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

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Message-ID: <1601028361.1346.38.camel@mtksdaap41>
Date:   Fri, 25 Sep 2020 18:06:01 +0800
From:   Weiyi Lu <weiyi.lu@...iatek.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
CC:     <linux-kernel@...r.kernel.org>,
        Collabora Kernel ML <kernel@...labora.com>,
        <fparent@...libre.com>, <matthias.bgg@...il.com>,
        <drinkcat@...omium.org>, <hsinyi@...omium.org>,
        Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH 00/12] soc: mediatek: pm-domains: Add new driver for
 SCPSYS power domains controller

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?
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.

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?

> 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
>