Re: [PATCH 00/12] soc: mediatek: pm-domains: Add new driver for SCPSYS power domains controller

Weiyi Lu
2020-10-06T06:53:35Z

On Fri, 2020-09-25 at 16:04 +0200, Matthias Brugger wrote:
>
> On 25/09/2020 12:06, Weiyi Lu wrote:
> > On Thu, 2020-09-10 at 19:28 +0200, Enric Balletbo i Serra wrote:
> >> Dear all,
> >>
> >> This is a new driver with the aim to deprecate the mtk-scpsys driver.
> >> The problem with that driver is that, in order to support more Mediatek
> >> SoCs you need to add some logic to handle properly the power-up
> >> sequence of newer Mediatek SoCs, doesn't handle parent-child power
> >> domains and need to hardcode all the clocks in the driver itself. The
> >> result is that the driver is getting bigger and bigger every time a
> >> new SoC needs to be supported.
> >>
> >
> > Hi Enric and Matthias,
> >
> > First of all, thank you for the patch. But I'm worried the problem you
> > mentioned won't be solved even if we work on this new driver in the
> > future. My work on the MT8183 scpsys(now v17) is to implement the new
> > hardware logic. Here, I also see related patches, which means that these
> > new logics are necessary. Why can't we work on the original driver?
>
> Well the decision was to change the driver in a not compatible way to make
> device tree entries better. If we work on the old driver, we would need to find
> some creative ways to handle old bindings vs new bindings.
>
> So I thought it would be better doing a fresh start implementing mt1873 support
> for reference and add mt8183 as new SoC. From what I have seen mt8192 and others
> fit the driver structure too.
>
> > Meanwhile, I thought maybe we should separate the driver into general
> > control and platform data for each SoC, otherwise it'll keep getting
> > bigger and bigger if it need to be support new SoC.
> >
>
> We could in a later series split the SoC depended data structures and put them
> in drivers/soc/mediatek/pm-domains-mt8183.h or something like this. Is that what
> you mean?
>

Yes, that is what I want. And I guess it could avoid the collisions in
the different defines to the control registers and power status bits you
mentioned. Hope this will happen in this series.

> > And consider DVFSRC
> > (dynamic voltage and frequency scaling resource collector), should we
> > keep the original driver name "scpsys" instead of "pm-domains" because
> > it may provide more functions than power domains?
> >
>
> It's on my list to look deeper into this series. The thing with the new driver
> is, that the binding takes into account, that scpsys has several hardware block,
> which are represented as child nodes in DTS. The pm-domains is just one of these
> functionalities and I think DVFSRC should be a new driver with a child node of
> scpsys in DTS. Does this make sense?
>
> Regards,
> Matthias
>
> >> All this information can be getted from a properly defined binding, so
> >> can be cleaner and smaller, hence, we implemented a new driver. For
> >> now, only MT8173 and MT8183 is supported but should be fairly easy to
> >> add support for new SoCs.
> >>
> >> Best regards,
> >> Enric
> >>
> >> Enric Balletbo i Serra (4):
> >> dt-bindings: power: Add bindings for the Mediatek SCPSYS power domains
> >> controller
> >> soc: mediatek: Add MediaTek SCPSYS power domains
> >> arm64: dts: mediatek: Add mt8173 power domain controller
> >> dt-bindings: power: Add MT8183 power domains
> >>
> >> Matthias Brugger (8):
> >> soc: mediatek: pm-domains: Add bus protection protocol
> >> soc: mediatek: pm_domains: Make bus protection generic
> >> soc: mediatek: pm-domains: Add SMI block as bus protection block
> >> soc: mediatek: pm-domains: Add extra sram control
> >> soc: mediatek: pm-domains: Add subsystem clocks
> >> soc: mediatek: pm-domains: Allow bus protection to ignore clear ack
> >> soc: mediatek: pm-domains: Add support for mt8183
> >> arm64: dts: mediatek: Add mt8183 power domains controller
> >>
> >> .../power/mediatek,power-controller.yaml | 173 ++++
> >> arch/arm64/boot/dts/mediatek/mt8173.dtsi | 78 +-
> >> arch/arm64/boot/dts/mediatek/mt8183.dtsi | 160 +++
> >> drivers/soc/mediatek/Kconfig | 13 +
> >> drivers/soc/mediatek/Makefile | 1 +
> >> drivers/soc/mediatek/mtk-infracfg.c | 5 -
> >> drivers/soc/mediatek/mtk-pm-domains.c | 952 ++++++++++++++++++
> >> include/dt-bindings/power/mt8183-power.h | 26 +
> >> include/linux/soc/mediatek/infracfg.h | 39 +
> >> 9 files changed, 1433 insertions(+), 14 deletions(-)
> >> create mode 100644 Documentation/devicetree/bindings/power/mediatek,power-controller.yaml
> >> create mode 100644 drivers/soc/mediatek/mtk-pm-domains.c
> >> create mode 100644 include/dt-bindings/power/mt8183-power.h
> >>
> >
>
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