[RFC PATCH V4 6/6] riscv: soc: Add Allwinner SoC kconfig option

[Ben Dooks]

On 13/09/2021 09:45, Maxime Ripard wrote:
> Hi,
> 
> On Sat, Sep 11, 2021 at 05:21:39PM +0800, guoren at kernel.org wrote:
>> From: Liu Shaohua <liush at allwinnertech.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 at allwinnertech.com>
>> Signed-off-by: Guo Ren <guoren at linux.alibaba.com>
>> Signed-off-by: Wei Fu <wefu at redhat.com>
>> Cc: Anup Patel <anup.patel at wdc.com>
>> Cc: Atish Patra <atish.patra at wdc.com>
>> Cc: Christoph Hellwig <hch at lst.de>
>> Cc: Chen-Yu Tsai <wens at csie.org>
>> Cc: Drew Fustini <drew at beagleboard.org>
>> Cc: Maxime Ripard <maxime at cerno.tech>
>> Cc: Palmer Dabbelt <palmerdabbelt at google.com>
>> Cc: Wei Wu <lazyparser at gmail.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

https://www.codethink.co.uk/privacy.html