bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0852-clk-Remove-redundant-clk_core_init_rate_req-call.patch b/target/linux/bcm27xx/patches-5.15/950-0852-clk-Remove-redundant-clk_core_init_rate_req-call.patch
new file mode 100644
index 0000000000..cfc272d194
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0852-clk-Remove-redundant-clk_core_init_rate_req-call.patch
@@ -0,0 +1,34 @@
+From 62bc67ade6e30b4a578f105d8bb18de0ffc45a88 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Sat, 2 Apr 2022 14:06:53 +0200
+Subject: [PATCH] clk: Remove redundant clk_core_init_rate_req() call
+
+Since all the users of clk_core_round_rate_nolock() will now properly
+initialize, there's no need for it to initialize the request itself.
+
+This is even dangerous, as if the clock cannot change its rate by itself
+and has CLK_SET_RATE_PARENT, clk_core_round_rate_nolock() will call
+itself with the parent clock but the client clk_rate_request structure.
+
+We will then reinitialize the child request with the parent context
+(parent, boundaries, etc.), which is an issue if the parent ever changes
+its own parent or parent rate.
+
+Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
+Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/clk/clk.c | 2 --
+ 1 file changed, 2 deletions(-)
+
+--- a/drivers/clk/clk.c
++++ b/drivers/clk/clk.c
+@@ -1430,8 +1430,6 @@ static int clk_core_round_rate_nolock(st
+ 		return 0;
+ 	}
+ 
+-	clk_core_init_rate_req(core, req, req->rate);
+-
+ 	if (clk_core_can_round(core))
+ 		return clk_core_determine_round_nolock(core, req);
+ 	else if (core->flags & CLK_SET_RATE_PARENT)