linux-kernel - Re: [PATCH v1 0/3] Add required-opps support to devfreq passive gov

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Message-ID: <20190625041054.2ceuvnuuebc6hsr5@vireshk-i7>
Date:   Tue, 25 Jun 2019 09:40:54 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 0/3] Add required-opps support to devfreq passive gov

On 24-06-19, 15:17, Saravana Kannan wrote:
> Here's an example. This can't be done today, but can be done with this change.
> 
> In arch/arm64/boot/dts/exynos/exynos5433-bus.dtsi you have something
> like this with the following changes:
> 
>         bus_g2d_400: bus0 {
>                 compatible = "samsung,exynos-bus";
>                 clocks = <&cmu_top CLK_ACLK_G2D_400>;
>                 clock-names = "bus";
>                 operating-points-v2 = <&bus_g2d_400_opp_table>;
>                 status = "disabled";
>         };
> 
>         bus_noc2: bus9 {
>                 compatible = "samsung,exynos-bus";
>                 clocks = <&cmu_mif CLK_ACLK_BUS2_400>;
>                 clock-names = "bus";
>                 operating-points-v2 = <&bus_noc2_opp_table>;
>                 status = "disabled";
>         };

And what is the relation between these two busses ?

>         bus_g2d_400_opp_table: opp_table2 {
>                 compatible = "operating-points-v2";
>                 opp-shared;
> 
>                 opp-400000000 {
>                         opp-hz = /bits/ 64 <400000000>;
>                         opp-microvolt = <1075000>;
> +                       required-opps = <&noc2_400>;
>                 };
>                 opp-267000000 {
>                         opp-hz = /bits/ 64 <267000000>;
>                         opp-microvolt = <1000000>;
> +                       required-opps = <&noc2_200>;
>                 };
>                 opp-200000000 {
>                         opp-hz = /bits/ 64 <200000000>;
>                         opp-microvolt = <975000>;
> +                       required-opps = <&noc2_200>;
>                 };
>                 opp-160000000 {
>                         opp-hz = /bits/ 64 <160000000>;
>                         opp-microvolt = <962500>;
> +                       required-opps = <&noc2_134>;
>                 };
>                 opp-134000000 {
>                         opp-hz = /bits/ 64 <134000000>;
>                         opp-microvolt = <950000>;
> +                       required-opps = <&noc2_134>;
>                 };
>                 opp-100000000 {
>                         opp-hz = /bits/ 64 <100000000>;
>                         opp-microvolt = <937500>;
> +                       required-opps = <&noc2_100>;
>                 };
>         };
> 
>         bus_noc2_opp_table: opp_table6 {
>                 compatible = "operating-points-v2";
> 
> -               opp-400000000 {
> +               noc2_400: opp-400000000 {
>                         opp-hz = /bits/ 64 <400000000>;
>                 };
> -               opp-200000000 {
> +               noc2_200: opp-200000000 {
>                         opp-hz = /bits/ 64 <200000000>;
>                 };
> -               opp-134000000 {
> +               noc2_134: opp-134000000 {
>                         opp-hz = /bits/ 64 <134000000>;
>                 };
> -               opp-100000000 {
> +               noc2_100: opp-100000000 {
>                         opp-hz = /bits/ 64 <100000000>;
>                 };
>         };
> 
> Thanks,
> Saravana

-- 
viresh