[PATCH] arm64: dts: ti: k3-am62l: support cpufreq

[PATCH] arm64: dts: ti: k3-am62l: support cpufreq

[Dhruva Gole]

Enable CPUFreq support for AM62L SoC by adding the relevant OPP efuse table
syscon to k3-am62l-wakeup.dtsi for speed grade detection.

Add the operating-points-v2 table with CPU frequency steps from 200MHz to
1.25GHz to k3-am62l3.dtsi

Configure CPU clocks to reference the SCMI clock controller for frequency
scaling

This enables proper CPU frequency scaling capabilities for the AM62L SoC
using the ARM SCMI protocol to interact with the power management firmware.

Signed-off-by: Dhruva Gole <d-gole@ti.com>
---
The driver changes were merged previously [0], and so the DT patch
is now being posted seperately. 

Logs:

root@am62lxx-evm:~# cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_frequencies
200000 400000 600000 800000 1000000 1250000
200000 400000 600000 800000 1000000 1250000

Changelog:
- fix the bit fiels in the OPPs as per Kendall's suggestion
- Fix the scmi_clk ID of the second A53 core

[1] https://lore.kernel.org/all/20260120-am62l-cpufreq-v3-0-8c69b80168a3@ti.com/
---
 arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi |  5 +++
 arch/arm64/boot/dts/ti/k3-am62l3.dtsi       | 47 +++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi
index 61bfcdcfc66ea8d802a36ed43cd01fbbf3decc70..a42ccd0d2fcc4d204cae81508f839c44ce83f558 100644
--- a/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi
@@ -127,6 +127,11 @@ chipid: chipid@14 {
 			bootph-all;
 		};
 
+		opp_efuse_table: syscon@18 {
+			compatible = "ti,am62-opp-efuse-table", "syscon";
+			reg = <0x18 0x4>;
+		};
+
 		cpsw_mac_syscon: ethernet-mac-syscon@2000 {
 			compatible = "ti,am62p-cpsw-mac-efuse", "syscon";
 			reg = <0x2000 0x8>;
diff --git a/arch/arm64/boot/dts/ti/k3-am62l3.dtsi b/arch/arm64/boot/dts/ti/k3-am62l3.dtsi
index da220b85151227c63f59b2b8ec48ae2ebb37e7bf..26d3040ff53259daba21b39a55bb8a2ed65d4e8f 100644
--- a/arch/arm64/boot/dts/ti/k3-am62l3.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62l3.dtsi
@@ -39,6 +39,8 @@ cpu0: cpu@0 {
 			d-cache-line-size = <64>;
 			d-cache-sets = <128>;
 			next-level-cache = <&l2_0>;
+			operating-points-v2 = <&a53_opp_table>;
+			clocks = <&scmi_clk 356>;
 		};
 
 		cpu1: cpu@1 {
@@ -53,6 +55,8 @@ cpu1: cpu@1 {
 			d-cache-line-size = <64>;
 			d-cache-sets = <128>;
 			next-level-cache = <&l2_0>;
+			operating-points-v2 = <&a53_opp_table>;
+			clocks = <&scmi_clk 357>;
 		};
 	};
 
@@ -64,4 +68,47 @@ l2_0: l2-cache0 {
 		cache-line-size = <64>;
 		cache-sets = <256>;
 	};
+
+	a53_opp_table: opp-table {
+		compatible = "operating-points-v2-ti-cpu";
+		opp-shared;
+		syscon = <&opp_efuse_table>;
+
+		opp-200000000 {
+			opp-hz = /bits/ 64 <200000000>;
+			opp-supported-hw = <0x01 0x0003>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-400000000 {
+			opp-hz = /bits/ 64 <400000000>;
+			opp-supported-hw = <0x01 0x0003>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-600000000 {
+			opp-hz = /bits/ 64 <600000000>;
+			opp-supported-hw = <0x01 0x0003>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-800000000 {
+			opp-hz = /bits/ 64 <800000000>;
+			opp-supported-hw = <0x01 0x0003>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-1000000000 {
+			opp-hz = /bits/ 64 <1000000000>;
+			opp-supported-hw = <0x01 0x0003>;
+			clock-latency-ns = <6000000>;
+		};
+
+		opp-1250000000 {
+			opp-hz = /bits/ 64 <1250000000>;
+			opp-supported-hw = <0x01 0x0002>;
+			clock-latency-ns = <6000000>;
+			opp-suspend;
+		};
+	};
 };

---
base-commit: e3b32dcb9f23e3c3927ef3eec6a5842a988fb574
change-id: 20260122-am62l-dt-cpufreq-c24f0236ad15

Best regards,
-- 
Dhruva Gole <d-gole@ti.com>

Re: [PATCH] arm64: dts: ti: k3-am62l: support cpufreq

[Viresh Kumar]

On 22-01-26, 16:19, Dhruva Gole wrote:
> Enable CPUFreq support for AM62L SoC by adding the relevant OPP efuse table
> syscon to k3-am62l-wakeup.dtsi for speed grade detection.
> 
> Add the operating-points-v2 table with CPU frequency steps from 200MHz to
> 1.25GHz to k3-am62l3.dtsi
> 
> Configure CPU clocks to reference the SCMI clock controller for frequency
> scaling
> 
> This enables proper CPU frequency scaling capabilities for the AM62L SoC
> using the ARM SCMI protocol to interact with the power management firmware.
> 
> Signed-off-by: Dhruva Gole <d-gole@ti.com>
> ---
> The driver changes were merged previously [0], and so the DT patch
> is now being posted seperately. 

This should still be marked V4 with all previous version history.
(Don't resend just for that now).

-- 
viresh

Re: [PATCH] arm64: dts: ti: k3-am62l: support cpufreq

[Dhruva Gole]

On Jan 22, 2026 at 16:56:21 +0530, Viresh Kumar wrote:
> On 22-01-26, 16:19, Dhruva Gole wrote:
> > Enable CPUFreq support for AM62L SoC by adding the relevant OPP efuse table
> > syscon to k3-am62l-wakeup.dtsi for speed grade detection.
> > 
> > Add the operating-points-v2 table with CPU frequency steps from 200MHz to
> > 1.25GHz to k3-am62l3.dtsi
> > 
> > Configure CPU clocks to reference the SCMI clock controller for frequency
> > scaling
> > 
> > This enables proper CPU frequency scaling capabilities for the AM62L SoC
> > using the ARM SCMI protocol to interact with the power management firmware.
> > 
> > Signed-off-by: Dhruva Gole <d-gole@ti.com>
> > ---
> > The driver changes were merged previously [0], and so the DT patch
> > is now being posted seperately. 
> 
> This should still be marked V4 with all previous version history.
> (Don't resend just for that now).

Okay next revision will mark as v5, and add this link for v4 changelog.

> 
> -- 
> viresh

-- 
Best regards,
Dhruva Gole
Texas Instruments Incorporated

Re: [PATCH] arm64: dts: ti: k3-am62l: support cpufreq

[Kendall Willis]

