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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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25
drivers/net/phy/microchip.c
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@@ -20,6 +20,8 @@
#include <linux/ethtool.h>
#include <linux/phy.h>
#include <linux/microchipphy.h>
#include <linux/of.h>
#include <dt-bindings/net/microchip-lan78xx.h>
#define DRIVER_AUTHOR "WOOJUNG HUH <woojung.huh@microchip.com>"
#define DRIVER_DESC "Microchip LAN88XX PHY driver"
@@ -70,6 +72,8 @@ static int lan88xx_probe(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
struct lan88xx_priv *priv;
u32 led_modes[4];
int len;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -77,6 +81,27 @@ static int lan88xx_probe(struct phy_device *phydev)
priv->wolopts = 0;
len = of_property_read_variable_u32_array(dev->of_node,
"microchip,led-modes",
led_modes,
0,
ARRAY_SIZE(led_modes));
if (len >= 0) {
u32 reg = 0;
int i;
for (i = 0; i < len; i++) {
if (led_modes[i] > 15)
return -EINVAL;
reg |= led_modes[i] << (i * 4);
}
for (; i < ARRAY_SIZE(led_modes); i++)
reg |= LAN78XX_FORCE_LED_OFF << (i * 4);
(void)phy_write(phydev, LAN78XX_PHY_LED_MODE_SELECT, reg);
} else if (len == -EOVERFLOW) {
return -EINVAL;
}
/* these values can be used to identify internal PHY */
priv->chip_id = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_ID);
priv->chip_rev = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_REV);