brcm63xx: add linux 4.19 support

Boot tested on Comtrend AR-5387un:
https://gist.github.com/Noltari/57e5030455da8dc38e61f8c3a5922254

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[jonas.gorski: make 4.19 an optional testing version; add gcc 8.3 fix]
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-4.19/100-MIPS-BCM63XX-add-USB-host-clock-enable-delay.patch b/target/linux/brcm63xx/patches-4.19/100-MIPS-BCM63XX-add-USB-host-clock-enable-delay.patch
new file mode 100644
index 0000000000..3974b9bd30
--- /dev/null
+++ b/target/linux/brcm63xx/patches-4.19/100-MIPS-BCM63XX-add-USB-host-clock-enable-delay.patch
@@ -0,0 +1,28 @@
+From 80a2f983e9f44dbc3e01ae31c62d877846a7f791 Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <florian@openwrt.org>
+Date: Mon, 28 Jan 2013 20:06:19 +0100
+Subject: [PATCH 01/11] MIPS: BCM63XX: add USB host clock enable delay
+
+Knowledge of the clock setup delay should remain at the clock level (so
+it can be clock specific and CPU specific). Add the 100 milliseconds
+required clock delay for the USB host clock when it gets enabled.
+
+Signed-off-by: Florian Fainelli <florian@openwrt.org>
+---
+ arch/mips/bcm63xx/clk.c |    5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/arch/mips/bcm63xx/clk.c
++++ b/arch/mips/bcm63xx/clk.c
+@@ -214,6 +214,11 @@ static void usbh_set(struct clk *clk, in
+ 		bcm_hwclock_set(CKCTL_6362_USBH_EN, enable);
+ 	else if (BCMCPU_IS_6368())
+ 		bcm_hwclock_set(CKCTL_6368_USBH_EN, enable);
++	else
++		return;
++
++	if (enable)
++		msleep(100);
+ }
+ 
+ static struct clk clk_usbh = {