On 1/22/26 04:49, Dhruva Gole wrote:
> Enable CPUFreq support for AM62L SoC by adding the relevant OPP efuse table
> syscon to k3-am62l-wakeup.dtsi for speed grade detection.
> 
> Add the operating-points-v2 table with CPU frequency steps from 200MHz to
> 1.25GHz to k3-am62l3.dtsi
> 
> Configure CPU clocks to reference the SCMI clock controller for frequency
> scaling
> 
> This enables proper CPU frequency scaling capabilities for the AM62L SoC
> using the ARM SCMI protocol to interact with the power management firmware.
> 
> Signed-off-by: Dhruva Gole <d-gole@ti.com>
> ---
> The driver changes were merged previously [0], and so the DT patch
> is now being posted seperately.
> 
> Logs:
> 
> root@am62lxx-evm:~# cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_frequencies
> 200000 400000 600000 800000 1000000 1250000
> 200000 400000 600000 800000 1000000 1250000
> 
> Changelog:
> - fix the bit fiels in the OPPs as per Kendall's suggestion
> - Fix the scmi_clk ID of the second A53 core
> 
> [1] https://lore.kernel.org/all/20260120-am62l-cpufreq-v3-0-8c69b80168a3@ti.com/
> ---
>   arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi |  5 +++
>   arch/arm64/boot/dts/ti/k3-am62l3.dtsi       | 47 +++++++++++++++++++++++++++++
>   2 files changed, 52 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi
> index 61bfcdcfc66ea8d802a36ed43cd01fbbf3decc70..a42ccd0d2fcc4d204cae81508f839c44ce83f558 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi
> @@ -127,6 +127,11 @@ chipid: chipid@14 {
>   			bootph-all;
>   		};
>   
> +		opp_efuse_table: syscon@18 {
> +			compatible = "ti,am62-opp-efuse-table", "syscon";
> +			reg = <0x18 0x4>;
> +		};
> +
>   		cpsw_mac_syscon: ethernet-mac-syscon@2000 {
>   			compatible = "ti,am62p-cpsw-mac-efuse", "syscon";
>   			reg = <0x2000 0x8>;
> diff --git a/arch/arm64/boot/dts/ti/k3-am62l3.dtsi b/arch/arm64/boot/dts/ti/k3-am62l3.dtsi
> index da220b85151227c63f59b2b8ec48ae2ebb37e7bf..26d3040ff53259daba21b39a55bb8a2ed65d4e8f 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62l3.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62l3.dtsi
> @@ -39,6 +39,8 @@ cpu0: cpu@0 {
>   			d-cache-line-size = <64>;
>   			d-cache-sets = <128>;
>   			next-level-cache = <&l2_0>;
> +			operating-points-v2 = <&a53_opp_table>;
> +			clocks = <&scmi_clk 356>;
>   		};
>   
>   		cpu1: cpu@1 {
> @@ -53,6 +55,8 @@ cpu1: cpu@1 {
>   			d-cache-line-size = <64>;
>   			d-cache-sets = <128>;
>   			next-level-cache = <&l2_0>;
> +			operating-points-v2 = <&a53_opp_table>;
> +			clocks = <&scmi_clk 357>;
>   		};
>   	};
>   
> @@ -64,4 +68,47 @@ l2_0: l2-cache0 {
>   		cache-line-size = <64>;
>   		cache-sets = <256>;
>   	};
> +
> +	a53_opp_table: opp-table {
> +		compatible = "operating-points-v2-ti-cpu";
> +		opp-shared;
> +		syscon = <&opp_efuse_table>;
> +
> +		opp-200000000 {
> +			opp-hz = /bits/ 64 <200000000>;
> +			opp-supported-hw = <0x01 0x0003>;
> +			clock-latency-ns = <6000000>;
> +		};
> +
> +		opp-400000000 {
> +			opp-hz = /bits/ 64 <400000000>;
> +			opp-supported-hw = <0x01 0x0003>;
> +			clock-latency-ns = <6000000>;
> +		};
> +
> +		opp-600000000 {
> +			opp-hz = /bits/ 64 <600000000>;
> +			opp-supported-hw = <0x01 0x0003>;
> +			clock-latency-ns = <6000000>;
> +		};
> +
> +		opp-800000000 {
> +			opp-hz = /bits/ 64 <800000000>;
> +			opp-supported-hw = <0x01 0x0003>;
> +			clock-latency-ns = <6000000>;
> +		};
> +
> +		opp-1000000000 {
> +			opp-hz = /bits/ 64 <1000000000>;
> +			opp-supported-hw = <0x01 0x0003>;
> +			clock-latency-ns = <6000000>;
> +		};

Thanks for implementing the feedback! One last thing is I think 
opp-1000000000 should have the opp-supported-hw value of 0x02 because 
speed grade E only supports up to 833 MHz.

