From 6ed88d188a8240ba44da6578eab7d17e036d0e61 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 17 Oct 2017 15:04:29 +0100
Subject: [PATCH] lan78xx: Enable LEDs if no valid EEPROM or OTP

For applications of the LAN78xx that don't have valid programmed
EEPROMs or OTPs, enabling both LEDs by default seems reasonable.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/net/usb/lan78xx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index a21039852f8d..cd20ce4ed87d 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2414,6 +2414,12 @@ static int lan78xx_reset(struct lan78xx_net *dev)
 
 	ret = lan78xx_read_reg(dev, HW_CFG, &buf);
 	buf |= HW_CFG_MEF_;
+
+	/* If no valid EEPROM and no valid OTP, enable the LEDs by default */
+	if (lan78xx_read_eeprom(dev, 0, 0, NULL) &&
+	    lan78xx_read_otp(dev, 0, 0, NULL))
+	    buf |= HW_CFG_LED0_EN_ | HW_CFG_LED1_EN_;
+
 	ret = lan78xx_write_reg(dev, HW_CFG, buf);
 
 	ret = lan78xx_read_reg(dev, USB_CFG0, &buf);
From f8a798bb45ae15cbec980c8e921eb377fd1a3df6 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 28 Nov 2017 12:02:37 +0000
Subject: [PATCH] lan78xx: Correctly indicate invalid OTP

lan78xx_read_otp tries to return -EINVAL in the event of invalid OTP
content, but the value gets overwritten before it is returned and the
read goes ahead anyway. Make the read conditional as it should be
and preserve the error code.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/net/usb/lan78xx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index cd20ce4ed87d..b270935f3f8d 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -929,7 +929,8 @@ static int lan78xx_read_otp(struct lan78xx_net *dev, u32 offset,
 			offset += 0x100;
 		else
 			ret = -EINVAL;
-		ret = lan78xx_read_raw_otp(dev, offset, length, data);
+		if (!ret)
+			ret = lan78xx_read_raw_otp(dev, offset, length, data);
 	}
 
 	return ret;
From 4a4710f3847cd087e150f83382dffd92e09d9914 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Sat, 17 Mar 2018 00:10:02 +0100
Subject: [PATCH] lan78xx: Read MAC address from DT if present

There is a standard mechanism for locating and using a MAC address from
the Device Tree. Use this facility in the lan78xx driver to support
applications without programmed EEPROM or OTP.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/net/usb/lan78xx.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index 60a604cc7647..a21039852f8d 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -36,6 +36,7 @@
 #include <linux/irq.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/microchipphy.h>
+#include <linux/of_net.h>
 #include <linux/phy.h>
 #include "lan78xx.h"
 
@@ -1639,6 +1640,14 @@ static void lan78xx_init_mac_address(struct lan78xx_net *dev)
 	u32 addr_lo, addr_hi;
 	int ret;
 	u8 addr[6];
+	const u8 *mac_addr;
+
+	/* maybe the boot loader passed the MAC address in devicetree */
+	mac_addr = of_get_mac_address(dev->udev->dev.of_node);
+	if (mac_addr) {
+		ether_addr_copy(addr, mac_addr);
+		goto set_mac_addr;
+	}
 
 	ret = lan78xx_read_reg(dev, RX_ADDRL, &addr_lo);
 	ret = lan78xx_read_reg(dev, RX_ADDRH, &addr_hi);
@@ -1667,6 +1676,7 @@ static void lan78xx_init_mac_address(struct lan78xx_net *dev)
 					  "MAC address set to random addr");
 			}
 
+set_mac_addr:
 			addr_lo = addr[0] | (addr[1] << 8) |
 				  (addr[2] << 16) | (addr[3] << 24);
 			addr_hi = addr[4] | (addr[5] << 8);