From: Grant Likely <grant.lik...@secretlab.ca> Add support for parsing the device tree for PHY devices on an MDIO bus
CC: Andy Fleming <aflem...@freescale.com> CC: linuxppc-dev@ozlabs.org CC: devtree-disc...@ozlabs.org Signed-off-by: Grant Likely <grant.lik...@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 */ _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev