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Message-ID: <6698837.lOV4Wx5bFT@senjougahara>
Date: Fri, 06 Feb 2026 12:40:46 +0900
From: Mikko Perttunen <mperttunen@...dia.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Svyatoslav Ryhel <clamor95@...il.com>, Svyatoslav Ryhel <clamor95@...il.com>
Cc: devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject:
Re: [PATCH v1 3/5] ARM: tegra: Add EMC OPP and ICC properties to Tegra114 EMC
and ACTMON device-tree nodes
On Tuesday, January 27, 2026 4:15 AM Svyatoslav Ryhel wrote:
> Add EMC OPP tables and interconnect paths that will be used for dynamic
> memory bandwidth scaling based on memory utilization statistics.
>
> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
> ---
> .../dts/nvidia/tegra114-peripherals-opp.dtsi | 164 ++++++++++++++++++
> arch/arm/boot/dts/nvidia/tegra114.dtsi | 9 +
> 2 files changed, 173 insertions(+)
> create mode 100644 arch/arm/boot/dts/nvidia/tegra114-peripherals-opp.dtsi
>
> diff --git a/arch/arm/boot/dts/nvidia/tegra114-peripherals-opp.dtsi b/arch/arm/boot/dts/nvidia/tegra114-peripherals-opp.dtsi
> new file mode 100644
> index 000000000000..b40a1c24abab
> --- /dev/null
> +++ b/arch/arm/boot/dts/nvidia/tegra114-peripherals-opp.dtsi
> @@ -0,0 +1,164 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/ {
> + emc_icc_dvfs_opp_table: opp-table-emc {
> + compatible = "operating-points-v2";
> +
> + opp-12750000-900 {
> + opp-microvolt = <900000 900000 1390000>;
> + opp-hz = /bits/ 64 <12750000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + opp-20400000-900 {
> + opp-microvolt = <900000 900000 1390000>;
> + opp-hz = /bits/ 64 <20400000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + opp-40800000-900 {
> + opp-microvolt = <900000 900000 1390000>;
> + opp-hz = /bits/ 64 <40800000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + opp-68000000-900 {
> + opp-microvolt = <900000 900000 1390000>;
> + opp-hz = /bits/ 64 <68000000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + opp-102000000-900 {
> + opp-microvolt = <900000 900000 1390000>;
> + opp-hz = /bits/ 64 <102000000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + opp-204000000-900 {
> + opp-microvolt = <900000 900000 1390000>;
> + opp-hz = /bits/ 64 <204000000>;
> + opp-supported-hw = <0x000F>;
> + opp-suspend;
> + };
> +
> + opp-312000000-1000 {
> + opp-microvolt = <1000000 1000000 1390000>;
> + opp-hz = /bits/ 64 <312000000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + opp-408000000-1000 {
> + opp-microvolt = <1000000 1000000 1390000>;
> + opp-hz = /bits/ 64 <408000000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + /*
> + * T40X can work with 1050mV for 528MHz but T40T which is
> + * in the same group as T40X requires 1100mV. If there will
> + * be enough data that T40T can work reliably with 1050mV
> + * for 528MHz then voltage for 528MHz opp can be lowered.
> + * T40S should remain with 1100mV for 528MHz opp.
> + */
> + opp-528000000-1100 {
> + opp-microvolt = <1100000 1100000 1390000>;
> + opp-hz = /bits/ 64 <528000000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + opp-624000000-1100 {
> + opp-microvolt = <1100000 1100000 1390000>;
> + opp-hz = /bits/ 64 <624000000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + opp-792000000-1100 {
> + opp-microvolt = <1100000 1100000 1390000>;
> + opp-hz = /bits/ 64 <792000000>;
> + opp-supported-hw = <0x000F>;
> + };
> +
> + opp-900000000-1200 {
> + opp-microvolt = <1200000 1200000 1390000>;
> + opp-hz = /bits/ 64 <900000000>;
> + opp-supported-hw = <0x000E>;
> + };
> + };
> +
> + emc_bw_dfs_opp_table: opp-table-actmon {
> + compatible = "operating-points-v2";
> +
> + opp-12750000 {
> + opp-hz = /bits/ 64 <12750000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <204000>;
> + };
> +
> + opp-20400000 {
> + opp-hz = /bits/ 64 <20400000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <326400>;
> + };
> +
> + opp-40800000 {
> + opp-hz = /bits/ 64 <40800000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <652800>;
> + };
> +
> + opp-68000000 {
> + opp-hz = /bits/ 64 <68000000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <1088000>;
> + };
> +
> + opp-102000000 {
> + opp-hz = /bits/ 64 <102000000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <1632000>;
> + };
> +
> + opp-204000000 {
> + opp-hz = /bits/ 64 <204000000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <3264000>;
> + opp-suspend;
> + };
> +
> + opp-312000000 {
> + opp-hz = /bits/ 64 <312000000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <4992000>;
> + };
> +
> + opp-408000000 {
> + opp-hz = /bits/ 64 <408000000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <6528000>;
> + };
> +
> + opp-528000000 {
> + opp-hz = /bits/ 64 <528000000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <8448000>;
> + };
> +
> + opp-624000000 {
> + opp-hz = /bits/ 64 <624000000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <9984000>;
> + };
> +
> + opp-792000000 {
> + opp-hz = /bits/ 64 <792000000>;
> + opp-supported-hw = <0x000F>;
> + opp-peak-kBps = <12672000>;
> + };
> +
> + opp-900000000 {
> + opp-hz = /bits/ 64 <900000000>;
> + opp-supported-hw = <0x000E>;
> + opp-peak-kBps = <14400000>;
> + };
> + };
> +};
> diff --git a/arch/arm/boot/dts/nvidia/tegra114.dtsi b/arch/arm/boot/dts/nvidia/tegra114.dtsi
> index 77ab17f397f6..9acba15fba25 100644
> --- a/arch/arm/boot/dts/nvidia/tegra114.dtsi
> +++ b/arch/arm/boot/dts/nvidia/tegra114.dtsi
> @@ -8,6 +8,8 @@
> #include <dt-bindings/soc/tegra-pmc.h>
> #include <dt-bindings/thermal/tegra114-soctherm.h>
>
> +#include "tegra114-peripherals-opp.dtsi"
> +
> / {
> compatible = "nvidia,tegra114";
> interrupt-parent = <&lic>;
> @@ -323,6 +325,9 @@ actmon: actmon@...0c800 {
> clock-names = "actmon", "emc";
> resets = <&tegra_car TEGRA114_CLK_ACTMON>;
> reset-names = "actmon";
> + operating-points-v2 = <&emc_bw_dfs_opp_table>;
> + interconnects = <&mc TEGRA114_MC_MPCORER &emc>;
> + interconnect-names = "cpu-read";
> #cooling-cells = <2>;
> };
>
> @@ -655,6 +660,7 @@ mc: memory-controller@...19000 {
>
> #reset-cells = <1>;
> #iommu-cells = <1>;
> + #interconnect-cells = <1>;
> };
>
> emc: external-memory-controller@...1b000 {
> @@ -665,6 +671,9 @@ emc: external-memory-controller@...1b000 {
> clock-names = "emc";
>
> nvidia,memory-controller = <&mc>;
> + operating-points-v2 = <&emc_icc_dvfs_opp_table>;
> +
> + #interconnect-cells = <0>;
> };
>
> hda@...30000 {
>
Reviewed-by: Mikko Perttunen <mperttunen@...dia.com>
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