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2048-bit rsa key) header.d=1e100.net header.i=@1e100.net header.b=QIUAHCik; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=gmail.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751381AbeCNKf5 (ORCPT ); Wed, 14 Mar 2018 06:35:57 -0400 Received: from mail-qk0-f193.google.com ([209.85.220.193]:33762 "EHLO mail-qk0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751372AbeCNKf4 (ORCPT ); Wed, 14 Mar 2018 06:35:56 -0400 X-Google-Smtp-Source: AG47ELvaN5OO/IplZOYUOtsznjQsJecC9h6QUCcocB/6GeaNE5Jg03qEhoESog/xBID9XK5mIMr+zj+DQBzlBWe4pYw= MIME-Version: 1.0 In-Reply-To: <20180314003655.12141-2-djkurtz@chromium.org> References: <20180314003655.12141-1-djkurtz@chromium.org> <20180314003655.12141-2-djkurtz@chromium.org> From: Andy Shevchenko Date: Wed, 14 Mar 2018 12:35:55 +0200 Message-ID: Subject: Re: [PATCH 1/3] serial: 8250_early: Add earlycon support for AMD Carrizo / Stoneyridge To: Daniel Kurtz Cc: Aaron Durbin , Greg Kroah-Hartman , Jiri Slaby , Marc Gonzalez , Douglas Anderson , Matt Redfearn , Jeffy Chen , "open list:SERIAL DRIVERS" , open list Content-Type: text/plain; charset="UTF-8" Sender: linux-serial-owner@vger.kernel.org X-Mailing-List: linux-serial@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Wed, Mar 14, 2018 at 2:36 AM, Daniel Kurtz wrote: > AMD Carrizo / Stoneyridge use a DesignWare 8250 UART that uses a 48 MHz > input clock. > > Allow these platforms to set up this clock by specifying a kernel command > line like: > earlycon=amdcz,mmio32,0xfedc6000,115200 > Thanks, this is what I meant. Reviewed-by: Andy Shevchenko Suggested-by: ? > Signed-off-by: Daniel Kurtz > --- > drivers/tty/serial/8250/8250_early.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > > diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c > index ae6a256524d8..c6bf971a6038 100644 > --- a/drivers/tty/serial/8250/8250_early.c > +++ b/drivers/tty/serial/8250/8250_early.c > @@ -195,3 +195,18 @@ static int __init early_au_setup(struct earlycon_device *dev, const char *opt) > OF_EARLYCON_DECLARE(palmchip, "ralink,rt2880-uart", early_au_setup); > > #endif > + > +#ifdef CONFIG_SERIAL_8250_DW > +static int __init early_amdcz_setup(struct earlycon_device *dev, > + const char *opt) > +{ > + struct uart_port *port = &dev->port; > + > + port->uartclk = 48000000; > + > + return early_serial8250_setup(dev, opt); > +} > + > +EARLYCON_DECLARE(amdcz, early_amdcz_setup); > + > +#endif > -- > 2.16.2.804.g6dcf76e118-goog > -- With Best Regards, Andy Shevchenko