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lan78xx: Read LED states from Device Tree

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Add support for DT property "microchip,led-modes", a vector of zero
to four cells (u32s) in the range 0-15, each of which sets the mode
for one of the LEDs. Some possible values are:

    0=link/activity          1=link1000/activity
    2=link100/activity       3=link10/activity
    4=link100/1000/activity  5=link10/1000/activity
    6=link10/100/activity    14=off    15=on

These values are given symbolic constants in a dt-bindings header.

Also use the presence of the DT property to indicate that the
LEDs should be enabled - necessary in the event that no valid OTP
or EEPROM is available.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Phil Elwell
2018-04-19 17:59:39 +01:00
committed by David S. Miller
parent 760db29bdc
commit 1827b06788
5 changed files with 81 additions and 1 deletions
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3
include/linux/microchipphy.h
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@@ -70,4 +70,7 @@
#define LAN88XX_MMD3_CHIP_ID (32877)
#define LAN88XX_MMD3_CHIP_REV (32878)
/* Registers specific to the LAN7800/LAN7850 embedded phy */
#define LAN78XX_PHY_LED_MODE_SELECT (0x1D)
#endif /* _MICROCHIPPHY_H */