Date:   Mon, 05 Dec 2022 16:15:46 +0800
From:   Icenowy Zheng <uwu@...nowy.me>
To:     Samuel Holland <samuel@...lland.org>,
        Jisheng Zhang <jszhang@...nel.org>
Cc:     linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH v2 7/9] riscv: dts: bouffalolab: add Sipeed M1s SoM and
 Dock devicetree

在 2022-11-30星期三的 01:25 -0600，Samuel Holland写道：
> On 11/27/22 07:24, Jisheng Zhang wrote:
> > Sipeed manufactures a M1s system-on-module and dock board, add
> > basic
> > support for them.
> > 
> > Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> > ---
> >  arch/riscv/boot/dts/Makefile                  |  1 +
> >  arch/riscv/boot/dts/bouffalolab/Makefile      |  2 ++
> >  .../dts/bouffalolab/bl808-sipeed-m1s-dock.dts | 25
> > +++++++++++++++++++
> >  .../dts/bouffalolab/bl808-sipeed-m1s.dtsi     | 21
> > ++++++++++++++++
> >  4 files changed, 49 insertions(+)
> >  create mode 100644 arch/riscv/boot/dts/bouffalolab/Makefile
> >  create mode 100644 arch/riscv/boot/dts/bouffalolab/bl808-sipeed-
> > m1s-dock.dts
> >  create mode 100644 arch/riscv/boot/dts/bouffalolab/bl808-sipeed-
> > m1s.dtsi
> > 
> > diff --git a/arch/riscv/boot/dts/Makefile
> > b/arch/riscv/boot/dts/Makefile
> > index ff174996cdfd..b525467152b2 100644
> > --- a/arch/riscv/boot/dts/Makefile
> > +++ b/arch/riscv/boot/dts/Makefile
> > @@ -1,4 +1,5 @@
> >  # SPDX-License-Identifier: GPL-2.0
> > +subdir-y += bouffalolab
> >  subdir-y += sifive
> >  subdir-y += starfive
> >  subdir-$(CONFIG_SOC_CANAAN_K210_DTB_BUILTIN) += canaan
> > diff --git a/arch/riscv/boot/dts/bouffalolab/Makefile
> > b/arch/riscv/boot/dts/bouffalolab/Makefile
> > new file mode 100644
> > index 000000000000..5419964e892d
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/bouffalolab/Makefile
> > @@ -0,0 +1,2 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +dtb-$(CONFIG_SOC_BOUFFALOLAB) += bl808-sipeed-m1s-dock.dtb
> > diff --git a/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s-
> > dock.dts b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s-
> > dock.dts
> > new file mode 100644
> > index 000000000000..c6b4894a7b88
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s-dock.dts
> > @@ -0,0 +1,25 @@
> > +// SPDX-License-Identifier: (GPL-2.0+ or MIT)
> > +/*
> > + * Copyright (C) 2022 Jisheng Zhang <jszhang@...nel.org>
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "bl808-sipeed-m1s.dtsi"
> > +
> > +/ {
> > +       model = "Sipeed M1s Dock";
> > +       compatible = "sipeed,m1s-dock", "sipeed,m1s",
> > "bouffalolab,bl808";
> > +
> > +       aliases {
> > +               serial0 = &uart0;
> > +       };
> > +
> > +       chosen {
> > +               stdout-path = "serial0:2000000n8";
> > +       };
> > +};
> > +
> > +&uart0 {
> > +       status = "okay";
> > +};
> > diff --git a/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dtsi
> > b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dtsi
> > new file mode 100644
> > index 000000000000..5026de768534
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dtsi
> > @@ -0,0 +1,21 @@
> > +// SPDX-License-Identifier: (GPL-2.0+ or MIT)
> > +/*
> > + * Copyright (C) 2022 Jisheng Zhang <jszhang@...nel.org>
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "bl808.dtsi"
> > +
> > +/ {
> > +       compatible = "sipeed,m1s", "bouffalolab,bl808";
> > +
> > +       memory@...00000 {
> > +               device_type = "memory";
> > +               reg = <0x50000000 0x04000000>;
> > +       };
> 
> The PSRAM is part of the BL808, so this should go in the SoC .dtsi
> file.
> (Unless I'm missing something and there are BL808 variants with
> different amounts of memory. The PSRAM init code in the SDK does size
> detection, so I suppose it is possible.)

I think it really has variants.

> 
> Regards,
> Samuel
> 
> > +};
> > +
> > +&xtal {
> > +       clock-frequency = <40000000>;
> > +};
> 
> 
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