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135 lines
3.5 KiB
Diff
135 lines
3.5 KiB
Diff
From a75951217472c522c324adb0a4de3ba69d656ef5 Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Fri, 16 May 2014 16:14:04 +0200
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Subject: net: phy: extend fixed driver with fixed_phy_register()
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The existing fixed_phy_add() function has several drawbacks that
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prevents it from being used as is for OF-based declaration of fixed
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PHYs:
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* The address of the PHY on the fake bus needs to be passed, while a
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dynamic allocation is desired.
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* Since the phy_device instantiation is post-poned until the next
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mdiobus scan, there is no way to associate the fixed PHY with its
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OF node, which later prevents of_phy_connect() from finding this
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fixed PHY from a given OF node.
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To solve this, this commit introduces fixed_phy_register(), which will
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allocate an available PHY address, add the PHY using fixed_phy_add()
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and instantiate the phy_device structure associated with the provided
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OF node.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Acked-by: Florian Fainelli <f.fainelli@gmail.com>
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Acked-by: Grant Likely <grant.likely@linaro.org>
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Tested-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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--- a/drivers/net/phy/fixed.c
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+++ b/drivers/net/phy/fixed.c
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@@ -21,6 +21,7 @@
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#include <linux/phy_fixed.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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+#include <linux/of.h>
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#define MII_REGS_NUM 29
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@@ -203,6 +204,66 @@ err_regs:
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}
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EXPORT_SYMBOL_GPL(fixed_phy_add);
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+void fixed_phy_del(int phy_addr)
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+{
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+ struct fixed_mdio_bus *fmb = &platform_fmb;
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+ struct fixed_phy *fp, *tmp;
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+
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+ list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
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+ if (fp->addr == phy_addr) {
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+ list_del(&fp->node);
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+ kfree(fp);
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+ return;
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+ }
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+ }
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+}
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+EXPORT_SYMBOL_GPL(fixed_phy_del);
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+
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+static int phy_fixed_addr;
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+static DEFINE_SPINLOCK(phy_fixed_addr_lock);
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+
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+int fixed_phy_register(unsigned int irq,
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+ struct fixed_phy_status *status,
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+ struct device_node *np)
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+{
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+ struct fixed_mdio_bus *fmb = &platform_fmb;
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+ struct phy_device *phy;
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+ int phy_addr;
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+ int ret;
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+
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+ /* Get the next available PHY address, up to PHY_MAX_ADDR */
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+ spin_lock(&phy_fixed_addr_lock);
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+ if (phy_fixed_addr == PHY_MAX_ADDR) {
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+ spin_unlock(&phy_fixed_addr_lock);
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+ return -ENOSPC;
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+ }
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+ phy_addr = phy_fixed_addr++;
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+ spin_unlock(&phy_fixed_addr_lock);
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+
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+ ret = fixed_phy_add(PHY_POLL, phy_addr, status);
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+ if (ret < 0)
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+ return ret;
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+
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+ phy = get_phy_device(fmb->mii_bus, phy_addr, false);
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+ if (!phy || IS_ERR(phy)) {
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+ fixed_phy_del(phy_addr);
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+ return -EINVAL;
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+ }
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+
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+ of_node_get(np);
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+ phy->dev.of_node = np;
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+
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+ ret = phy_device_register(phy);
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+ if (ret) {
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+ phy_device_free(phy);
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+ of_node_put(np);
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+ fixed_phy_del(phy_addr);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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static int __init fixed_mdio_bus_init(void)
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{
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struct fixed_mdio_bus *fmb = &platform_fmb;
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--- a/include/linux/phy_fixed.h
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+++ b/include/linux/phy_fixed.h
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@@ -9,15 +9,26 @@ struct fixed_phy_status {
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int asym_pause;
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};
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+struct device_node;
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+
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#ifdef CONFIG_FIXED_PHY
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extern int fixed_phy_add(unsigned int irq, int phy_id,
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struct fixed_phy_status *status);
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+extern int fixed_phy_register(unsigned int irq,
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+ struct fixed_phy_status *status,
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+ struct device_node *np);
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#else
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static inline int fixed_phy_add(unsigned int irq, int phy_id,
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struct fixed_phy_status *status)
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{
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return -ENODEV;
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}
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+static inline int fixed_phy_register(unsigned int irq,
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+ struct fixed_phy_status *status,
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+ struct device_node *np)
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+{
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+ return -ENODEV;
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+}
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#endif /* CONFIG_FIXED_PHY */
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/*
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