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Wysocki" , Robert Moore , acpica-devel@lists.linux.dev, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/3] ACPI: SPCR: Add support for rev 3 Message-ID: References: <20240912173901.3969597-1-rrangel@chromium.org> <20240912113616.3.I1b7a5033a2191cb0cdbadc2d51666a97f16cc663@changeid> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240912113616.3.I1b7a5033a2191cb0cdbadc2d51666a97f16cc663@changeid> On Thu 2024-09-12 11:36:21, Raul E Rangel wrote: > Revision 3 supports specifying the UART input clock. This allows for > proper computation of the UART divisor when the baud rate is specified. > > The earlycon code can accept the following format (See `parse_options` > in `earlycon.c`.): > * ,io|mmio|mmio32|mmio32be,,,, > > This change makes it so the uartclk is passed along if it's defined in > the SPCR table. > > Booting with `earlycon` and a SPCR v3 table that has the uartclk and > baud defined: > [ 0.028251] ACPI: SPCR: console: uart,mmio32,0xfedc9000,115200,48000000 > [ 0.028267] earlycon: uart0 at MMIO32 0x00000000fedc9000 (options '115200,48000000') > [ 0.028272] printk: legacy bootconsole [uart0] enabled > > Link: https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table > > Signed-off-by: Raul E Rangel Looks good to me: Reviewed-by: Petr Mladek Best Regards, Petr