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

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Message-ID: <42d55695-9db0-b835-4837-8dae6e76046c@collabora.com>
Date:   Thu, 17 Nov 2022 10:12:55 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, agross@...nel.org
Cc:     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

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.

Cheers!
Angelo