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Message-ID: <4370037.mvXUDI8C0e@senjougahara>
Date: Wed, 21 Jan 2026 16:55:53 +0900
From: Mikko Perttunen <mperttunen@...dia.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Thierry Reding <treding@...dia.com>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Prashant Gaikwad <pgaikwad@...dia.com>,
Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>,
Dmitry Osipenko <digetx@...il.com>, MyungJoo Ham <myungjoo.ham@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>, Svyatoslav Ryhel <clamor95@...il.com>,
Svyatoslav Ryhel <clamor95@...il.com>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-tegra@...r.kernel.org, linux-clk@...r.kernel.org,
linux-pm@...r.kernel.org
Subject:
Re: [PATCH v4 11/12] ARM: tegra: Add EMC OPP and ICC properties to Tegra114
EMC and ACTMON device-tree nodes
On Tuesday, November 25, 2025 9:05 PM 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 | 151 ++++++++++++++++++
> arch/arm/boot/dts/nvidia/tegra114.dtsi | 9 ++
> 2 files changed, 160 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..1a0e68f22039
> --- /dev/null
> +++ b/arch/arm/boot/dts/nvidia/tegra114-peripherals-opp.dtsi
> @@ -0,0 +1,151 @@
> +// 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>;
> + };
What's the source of the opp data?
Cheers,
Mikko
> +
> + 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>;
> + };
> +
> + opp-528000000-1050 {
> + opp-microvolt = <1050000 1050000 1390000>;
> + opp-hz = /bits/ 64 <528000000>;
> + opp-supported-hw = <0x000E>;
> + };
> +
> + opp-528000000-1100 {
> + opp-microvolt = <1100000 1100000 1390000>;
> + opp-hz = /bits/ 64 <528000000>;
> + opp-supported-hw = <0x0001>;
> + };
> +
> + 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>;
> + };
> + };
> +
> + 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>;
> + };
> + };
> +};
> diff --git a/arch/arm/boot/dts/nvidia/tegra114.dtsi b/arch/arm/boot/dts/nvidia/tegra114.dtsi
> index a920ad041c14..6221423b81d1 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 {
>
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