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Fri, 30 Oct 2026 04:38:11 -0700 (PDT) Received: from debian ([169.211.140.146]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8a9ea4865c8sm679545b3a.0.2026.10.30.04.38.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 04:38:10 -0700 (PDT) Date: Fri, 30 Oct 2026 07:37:54 -0400 From: Kwanghoon Son To: Conor Dooley Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Miguel Ojeda , Boqun Feng , Gary Guo , =?iso-8859-1?Q?Bj=F6rn?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , Onur =?iso-8859-1?Q?=D6zkan?= , Thomas Gleixner , Radu Rendec , Paul Walmsley , Samuel Holland , Palmer Dabbelt , Daniel Lezcano , Anup Patel , Albert Ou , Alexandre Ghiti , Greg Kroah-Hartman , Jiri Slaby , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, Paul Walmsley , linux-riscv@lists.infradead.org, linux-serial@vger.kernel.org Subject: Re: [PATCH RFC 10/12] riscv: dts: bouffalolab: Add Sipeed M1s Dock Message-ID: References: <20261029-rust-bl808-console-v1-0-b736ee920078@gmail.com> <20261029-rust-bl808-console-v1-10-b736ee920078@gmail.com> <20261029-pork-resonant-fb692b84bef7@spud> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261029-pork-resonant-fb692b84bef7@spud> 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 > > --- > > 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 > >