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=-8.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 203B1C282D9 for ; Thu, 31 Jan 2019 09:40:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EC9B2218D3 for ; Thu, 31 Jan 2019 09:40:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=verge.net.au header.i=@verge.net.au header.b="eKxVlS5t" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730742AbfAaJke (ORCPT ); Thu, 31 Jan 2019 04:40:34 -0500 Received: from kirsty.vergenet.net ([202.4.237.240]:59173 "EHLO kirsty.vergenet.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729232AbfAaJke (ORCPT ); Thu, 31 Jan 2019 04:40:34 -0500 Received: from reginn.horms.nl (watermunt.horms.nl [80.127.179.77]) by kirsty.vergenet.net (Postfix) with ESMTPA id 1BB8B25BEE3; Thu, 31 Jan 2019 20:40:25 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=verge.net.au; s=mail; t=1548927625; bh=6ehSh/qIHsVXBSM3aBJ3qx/+md3TG4zUP5FyQHutXjc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eKxVlS5tm2SUKR9u1fzpB5lg0QmCVuDfqe8uSyBXBD/Q9NvS0Czl2XnfZCaVGG8TS Rk/aSfTwFObqfhkaFKKMprTEZ0520FoNGHI034WgHt0pX51lIZ7jePK1XyuX0zAzUB fhLeyZeRdNjm+pLpFRuRiBaV6Csw70j3DYyNgRWA= Received: by reginn.horms.nl (Postfix, from userid 7100) id 3D0E1940480; Thu, 31 Jan 2019 10:40:23 +0100 (CET) From: Simon Horman To: Geert Uytterhoeven Cc: Magnus Damm , linux-renesas-soc@vger.kernel.org, linux-clk@vger.kernel.org, Fabrizio Castro , Biju Das , Simon Horman Subject: [PATCH v3 3/5] clk: renesas: rcar-gen3: Support Z and Z2 clocks with high frequency parents Date: Thu, 31 Jan 2019 10:40:19 +0100 Message-Id: <20190131094021.3092-4-horms+renesas@verge.net.au> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190131094021.3092-1-horms+renesas@verge.net.au> References: <20190131094021.3092-1-horms+renesas@verge.net.au> Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org Support Z and Z2 clocks with parent frequencies greater than UINT32_MAX Hz (~4.29GHz). The DIV_ROUND_CLOSEST_ULL() macro accepts a 64bit numerator and 32bit denominator. This leads to truncation of the numerator, which is the Z or Z2 parent clock frequency in HZ, on platforms where frequency of that clock is greater than UINT32_MAX Hz. To resolve this problem the DIV_ROUND_CLOSEST() macro, which accepts the prevailing types of the numerator and denominator, is used. In this case the type of the numerator is unsigned long long (64 bit) and the type of the denominator is unsigned long (64bit on 64bit platforms and 32bit on 32bit platforms). This allows parents whose frequency is greater than UINT32_MAX Hz on 64bit platforms. This appears to be sufficient as this driver is only intended for use on 64bit systems. And in particular, the motivation for this change is to allow a 4.8GHz clock on the R-Car Gen3 E3 (r8a77990) SoC which is a 64bit platform. Signed-off-by: Simon Horman --- v2: New patch --- drivers/clk/renesas/rcar-gen3-cpg.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/clk/renesas/rcar-gen3-cpg.c b/drivers/clk/renesas/rcar-gen3-cpg.c index 6b146c2cf6a3..236a7d9d94bd 100644 --- a/drivers/clk/renesas/rcar-gen3-cpg.c +++ b/drivers/clk/renesas/rcar-gen3-cpg.c @@ -120,8 +120,7 @@ static int cpg_z_clk_set_rate(struct clk_hw *hw, unsigned long rate, unsigned int i; u32 val, kick; - mult = DIV_ROUND_CLOSEST_ULL(rate * 32ULL * zclk->fixed_div, - parent_rate); + mult = DIV_ROUND_CLOSEST(rate * 32ULL * zclk->fixed_div, parent_rate); mult = clamp(mult, 1U, 32U); if (readl(zclk->kick_reg) & CPG_FRQCRB_KICK) -- 2.11.0