linux-kernel - [PATCH v5 10/10] arm64: dts: ti: k3-am64: Reserve timers used by MCU FW

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Message-ID: <20250210221530.1234009-11-jm@ti.com>
Date: Mon, 10 Feb 2025 16:15:30 -0600
From: Judith Mendez <jm@...com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>
CC: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Andrew Davis
	<afd@...com>,
        Hari Nagalla <hnagalla@...com>, Judith Mendez <jm@...com>
Subject: [PATCH v5 10/10] arm64: dts: ti: k3-am64: Reserve timers used by MCU FW

From: Hari Nagalla <hnagalla@...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@...com>
Signed-off-by: Judith Mendez <jm@...com>
---
Changes since v4:
- Reserve timers for AM64 MCU FW, patch 10/10
---
 arch/arm64/boot/dts/ti/k3-am642-evm.dts | 17 +++++++++++++++++
 arch/arm64/boot/dts/ti/k3-am642-sk.dts  | 17 +++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am642-evm.dts b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
index f8ec40523254b..68bd6b806f8f0 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
@@ -796,6 +796,23 @@ &mcu_m4fss {
 	status = "okay";
 };
 
+/* main_timers 8-11 are used by TI MCU FW */
+&main_timer8 {
+	status = "reserved";
+};
+
+&main_timer9 {
+	status = "reserved";
+};
+
+&main_timer10 {
+	status = "reserved";
+};
+
+&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 33e421ec18abb..07fbdf2400d23 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-sk.dts
@@ -710,6 +710,23 @@ &mcu_m4fss {
 	status = "okay";
 };
 
+/* main_timers 8-11 are used by TI MCU FW */
+&main_timer8 {
+	status = "reserved";
+};
+
+&main_timer9 {
+	status = "reserved";
+};
+
+&main_timer10 {
+	status = "reserved";
+};
+
+&main_timer11 {
+	status = "reserved";
+};
+
 &ecap0 {
 	status = "okay";
 	/* PWM is available on Pin 1 of header J3 */
-- 
2.48.0