Re: [PATCH v7 11/11] arm64: dts: ti: k3-am64: Reserve timers used by MCU FW

Andrew Davis
2025-04-28T16:29:48Z

On 4/15/25 10:31 AM, Judith Mendez wrote:
> 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 f8ec40523254b..5623ab354a1d5 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 33e421ec18abb..1deaa0be0085c 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 */