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=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_MUTT 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 42AB8C072B5 for ; Fri, 24 May 2019 13:48:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 143BF21855 for ; Fri, 24 May 2019 13:48:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b="U5RHUHJv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403902AbfEXNsz (ORCPT ); Fri, 24 May 2019 09:48:55 -0400 Received: from vps0.lunn.ch ([185.16.172.187]:55954 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2403809AbfEXNsz (ORCPT ); Fri, 24 May 2019 09:48:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=bdm8kgXmeh9EF5AOQiQM32qgv2w2u6Wxm0nFHm8Ro9c=; b=U5RHUHJv8X8iYT4p4utPOVNhvL lhdLXlGiQCfmCjjAY9dxWArxBVjjfujLqrStsr2yedxxLcj0jFAKfgD/X0tcLHU9IlaB6RDGwtK0D /bOWGRlOcgkkCMSayMDzT+wRgijnK+orwZQPUdmiYtOCG4LGlawmCc12+rvVFR1B1a44=; Received: from andrew by vps0.lunn.ch with local (Exim 4.89) (envelope-from ) id 1hUAYx-00019j-Ak; Fri, 24 May 2019 15:48:47 +0200 Date: Fri, 24 May 2019 15:48:47 +0200 From: Andrew Lunn To: Yash Shah Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, aou@eecs.berkeley.edu, netdev@vger.kernel.org, Palmer Dabbelt , linux-kernel@vger.kernel.org, nicolas.ferre@microchip.com, Sachin Ghadi , robh+dt@kernel.org, Paul Walmsley , ynezz@true.cz, linux-riscv@lists.infradead.org, davem@davemloft.net Subject: Re: [PATCH 2/2] net: macb: Add support for SiFive FU540-C000 Message-ID: <20190524134847.GF2979@lunn.ch> References: <1558611952-13295-1-git-send-email-yash.shah@sifive.com> <1558611952-13295-3-git-send-email-yash.shah@sifive.com> <20190523145417.GD19369@lunn.ch> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 24, 2019 at 10:22:06AM +0530, Yash Shah wrote: > On Thu, May 23, 2019 at 8:24 PM Andrew Lunn wrote: > > > > > +static int fu540_macb_tx_set_rate(struct clk_hw *hw, unsigned long rate, > > > + unsigned long parent_rate) > > > +{ > > > + rate = fu540_macb_tx_round_rate(hw, rate, &parent_rate); > > > + iowrite32(rate != 125000000, mgmt->reg); > > > > That looks odd. Writing the result of a comparison to a register? > > The idea was to write "1" to the register if the value of rate is > anything else than 125000000. I'm not a language lawyer. Is it guaranteed that an expression like this returns 1? Any value !0 is true, so maybe it actually returns 42? > To make it easier to read, I will change this to below: > - iowrite32(rate != 125000000, mgmt->reg); > + if (rate != 125000000) > + iowrite32(1, mgmt->reg); > + else > + iowrite32(0, mgmt->reg); > > Hope that's fine. Thanks for your comment Yes, that is good. Andrew