Commit 0a8b275d authored by David S. Miller's avatar David S. Miller

Merge branch 'lan78xx-Read-configuration-from-Device-Tree'

Phil Elwell says:

====================
lan78xx: Read configuration from Device Tree

The Microchip LAN78XX family of devices are Ethernet controllers with
a USB interface. Despite being discoverable devices it can be useful to
be able to configure them from Device Tree, particularly in low-cost
applications without an EEPROM or programmed OTP.

This patch set adds support for reading the MAC address and LED modes from
Device Tree.

v4:
- Rename nodes in bindings doc.

v3:
- Move LED setting into PHY driver.

v2:
- Use eth_platform_get_mac_address.
- Support up to 4 LEDs, and move LED mode constants into dt-bindings header.
- Improve bindings document.
- Remove EEE support.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents a83762d9 01d26589
Microchip LAN78xx Gigabit Ethernet controller
The LAN78XX devices are usually configured by programming their OTP or with
an external EEPROM, but some platforms (e.g. Raspberry Pi 3 B+) have neither.
The Device Tree properties, if present, override the OTP and EEPROM.
Required properties:
- compatible: Should be one of "usb424,7800", "usb424,7801" or "usb424,7850".
Optional properties:
- local-mac-address: see ethernet.txt
- mac-address: see ethernet.txt
Optional properties of the embedded PHY:
- microchip,led-modes: a 0..4 element vector, with each element configuring
the operating mode of an LED. Omitted LEDs are turned off. Allowed values
are defined in "include/dt-bindings/net/microchip-lan78xx.h".
Example:
/* Based on the configuration for a Raspberry Pi 3 B+ */
&usb {
usb-port@1 {
compatible = "usb424,2514";
reg = <1>;
#address-cells = <1>;
#size-cells = <0>;
usb-port@1 {
compatible = "usb424,2514";
reg = <1>;
#address-cells = <1>;
#size-cells = <0>;
ethernet: ethernet@1 {
compatible = "usb424,7800";
reg = <1>;
local-mac-address = [ 00 11 22 33 44 55 ];
mdio {
#address-cells = <0x1>;
#size-cells = <0x0>;
eth_phy: ethernet-phy@1 {
reg = <1>;
microchip,led-modes = <
LAN78XX_LINK_1000_ACTIVITY
LAN78XX_LINK_10_100_ACTIVITY
>;
};
};
};
};
};
};
......@@ -14571,7 +14571,9 @@ M: Woojung Huh <woojung.huh@microchip.com>
M: Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>
L: netdev@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/net/microchip,lan78xx.txt
F: drivers/net/usb/lan78xx.*
F: include/dt-bindings/net/microchip-lan78xx.h
USB MASS STORAGE DRIVER
M: Alan Stern <stern@rowland.harvard.edu>
......
......@@ -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);
......
......@@ -37,6 +37,8 @@
#include <linux/irqchip/chained_irq.h>
#include <linux/microchipphy.h>
#include <linux/phy.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include "lan78xx.h"
#define DRIVER_AUTHOR "WOOJUNG HUH <woojung.huh@microchip.com>"
......@@ -1652,12 +1654,15 @@ static void lan78xx_init_mac_address(struct lan78xx_net *dev)
addr[5] = (addr_hi >> 8) & 0xFF;
if (!is_valid_ether_addr(addr)) {
/* reading mac address from EEPROM or OTP */
if ((lan78xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
addr) == 0) ||
(lan78xx_read_otp(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
addr) == 0)) {
if (is_valid_ether_addr(addr)) {
if (!eth_platform_get_mac_address(&dev->udev->dev, addr)) {
/* valid address present in Device Tree */
netif_dbg(dev, ifup, dev->net,
"MAC address read from Device Tree");
} else if (((lan78xx_read_eeprom(dev, EEPROM_MAC_OFFSET,
ETH_ALEN, addr) == 0) ||
(lan78xx_read_otp(dev, EEPROM_MAC_OFFSET,
ETH_ALEN, addr) == 0)) &&
is_valid_ether_addr(addr)) {
/* eeprom values are valid so use them */
netif_dbg(dev, ifup, dev->net,
"MAC address read from EEPROM");
......@@ -1674,12 +1679,6 @@ static void lan78xx_init_mac_address(struct lan78xx_net *dev)
ret = lan78xx_write_reg(dev, RX_ADDRL, addr_lo);
ret = lan78xx_write_reg(dev, RX_ADDRH, addr_hi);
} else {
/* generate random MAC */
random_ether_addr(addr);
netif_dbg(dev, ifup, dev->net,
"MAC address set to random addr");
}
}
ret = lan78xx_write_reg(dev, MAF_LO(0), addr_lo);
......@@ -1762,6 +1761,7 @@ static int lan78xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
static int lan78xx_mdio_init(struct lan78xx_net *dev)
{
struct device_node *node;
int ret;
dev->mdiobus = mdiobus_alloc();
......@@ -1790,7 +1790,13 @@ static int lan78xx_mdio_init(struct lan78xx_net *dev)
break;
}
node = of_get_child_by_name(dev->udev->dev.of_node, "mdio");
if (node) {
ret = of_mdiobus_register(dev->mdiobus, node);
of_node_put(node);
} else {
ret = mdiobus_register(dev->mdiobus);
}
if (ret) {
netdev_err(dev->net, "can't register MDIO bus\n");
goto exit1;
......@@ -2079,6 +2085,28 @@ static int lan78xx_phy_init(struct lan78xx_net *dev)
mii_adv = (u32)mii_advertise_flowctrl(dev->fc_request_control);
phydev->advertising |= mii_adv_to_ethtool_adv_t(mii_adv);
if (phydev->mdio.dev.of_node) {
u32 reg;
int len;
len = of_property_count_elems_of_size(phydev->mdio.dev.of_node,
"microchip,led-modes",
sizeof(u32));
if (len >= 0) {
/* Ensure the appropriate LEDs are enabled */
lan78xx_read_reg(dev, HW_CFG, &reg);
reg &= ~(HW_CFG_LED0_EN_ |
HW_CFG_LED1_EN_ |
HW_CFG_LED2_EN_ |
HW_CFG_LED3_EN_);
reg |= (len > 0) * HW_CFG_LED0_EN_ |
(len > 1) * HW_CFG_LED1_EN_ |
(len > 2) * HW_CFG_LED2_EN_ |
(len > 3) * HW_CFG_LED3_EN_;
lan78xx_write_reg(dev, HW_CFG, reg);
}
}
genphy_config_aneg(phydev);
dev->fc_autoneg = phydev->autoneg;
......
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _DT_BINDINGS_MICROCHIP_LAN78XX_H
#define _DT_BINDINGS_MICROCHIP_LAN78XX_H
/* LED modes for LAN7800/LAN7850 embedded PHY */
#define LAN78XX_LINK_ACTIVITY 0
#define LAN78XX_LINK_1000_ACTIVITY 1
#define LAN78XX_LINK_100_ACTIVITY 2
#define LAN78XX_LINK_10_ACTIVITY 3
#define LAN78XX_LINK_100_1000_ACTIVITY 4
#define LAN78XX_LINK_10_1000_ACTIVITY 5
#define LAN78XX_LINK_10_100_ACTIVITY 6
#define LAN78XX_DUPLEX_COLLISION 8
#define LAN78XX_COLLISION 9
#define LAN78XX_ACTIVITY 10
#define LAN78XX_AUTONEG_FAULT 12
#define LAN78XX_FORCE_LED_OFF 14
#define LAN78XX_FORCE_LED_ON 15
#endif
......@@ -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 */
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