From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753301Ab2HaMWP (ORCPT ); Fri, 31 Aug 2012 08:22:15 -0400 Received: from eu1sys200aog119.obsmtp.com ([207.126.144.147]:60193 "EHLO eu1sys200aog119.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753051Ab2HaMWL (ORCPT ); Fri, 31 Aug 2012 08:22:11 -0400 From: Ulf Hansson To: , Mike Turquette , Mike Turquette , Samuel Ortiz , Cc: Linus Walleij , Lee Jones , Philippe Begnic , Srinidhi Kasagar , Ulf Hansson Subject: [PATCH 1/4] clk: Provide option for clk_get_rate to issue hw for new rate Date: Fri, 31 Aug 2012 14:21:28 +0200 Message-ID: <1346415691-13371-2-git-send-email-ulf.hansson@stericsson.com> X-Mailer: git-send-email 1.7.10 In-Reply-To: <1346415691-13371-1-git-send-email-ulf.hansson@stericsson.com> References: <1346415691-13371-1-git-send-email-ulf.hansson@stericsson.com> 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 From: Ulf Hansson By using CLK_GET_RATE_NOCACHE flag, we tell the clk_get_rate API to issue the hw for an updated clock rate. This can be used for a clock which rate may be updated without a client necessary modifying it. Signed-off-by: Ulf Hansson --- drivers/clk/clk.c | 43 +++++++++++++++++++++++------------------- include/linux/clk-provider.h | 1 + 2 files changed, 25 insertions(+), 19 deletions(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index efdfd00..d9cbae0 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -558,25 +558,6 @@ int clk_enable(struct clk *clk) EXPORT_SYMBOL_GPL(clk_enable); /** - * clk_get_rate - return the rate of clk - * @clk: the clk whose rate is being returned - * - * Simply returns the cached rate of the clk. Does not query the hardware. If - * clk is NULL then returns 0. - */ -unsigned long clk_get_rate(struct clk *clk) -{ - unsigned long rate; - - mutex_lock(&prepare_lock); - rate = __clk_get_rate(clk); - mutex_unlock(&prepare_lock); - - return rate; -} -EXPORT_SYMBOL_GPL(clk_get_rate); - -/** * __clk_round_rate - round the given rate for a clk * @clk: round the rate of this clock * @@ -702,6 +683,30 @@ static void __clk_recalc_rates(struct clk *clk, unsigned long msg) } /** + * clk_get_rate - return the rate of clk + * @clk: the clk whose rate is being returned + * + * Simply returns the cached rate of the clk, unless CLK_GET_RATE_NOCACHE flag + * is set, which means a recalc_rate will be issued. + * If clk is NULL then returns 0. + */ +unsigned long clk_get_rate(struct clk *clk) +{ + unsigned long rate; + + mutex_lock(&prepare_lock); + + if (clk && (clk->flags & CLK_GET_RATE_NOCACHE)) + __clk_recalc_rates(clk, 0); + + rate = __clk_get_rate(clk); + mutex_unlock(&prepare_lock); + + return rate; +} +EXPORT_SYMBOL_GPL(clk_get_rate); + +/** * __clk_speculate_rates * @clk: first clk in the subtree * @parent_rate: the "future" rate of clk's parent diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 77335fa..1b15307 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -26,6 +26,7 @@ #define CLK_IGNORE_UNUSED BIT(3) /* do not gate even if unused */ #define CLK_IS_ROOT BIT(4) /* root clk, has no parent */ #define CLK_IS_BASIC BIT(5) /* Basic clk, can't do a to_clk_foo() */ +#define CLK_GET_RATE_NOCACHE BIT(6) /* do not use the cached clk rate */ struct clk_hw; -- 1.7.10