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 A75C3C5CFEB for ; Wed, 11 Jul 2018 11:31:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C221208FA for ; Wed, 11 Jul 2018 11:31:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6C221208FA 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 S1733212AbeGKLfH (ORCPT ); Wed, 11 Jul 2018 07:35:07 -0400 Received: from mga06.intel.com ([134.134.136.31]:34311 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733198AbeGKLfH (ORCPT ); Wed, 11 Jul 2018 07:35:07 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Jul 2018 04:31:13 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,338,1526367600"; d="scan'208";a="71407871" Received: from smile.fi.intel.com (HELO smile) ([10.237.72.86]) by fmsmga001.fm.intel.com with ESMTP; 11 Jul 2018 04:31:04 -0700 Message-ID: <2b363dc2f8ddd6fe52ba6f7c461b4dd55cfb8bce.camel@linux.intel.com> Subject: Re: [PATCH v5 3/3] serial: 8250_dw: add fractional divisor support From: Andy Shevchenko To: Jisheng Zhang , Greg Kroah-Hartman , Jiri Slaby Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org Date: Wed, 11 Jul 2018 14:31:03 +0300 In-Reply-To: <20180711151111.6f417020@xhacker.debian> References: <20180710110942.5b0a016e@xhacker.debian> <20180710111516.13b8c570@xhacker.debian> <20180711151111.6f417020@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 Wed, 2018-07-11 at 15:11 +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. > > Now the preparation is done, it's easy to add the feature support. > This patch firstly tries to get the fractional divisor width during > probe, then setups dw specific get_divisor() and set_divisor() hook. > You would need to resend entire series as v6. Don't forget to add given tags. But, wait a bit, I would like to check the algo (thanks for C program!). -- Andy Shevchenko Intel Finland Oy