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

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Message-ID: <CAJF2gTTVj2J6_rCXAG81PB3vJZO2TTwpD03vAE2q+K=9zh_TzQ@mail.gmail.com>
Date:   Tue, 14 Sep 2021 10:34:52 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>, Arnd Bergmann <arnd@...db.de>
Cc:     Maxime Ripard <maxime@...no.tech>, 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 Tue, Sep 14, 2021 at 2:49 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> On 9/13/21 2:20 AM, Guo Ren wrote:
> > 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.
>
> Agreed, using a defconfig is the right way to do this.
Put 8250 related configs into arch/riscv/configs/defconfig?

 @Palmer Dabbelt @Arnd Bergmann, How do you think about that?
(defconfig or Kconfig.soc)
My purpose is when people make the Image from riscv/defconfig, then
the Image could run on all platforms include D1.

>
> --
> ~Randy
>


-- 
Best Regards
 Guo Ren

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