From: Viresh Kumar <viresh.kumar@linaro.org>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
linux-pm@vger.kernel.org,
Vincent Guittot <vincent.guittot@linaro.org>,
Rafael Wysocki <rjw@rjwysocki.net>,
Stephen Boyd <sboyd@kernel.org>, Nishanth Menon <nm@ti.com>,
Stephan Gerhold <stephan@gerhold.net>,
devicetree@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] ARM: tegra: Pass multiple versions in opp-supported-hw property
Date: Mon, 31 Aug 2020 16:34:08 +0530 [thread overview]
Message-ID: <20200831110408.a6lwivim4w4jtkdc@vireshk-i7> (raw)
In-Reply-To: <cbfa012b-8f50-e460-972c-c51fa52bb858@gmail.com>
On 31-08-20, 12:54, Dmitry Osipenko wrote:
> It's not clear to me how it could be applicable to the Tegra CPU OPP
> because Tegra depends on a combination of SPEEDO + PROCESS versions.
>
> It's not like all voltages are the same for all OPPs that have the same
> PROCESS ID, otherwise it indeed would be nice to have
> "opp-microvolt-process0", but unfortunately this variant is not suitable
> for Tegra because some freqs have different voltages using the same
> PROCESS ID and the same applies to the SPEEDO ID.
How exactly do you know what voltage belongs to a particular OPP ?
opp@216000000 {
clock-latency-ns = <400000>;
opp-supported-hw = <0x0F 0x0003>;
opp-hz = /bits/ 64 <216000000>;
opp-microvolt-fast-process0 = <750000 750000 1125000>;
opp-microvolt-slow-process0 = <750000 850000 1125000>;
};
opp@312000000 {
clock-latency-ns = <400000>;
opp-supported-hw = <0x0F 0x0003>;
opp-hz = /bits/ 64 <312000000>;
opp-microvolt-fast-process0 = <750000 750000 1125000>;
opp-microvolt-slow-process0 = <750000 850000 1125000>;
};
You can make any combinations of such names that come from speedo,
process, or something else. If you can get this done as a fixed
formula then it is workable.
--
viresh
next prev parent reply other threads:[~2020-08-31 11:23 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-26 11:50 [PATCH 0/3] opp: Allow opp-supported-hw to contain multiple versions Viresh Kumar
2020-08-26 11:50 ` [PATCH 1/3] dt-bindings: " Viresh Kumar
2020-08-26 11:50 ` [PATCH 2/3] " Viresh Kumar
2020-08-26 16:59 ` Stephan Gerhold
2020-08-28 7:38 ` Dmitry Osipenko
2020-08-26 11:50 ` [PATCH 3/3] ARM: tegra: Pass multiple versions in opp-supported-hw property Viresh Kumar
2020-08-28 7:37 ` Dmitry Osipenko
2020-08-31 4:39 ` Viresh Kumar
2020-08-31 7:54 ` Dmitry Osipenko
2020-08-31 8:41 ` Viresh Kumar
2020-08-31 9:54 ` Dmitry Osipenko
2020-08-31 11:04 ` Viresh Kumar [this message]
2020-09-01 13:21 ` Dmitry Osipenko
2020-09-02 5:23 ` Viresh Kumar
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