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

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Date:   Mon, 13 Sep 2021 17:20:25 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Anup Patel <anup.patel@....com>, Atish Patra <atish.patra@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Christoph Müllner <christoph.muellner@...ll.eu>,
        philipp.tomsich@...ll.eu, Christoph Hellwig <hch@....de>,
        liush <liush@...winnertech.com>, wefu@...hat.com,
        Wei Wu (吴伟) <lazyparser@...il.com>,
        Drew Fustini <drew@...gleboard.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <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 Mon, Sep 13, 2021 at 4:45 PM Maxime Ripard <maxime@...no.tech> 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.
We just want people could bring D1 up easier, 8250 is the basic component.


>
> These options should be in the defconfig.
>
> Maxime



--
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/