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drivers/net/phy: add fixed-phy / fixed-link support

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This patch adds support for having a "fixed-link" to some other MAC
(like some embedded switch-device).

For this purpose we introduce a new phy-driver, called "Fixed PHY".

Fixed PHY works only with CONFIG_DM_ETH enabled, since the fixed-link is
described with a subnode below ethernet interface.

Most ethernet drivers (unfortunately not all are following same scheme
for searching/attaching phys) are calling "phy_connect(...)" for getting
a phy-device.
At this point we link in, we search here for a subnode called "fixed-
link", once found we start phy_device_create(...) with the special phy-
id PHY_FIXED_ID (0xa5a55a5a).

During init the "Fixed PHY" driver has registered with this id and now
gets probed, during probe we get all the details about fixed-link out of
dts, later on the phy reports this values.

Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>

Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
This commit is contained in:
Hannes Schmelzer 2017-03-23 15:11:43 +01:00 • committed by Joe Hershberger
parent f8e57c650d
commit db40c1aa1c
6 changed files with 146 additions and 3 deletions
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3
include/phy.h
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@ -15,6 +15,8 @@
#include <linux/ethtool.h>
#include <linux/mdio.h>
#define PHY_FIXED_ID 0xa5a55a5a
#define PHY_MAX_ADDR 32
#define PHY_FLAG_BROKEN_RESET (1 << 0) /* soft reset not supported */
@ -267,6 +269,7 @@ int phy_ti_init(void);
int phy_vitesse_init(void);
int phy_xilinx_init(void);
int phy_mscc_init(void);
int phy_fixed_init(void);
int board_phy_config(struct phy_device *phydev);
int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id);