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Tue, 17 Mar 2026 06:59:35 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: AcMa5Labo19- Date: Tue, 17 Mar 2026 10:59:15 +0000 From: "Jiaxun Yang" To: "Rong Zhang" , "Greg Kroah-Hartman" , "Jiri Slaby" , "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" , "Thomas Bogendoerfer" , "Huacai Chen" Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, "linux-mips@vger.kernel.org" , devicetree@vger.kernel.org, "Yao Zi" , "Icenowy Zheng" , "Rong Zhang" Message-Id: In-Reply-To: <20260315184301.412844-1-rongrong@oss.cipunited.com> References: <20260315184301.412844-1-rongrong@oss.cipunited.com> Subject: Re: [PATCH v2 0/2] serial: 8250: loongson: Add support for MIPS-based Loongson 3A4000 Content-Type: text/plain Content-Transfer-Encoding: 7bit On Sun, 15 Mar 2026, at 6:42 PM, Rong Zhang wrote: > This series targets the serial tree. > > The UART controller on Loongson 3A4000 is compatible with Loongson > 2K1500, which is NS16550A-compatible with an additional fractional > frequency divisor register. > > Patch 1 adds loongson,ls3a4000-uart as compatible with > loongson,ls2k1500-uart. > > Patch 2 enables building 8250_loongson (loongson-uart) on MIPS > Loongson64. > > Tested on Loongson-LS3A4000-7A1000-NUC-SE with a 25MHz UART clock. > Without fractional frequency divisor, the actual baud rate was 111607 > (25MHz / 16 / 14, measured value: 111545) and some USB-to-UART > converters couldn't work with it at all. With fractional frequency > divisor, the measured baud rate becomes 115207, which is quite accurate. > > The patch for the MIPS tree to update the compatible strings in the > loongson64g-package DTS is sent separately, as it's independant of this > series and can be applied in any order (the compatible strings there > still contain "ns16550a", so no regression will be introduced). > > Changes in v2: > - Separated from v1 (patch 1,2): > https://lore.kernel.org/r/20260314234143.651298-1-rongrong@oss.cipunited.com/ > (thanks Krzysztof Kozlowski) For the series: Reviewed-by: Jiaxun Yang Thanks! > > Rong Zhang (2): > dt-bindings: serial: 8250: Add Loongson 3A4000 uart compatible > serial: 8250: loongson: Enable building on MIPS Loongson64 > > Documentation/devicetree/bindings/serial/8250.yaml | 1 + > drivers/tty/serial/8250/Kconfig | 9 +++++---- > 2 files changed, 6 insertions(+), 4 deletions(-) > > > base-commit: 267594792a71018788af69e836c52e34bb8054af > -- > 2.53.0 -- - Jiaxun