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133 lines
4.3 KiB
Diff
133 lines
4.3 KiB
Diff
From 5378928ebac13756fc13d0b2de8dd45ace8026aa Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Mon, 15 Jul 2013 17:34:08 +0200
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Subject: [PATCH 080/203] of: provide a binding for the 'fixed-link' property
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Some Ethernet MACs have a "fixed link", and are not connected to a
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normal MDIO-managed PHY device. For those situations, a Device Tree
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binding allows to describe a "fixed link", as a "fixed-link" property
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of the Ethernet device Device Tree node.
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This patch adds:
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* A documentation for the Device Tree property "fixed-link".
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* A of_phy_register_fixed_link() OF helper, which provided an OF node
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that contains a "fixed-link" property, registers the corresponding
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fixed PHY.
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* Removes the warning on the of_phy_connect_fixed_link() that says
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new drivers should not use it, since Grant Likely indicated that
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this "fixed-link" property is indeed the way to go.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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---
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.../devicetree/bindings/net/fixed-link.txt | 26 ++++++++++++++++
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drivers/of/of_mdio.c | 36 +++++++++++++++++++---
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include/linux/of_mdio.h | 10 ++++++
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3 files changed, 68 insertions(+), 4 deletions(-)
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create mode 100644 Documentation/devicetree/bindings/net/fixed-link.txt
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/net/fixed-link.txt
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@@ -0,0 +1,26 @@
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+Fixed link Device Tree binding
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+------------------------------
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+
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+Some Ethernet MACs have a "fixed link", and are not connected to a
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+normal MDIO-managed PHY device. For those situations, a Device Tree
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+binding allows to describe a "fixed link".
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+
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+Such a fixed link situation is described within an Ethernet device
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+Device Tree node using a 'fixed-link' property, composed of 5
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+elements:
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+
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+ 1. A fake PHY ID, which must be unique accross all fixed-link PHYs in
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+ the system.
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+ 2. The duplex (1 for full-duplex, 0 for half-duplex)
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+ 3. The speed (10, 100, 1000)
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+ 4. The pause setting (1 for enabled, 0 for disabled)
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+ 5. The asym pause setting (1 for enabled, 0 for disabled)
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+
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+Example:
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+
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+ethernet@0 {
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+ ...
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+ fixed-link = <1 1 1000 0 0>;
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+ ...
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+};
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+
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--- a/drivers/of/of_mdio.c
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+++ b/drivers/of/of_mdio.c
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@@ -14,6 +14,7 @@
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#include <linux/netdevice.h>
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#include <linux/err.h>
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#include <linux/phy.h>
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+#include <linux/phy_fixed.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_mdio.h>
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@@ -215,10 +216,6 @@ EXPORT_SYMBOL(of_phy_connect);
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* @dev: pointer to net_device claiming the phy
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* @hndlr: Link state callback for the network device
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* @iface: PHY data interface type
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- *
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- * This function is a temporary stop-gap and will be removed soon. It is
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- * only to support the fs_enet, ucc_geth and gianfar Ethernet drivers. Do
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- * not call this function from new drivers.
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*/
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struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
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void (*hndlr)(struct net_device *),
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@@ -247,3 +244,34 @@ struct phy_device *of_phy_connect_fixed_
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return IS_ERR(phy) ? NULL : phy;
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}
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EXPORT_SYMBOL(of_phy_connect_fixed_link);
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+
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+#if defined(CONFIG_FIXED_PHY)
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+/**
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+ * of_phy_register_fixed_link - Parse fixed-link property and register a dummy phy
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+ * @np: pointer to the OF device node that contains the "fixed-link"
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+ * property for which a dummy phy should be registered.
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+ */
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+#define FIXED_LINK_PROPERTIES_COUNT 5
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+int of_phy_register_fixed_link(struct device_node *np)
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+{
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+ struct fixed_phy_status status = {};
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+ u32 fixed_link_props[FIXED_LINK_PROPERTIES_COUNT];
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+ int ret;
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+
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+ ret = of_property_read_u32_array(np, "fixed-link",
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+ fixed_link_props,
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+ FIXED_LINK_PROPERTIES_COUNT);
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+ if (ret < 0)
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+ return ret;
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+
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+ status.link = 1;
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+ status.duplex = fixed_link_props[1];
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+ status.speed = fixed_link_props[2];
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+ status.pause = fixed_link_props[3];
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+ status.asym_pause = fixed_link_props[4];
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+
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+ return fixed_phy_add(PHY_POLL, fixed_link_props[0],
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+ &status);
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+}
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+EXPORT_SYMBOL(of_phy_register_fixed_link);
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+#endif
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--- a/include/linux/of_mdio.h
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+++ b/include/linux/of_mdio.h
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@@ -57,4 +57,14 @@ static inline struct mii_bus *of_mdio_fi
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}
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#endif /* CONFIG_OF */
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+#if defined(CONFIG_OF) && defined(CONFIG_FIXED_PHY)
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+extern int of_phy_register_fixed_link(struct device_node *np);
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+#else
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+static inline int of_phy_register_fixed_link(struct device_node *np)
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+{
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+ return -ENOSYS;
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+}
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+#endif
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+
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+
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#endif /* __LINUX_OF_MDIO_H */
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