "dpll-pin-names", + name); + + return fwnode_find_reference(fwnode, "dpll-pins", index); +} +EXPORT_SYMBOL(fwnode_get_dpll_pin_node); + +struct fwnode_handle *device_get_dpll_pin_node(struct device *dev, + const char *name) +{ + return fwnode_get_dpll_pin_node(dev_fwnode(dev), name); +} +EXPORT_SYMBOL(device_get_dpll_pin_node);
--
2.51.2