bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0023-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch b/target/linux/bcm27xx/patches-5.4/950-0023-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch
new file mode 100644
index 0000000000..b01c267035
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0023-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch
@@ -0,0 +1,38 @@
+From 9eeebf9e7bb7a25a81f72c0e21793614fab49ec4 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Mon, 9 May 2016 17:28:18 -0700
+Subject: [PATCH] clk: bcm2835: Mark GPIO clocks enabled at boot as
+ critical.
+
+These divide off of PLLD_PER and are used for the ethernet and wifi
+PHYs source PLLs.  Neither of them is currently represented by a phy
+device that would grab the clock for us.
+
+This keeps other drivers from killing the networking PHYs when they
+disable their own clocks and trigger PLLD_PER's refcount going to 0.
+
+v2: Skip marking as critical if they aren't on at boot.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/clk/bcm/clk-bcm2835.c | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+--- a/drivers/clk/bcm/clk-bcm2835.c
++++ b/drivers/clk/bcm/clk-bcm2835.c
+@@ -1455,6 +1455,15 @@ static struct clk_hw *bcm2835_register_c
+ 	init.flags = data->flags | CLK_IGNORE_UNUSED;
+ 
+ 	/*
++	 * Some GPIO clocks for ethernet/wifi PLLs are marked as
++	 * critical (since some platforms use them), but if the
++	 * firmware didn't have them turned on then they clearly
++	 * aren't actually critical.
++	 */
++	if ((cprman_read(cprman, data->ctl_reg) & CM_ENABLE) == 0)
++		init.flags &= ~CLK_IS_CRITICAL;
++
++	/*
+ 	 * Pass the CLK_SET_RATE_PARENT flag if we are allowed to propagate
+ 	 * rate changes on at least of the parents.
+ 	 */