> +
> +		opp-1250000000 {
> +			opp-hz = /bits/ 64 <1250000000>;
> +			opp-supported-hw = <0x01 0x0002>;
> +			clock-latency-ns = <6000000>;
> +			opp-suspend;
> +		};
> +	};
>   };
> 
> ---
> base-commit: e3b32dcb9f23e3c3927ef3eec6a5842a988fb574
> change-id: 20260122-am62l-dt-cpufreq-c24f0236ad15
> 
> Best regards,

Best,
Kendall Willis <k-willis@ti.com>

Re: [PATCH] arm64: dts: ti: k3-am62l: support cpufreq

[Dhruva Gole]

On Jan 22, 2026 at 08:36:45 -0600, Kendall Willis wrote:
> On 1/22/26 04:49, Dhruva Gole wrote:
> > Enable CPUFreq support for AM62L SoC by adding the relevant OPP efuse table
> > syscon to k3-am62l-wakeup.dtsi for speed grade detection.
> > 
> > Add the operating-points-v2 table with CPU frequency steps from 200MHz to
> > 1.25GHz to k3-am62l3.dtsi
> > 
> > Configure CPU clocks to reference the SCMI clock controller for frequency
> > scaling
> > 
> > This enables proper CPU frequency scaling capabilities for the AM62L SoC
> > using the ARM SCMI protocol to interact with the power management firmware.
> > 
> > Signed-off-by: Dhruva Gole <d-gole@ti.com>
> > ---
> > The driver changes were merged previously [0], and so the DT patch
> > is now being posted seperately.
> > 
> > Logs:
> > 
> > root@am62lxx-evm:~# cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_frequencies
> > 200000 400000 600000 800000 1000000 1250000
> > 200000 400000 600000 800000 1000000 1250000
> > 
> > Changelog:
> > - fix the bit fiels in the OPPs as per Kendall's suggestion
> > - Fix the scmi_clk ID of the second A53 core
> > 
> > [1] https://lore.kernel.org/all/20260120-am62l-cpufreq-v3-0-8c69b80168a3@ti.com/
> > ---
> >   arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi |  5 +++
> >   arch/arm64/boot/dts/ti/k3-am62l3.dtsi       | 47 +++++++++++++++++++++++++++++
> >   2 files changed, 52 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi
> > index 61bfcdcfc66ea8d802a36ed43cd01fbbf3decc70..a42ccd0d2fcc4d204cae81508f839c44ce83f558 100644
> > --- a/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi
> > +++ b/arch/arm64/boot/dts/ti/k3-am62l-wakeup.dtsi
> > @@ -127,6 +127,11 @@ chipid: chipid@14 {
> >   			bootph-all;
> >   		};
> > +		opp_efuse_table: syscon@18 {
> > +			compatible = "ti,am62-opp-efuse-table", "syscon";
> > +			reg = <0x18 0x4>;
> > +		};
> > +
> >   		cpsw_mac_syscon: ethernet-mac-syscon@2000 {
> >   			compatible = "ti,am62p-cpsw-mac-efuse", "syscon";
> >   			reg = <0x2000 0x8>;
> > diff --git a/arch/arm64/boot/dts/ti/k3-am62l3.dtsi b/arch/arm64/boot/dts/ti/k3-am62l3.dtsi
> > index da220b85151227c63f59b2b8ec48ae2ebb37e7bf..26d3040ff53259daba21b39a55bb8a2ed65d4e8f 100644
> > --- a/arch/arm64/boot/dts/ti/k3-am62l3.dtsi
> > +++ b/arch/arm64/boot/dts/ti/k3-am62l3.dtsi
> > @@ -39,6 +39,8 @@ cpu0: cpu@0 {
> >   			d-cache-line-size = <64>;
> >   			d-cache-sets = <128>;
> >   			next-level-cache = <&l2_0>;
> > +			operating-points-v2 = <&a53_opp_table>;
> > +			clocks = <&scmi_clk 356>;
> >   		};
> >   		cpu1: cpu@1 {
> > @@ -53,6 +55,8 @@ cpu1: cpu@1 {
> >   			d-cache-line-size = <64>;
> >   			d-cache-sets = <128>;
> >   			next-level-cache = <&l2_0>;
> > +			operating-points-v2 = <&a53_opp_table>;
> > +			clocks = <&scmi_clk 357>;
> >   		};
> >   	};
> > @@ -64,4 +68,47 @@ l2_0: l2-cache0 {
> >   		cache-line-size = <64>;
> >   		cache-sets = <256>;
> >   	};
> > +
> > +	a53_opp_table: opp-table {
> > +		compatible = "operating-points-v2-ti-cpu";
> > +		opp-shared;
> > +		syscon = <&opp_efuse_table>;
> > +
> > +		opp-200000000 {
> > +			opp-hz = /bits/ 64 <200000000>;
> > +			opp-supported-hw = <0x01 0x0003>;
> > +			clock-latency-ns = <6000000>;
> > +		};
> > +
> > +		opp-400000000 {
> > +			opp-hz = /bits/ 64 <400000000>;
> > +			opp-supported-hw = <0x01 0x0003>;
> > +			clock-latency-ns = <6000000>;
> > +		};
> > +
> > +		opp-600000000 {
> > +			opp-hz = /bits/ 64 <600000000>;
> > +			opp-supported-hw = <0x01 0x0003>;
> > +			clock-latency-ns = <6000000>;
> > +		};
> > +
> > +		opp-800000000 {
> > +			opp-hz = /bits/ 64 <800000000>;
> > +			opp-supported-hw = <0x01 0x0003>;
> > +			clock-latency-ns = <6000000>;
> > +		};
> > +
> > +		opp-1000000000 {
> > +			opp-hz = /bits/ 64 <1000000000>;
> > +			opp-supported-hw = <0x01 0x0003>;
> > +			clock-latency-ns = <6000000>;
> > +		};
> 
> Thanks for implementing the feedback! One last thing is I think
> opp-1000000000 should have the opp-supported-hw value of 0x02 because speed
> grade E only supports up to 833 MHz.

