From patchwork Tue Apr 22 11:01:21 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 4030741 Return-Path: X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 8A83D9F391 for ; Tue, 22 Apr 2014 11:02:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A20F220221 for ; Tue, 22 Apr 2014 11:02:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8C57320204 for ; Tue, 22 Apr 2014 11:02:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755671AbaDVLCT (ORCPT ); Tue, 22 Apr 2014 07:02:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:2182 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755459AbaDVLCS (ORCPT ); Tue, 22 Apr 2014 07:02:18 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s3MB1jSm000988 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 22 Apr 2014 07:01:45 -0400 Received: from shalem.localdomain.com (vpn1-7-194.ams2.redhat.com [10.36.7.194]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s3MB1ct1019595; Tue, 22 Apr 2014 07:01:42 -0400 From: Hans de Goede To: Chris Ball , Ulf Hansson , Emilio Lopez , Mike Turquette Cc: =?UTF-8?q?David=20Lanzend=C3=B6rfer?= , Maxime Ripard , linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree , linux-sunxi@googlegroups.com, Hans de Goede Subject: [PATCH v8 01/17] clk: sunxi: factors: automatic reparenting support Date: Tue, 22 Apr 2014 13:01:21 +0200 Message-Id: <1398164497-14212-2-git-send-email-hdegoede@redhat.com> In-Reply-To: <1398164497-14212-1-git-send-email-hdegoede@redhat.com> References: <1398164497-14212-1-git-send-email-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Emilio López This commit implements .determine_rate, so that our factor clocks can be reparented when needed. Signed-off-by: Emilio López Signed-off-by: Hans de Goede --- drivers/clk/sunxi/clk-factors.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c index 9e23264..3806d97 100644 --- a/drivers/clk/sunxi/clk-factors.c +++ b/drivers/clk/sunxi/clk-factors.c @@ -77,6 +77,41 @@ static long clk_factors_round_rate(struct clk_hw *hw, unsigned long rate, return rate; } +static long clk_factors_determine_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *best_parent_rate, + struct clk **best_parent_p) +{ + struct clk *clk = hw->clk, *parent, *best_parent = NULL; + int i, num_parents; + unsigned long parent_rate, best = 0, child_rate, best_child_rate = 0; + + /* find the parent that can help provide the fastest rate <= rate */ + num_parents = __clk_get_num_parents(clk); + for (i = 0; i < num_parents; i++) { + parent = clk_get_parent_by_index(clk, i); + if (!parent) + continue; + if (__clk_get_flags(clk) & CLK_SET_RATE_PARENT) + parent_rate = __clk_round_rate(parent, rate); + else + parent_rate = __clk_get_rate(parent); + + child_rate = clk_factors_round_rate(hw, rate, &parent_rate); + + if (child_rate <= rate && child_rate > best_child_rate) { + best_parent = parent; + best = parent_rate; + best_child_rate = child_rate; + } + } + + if (best_parent) + *best_parent_p = best_parent; + *best_parent_rate = best; + + return best_child_rate; +} + static int clk_factors_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { @@ -113,6 +148,7 @@ static int clk_factors_set_rate(struct clk_hw *hw, unsigned long rate, } const struct clk_ops clk_factors_ops = { + .determine_rate = clk_factors_determine_rate, .recalc_rate = clk_factors_recalc_rate, .round_rate = clk_factors_round_rate, .set_rate = clk_factors_set_rate,