[PATCH 3/3] ARM: dts: broadcom: Use CFE CPU bring-up on the XG6846B

[Linus Walleij]

The XG6846B boots through CFE, which parks CPU1 in a holding pen and does
not provide PSCI. Chain-loading mainline U-Boot and starting Linux with
"go" does not install a PSCI implementation either. The working PSCI
interface in newer GenXOS firmware belongs to a different boot stack.

Disable the inherited PSCI node on this board so Linux does not issue
SMCs to an interface that is absent. Remove the CPU PSCI enable-method
properties and use the board-specific CFE SMP operations. Keep both CPU
nodes enabled and leave the SoC's PSCI defaults available to other boards.

Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw at kernel.org>
---
 arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts b/arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts
index 6cb221dca0ac..bb467320e1f0 100644
--- a/arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts
+++ b/arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts
@@ -56,6 +56,19 @@ button-restart {
 	};
 };
 
+/* CFE parks CPU1 in its holding pen and does not provide PSCI. */
+&{/psci} {
+	status = "disabled";
+};
+
+&CA7_0 {
+	/delete-property/ enable-method;
+};
+
+&CA7_1 {
+	/delete-property/ enable-method;
+};
+
 &gpio0 {
 	status = "okay";
 };

-- 
2.56.0