linux-kernel - Re: [PATCH 4/4] soc: mediatek: Add MT2701/MT7623 scpsys driver

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Message-ID: <1451971439.19026.3.camel@mtksdaap41>
Date:	Tue, 5 Jan 2016 13:23:59 +0800
From:	James Liao <jamesjj.liao@...iatek.com>
To:	Matthias Brugger <matthias.bgg@...il.com>
CC:	Daniel Kurtz <djkurtz@...omium.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Kevin Hilman <khilman@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-mediatek@...ts.infradead.org>,
	Shunli Wang <shunli.wang@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/4] soc: mediatek: Add MT2701/MT7623 scpsys driver

Hi Matthias,
On Wed, 2015-12-30 at 18:49 +0100, Matthias Brugger wrote:
> > On Wed, 2015-12-30 at 17:01 +0800, Daniel Kurtz wrote:
> >> On Wed, Dec 30, 2015 at 2:41 PM, James Liao <jamesjj.liao@...iatek.com> wrote:
> >>>
> >>> From: Shunli Wang <shunli.wang@...iatek.com>
> >>>
> >>> Add scpsys driver for MT2701 and MT7623.
> >>>
> >>> Signed-off-by: Shunli Wang <shunli.wang@...iatek.com>
> >>> Signed-off-by: James Liao <jamesjj.liao@...iatek.com>
> >>> ---
> >>>   drivers/soc/mediatek/Kconfig             |  11 +++
> >>>   drivers/soc/mediatek/Makefile            |   1 +
> >>>   drivers/soc/mediatek/mtk-scpsys-mt2701.c | 161 +++++++++++++++++++++++++++++++
> >>>   3 files changed, 173 insertions(+)
> >>>   create mode 100644 drivers/soc/mediatek/mtk-scpsys-mt2701.c
> >>>
> >>> diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
> >>> index eca6fb7..92cf838 100644
> >>> --- a/drivers/soc/mediatek/Kconfig
> >>> +++ b/drivers/soc/mediatek/Kconfig
> >>> @@ -39,3 +39,14 @@ config MTK_SCPSYS_MT8173
> >>>            driver.
> >>>            The System Control Processor System (SCPSYS) has several power
> >>>            management related tasks in the system.
> >>> +
> >>> +config MTK_SCPSYS_MT2701
> >>> +       bool "SCPSYS Support MediaTek MT2701 and MT7623"
> >>> +       depends on ARCH_MEDIATEK || COMPILE_TEST
> >>> +       select MTK_SCPSYS
> >>> +       default ARCH_MEDIATEK
> >>> +       help
> >>> +         Say yes here to add support for the MT2701/MT7623 SCPSYS power
> >>> +         domain driver.
> >>> +         The System Control Processor System (SCPSYS) has several power
> >>> +         management related tasks in the system.
> >>
> >> I don't think we really want different drivers and Kconfig options.
> >>
> >> Can we just use different compatibles to select the appropriate scp_domain_data?
> >
> > Yes, we can. All scpsys drivers are built-in by default, and they will
> > be activate by specific compatible string.
> >
> > But some projects don't want to build unused drivers into kernel to save
> > code size. Use different Kconfig options for each SoC so that these
> > projects can disable unused drivers.
> >
> 
> Scpsys is a bool right now, you can disable it if you don't need it for 
> your project.
> 
> I don't think the impact of adding scp_domain_data justifies adding SoC 
> specific scpsys drivers and bloat the drivers/soc/mediatek folder.

So you prefer to enable MT8173 and MT2701 scpsys drivers at the same
time if MTK_SCPSYS is true?

BTW, this patchset is based on 4.4-rc7, which lacks two patches from
your v4.4-next/soc. Should I rebase to v4.4-next/soc when I send v2
patch?


Best regards,

James


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