Okay fixing this in the next revision.

> 
> > +
> > +		opp-1250000000 {
> > +			opp-hz = /bits/ 64 <1250000000>;
> > +			opp-supported-hw = <0x01 0x0002>;
> > +			clock-latency-ns = <6000000>;
> > +			opp-suspend;
> > +		};
> > +	};
> >   };
> > 
> > ---
> > base-commit: e3b32dcb9f23e3c3927ef3eec6a5842a988fb574
> > change-id: 20260122-am62l-dt-cpufreq-c24f0236ad15
> > 
> > Best regards,
> 
> Best,
> Kendall Willis <k-willis@ti.com>
> 

-- 
Best regards,
Dhruva Gole
Texas Instruments Incorporated

Re: [PATCH] arm64: dts: ti: k3-am62l: support cpufreq

[Kendall Willis]

On 1/22/26 04:49, Dhruva Gole wrote:
> Enable CPUFreq support for AM62L SoC by adding the relevant OPP efuse table
> syscon to k3-am62l-wakeup.dtsi for speed grade detection.
> 
> Add the operating-points-v2 table with CPU frequency steps from 200MHz to
> 1.25GHz to k3-am62l3.dtsi
> 
> Configure CPU clocks to reference the SCMI clock controller for frequency
> scaling
> 
> This enables proper CPU frequency scaling capabilities for the AM62L SoC
> using the ARM SCMI protocol to interact with the power management firmware.
> 
> Signed-off-by: Dhruva Gole <d-gole@ti.com>

Reviewed-by: Kendall Willis <k-willis@ti.com>

Best,
Kendall Willis <k-willis@ti.com>

Re: [PATCH] arm64: dts: ti: k3-am62l: support cpufreq

[Kendall Willis]

On 1/22/26 10:14, Kendall Willis wrote:
> On 1/22/26 04:49, Dhruva Gole wrote:
>> Enable CPUFreq support for AM62L SoC by adding the relevant OPP efuse 
>> table
>> syscon to k3-am62l-wakeup.dtsi for speed grade detection.
>>
>> Add the operating-points-v2 table with CPU frequency steps from 200MHz to
>> 1.25GHz to k3-am62l3.dtsi
>>
>> Configure CPU clocks to reference the SCMI clock controller for frequency
>> scaling
>>
>> This enables proper CPU frequency scaling capabilities for the AM62L SoC
>> using the ARM SCMI protocol to interact with the power management 
>> firmware.
>>
>> Signed-off-by: Dhruva Gole <d-gole@ti.com>
> 
> Reviewed-by: Kendall Willis <k-willis@ti.com>
> 
> Best,
> Kendall Willis <k-willis@ti.com>

Oops sent my reviewed by on the wrong revision.

Best,
Kendall Willis