Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752643AbdHHP62 (ORCPT ); Tue, 8 Aug 2017 11:58:28 -0400 Received: from gloria.sntech.de ([95.129.55.99]:40036 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752461AbdHHP6Z (ORCPT ); Tue, 8 Aug 2017 11:58:25 -0400 From: Heiko Stuebner To: Elaine Zhang Cc: mturquette@baylibre.com, sboyd@codeaurora.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, huangtao@rock-chips.com, cl@rock-chips.com, xxx@rock-chips.com, xf@rock-chips.com Subject: Re: [PATCH 1/2] clk: fractional-divider: allow overriding of approximation Date: Tue, 08 Aug 2017 17:58:22 +0200 Message-ID: <1694589.HBVVhCKeO5@phil> User-Agent: KMail/5.2.3 (Linux/4.9.0-2-amd64; KDE/5.28.0; x86_64; ; ) In-Reply-To: <5453089.AIzWDZk3ey@phil> References: <1500624187-12165-1-git-send-email-zhangqing@rock-chips.com> <5990882.df1suBpf8V@phil> <5453089.AIzWDZk3ey@phil> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 597 Lines: 18 Am Dienstag, 1. August 2017, 18:21:22 CEST schrieb Heiko Stuebner: > From: Elaine Zhang > > Fractional dividers may have special requirements concerning numerator > and denominator selection that differ from just getting the best > approximation. > > For example on Rockchip socs the denominator must be at least 20 times > larger than the numerator to generate precise clock frequencies. > > Therefore add the ability to provide custom approximation functions. > > Signed-off-by: Elaine Zhang applied for 4.14 with Stephen's Ack Heiko