From patchwork Thu Mar 14 09:31:04 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bill Huang X-Patchwork-Id: 15345 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id 5FFD623E64 for ; Thu, 14 Mar 2013 09:26:59 +0000 (UTC) Received: from mail-ve0-f175.google.com (mail-ve0-f175.google.com [209.85.128.175]) by fiordland.canonical.com (Postfix) with ESMTP id 132A1A18599 for ; Thu, 14 Mar 2013 09:26:58 +0000 (UTC) Received: by mail-ve0-f175.google.com with SMTP id cy12so1517852veb.34 for ; Thu, 14 Mar 2013 02:26:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:x-forwarded-to:x-forwarded-for:delivered-to:x-received :received-spf:x-pgp-universal:from:to:cc:subject:date:message-id :x-mailer:x-nvconfidentiality:mime-version:content-type :x-gm-message-state; bh=5cKEqVWR/xi5g1KeYQVGFd/6ZkUB9EDl4Bwfg3OtHC8=; b=isXHEyJr32pHISo8F0mb3MT6h4d+rtvgV0rNB0+6cSkOdoZtlyoX25/U9I/NeCxbsJ 5suvRdflGg6A8rAYZBTrA/9sxRzN9CBdefNYbfkZK4+4maDijLSOPt49tGDmZkB8xb3z HZxz+1VAX0VRbgpE9HxtHvlYZv1a4BcycLmF+PkYeR6DQ/Bj6PhZJu6FnZ+CYDZticMB XmTDfiRPQFe11rwk2I0vIzPMsfnhci/QfrrCLs+QXr0N2DVCETwA/JQhk2s9Hmr+7KeA 9+1nO/tFiMVrHXQDb+4h/mq5qXuD29avhj8sxRpeyGwCCTs4uYkztTbPcK1vK4tSctGH z0Yg== X-Received: by 10.52.18.148 with SMTP id w20mr679356vdd.8.1363253218515; Thu, 14 Mar 2013 02:26:58 -0700 (PDT) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.58.127.98 with SMTP id nf2csp61492veb; Thu, 14 Mar 2013 02:26:58 -0700 (PDT) X-Received: by 10.68.39.195 with SMTP id r3mr4031781pbk.53.1363253217541; Thu, 14 Mar 2013 02:26:57 -0700 (PDT) Received: from hqemgate04.nvidia.com (hqemgate04.nvidia.com. [216.228.121.35]) by mx.google.com with ESMTPS id qf10si3276982pbc.338.2013.03.14.02.26.56 (version=TLSv1 cipher=RC4-SHA bits=128/128); Thu, 14 Mar 2013 02:26:57 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of bilhuang@nvidia.com designates 216.228.121.35 as permitted sender) client-ip=216.228.121.35; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of bilhuang@nvidia.com designates 216.228.121.35 as permitted sender) smtp.mail=bilhuang@nvidia.com Received: from hqnvupgp07.nvidia.com (Not Verified[216.228.121.13]) by hqemgate04.nvidia.com id ; Thu, 14 Mar 2013 02:26:47 -0700 Received: from hqemhub01.nvidia.com ([172.17.108.22]) by hqnvupgp07.nvidia.com (PGP Universal service); Thu, 14 Mar 2013 02:26:50 -0700 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Thu, 14 Mar 2013 02:26:50 -0700 Received: from localhost.localdomain (172.20.144.16) by hqemhub01.nvidia.com (172.20.150.30) with Microsoft SMTP Server (TLS) id 8.3.298.1; Thu, 14 Mar 2013 02:26:49 -0700 From: Bill Huang To: , , , , CC: Bill Huang Subject: [RFC v2 1/1] clk: Add notifier support in clk_prepare/clk_unprepare Date: Thu, 14 Mar 2013 02:31:04 -0700 Message-ID: <1363253464-3200-1-git-send-email-bilhuang@nvidia.com> X-Mailer: git-send-email 1.7.9.5 X-NVConfidentiality: public MIME-Version: 1.0 X-Gm-Message-State: ALoCoQkO0AzSnbIJGbv8hhsYa2mJ/uZ328i+vIsVwb3ZV4n+ONxHZ5pmZj1383p3JuHPlYOWLqqp Add the below two notifier events so drivers which are interested in knowing the clock status can act accordingly. This is extremely useful in some of the DVFS (Dynamic Voltage Frequency Scaling) design. CLK_PREPARED CLK_UNPREPARED Signed-off-by: Bill Huang --- drivers/clk/clk.c | 3 +++ include/linux/clk.h | 2 ++ 2 files changed, 5 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index ed87b24..3292cec 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -550,6 +550,7 @@ void clk_unprepare(struct clk *clk) { mutex_lock(&prepare_lock); __clk_unprepare(clk); + __clk_notify(clk, CLK_UNPREPARED, clk->rate, clk->rate); mutex_unlock(&prepare_lock); } EXPORT_SYMBOL_GPL(clk_unprepare); @@ -598,6 +599,8 @@ int clk_prepare(struct clk *clk) mutex_lock(&prepare_lock); ret = __clk_prepare(clk); + if (!ret) + __clk_notify(clk, CLK_PREPARED, clk->rate, clk->rate); mutex_unlock(&prepare_lock); return ret; diff --git a/include/linux/clk.h b/include/linux/clk.h index b3ac22d..16c1d92 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -43,6 +43,8 @@ struct clk; #define PRE_RATE_CHANGE BIT(0) #define POST_RATE_CHANGE BIT(1) #define ABORT_RATE_CHANGE BIT(2) +#define CLK_PREPARED BIT(3) +#define CLK_UNPREPARED BIT(4) /** * struct clk_notifier - associate a clk with a notifier