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

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Date:	Wed, 30 Dec 2015 18:49:31 +0100
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	James Liao <jamesjj.liao@...iatek.com>,
	Daniel Kurtz <djkurtz@...omium.org>
Cc:	Sascha Hauer <kernel@...gutronix.de>,
	Kevin Hilman <khilman@...nel.org>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-mediatek@...ts.infradead.org>,
	Shunli Wang <shunli.wang@...iatek.com>
Subject: Re: [PATCH 4/4] soc: mediatek: Add MT2701/MT7623 scpsys driver



On 30/12/15 11:18, James Liao wrote:
> Hi Daniel,
>
> 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.

Best regards,
Matthias
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