Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756029Ab3CNJ05 (ORCPT ); Thu, 14 Mar 2013 05:26:57 -0400 Received: from hqemgate04.nvidia.com ([216.228.121.35]:12144 "EHLO hqemgate04.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752477Ab3CNJ0z (ORCPT ); Thu, 14 Mar 2013 05:26:55 -0400 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Thu, 14 Mar 2013 02:26:50 -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 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1639 Lines: 55 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 -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/