Re: [PATCH RFC 10/12] riscv: dts: bouffalolab: Add Sipeed M1s Dock

[Kwanghoon Son <asdfkwang@gmail.com>]

On Thu, Oct 29, 2026 at 07:07:00PM +0000, Conor Dooley wrote:
> On Thu, Oct 29, 2026 at 01:05:51AM -0400, Kwanghoon Son wrote:
> > Add the M1s SoM memory and 40 MHz crystal, and enable UART3 on the Dock
> > with a direct stdout path and 115200 8N1 settings.
> > 
> > Boot firmware initializes PSRAM, UART pads and shared PLLs. The tested
> > firmware configures D0 TIME at 320 MHz / 380, represented as 842105 Hz.
> > Firmware using another timer configuration must fix up timebase-
> > frequency. The declared 64 MiB PSRAM range must retain firmware
> > reservations or be narrowed by firmware when memory is assigned to
> > another core.
> > 
> > The stdout path selects the native polling printk console; userspace TTY
> > I/O is deferred.
> > 
> > Signed-off-by: Kwanghoon Son <asdfkwang@gmail.com>
> > ---
> >  arch/riscv/boot/dts/Makefile                          |  1 +
> >  arch/riscv/boot/dts/bouffalolab/Makefile              |  2 ++
> >  .../boot/dts/bouffalolab/bl808-sipeed-m1s-dock.dts    | 18 ++++++++++++++++++
> >  arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dtsi | 19 +++++++++++++++++++
> >  4 files changed, 40 insertions(+)
> > 
> > diff --git a/arch/riscv/boot/dts/Makefile b/arch/riscv/boot/dts/Makefile
> > index 69d8751fb17c803f0efb8003e111ee24144c222b..294f9c119f8f1d608c878ca1f95891843301f07e 100644
> > --- a/arch/riscv/boot/dts/Makefile
> > +++ b/arch/riscv/boot/dts/Makefile
> > @@ -2,6 +2,7 @@
> >  subdir-y += allwinner
> >  subdir-y += andes
> >  subdir-y += anlogic
> > +subdir-y += bouffalolab
> >  subdir-y += canaan
> >  subdir-y += eswin
> >  subdir-y += microchip
> > diff --git a/arch/riscv/boot/dts/bouffalolab/Makefile b/arch/riscv/boot/dts/bouffalolab/Makefile
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..4d63365edc095fbe9df31c4b12e29c4b624cbd1f
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/bouffalolab/Makefile
> > @@ -0,0 +1,2 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +dtb-$(CONFIG_ARCH_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 0000000000000000000000000000000000000000..c719a53c6e2de45f3718b48ba2116e99c70e559b
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s-dock.dts
> > @@ -0,0 +1,18 @@
> > +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> > +
> > +/dts-v1/;
> > +
> > +#include "bl808-sipeed-m1s.dtsi"
> > +
> > +/ {
> > +	model = "Sipeed M1s Dock";
> > +	compatible = "sipeed,m1s-dock", "sipeed,m1s", "bflb,bl808";
> > +
> > +	chosen {
> > +		stdout-path = "/soc/serial@30002000:115200n8";
> 
> You should be able to do this normally, with an alias. Why are you not
> just using what Jisheng did?

Because rust does NOT have alias OF yet.
I intended to post the Rust OF alias helper separately after this RFC.
But if this way wrong, I would patch for rust OF alias together.

> 
> > +	};
> > +};
> > +
> > +&uart3 {
> > +	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 0000000000000000000000000000000000000000..ae54e6e301ed2c5a1448d52c530c5074515ee38c
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dtsi
> > @@ -0,0 +1,19 @@
> > +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> > +
> > +#include "bl808.dtsi"
> > +
> > +/ {
> > +	compatible = "sipeed,m1s", "bflb,bl808";
> > +	memory@50000000 {
> > +		device_type = "memory";
> > +		reg = <0x50000000 0x04000000>;
> > +	};
> > +
> > +	cpus {
> > +		timebase-frequency = <842105>;
> > +	};
> > +};
> > +
> > +&xtal {
> > +	clock-frequency = <40000000>;
> > +};
> > 
> > -- 
> > 2.47.3
> >