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170 lines
5.3 KiB
170 lines
5.3 KiB
From 3be2a49e5c08d268f8af0dd4fe89a24ea8cdc339 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 16:14:05 +0200
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Subject: of: provide a binding for fixed link PHYs
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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" using a special PHY node.
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This patch adds:
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* A documentation for the fixed PHY Device Tree binding.
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* An of_phy_is_fixed_link() function that an Ethernet driver can call
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on its PHY phandle to find out whether it's a fixed link PHY or
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not. It should typically be used to know if
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of_phy_register_fixed_link() should be called.
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* An of_phy_register_fixed_link() function that instantiates the
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fixed PHY into the PHY subsystem, so that when the driver calls
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of_phy_connect(), the PHY device associated to the OF node will be
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found.
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These two additional functions also support the old fixed-link Device
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Tree binding used on PowerPC platforms, so that ultimately, the
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network device drivers for those platforms could be converted to use
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of_phy_is_fixed_link() and of_phy_register_fixed_link() instead of
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of_phy_connect_fixed_link(), while keeping compatibility with their
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respective Device Tree bindings.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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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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--- /dev/null
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+++ b/Documentation/devicetree/bindings/net/fixed-link.txt
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@@ -0,0 +1,30 @@
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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 by creating a 'fixed-link'
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+sub-node of the Ethernet MAC device node, with the following
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+properties:
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+
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+* 'speed' (integer, mandatory), to indicate the link speed. Accepted
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+ values are 10, 100 and 1000
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+* 'full-duplex' (boolean, optional), to indicate that full duplex is
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+ used. When absent, half duplex is assumed.
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+* 'pause' (boolean, optional), to indicate that pause should be
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+ enabled.
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+* 'asym-pause' (boolean, optional), to indicate that asym_pause should
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+ be enabled.
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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 {
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+ speed = <1000>;
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+ full-duplex;
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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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@@ -280,3 +281,69 @@ struct phy_device *of_phy_attach(struct
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return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy;
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}
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EXPORT_SYMBOL(of_phy_attach);
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+
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+#if defined(CONFIG_FIXED_PHY)
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+/*
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+ * of_phy_is_fixed_link() and of_phy_register_fixed_link() must
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+ * support two DT bindings:
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+ * - the old DT binding, where 'fixed-link' was a property with 5
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+ * cells encoding various informations about the fixed PHY
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+ * - the new DT binding, where 'fixed-link' is a sub-node of the
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+ * Ethernet device.
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+ */
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+bool of_phy_is_fixed_link(struct device_node *np)
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+{
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+ struct device_node *dn;
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+ int len;
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+
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+ /* New binding */
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+ dn = of_get_child_by_name(np, "fixed-link");
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+ if (dn) {
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+ of_node_put(dn);
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+ return true;
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+ }
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+
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+ /* Old binding */
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+ if (of_get_property(np, "fixed-link", &len) &&
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+ len == (5 * sizeof(__be32)))
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+ return true;
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+
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+ return false;
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+}
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+EXPORT_SYMBOL(of_phy_is_fixed_link);
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+
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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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+ struct device_node *fixed_link_node;
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+ const __be32 *fixed_link_prop;
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+ int len;
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+
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+ /* New binding */
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+ fixed_link_node = of_get_child_by_name(np, "fixed-link");
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+ if (fixed_link_node) {
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+ status.link = 1;
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+ status.duplex = of_property_read_bool(np, "full-duplex");
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+ if (of_property_read_u32(fixed_link_node, "speed", &status.speed))
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+ return -EINVAL;
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+ status.pause = of_property_read_bool(np, "pause");
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+ status.asym_pause = of_property_read_bool(np, "asym-pause");
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+ of_node_put(fixed_link_node);
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+ return fixed_phy_register(PHY_POLL, &status, np);
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+ }
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+
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+ /* Old binding */
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+ fixed_link_prop = of_get_property(np, "fixed-link", &len);
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+ if (fixed_link_prop && len == (5 * sizeof(__be32))) {
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+ status.link = 1;
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+ status.duplex = be32_to_cpu(fixed_link_prop[1]);
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+ status.speed = be32_to_cpu(fixed_link_prop[2]);
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+ status.pause = be32_to_cpu(fixed_link_prop[3]);
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+ status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
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+ return fixed_phy_register(PHY_POLL, &status, np);
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+ }
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+
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+ return -ENODEV;
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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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@@ -67,4 +67,19 @@ 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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+extern bool of_phy_is_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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+static inline bool of_phy_is_fixed_link(struct device_node *np)
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+{
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+ return false;
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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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