Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753192AbcDUWWL (ORCPT ); Thu, 21 Apr 2016 18:22:11 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:57477 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751679AbcDUWWH (ORCPT ); Thu, 21 Apr 2016 18:22:07 -0400 From: Stephen Boyd To: Michael Turquette , Stephen Boyd Cc: linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 02/13] clk: Add {devm_}clk_hw_{register,unregister}() APIs Date: Thu, 21 Apr 2016 15:21:53 -0700 Message-Id: <1461277324-27185-3-git-send-email-sboyd@codeaurora.org> X-Mailer: git-send-email 2.6.3.369.g91ad409 In-Reply-To: <1461277324-27185-1-git-send-email-sboyd@codeaurora.org> References: <1461277324-27185-1-git-send-email-sboyd@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6040 Lines: 186 We've largely split the clk consumer and provider APIs along struct clk and struct clk_hw, but clk_register() still returns a struct clk pointer for each struct clk_hw that's registered. Eventually we'd like to only allocate struct clks when there's a user, because struct clk is per-user now, so clk_register() needs to change. Let's add new APIs to register struct clk_hws, but this time we'll hide the struct clk from the caller by returning an int error code. Also add an unregistration API that takes the clk_hw structure that was passed to the registration API. This way provider drivers never have to deal with a struct clk pointer unless they're using the clk consumer APIs. Signed-off-by: Stephen Boyd --- Documentation/driver-model/devres.txt | 1 + drivers/clk/clk.c | 86 +++++++++++++++++++++++++++++++++++ include/linux/clk-provider.h | 6 +++ 3 files changed, 93 insertions(+) diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt index 73b98dfbcea4..108d45553e1b 100644 --- a/Documentation/driver-model/devres.txt +++ b/Documentation/driver-model/devres.txt @@ -236,6 +236,7 @@ certainly invest a bit more effort into libata core layer). CLOCK devm_clk_get() devm_clk_put() + devm_clk_hw_register() DMA dmam_alloc_coherent() diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index fb74dc1f7520..0ef919666827 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2536,6 +2536,22 @@ fail_out: } EXPORT_SYMBOL_GPL(clk_register); +/** + * clk_hw_register - register a clk_hw and return an error code + * @dev: device that is registering this clock + * @hw: link to hardware-specific clock data + * + * clk_hw_register is the primary interface for populating the clock tree with + * new clock nodes. It returns an integer equal to zero indicating success or + * less than zero indicating failure. Drivers must test for an error code after + * calling clk_hw_register(). + */ +int clk_hw_register(struct device *dev, struct clk_hw *hw) +{ + return PTR_ERR_OR_ZERO(clk_register(dev, hw)); +} +EXPORT_SYMBOL_GPL(clk_hw_register); + /* Free memory allocated for a clock. */ static void __clk_release(struct kref *ref) { @@ -2637,11 +2653,26 @@ unlock: } EXPORT_SYMBOL_GPL(clk_unregister); +/** + * clk_hw_unregister - unregister a currently registered clk_hw + * @hw: hardware-specific clock data to unregister + */ +void clk_hw_unregister(struct clk_hw *hw) +{ + clk_unregister(hw->clk); +} +EXPORT_SYMBOL_GPL(clk_hw_unregister); + static void devm_clk_release(struct device *dev, void *res) { clk_unregister(*(struct clk **)res); } +static void devm_clk_hw_release(struct device *dev, void *res) +{ + clk_hw_unregister(*(struct clk_hw **)res); +} + /** * devm_clk_register - resource managed clk_register() * @dev: device that is registering this clock @@ -2672,6 +2703,36 @@ struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw) } EXPORT_SYMBOL_GPL(devm_clk_register); +/** + * devm_clk_hw_register - resource managed clk_hw_register() + * @dev: device that is registering this clock + * @hw: link to hardware-specific clock data + * + * Managed clk_hw_register(). Clocks returned from this function are + * automatically clk_hw_unregister()ed on driver detach. See clk_hw_register() + * for more information. + */ +int devm_clk_hw_register(struct device *dev, struct clk_hw *hw) +{ + struct clk_hw **hwp; + int ret; + + hwp = devres_alloc(devm_clk_hw_release, sizeof(*hwp), GFP_KERNEL); + if (!hwp) + return -ENOMEM; + + ret = clk_hw_register(dev, hw); + if (!ret) { + *hwp = hw; + devres_add(dev, hwp); + } else { + devres_free(hwp); + } + + return ret; +} +EXPORT_SYMBOL_GPL(devm_clk_hw_register); + static int devm_clk_match(struct device *dev, void *res, void *data) { struct clk *c = res; @@ -2680,6 +2741,15 @@ static int devm_clk_match(struct device *dev, void *res, void *data) return c == data; } +static int devm_clk_hw_match(struct device *dev, void *res, void *data) +{ + struct clk_hw *hw = res; + + if (WARN_ON(!hw)) + return 0; + return hw == data; +} + /** * devm_clk_unregister - resource managed clk_unregister() * @clk: clock to unregister @@ -2694,6 +2764,22 @@ void devm_clk_unregister(struct device *dev, struct clk *clk) } EXPORT_SYMBOL_GPL(devm_clk_unregister); +/** + * devm_clk_hw_unregister - resource managed clk_hw_unregister() + * @dev: device that is unregistering the hardware-specific clock data + * @hw: link to hardware-specific clock data + * + * Unregister a clk_hw registered with devm_clk_hw_register(). Normally + * this function will not need to be called and the resource management + * code will ensure that the resource is freed. + */ +void devm_clk_hw_unregister(struct device *dev, struct clk_hw *hw) +{ + WARN_ON(devres_release(dev, devm_clk_hw_release, devm_clk_hw_match, + hw)); +} +EXPORT_SYMBOL_GPL(devm_clk_hw_unregister); + /* * clkdev helpers */ diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index da95258127aa..bc6c8de1fac1 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -655,9 +655,15 @@ struct clk *clk_register_gpio_mux(struct device *dev, const char *name, struct clk *clk_register(struct device *dev, struct clk_hw *hw); struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw); +int __must_check clk_hw_register(struct device *dev, struct clk_hw *hw); +int __must_check devm_clk_hw_register(struct device *dev, struct clk_hw *hw); + void clk_unregister(struct clk *clk); void devm_clk_unregister(struct device *dev, struct clk *clk); +void clk_hw_unregister(struct clk_hw *hw); +void devm_clk_hw_unregister(struct device *dev, struct clk_hw *hw); + /* helper functions */ const char *__clk_get_name(const struct clk *clk); const char *clk_hw_get_name(const struct clk_hw *hw); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project