linux-kernel - Re: [PATCH] i2c: I2C_HISI should depend on ARCH

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Date:   Thu, 15 Apr 2021 16:18:15 +0800
From:   Yicong Yang <yangyicong@...ilicon.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Wei Xu <xuwei5@...ilicon.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>
Subject: Re: [PATCH] i2c: I2C_HISI should depend on ARCH_HISI && ACPI

On 2021/4/15 2:06, Geert Uytterhoeven wrote:
> Hi Yicong,
> 
> On Wed, Apr 14, 2021 at 11:24 AM Yicong Yang <yangyicong@...ilicon.com> wrote:
>> On 2021/4/13 20:26, Geert Uytterhoeven wrote:
>>> The HiSilicon Kunpeng I2C controller is only present on HiSilicon
>>> Kunpeng SoCs, and its driver relies on ACPI to probe for its presence.
>>> Hence add dependencies on ARCH_HISI and ACPI, to prevent asking the user
>>> about this driver when configuring a kernel without Hisilicon platform
>>> or ACPI firmware support.
>>
>> this is a public IP which doesn't specifically depend on ARCH_HISI. I'm
>> not sure all the platform this IP on has ARCH_HISI configured. The driver
>> will not be compiled by default config. This is not correct to have
>> this dependence.
> 
> Thanks for your answer!
> 
> I guess it's still fine to add a dependency on ACPI?

yes. currently we only use this driver through ACPI. So at least
for this driver, it make sense to keep the dependency.

> 
> Thanks again!
> 
>>> Fixes: d62fbdb99a85730a ("i2c: add support for HiSilicon I2C controller")
>>> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>>> ---
>>>  drivers/i2c/busses/Kconfig | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>>> index b5b4e0d0ff4dd0bc..3ead6d9e130b2ebc 100644
>>> --- a/drivers/i2c/busses/Kconfig
>>> +++ b/drivers/i2c/busses/Kconfig
>>> @@ -647,7 +647,7 @@ config I2C_HIGHLANDER
>>>
>>>  config I2C_HISI
>>>       tristate "HiSilicon I2C controller"
>>> -     depends on ARM64 || COMPILE_TEST
>>> +     depends on (ARM64 && ARCH_HISI && ACPI) || COMPILE_TEST
>>>       help
>>>         Say Y here if you want to have Hisilicon I2C controller support
>>>         available on the Kunpeng Server.
> \
> Gr{oetje,eeting}s,
> 
>                         Geert
>