linux-kernel - Re: [RFC PATCH V4 6/6] riscv: soc: Add Allwinner SoC kconfig option

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Date:   Tue, 14 Sep 2021 10:26:28 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Maxime Ripard <maxime@...no.tech>, guoren@...nel.org
Cc:     anup.patel@....com, atish.patra@....com, palmerdabbelt@...gle.com,
        christoph.muellner@...ll.eu, philipp.tomsich@...ll.eu, hch@....de,
        liush@...winnertech.com, wefu@...hat.com, lazyparser@...il.com,
        drew@...gleboard.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, taiten.peng@...onical.com,
        aniket.ponkshe@...onical.com, heinrich.schuchardt@...onical.com,
        gordan.markus@...onical.com, Guo Ren <guoren@...ux.alibaba.com>,
        Chen-Yu Tsai <wens@...e.org>
Subject: Re: [RFC PATCH V4 6/6] riscv: soc: Add Allwinner SoC kconfig option

On 13/09/2021 09:45, Maxime Ripard wrote:
> Hi,
> 
> On Sat, Sep 11, 2021 at 05:21:39PM +0800, guoren@...nel.org wrote:
>> From: Liu Shaohua <liush@...winnertech.com>
>>
>> Add Allwinner kconfig option which selects SoC specific and common
>> drivers that is required for this SoC.
>>
>> Allwinner D1 uses custom PTE attributes to solve non-coherency SOC
>> interconnect issues for dma synchronization, so we set the default
>> value when SOC_SUNXI selected.
>>
>> Signed-off-by: Liu Shaohua <liush@...winnertech.com>
>> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
>> Signed-off-by: Wei Fu <wefu@...hat.com>
>> Cc: Anup Patel <anup.patel@....com>
>> Cc: Atish Patra <atish.patra@....com>
>> Cc: Christoph Hellwig <hch@....de>
>> Cc: Chen-Yu Tsai <wens@...e.org>
>> Cc: Drew Fustini <drew@...gleboard.org>
>> Cc: Maxime Ripard <maxime@...no.tech>
>> Cc: Palmer Dabbelt <palmerdabbelt@...gle.com>
>> Cc: Wei Wu <lazyparser@...il.com>
>> ---
>>   arch/riscv/Kconfig.socs      | 15 +++++++++++++++
>>   arch/riscv/configs/defconfig |  1 +
>>   2 files changed, 16 insertions(+)
>>
>> diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
>> index 30676ebb16eb..8721c000ef23 100644
>> --- a/arch/riscv/Kconfig.socs
>> +++ b/arch/riscv/Kconfig.socs
>> @@ -70,4 +70,19 @@ config SOC_CANAAN_K210_DTB_SOURCE
>>   
>>   endif
>>   
>> +config SOC_SUNXI
>> +	bool "Allwinner SoCs"
>> +	depends on MMU
>> +	select DWMAC_GENERIC
>> +	select ERRATA_THEAD
>> +	select RISCV_DMA_NONCOHERENT
>> +	select RISCV_ERRATA_ALTERNATIVE
>> +	select SERIAL_8250
>> +	select SERIAL_8250_CONSOLE
>> +	select SERIAL_8250_DW
>> +	select SIFIVE_PLIC
>> +	select STMMAC_ETH
>> +	help
>> +	  This enables support for Allwinner SoC platforms like the D1.
>> +
> 
> I'm not sure we should select the drivers there. We could very well
> imagine a board without UART, or even more so without ethernet.

I could make a case for selecting the serial as it is probably the
console, however the ethernet is not necessary for operation and I
would prefer to see this removed.

I wonder if we should have a new Kconfig keyword of suggest which
marks drivers as suggested for a given SoC/board/platform.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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