[PATCH] arm64: dts: hi3660: Add property for fixing CPUIdle

[James Clark]

On 10/03/2025 9:37 am, Leo Yan wrote:
> During CPU low power modes, ETM components will lose their context.  Add
> the "arm,coresight-loses-context-with-cpu" property to ETM nodes to save
> and restore ETM context for CPU idle states.
> 
> Signed-off-by: Leo Yan <leo.yan at arm.com>
> ---
>   arch/arm64/boot/dts/hisilicon/hi3660-coresight.dtsi | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/hisilicon/hi3660-coresight.dtsi b/arch/arm64/boot/dts/hisilicon/hi3660-coresight.dtsi
> index 79a55a0fa2f1..4c6a075908d1 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi3660-coresight.dtsi
> +++ b/arch/arm64/boot/dts/hisilicon/hi3660-coresight.dtsi
> @@ -17,6 +17,7 @@ etm at ecc40000 {
>   			clocks = <&crg_ctrl HI3660_PCLK>;
>   			clock-names = "apb_pclk";
>   			cpu = <&cpu0>;
> +			arm,coresight-loses-context-with-cpu;
>   
>   			out-ports {
>   				port {
> @@ -34,6 +35,7 @@ etm at ecd40000 {
>   			clocks = <&crg_ctrl HI3660_PCLK>;
>   			clock-names = "apb_pclk";
>   			cpu = <&cpu1>;
> +			arm,coresight-loses-context-with-cpu;
>   
>   			out-ports {
>   				port {
> @@ -51,6 +53,7 @@ etm at ece40000 {
>   			clocks = <&crg_ctrl HI3660_PCLK>;
>   			clock-names = "apb_pclk";
>   			cpu = <&cpu2>;
> +			arm,coresight-loses-context-with-cpu;
>   
>   			out-ports {
>   				port {
> @@ -68,6 +71,7 @@ etm at ecf40000 {
>   			clocks = <&crg_ctrl HI3660_PCLK>;
>   			clock-names = "apb_pclk";
>   			cpu = <&cpu3>;
> +			arm,coresight-loses-context-with-cpu;
>   
>   			out-ports {
>   				port {
> @@ -160,6 +164,7 @@ etm at ed440000 {
>   			clocks = <&crg_ctrl HI3660_PCLK>;
>   			clock-names = "apb_pclk";
>   			cpu = <&cpu4>;
> +			arm,coresight-loses-context-with-cpu;
>   
>   			out-ports {
>   				port {
> @@ -177,6 +182,7 @@ etm at ed540000 {
>   			clocks = <&crg_ctrl HI3660_PCLK>;
>   			clock-names = "apb_pclk";
>   			cpu = <&cpu5>;
> +			arm,coresight-loses-context-with-cpu;
>   
>   			out-ports {
>   				port {
> @@ -194,6 +200,7 @@ etm at ed640000 {
>   			clocks = <&crg_ctrl HI3660_PCLK>;
>   			clock-names = "apb_pclk";
>   			cpu = <&cpu6>;
> +			arm,coresight-loses-context-with-cpu;
>   
>   			out-ports {
>   				port {
> @@ -211,6 +218,7 @@ etm at ed740000 {
>   			clocks = <&crg_ctrl HI3660_PCLK>;
>   			clock-names = "apb_pclk";
>   			cpu = <&cpu7>;
> +			arm,coresight-loses-context-with-cpu;
>   
>   			out-ports {
>   				port {

Reviewed-by: James Clark <james.clark at linaro.org>