From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Zhao Subject: [PATCH V4 01/14] clk: add helper functions clk_prepare_enable and clk_disable_unprepare Date: Tue, 15 Nov 2011 14:47:56 +0800 Message-ID: <1321339689-25256-2-git-send-email-richard.zhao@linaro.org> References: <1321339689-25256-1-git-send-email-richard.zhao@linaro.org> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1321339689-25256-1-git-send-email-richard.zhao@linaro.org> Sender: linux-mmc-owner@vger.kernel.org To: linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-mmc@vger.kernel.org, netdev@vger.kernel.org, linux-serial@vger.kernel.org Cc: linux@arm.linux.org.uk, amit.kucheria@canonical.com, kernel@pengutronix.de, ben-linux@fluff.org, cjb@laptop.org, alan@linux.intel.com, eric.miao@linaro.org, richard.zhao@linaro.org List-Id: linux-serial@vger.kernel.org It's for migrating to generic clk framework API. The helper functions help cases clk_enable/clk_disable is used in non-atomic context. For example, Call clk_enable in probe and clk_disable in remove. Signed-off-by: Richard Zhao --- include/linux/clk.h | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-) diff --git a/include/linux/clk.h b/include/linux/clk.h index 7213b52..b9d46fa 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -107,6 +107,28 @@ static inline void clk_unprepare(struct clk *clk) } #endif +/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */ +static inline int clk_prepare_enable(struct clk *clk) +{ + int ret; + + ret = clk_prepare(clk); + if (ret) + return ret; + ret = clk_enable(clk); + if (ret) + clk_unprepare(clk); + + return ret; +} + +/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */ +static inline void clk_disable_unprepare(struct clk *clk) +{ + clk_disable(clk); + clk_unprepare(clk); +} + /** * clk_get_rate - obtain the current clock rate (in Hz) for a clock source. * This is only valid once the clock source has been enabled. -- 1.7.5.4