linux-kernel - Re: [PATCH V3 0/2] clk: imx: introduce fsl,always-on-clocks

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Date:   Tue, 13 Sep 2022 20:15:02 +0800
From:   Peng Fan <peng.fan@....nxp.com>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        abelvesa@...nel.org, abel.vesa@...aro.org, mturquette@...libre.com,
        sboyd@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com,
        linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>,
        linux-imx@....com, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH V3 0/2] clk: imx: introduce fsl,always-on-clocks



On 9/13/2022 6:29 PM, Marco Felsch wrote:
> Hi Peng,
> 
> On 22-09-13, Peng Fan (OSS) wrote:
>> From: Peng Fan <peng.fan@....com>
>>
>> V3:
>>   Rename to fsl,always-on-clocks
>>
>> V2:
>>   Use protected-clocks
>>   https://lore.kernel.org/all/20220816130327.2987710-1-peng.fan@oss.nxp.com/
>>
>> V1:
>>   Use fsl,protected-clocks
>>   https://lore.kernel.org/all/20220815033632.1687854-1-peng.fan@oss.nxp.com/
>>
>> There are two cases that I wanna this property could serve:
>> Virtualization: root cell linux run in parallel with inmate cell
>> AMP: M7/4 runs in parallel with A53
>>
>> The major case is:
>> Jailhouse hypervisor only support partition, so devices are partitioned.
>> But there is only CCM module that provides clock, the CCM is handled by
>> root cell linux, need make sure the root cell linux not shutdown the
>> clocks using by inmate cell.
>>
>> I was thinking whether need to provide a rate entry to ask root cell
>> configure the clk rate for inmate cell. But NXP downstream not have it,
>> see https://source.codeaurora.org/external/imx/linux-imx/tree/drivers/clk/imx/clk-imx8mp.c?h=lf-5.15.y#n690
>> So just leave the property as uint32-array.
> 
> Can you please check my recent proposal? I recently stumbled over such
> an issue on the mx8mm-evk as well but with the 32k clock provided by the
> pmic. Unfortunately I forgot to add you to the to list, I will change
> that. If that proposal will fix your problem, I would like to go the
> generic way.

I vote for a generic solution.

Thanks,
Peng.

> 
> https://patchwork.kernel.org/project/linux-clk/list/?series=676522
> 
> Regards,
>    Marco
> 
> 
>>
>> This patchset could also benifit AMP case, check the two commits
>> commit 19565ea12d61 ("clk: imx: add mcore_booted module paratemter")
>> commit d097cc045b64 ("clk: imx8mp: remove SYS PLL 1/2 clock gates")
>> Although I not plan to drop the upper two patches, this patchset
>> exposes opportunity for better power consumption.
>>
>> Peng Fan (2):
>>    dt-bindings: clock: imx8m/imx93: introduce fsl,always-on-clocks
>>      property
>>    clk: imx: support fsl,always-on-clocks
>>
>>   .../bindings/clock/imx8m-clock.yaml           |  4 ++++
>>   .../bindings/clock/imx93-clock.yaml           |  4 ++++
>>   drivers/clk/imx/clk-imx8mm.c                  |  2 ++
>>   drivers/clk/imx/clk-imx8mn.c                  |  2 ++
>>   drivers/clk/imx/clk-imx8mp.c                  |  2 ++
>>   drivers/clk/imx/clk-imx8mq.c                  |  2 ++
>>   drivers/clk/imx/clk.c                         | 21 +++++++++++++++++++
>>   drivers/clk/imx/clk.h                         |  2 ++
>>   8 files changed, 39 insertions(+)
>>
>> -- 
>> 2.37.1
>>
>>
>>