From patchwork Tue Jan 29 06:10:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Boyd X-Patchwork-Id: 10785495 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CDD7291E for ; Tue, 29 Jan 2019 06:10:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BD2E32B62D for ; Tue, 29 Jan 2019 06:10:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B148A2B62B; Tue, 29 Jan 2019 06:10:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F155A2B663 for ; Tue, 29 Jan 2019 06:10:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727446AbfA2GK0 (ORCPT ); Tue, 29 Jan 2019 01:10:26 -0500 Received: from mail.kernel.org ([198.145.29.99]:33440 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726799AbfA2GKZ (ORCPT ); Tue, 29 Jan 2019 01:10:25 -0500 Received: from mail.kernel.org (unknown [104.132.0.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E9D9921848; Tue, 29 Jan 2019 06:10:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548742224; bh=xpJjqVk08G7KRA5XNG0b5SrlCMynjA4/zEzEaDe3N0I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZJC2IYe+v9rw/dx+ZZJFMyshaWLsNA1RnJPBoqxD7sxTSgkoGKoCRLE3V6e0h8VOY Gr762PUjpraoCaHrnIYWVXWtxRcK0RySv+/XtbRiuWS02iplISuK1ZVY8DI21zrNFy mP4oQPSChkRMFXy5YmGzMu4PUnbXy3fcWXqCHlmI= From: Stephen Boyd To: Michael Turquette , Stephen Boyd Cc: linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, Miquel Raynal , Jerome Brunet , Russell King Subject: [PATCH 4/9] clk: Introduce of_clk_get_hw_from_clkspec() Date: Mon, 28 Jan 2019 22:10:16 -0800 Message-Id: <20190129061021.94775-5-sboyd@kernel.org> X-Mailer: git-send-email 2.20.1.495.gaa96b0ce6b-goog In-Reply-To: <20190129061021.94775-1-sboyd@kernel.org> References: <20190129061021.94775-1-sboyd@kernel.org> MIME-Version: 1.0 Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We want to get struct clk_hw pointers from a DT clk specifier (i.e. a clocks property) so that we can find parent clks without searching for globally unique clk names. This should save time by avoiding the global string search for clks that are external to the clock controller providing the clk and let us move away from string comparisons in general. Introduce of_clk_get_hw_from_clkspec() which is largely the DT parsing part of finding clks implemented in clkdev.c and have that return a clk_hw pointer instead of converting that into a clk pointer. This lets us push up the clk pointer creation to the caller in clk_get() and avoids the need to push the dev_id and con_id throughout the DT parsing code. Cc: Miquel Raynal Cc: Jerome Brunet Cc: Russell King Cc: Michael Turquette Signed-off-by: Stephen Boyd --- drivers/clk/clk.c | 46 +++++++++++++++++++++--- drivers/clk/clk.h | 5 +-- drivers/clk/clkdev.c | 83 +++++++++++++------------------------------- 3 files changed, 69 insertions(+), 65 deletions(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 01cdb9ae03fa..d4c4cab42375 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -4077,6 +4077,42 @@ void devm_of_clk_del_provider(struct device *dev) } EXPORT_SYMBOL(devm_of_clk_del_provider); +int of_parse_clkspec(const struct device_node *np, int index, const char *name, + struct of_phandle_args *out_args) +{ + int ret = -ENOENT; + + /* Walk up the tree of devices looking for a clock property that matches */ + while (np) { + /* + * For named clocks, first look up the name in the + * "clock-names" property. If it cannot be found, then index + * will be an error code and of_parse_phandle_with_args() will + * return -EINVAL. + */ + if (name) + index = of_property_match_string(np, "clock-names", name); + ret = of_parse_phandle_with_args(np, "clocks", "#clock-cells", + index, out_args); + if (!ret) + break; + if (name && index >= 0) + break; + + /* + * No matching clock found on this node. If the parent node + * has a "clock-ranges" property, then we can try one of its + * clocks. + */ + np = np->parent; + if (np && !of_get_property(np, "clock-ranges", NULL)) + break; + index = 0; + } + + return ret; +} + static struct clk_hw * __of_clk_get_hw_from_provider(struct of_clk_provider *provider, struct of_phandle_args *clkspec) @@ -4092,8 +4128,7 @@ __of_clk_get_hw_from_provider(struct of_clk_provider *provider, return __clk_get_hw(clk); } -struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec, - const char *dev_id, const char *con_id) +struct clk_hw *of_clk_get_hw_from_clkspec(struct of_phandle_args *clkspec) { struct of_clk_provider *provider; struct clk_hw *hw = ERR_PTR(-EPROBE_DEFER); @@ -4101,7 +4136,6 @@ struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec, if (!clkspec) return ERR_PTR(-EINVAL); - /* Check if we have such a provider in our array */ mutex_lock(&of_clk_mutex); list_for_each_entry(provider, &of_clk_providers, link) { if (provider->node == clkspec->np) { @@ -4112,7 +4146,7 @@ struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec, } mutex_unlock(&of_clk_mutex); - return clk_hw_create_clk(hw, dev_id, con_id); + return hw; } /** @@ -4125,7 +4159,9 @@ struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec, */ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec) { - return __of_clk_get_from_provider(clkspec, NULL, __func__); + struct clk_hw *hw = of_clk_get_hw_from_clkspec(clkspec); + + return clk_hw_create_clk(hw, NULL, __func__); } EXPORT_SYMBOL_GPL(of_clk_get_from_provider); diff --git a/drivers/clk/clk.h b/drivers/clk/clk.h index c9a14122fadc..cdac6dfa8094 100644 --- a/drivers/clk/clk.h +++ b/drivers/clk/clk.h @@ -12,8 +12,9 @@ struct clk_hw; #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) -struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec, - const char *dev_id, const char *con_id); +int of_parse_clkspec(const struct device_node *np, int index, const char *name, + struct of_phandle_args *out_args); +struct clk_hw *of_clk_get_hw_from_clkspec(struct of_phandle_args *clkspec); #endif #ifdef CONFIG_COMMON_CLK diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c index bdeaffc950ae..5ebb2119c0b9 100644 --- a/drivers/clk/clkdev.c +++ b/drivers/clk/clkdev.c @@ -28,69 +28,37 @@ static LIST_HEAD(clocks); static DEFINE_MUTEX(clocks_mutex); #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) -static struct clk *__of_clk_get(struct device_node *np, int index, - const char *dev_id, const char *con_id) +static struct clk_hw *of_clk_get_hw(struct device_node *np, + int index, const char *con_id) { + int ret; + struct clk_hw *hw; struct of_phandle_args clkspec; - struct clk *clk; - int rc; - rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index, - &clkspec); - if (rc) - return ERR_PTR(rc); + ret = of_parse_clkspec(np, index, con_id, &clkspec); + if (ret) + return ERR_PTR(ret); - clk = __of_clk_get_from_provider(&clkspec, dev_id, con_id); + hw = of_clk_get_hw_from_clkspec(&clkspec); of_node_put(clkspec.np); - return clk; + return hw; } -struct clk *of_clk_get(struct device_node *np, int index) +static struct clk *__of_clk_get(struct device_node *np, + int index, const char *dev_id, + const char *con_id) { - return __of_clk_get(np, index, np->full_name, NULL); + struct clk_hw *hw = of_clk_get_hw(np, index, con_id); + + return clk_hw_create_clk(hw, dev_id, con_id); } -EXPORT_SYMBOL(of_clk_get); -static struct clk *__of_clk_get_by_name(struct device_node *np, - const char *dev_id, - const char *name) +struct clk *of_clk_get(struct device_node *np, int index) { - struct clk *clk = ERR_PTR(-ENOENT); - - /* Walk up the tree of devices looking for a clock that matches */ - while (np) { - int index = 0; - - /* - * For named clocks, first look up the name in the - * "clock-names" property. If it cannot be found, then - * index will be an error code, and of_clk_get() will fail. - */ - if (name) - index = of_property_match_string(np, "clock-names", name); - clk = __of_clk_get(np, index, dev_id, name); - if (!IS_ERR(clk)) { - break; - } else if (name && index >= 0) { - if (PTR_ERR(clk) != -EPROBE_DEFER) - pr_err("ERROR: could not get clock %pOF:%s(%i)\n", - np, name ? name : "", index); - return clk; - } - - /* - * No matching clock found on this node. If the parent node - * has a "clock-ranges" property, then we can try one of its - * clocks. - */ - np = np->parent; - if (np && !of_get_property(np, "clock-ranges", NULL)) - break; - } - - return clk; + return __of_clk_get(np, index, np->full_name, NULL); } +EXPORT_SYMBOL(of_clk_get); /** * of_clk_get_by_name() - Parse and lookup a clock referenced by a device node @@ -106,15 +74,14 @@ struct clk *of_clk_get_by_name(struct device_node *np, const char *name) if (!np) return ERR_PTR(-ENOENT); - return __of_clk_get_by_name(np, np->full_name, name); + return __of_clk_get(np, -1, np->full_name, name); } EXPORT_SYMBOL(of_clk_get_by_name); #else /* defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) */ -static struct clk *__of_clk_get_by_name(struct device_node *np, - const char *dev_id, - const char *name) +static struct clk_hw *of_clk_get_hw(struct device_node *np, + int index, const char *con_id) { return ERR_PTR(-ENOENT); } @@ -187,12 +154,12 @@ EXPORT_SYMBOL(clk_get_sys); struct clk *clk_get(struct device *dev, const char *con_id) { const char *dev_id = dev ? dev_name(dev) : NULL; - struct clk *clk; + struct clk_hw *hw; if (dev && dev->of_node) { - clk = __of_clk_get_by_name(dev->of_node, dev_id, con_id); - if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER) - return clk; + hw = of_clk_get_hw(dev->of_node, 0, con_id); + if (!IS_ERR(hw) || PTR_ERR(hw) == -EPROBE_DEFER) + return clk_hw_create_clk(hw, dev_id, con_id); } return clk_get_sys(dev_id, con_id);