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8e10b0181c
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 <tusker@tusker.org> [Add original patch description] Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
68 lines
2.4 KiB
Diff
68 lines
2.4 KiB
Diff
From ce69e2162f158d9d4a0e513971d02dabc7d14cb7 Mon Sep 17 00:00:00 2001
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From: Jeremy Linton <jeremy.linton@arm.com>
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Date: Mon, 24 Feb 2020 16:53:58 -0600
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Subject: [PATCH] mdio_bus: Add generic mdio_find_bus()
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It appears most ethernet drivers follow one of two main strategies
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for mdio bus/phy management. A monolithic model where the net driver
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itself creates, probes and uses the phy, and one where an external
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mdio/phy driver instantiates the mdio bus/phy and the net driver
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only attaches to a known phy. Usually in this latter model the phys
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are discovered via DT relationships or simply phy name/address
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hardcoding.
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This is a shame because modern well behaved mdio buses are self
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describing and can be probed. The mdio layer itself is fully capable
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of this, yet there isn't a clean way for a standalone net driver
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to attach and enumerate the discovered devices. This is because
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outside of of_mdio_find_bus() there isn't a straightforward way
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to acquire the mii_bus pointer.
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So, lets add a mdio_find_bus which can return the mii_bus based
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only on its name.
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Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
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Acked-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/phy/mdio_bus.c | 17 +++++++++++++++++
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include/linux/phy.h | 1 +
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2 files changed, 18 insertions(+)
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--- a/drivers/net/phy/mdio_bus.c
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+++ b/drivers/net/phy/mdio_bus.c
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@@ -260,6 +260,23 @@ static struct class mdio_bus_class = {
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.dev_release = mdiobus_release,
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};
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+/**
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+ * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
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+ * @mdio_bus_np: Pointer to the mii_bus.
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+ *
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+ * Returns a reference to the mii_bus, or NULL if none found. The
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+ * embedded struct device will have its reference count incremented,
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+ * and this must be put_deviced'ed once the bus is finished with.
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+ */
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+struct mii_bus *mdio_find_bus(const char *mdio_name)
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+{
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+ struct device *d;
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+
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+ d = class_find_device_by_name(&mdio_bus_class, mdio_name);
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+ return d ? to_mii_bus(d) : NULL;
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+}
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+EXPORT_SYMBOL(mdio_find_bus);
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+
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#if IS_ENABLED(CONFIG_OF_MDIO)
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/**
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* of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
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--- a/include/linux/phy.h
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+++ b/include/linux/phy.h
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@@ -273,6 +273,7 @@ static inline struct mii_bus *devm_mdiob
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return devm_mdiobus_alloc_size(dev, 0);
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}
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+struct mii_bus *mdio_find_bus(const char *mdio_name);
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void devm_mdiobus_free(struct device *dev, struct mii_bus *bus);
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struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
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