From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38F29C3279B for ; Mon, 2 Jul 2018 10:18:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E4DEB24A35 for ; Mon, 2 Jul 2018 10:18:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E4DEB24A35 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965297AbeGBKSu (ORCPT ); Mon, 2 Jul 2018 06:18:50 -0400 Received: from mga03.intel.com ([134.134.136.65]:52421 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753807AbeGBKSq (ORCPT ); Mon, 2 Jul 2018 06:18:46 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Jul 2018 03:18:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,298,1526367600"; d="scan'208";a="242298111" Received: from smile.fi.intel.com (HELO smile) ([10.237.72.86]) by fmsmga006.fm.intel.com with ESMTP; 02 Jul 2018 03:18:43 -0700 Message-ID: Subject: Re: [PATCH 0/2] serial: 8250_dw: add fractional divisor support From: Andy Shevchenko To: Jisheng Zhang , Greg Kroah-Hartman , Jiri Slaby Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Date: Mon, 02 Jul 2018 13:18:42 +0300 In-Reply-To: <20180702180428.331b36c5@xhacker.debian> References: <20180702180428.331b36c5@xhacker.debian> Organization: Intel Finland Oy Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.1-2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2018-07-02 at 18:04 +0800, Jisheng Zhang wrote: > For Synopsys DesignWare 8250 uart which version >= 4.00a, there's a > valid divisor latch fraction register. The fractional divisor width is > 4bits ~ 6bits. > There are several serial IPs that have fractional divider built-in. None is using any specific hooks. Why do you need in your case, esp. taking into consideration that we have a custom ->set_termios() callback? > patch1 introduces necessary hooks to 8250 core. > patch2 implement the fractional divisor support for Synopsys DW 8250. > > Jisheng Zhang (2): > serial: 8250: introduce get_divisor() and set_divisor() hook > serial: 8250_dw: add fractional divisor support > > drivers/tty/serial/8250/8250_core.c | 4 +++ > drivers/tty/serial/8250/8250_dw.c | 54 > +++++++++++++++++++++++++++++ > drivers/tty/serial/8250/8250_port.c | 8 +++++ > include/linux/serial_8250.h | 7 ++++ > 4 files changed, 73 insertions(+) > -- Andy Shevchenko Intel Finland Oy