linux-kernel - Re: [PATCH v3 2/2] soc: qcom: Add Qualcomm Ramp Controller driver

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Message-ID: <CAA8EJpov_cs-YNF+kPqvjTVSHTY-fGOmo0aKUo4L-23vepQQiA@mail.gmail.com>
Date:   Thu, 17 Nov 2022 13:59:28 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     agross@...nel.org, andersson@...nel.org,
        konrad.dybcio@...ainline.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        marijn.suijten@...ainline.org, kernel@...labora.com
Subject: Re: [PATCH v3 2/2] soc: qcom: Add Qualcomm Ramp Controller driver

On Thu, 17 Nov 2022 at 11:12, AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Il 16/11/22 14:46, Dmitry Baryshkov ha scritto:
> > On 15/11/2022 18:45, AngeloGioacchino Del Regno wrote:
> >> The Ramp Controller is used to program the sequence ID for pulse
> >> swallowing, enable sequence and linking sequence IDs for the CPU
> >> cores on some Qualcomm SoCs.
> >>
> >> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> >> ---
> >>   drivers/soc/qcom/Kconfig           |   9 +
> >>   drivers/soc/qcom/Makefile          |   1 +
> >>   drivers/soc/qcom/ramp_controller.c | 331 +++++++++++++++++++++++++++++
> >>   3 files changed, 341 insertions(+)
> >>   create mode 100644 drivers/soc/qcom/ramp_controller.c
> >>
> >
> > I'd allow myself to re-ask the same questions here:
> >
> > Generic question. regarding this controller. If it is supposed to work
> > close to DVCS, etc. Does ramp controller need any programming when
> > changing speed and/or APC voltage?
> > Is it necessary to turn ramp on and off during the runtime?
> >
>
> No, it's a set-and-forget type of programming. Turning that on/off during
> runtime is self-managed and, after the initial setting that this driver,
> no further action is required - or at least not from Linux.

Ack, thank you!


-- 
With best wishes
Dmitry