[PATCH 4/5] openfirmware: Add OF phylib support code

Grant Likely
2009-03-10T15:23:46Z

Add support for parsing the device tree for PHY devices on an MDIO bus

CC: Andy Fleming <afleming@freescale.com>
CC: linuxppc-dev@ozlabs.org
CC: devtree-discuss@ozlabs.org

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---

drivers/of/Kconfig | 6 ++++
drivers/of/Makefile | 1 +
drivers/of/of_mdio.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/of_mdio.h | 20 +++++++++++++
4 files changed, 97 insertions(+), 0 deletions(-)
create mode 100644 drivers/of/of_mdio.c
create mode 100644 include/linux/of_mdio.h

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index f821dbc..6fe043b 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -19,3 +19,9 @@ config OF_SPI
depends on OF && PPC_OF && SPI
help
OpenFirmware SPI accessors
+
+config OF_MDIO
+ def_tristate PHYLIB
+ depends on OF && PHYLIB
+ help
+ OpenFirmware MDIO bus (Ethernet PHY) accessors
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index 4c3c6f8..bdfb5f5 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_OF_DEVICE) += device.o platform.o
obj-$(CONFIG_OF_GPIO) += gpio.o
obj-$(CONFIG_OF_I2C) += of_i2c.o
obj-$(CONFIG_OF_SPI) += of_spi.o
+obj-$(CONFIG_OF_MDIO) += of_mdio.o
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
new file mode 100644
index 0000000..6a7d4b2
--- /dev/null
+++ b/drivers/of/of_mdio.c
@@ -0,0 +1,70 @@
+/*
+ * OF helpers for the MDIO (Ethernet PHY) API
+ *
+ * Copyright (c) 2009 Secret Lab Technologies, Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This file provides helper functions for extracting PHY device information
+ * out of the OpenFirmware device tree and using it to populate an mii_bus.
+ */
+
+#include <linux/phy.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/module.h>
+
+void of_register_phy_devices(struct mii_bus *mdio, struct device_node *np)
+{
+ struct phy_device *phy;
+ struct device_node *child;
+ int rc;
+
+ for_each_child_of_node(np, child) {
+ const u32 *addr;
+ int len;
+
+ addr = of_get_property(child, "reg", &len);
+ if (!addr || len < sizeof(*addr) || *addr >= 32 || *addr < 0) {
+ dev_err(&mdio->dev, "%s has invalid PHY address\n",
+ child->full_name);
+ continue;
+ }
+
+ if (mdio->irq) {
+ mdio->irq[*addr] = irq_of_parse_and_map(child, 0);
+ if (!mdio->irq[*addr])
+ mdio->irq[*addr] = PHY_POLL;
+ }
+
+ phy = get_phy_device(mdio, *addr);
+ if (!phy) {
+ dev_err(&mdio->dev, "error probing PHY at address %i\n",
+ *addr);
+ continue;
+ }
+ phy_scan_fixups(phy);
+
+ /* Associate the OF node with the device structure so it
+ * can be looked up later */
+ of_node_get(child);
+ dev_archdata_set_node(&phy->dev.archdata, child);
+
+ /* All data is now stored in the phy struct; register it */
+ rc = phy_device_register(phy);
+ if (rc) {
+ phy_device_free(phy);
+ of_node_put(child);
+ continue;
+ }
+
+ dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
+ child->name, *addr);
+ }
+}
+EXPORT_SYMBOL(of_register_phy_devices);
+
+MODULE_LICENSE("GPL");
diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
new file mode 100644
index 0000000..9ea9745
--- /dev/null
+++ b/include/linux/of_mdio.h
@@ -0,0 +1,20 @@
+/*
+ * OF helpers for the MDIO (Ethernet PHY) API
+ *
+ * Copyright (c) 2009 Secret Lab Technologies, Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __LINUX_OF_MDIO_H
+#define __LINUX_OF_MDIO_H
+
+#include <linux/phy.h>
+#include <linux/of.h>
+
+void of_register_phy_devices(struct mii_bus *mdio, struct device_node *np);
+
+#endif /* __LINUX_OF_MDIO_H */