[PATCH v8 11/11] arm64: dts: ti: k3-am64: Reserve timers used by MCU FW

Judith Mendez
2025-05-02T22:03:40Z

From: Hari Nagalla <hnagalla@ti.com>

AM64x device has 4 R5F cores in the main domain. TI MCU firmware uses
main domain timers as tick timers in these firmwares. Hence keep them
as reserved in the Linux device tree.

Signed-off-by: Hari Nagalla <hnagalla@ti.com>
Signed-off-by: Judith Mendez <jm@ti.com>
Reviewed-by: Andrew Davis <afd@ti.com>
---
arch/arm64/boot/dts/ti/k3-am642-evm.dts | 20 ++++++++++++++++++++
arch/arm64/boot/dts/ti/k3-am642-sk.dts | 20 ++++++++++++++++++++
2 files changed, 40 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am642-evm.dts b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
index f8ec40523254..5623ab354a1d 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
@@ -796,6 +796,26 @@ &mcu_m4fss {
status = "okay";
};

+/* main_timer8 is used by r5f0-0 */
+&main_timer8 {
+ status = "reserved";
+};
+
+/* main_timer9 is used by r5f0-1 */
+&main_timer9 {
+ status = "reserved";
+};
+
+/* main_timer10 is used by r5f1-0 */
+&main_timer10 {
+ status = "reserved";
+};
+
+/* main_timer11 is used by r5f1-1 */
+&main_timer11 {
+ status = "reserved";
+};
+
&serdes_ln_ctrl {
idle-states = <AM64_SERDES0_LANE0_PCIE0>;
};
diff --git a/arch/arm64/boot/dts/ti/k3-am642-sk.dts b/arch/arm64/boot/dts/ti/k3-am642-sk.dts
index 33e421ec18ab..1deaa0be0085 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-sk.dts
@@ -710,6 +710,26 @@ &mcu_m4fss {
status = "okay";
};

+/* main_timer8 is used by r5f0-0 */
+&main_timer8 {
+ status = "reserved";
+};
+
+/* main_timer9 is used by r5f0-1 */
+&main_timer9 {
+ status = "reserved";
+};
+
+/* main_timer10 is used by r5f1-0 */
+&main_timer10 {
+ status = "reserved";
+};
+
+/* main_timer11 is used by r5f1-1 */
+&main_timer11 {
+ status = "reserved";
+};
+
&ecap0 {
status = "okay";
/* PWM is available on Pin 1 of header J3 */
--
2.49.0