xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

net: phy: add I2C mdio bus

Browse Source 
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.

Since PHYs appear at I2C bus address 0x40..0x5f, and 0x50/0x51 are
reserved for SFP EEPROMs/diagnostics, we must not allow the MDIO bus
to access these I2C addresses.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King
2017-07-25 15:03:08 +01:00
committed by David S. Miller
parent 5e5758d9d8
commit 453d00defb
4 changed files with 139 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/net/phy/mdio-i2c.h Normal file
View File

@@ -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