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

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Message-ID: <20220913114927.an5n5cv5tzd3lypc@pengutronix.de>
Date:   Tue, 13 Sep 2022 13:49:27 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        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 22-09-13, Krzysztof Kozlowski wrote:
> On 13/09/2022 12:29, 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.
> > 
> > https://patchwork.kernel.org/project/linux-clk/list/?series=676522
> 
> Your proposal does not change bindings. You cannot introduce new
> properties without documenting them in the bindings.

As said, it is a proposal. Bindings will be added if it would be
accepted.

Regards,
  Marco