+++ /dev/null
-From 7f36ac946bfbd4090b8b94be3661b41ac73e21f4 Mon Sep 17 00:00:00 2001
-From: Russell King <rmk+kernel@arm.linux.org.uk>
-Date: Fri, 25 Sep 2015 17:43:52 +0100
-Subject: [PATCH 717/744] phy: add I2C mdio bus
-
-Add an I2C MDIO bus bridge library, to allow phylib to access PHYs which
-are connected to an I2C bus instead of the more conventional MDIO bus.
-Such PHYs can be found in SFP adapters and SFF modules.
-
-Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
----
- drivers/net/phy/Kconfig | 10 ++++++
- drivers/net/phy/Makefile | 1 +
- drivers/net/phy/mdio-i2c.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++
- drivers/net/phy/mdio-i2c.h | 19 ++++++++++
- 4 files changed, 120 insertions(+)
- create mode 100644 drivers/net/phy/mdio-i2c.c
- create mode 100644 drivers/net/phy/mdio-i2c.h
-
---- a/drivers/net/phy/Kconfig
-+++ b/drivers/net/phy/Kconfig
-@@ -233,6 +233,16 @@ config MDIO_GPIO
- To compile this driver as a module, choose M here: the module
- will be called mdio-gpio.
-
-+config MDIO_I2C
-+ tristate
-+ depends on I2C
-+ help
-+ Support I2C based PHYs. This provides a MDIO bus bridged
-+ to I2C to allow PHYs connected in I2C mode to be accessed
-+ using the existing infrastructure.
-+
-+ This is library mode.
-+
- config MDIO_OCTEON
- tristate "Support for MDIO buses on Octeon and ThunderX SOCs"
- depends on 64BIT
---- a/drivers/net/phy/Makefile
-+++ b/drivers/net/phy/Makefile
-@@ -41,6 +41,7 @@ obj-$(CONFIG_SWCONFIG_B53) += b53/
- obj-$(CONFIG_FIXED_PHY) += fixed_phy.o
- obj-$(CONFIG_MDIO_BITBANG) += mdio-bitbang.o
- obj-$(CONFIG_MDIO_GPIO) += mdio-gpio.o
-+obj-$(CONFIG_MDIO_I2C) += mdio-i2c.o
- obj-$(CONFIG_NATIONAL_PHY) += national.o
- obj-$(CONFIG_DP83640_PHY) += dp83640.o
- obj-$(CONFIG_DP83848_PHY) += dp83848.o
---- /dev/null
-+++ b/drivers/net/phy/mdio-i2c.c
-@@ -0,0 +1,90 @@
-+/*
-+ * MDIO I2C bridge
-+ *
-+ * Copyright (C) 2015 Russell King
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 as
-+ * published by the Free Software Foundation.
-+ */
-+#include <linux/i2c.h>
-+#include <linux/phy.h>
-+
-+#include "mdio-i2c.h"
-+
-+static int i2c_mii_read(struct mii_bus *bus, int phy_id, int reg)
-+{
-+ struct i2c_adapter *i2c = bus->priv;
-+ struct i2c_msg msgs[2];
-+ u8 data[2], dev_addr = reg;
-+ int bus_addr, ret;
-+
-+ bus_addr = 0x40 + phy_id;
-+ if (bus_addr == 0x50 || bus_addr == 0x51)
-+ return 0xffff;
-+
-+ msgs[0].addr = bus_addr;
-+ msgs[0].flags = 0;
-+ msgs[0].len = 1;
-+ msgs[0].buf = &dev_addr;
-+ msgs[1].addr = bus_addr;
-+ msgs[1].flags = I2C_M_RD;
-+ msgs[1].len = sizeof(data);
-+ msgs[1].buf = data;
-+
-+ ret = i2c_transfer(i2c, msgs, ARRAY_SIZE(msgs));
-+ if (ret != ARRAY_SIZE(msgs))
-+ return 0xffff;
-+
-+ return data[0] << 8 | data[1];
-+}
-+
-+static int i2c_mii_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
-+{
-+ struct i2c_adapter *i2c = bus->priv;
-+ struct i2c_msg msg;
-+ int bus_addr, ret;
-+ u8 data[3];
-+
-+ bus_addr = 0x40 + phy_id;
-+ if (bus_addr == 0x50 || bus_addr == 0x51)
-+ return 0;
-+
-+ data[0] = reg;
-+ data[1] = val >> 8;
-+ data[2] = val;
-+
-+ msg.addr = bus_addr;
-+ msg.flags = 0;
-+ msg.len = 3;
-+ msg.buf = data;
-+
-+ ret = i2c_transfer(i2c, &msg, 1);
-+
-+ return ret < 0 ? ret : 0;
-+}
-+
-+struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c)
-+{
-+ struct mii_bus *mii;
-+
-+ if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
-+ return ERR_PTR(-EINVAL);
-+
-+ mii = mdiobus_alloc();
-+ if (!mii)
-+ return ERR_PTR(-ENOMEM);
-+
-+ snprintf(mii->id, MII_BUS_ID_SIZE, "i2c:%s", dev_name(parent));
-+ mii->parent = parent;
-+ mii->read = i2c_mii_read;
-+ mii->write = i2c_mii_write;
-+ mii->priv = i2c;
-+
-+ return mii;
-+}
-+EXPORT_SYMBOL_GPL(mdio_i2c_alloc);
-+
-+MODULE_AUTHOR("Russell King");
-+MODULE_DESCRIPTION("MDIO I2C bridge library");
-+MODULE_LICENSE("GPL v2");
---- /dev/null
-+++ b/drivers/net/phy/mdio-i2c.h
-@@ -0,0 +1,19 @@
-+/*
-+ * MDIO I2C bridge
-+ *
-+ * Copyright (C) 2015 Russell King
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 as
-+ * published by the Free Software Foundation.
-+ */
-+#ifndef MDIO_I2C_H
-+#define MDIO_I2C_H
-+
-+struct device;
-+struct i2c_adapter;
-+struct mii_bus;
-+
-+struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c);
-+
-+#endif
projects / openwrt / staging / lynxis / omap.git / blobdiff