From patchwork Thu Aug 1 15:03:45 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 2837105 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 069099F2B3 for ; Thu, 1 Aug 2013 15:04:20 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AAAF42035C for ; Thu, 1 Aug 2013 15:04:18 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 319E420357 for ; Thu, 1 Aug 2013 15:04:17 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V4uQJ-0005IJ-B6; Thu, 01 Aug 2013 15:04:15 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V4uQH-00040v-3c; Thu, 01 Aug 2013 15:04:13 +0000 Received: from 8.mo2.mail-out.ovh.net ([188.165.52.147] helo=mo2.mail-out.ovh.net) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V4uQE-0003z6-UU for linux-arm-kernel@lists.infradead.org; Thu, 01 Aug 2013 15:04:11 +0000 Received: from mail431.ha.ovh.net (gw6.ovh.net [213.251.189.206]) by mo2.mail-out.ovh.net (Postfix) with SMTP id F3FB8DC511D for ; Thu, 1 Aug 2013 17:03:49 +0200 (CEST) Received: from b0.ovh.net (HELO queueout) (213.186.33.50) by b0.ovh.net with SMTP; 1 Aug 2013 17:08:05 +0200 Received: from cha74-5-78-236-240-82.fbx.proxad.net (HELO localhost.localdomain) (b.brezillon@overkiz.com@78.236.240.82) by ns0.ovh.net with SMTP; 1 Aug 2013 17:08:03 +0200 From: Boris BREZILLON To: Mike Turquette , Russell King , Rob Landley , Rob Herring X-Ovh-Mailout: 178.32.228.2 (mo2.mail-out.ovh.net) Subject: [RFC PATCH 2/2] clk: add accuracy support for fixed clock Date: Thu, 1 Aug 2013 17:03:45 +0200 Message-Id: <1375369425-27982-1-git-send-email-b.brezillon@overkiz.com> X-Mailer: git-send-email 1.7.9.5 X-Ovh-Tracer-Id: 8778078625737963548 X-Ovh-Remote: 78.236.240.82 (cha74-5-78-236-240-82.fbx.proxad.net) X-Ovh-Local: 213.186.33.20 (ns0.ovh.net) X-OVH-SPAMSTATE: OK X-OVH-SPAMSCORE: -100 X-OVH-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeijedriedtucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-Spam-Check: DONE|U 0.5/N X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeijedriedtucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130801_110411_152794_D49C78FA X-CRM114-Status: GOOD ( 15.57 ) X-Spam-Score: -1.9 (-) Cc: devicetree@vger.kernel.org, Boris BREZILLON , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds support for accuracy retrieval on fixed clocks. It also adds a new dt property called 'clock-accuracy' to define the clock accuracy. This can be usefull for oscillator (RC, crystal, ...) definitions which are always given an accuracy characteristic. --- .../devicetree/bindings/clock/fixed-clock.txt | 3 ++ drivers/clk/clk-fixed-rate.c | 41 +++++++++++++++++--- include/linux/clk-provider.h | 3 ++ 3 files changed, 42 insertions(+), 5 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/fixed-clock.txt b/Documentation/devicetree/bindings/clock/fixed-clock.txt index 0b1fe78..48ea0ad 100644 --- a/Documentation/devicetree/bindings/clock/fixed-clock.txt +++ b/Documentation/devicetree/bindings/clock/fixed-clock.txt @@ -10,6 +10,8 @@ Required properties: - clock-frequency : frequency of clock in Hz. Should be a single cell. Optional properties: +- clock-accuracy : accuracy of clock in ppb (parts per billion). + Should be a single cell. - gpios : From common gpio binding; gpio connection to clock enable pin. - clock-output-names : From common clock binding. @@ -18,4 +20,5 @@ Example: compatible = "fixed-clock"; #clock-cells = <0>; clock-frequency = <1000000000>; + clock-accuracy = <100>; }; diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c index dc58fbd..f716bf3 100644 --- a/drivers/clk/clk-fixed-rate.c +++ b/drivers/clk/clk-fixed-rate.c @@ -34,22 +34,31 @@ static unsigned long clk_fixed_rate_recalc_rate(struct clk_hw *hw, return to_clk_fixed_rate(hw)->fixed_rate; } +static unsigned long clk_fixed_rate_recalc_accuracy(struct clk_hw *hw, + unsigned long parent_accuracy) +{ + return to_clk_fixed_rate(hw)->fixed_accuracy; +} + const struct clk_ops clk_fixed_rate_ops = { .recalc_rate = clk_fixed_rate_recalc_rate, + .recalc_accuracy = clk_fixed_rate_recalc_accuracy, }; EXPORT_SYMBOL_GPL(clk_fixed_rate_ops); /** - * clk_register_fixed_rate - register fixed-rate clock with the clock framework + * clk_register_fixed_rate_with_accuracy - register fixed-rate clock with the + * clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_name: name of clock's parent * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate + * @fixed_accuracy: non-adjustable clock rate */ -struct clk *clk_register_fixed_rate(struct device *dev, const char *name, - const char *parent_name, unsigned long flags, - unsigned long fixed_rate) +struct clk *clk_register_fixed_rate_with_accuracy(struct device *dev, + const char *name, const char *parent_name, unsigned long flags, + unsigned long fixed_rate, unsigned long fixed_accuracy) { struct clk_fixed_rate *fixed; struct clk *clk; @@ -70,6 +79,7 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name, /* struct clk_fixed_rate assignments */ fixed->fixed_rate = fixed_rate; + fixed->fixed_accuracy = fixed_accuracy; fixed->hw.init = &init; /* register the clock */ @@ -81,6 +91,22 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name, return clk; } +/** + * clk_register_fixed_rate - register fixed-rate clock with the clock framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_name: name of clock's parent + * @flags: framework-specific flags + * @fixed_rate: non-adjustable clock rate + */ +struct clk *clk_register_fixed_rate(struct device *dev, const char *name, + const char *parent_name, unsigned long flags, + unsigned long fixed_rate) +{ + return clk_register_fixed_rate_with_accuracy(dev, name, parent_name, + flags, fixed_rate, 0); +} + #ifdef CONFIG_OF /** * of_fixed_clk_setup() - Setup function for simple fixed rate clock @@ -90,13 +116,18 @@ void of_fixed_clk_setup(struct device_node *node) struct clk *clk; const char *clk_name = node->name; u32 rate; + u32 accuracy = 0; if (of_property_read_u32(node, "clock-frequency", &rate)) return; + of_property_read_u32(node, "clock-accuracy", &accuracy); + of_property_read_string(node, "clock-output-names", &clk_name); - clk = clk_register_fixed_rate(NULL, clk_name, NULL, CLK_IS_ROOT, rate); + clk = clk_register_fixed_rate_with_accuracy(NULL, clk_name, NULL, + CLK_IS_ROOT, rate, + accuracy); if (!IS_ERR(clk)) of_clk_add_provider(node, of_clk_src_simple_get, clk); } diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 2127fbc..b379e50 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -203,6 +203,9 @@ extern const struct clk_ops clk_fixed_rate_ops; struct clk *clk_register_fixed_rate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, unsigned long fixed_rate); +struct clk *clk_register_fixed_rate_with_accuracy(struct device *dev, + const char *name, const char *parent_name, unsigned long flags, + unsigned long fixed_rate, unsigned long fixed_accuracy); void of_fixed_clk_setup(struct device_node *np);