From: Stephen Warren <swarren@wwwdotorg.org>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Nishanth Menon <nm@ti.com>, Stephen Boyd <sboyd@kernel.org>,
Marcel Ziswiler <marcel.ziswiler@toradex.com>,
linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 09/17] ARM: dts: tegra20: harmony: Setup voltage regulators for DVFS
Date: Mon, 22 Oct 2018 09:33:23 -0600 [thread overview]
Message-ID: <a1b4cd27-858c-de53-8ae2-b1aee689475f@wwwdotorg.org> (raw)
In-Reply-To: <20181021205501.23943-10-digetx@gmail.com>
On 10/21/18 2:54 PM, Dmitry Osipenko wrote:
> Set min/max regulators voltage and add CPU node that hooks up CPU with
> voltage regulators.
> diff --git a/arch/arm/boot/dts/tegra20-harmony.dts b/arch/arm/boot/dts/tegra20-harmony.dts
> - sm0 {
> + core_vdd_reg: sm0 {
> regulator-name = "vdd_sm0,vdd_core";
> - regulator-min-microvolt = <1200000>;
> - regulator-max-microvolt = <1200000>;
> + regulator-min-microvolt = <1000000>;
> + regulator-max-microvolt = <1300000>;
> + regulator-coupled-with = <&rtc_vdd_reg>;
> + regulator-coupled-max-spread = <150000>;
> regulator-always-on;
> };
How do you know for sure that these increased ranges are safe (high end)
and stable (low end) for this particular board? IIRC the safe/legal
range depends on the chip SKU, and to be honest I have no idea which SKU
is present on Harmony... For public boards like Colibri I imagine
there's enough information out there to tell what will work, but maybe
not our internal boards like Harmony, unless you checked our ancient
downstream kernels?
next prev parent reply other threads:[~2018-10-22 15:43 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-21 20:54 [RFC PATCH v2 00/17] CPUFREQ OPP's, DVFS and Tegra30 support by tegra20-cpufreq driver Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 01/17] OPP: Allow to request stub voltage regulators Dmitry Osipenko
2018-10-22 5:36 ` Viresh Kumar
2018-10-22 11:29 ` Dmitry Osipenko
2018-10-22 11:32 ` Viresh Kumar
2018-10-22 12:12 ` Dmitry Osipenko
2018-10-24 6:41 ` Viresh Kumar
2018-10-26 12:03 ` Dmitry Osipenko
2018-10-26 15:37 ` Lucas Stach
2018-10-28 12:58 ` Dmitry Osipenko
2018-10-29 6:53 ` Viresh Kumar
2018-10-30 15:48 ` Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 02/17] soc/tegra: fuse: Export tegra_get_chip_id() Dmitry Osipenko
2018-10-21 21:33 ` Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 03/17] dt-bindings: cpufreq: Add binding for NVIDIA Tegra20/30 Dmitry Osipenko
2018-11-05 21:30 ` Rob Herring
2018-11-08 16:48 ` Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 04/17] cpufreq: tegra20: Support OPP, thermal cooling, DVFS and Tegra30 Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 05/17] ARM: tegra: Create tegra20-cpufreq device on Tegra30 Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 06/17] ARM: dts: tegra20: Add CPU Operating Performance Points Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 07/17] ARM: dts: tegra30: " Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 08/17] ARM: dts: tegra20: colibri: Setup voltage regulators for DVFS Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 09/17] ARM: dts: tegra20: harmony: " Dmitry Osipenko
2018-10-22 15:33 ` Stephen Warren [this message]
2018-10-22 22:59 ` Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 10/17] ARM: dts: tegra20: paz00: " Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 11/17] ARM: dts: tegra20: seaboard: " Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 12/17] ARM: dts: tegra20: tamonten: " Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 13/17] ARM: dts: tegra20: ventana: " Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 14/17] ARM: dts: tegra30: apalis: " Dmitry Osipenko
2018-10-21 20:54 ` [RFC PATCH v2 15/17] ARM: dts: tegra30: beaver: " Dmitry Osipenko
2018-10-21 20:55 ` [RFC PATCH v2 16/17] ARM: dts: tegra30: cardhu: " Dmitry Osipenko
2018-10-21 20:55 ` [RFC PATCH v2 17/17] ARM: dts: tegra30: colibri: " Dmitry Osipenko
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