[PATCH] arm: dts: k3-am65: Fix up MCU R5FSS cluster mode back to Split-mode

[Suman Anna]

The default U-Boot environment variables and design are all set up to
have the MCU R5FSS cluster to be in Split-mode. This is the setting
in v2021.01 U-Boot and the dt nodes are synched with the kernel binding
property names in commit 468ec2f3ef8f ("remoteproc: k3_r5: Sync to
upstreamed kernel DT property names") merged in v2021.04-rc2.

The mode for the cluster got switched back to LockStep mode by mistake
in commit e49787634312 ("arm: dts: k3-am65: Sync Linux v5.11-rc6 dts
into U-Boot") also in v2021.04-rc2. This throws the following warning
messages when early-booting the cores using default env variables,

  k3_r5f_rproc r5f at 41400000: Invalid op: Trying to start secondary core 2 in lockstep mode
  Load Remote Processor 1 with data at addr=0x82000000 65268 bytes: Failed!

Fix this by switching back the cluster to the expected Split-mode.
Make this mode change in the u-boot specific dtsi file to avoid such
sync overrides in the future until the kernel dts is also switched to
Split-mode by default.

Fixes: e49787634312 ("arm: dts: k3-am65: Sync Linux v5.11-rc6 dts into U-Boot")
Signed-off-by: Suman Anna <s-anna at ti.com>
---
 arch/arm/dts/k3-am654-base-board-u-boot.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/k3-am654-base-board-u-boot.dtsi b/arch/arm/dts/k3-am654-base-board-u-boot.dtsi
index df850a2edb6e..0c1305df7e45 100644
--- a/arch/arm/dts/k3-am654-base-board-u-boot.dtsi
+++ b/arch/arm/dts/k3-am654-base-board-u-boot.dtsi
@@ -76,3 +76,7 @@
 &tx_pru2_1 {
 	remoteproc-name = "tx_pru2_1";
 };
+
+&mcu_r5fss0 {
+	ti,cluster-mode = <0>;
+};
-- 
2.32.0