linux-kernel - Re: [RFC PATCH v2 10/11] riscv: soc: Add Allwinner SoC kconfig option

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Date:   Mon, 7 Jun 2021 09:27:19 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Guo Ren <guoren@...nel.org>, Anup Patel <anup.patel@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Drew Fustini <drew@...gleboard.org>, liush@...winnertech.com,
        lazyparser@...il.com, wefu@...hat.com,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-sunxi@...ts.linux.dev, Guo Ren <guoren@...ux.alibaba.com>,
        Atish Patra <atish.patra@....com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [RFC PATCH v2 10/11] riscv: soc: Add Allwinner SoC kconfig option

On Mon, Jun 7, 2021 at 9:20 AM Maxime Ripard <maxime@...no.tech> wrote:
> On Sun, Jun 06, 2021 at 09:04:08AM +0000, guoren@...nel.org wrote:

> > diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
> > index ed96376..055fb3e 100644
> > --- a/arch/riscv/Kconfig.socs
> > +++ b/arch/riscv/Kconfig.socs
> > @@ -69,4 +69,16 @@ config SOC_CANAAN_K210_DTB_SOURCE
> >
> >  endif
> >
> > +config SOC_SUNXI
> > +     bool "Allwinner SoCs"
> > +     depends on MMU
> > +     select DWMAC_GENERIC
> > +     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.
> > +
>
> We probably don't want to select DWMAC, STMMAC_ETH and the 8250 options,
> looks good otherwise.

Correct: those subsystems may be completely disabled, which would lead to a
build failure, and a platform should not force-enable drivers or
subsystems unless
those are build time dependencies.

       Arnd