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    SubjectRe: [PATCH v2 00/48] Introduce core voltage scaling for NVIDIA Tegra20/30 SoCs
    On Thu, Dec 17, 2020 at 09:05:50PM +0300, Dmitry Osipenko wrote:
    > Introduce core voltage scaling for NVIDIA Tegra20/30 SoCs, which reduces
    > power consumption and heating of the Tegra chips. Tegra SoC has multiple
    > hardware units which belong to a core power domain of the SoC and share
    > the core voltage. The voltage must be selected in accordance to a minimum
    > requirement of every core hardware unit.
    >
    > The minimum core voltage requirement depends on:
    >
    > 1. Clock enable state of a hardware unit.
    > 2. Clock frequency.
    > 3. Unit's internal idling/active state.
    >
    > This series is tested on Acer A500 (T20), AC100 (T20), Nexus 7 (T30),
    > Ouya (T30), TK1 (T124) and some others. I also added voltage scaling to
    > the Ventana (T20) and Cardhu (T30) boards which are tested by NVIDIA's CI
    > farm. Tegra30 is now couple degrees cooler on Nexus 7 and stays cool on
    > Ouya (instead of becoming burning hot) while system is idling. It should
    > be possible to improve this further by implementing a more advanced power
    > management features for the kernel drivers.
    >
    > The DVFS support is opt-in for all boards, meaning that older DTBs will
    > continue to work like they did it before this series. It should be possible
    > to easily add the core voltage scaling support for Tegra114+ SoCs based on
    > this grounding work later on, if anyone will want to implement it.

    The same comment as for your interconnect work: for sets touching
    multiple systems please mention the dependencies between patches in the
    cover letter. Not as a reply to such remark like I make here, but as a
    separate entry in the cover letter.

    Best regards,
    Krzysztof

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