From patchwork Tue Apr 4 10:11:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 1764947 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-rtc-owner@vger.kernel.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=cerno.tech header.i=@cerno.tech header.a=rsa-sha256 header.s=fm3 header.b=B6jufhXd; dkim=pass (2048-bit key; unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.a=rsa-sha256 header.s=fm2 header.b=C2pPftA1; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4PrTN916c5z1yZT for ; Tue, 4 Apr 2023 23:37:45 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234493AbjDDNhn (ORCPT ); Tue, 4 Apr 2023 09:37:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51428 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234341AbjDDNhm (ORCPT ); Tue, 4 Apr 2023 09:37:42 -0400 Received: from new3-smtp.messagingengine.com (new3-smtp.messagingengine.com [66.111.4.229]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C58781AB; Tue, 4 Apr 2023 06:37:41 -0700 (PDT) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailnew.nyi.internal (Postfix) with ESMTP id D220E582196; Tue, 4 Apr 2023 09:37:40 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute1.internal (MEProxy); Tue, 04 Apr 2023 09:37:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cerno.tech; h=cc :cc:content-transfer-encoding:content-type:content-type:date :date:from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:sender:subject:subject:to:to; s=fm3; t= 1680615460; x=1680622660; bh=2b4Sgq/POkdhH5Bii8X9oCN5UjdHlAsPEu5 PVRDmJwc=; b=B6jufhXdIsIVVOlHteQmMsCMM/Z4+1u5ojL2vnpICtxMWNjcsfs 4+QZgjaeQVH0AzjR7Za7f4q7TIDO1jZRZrMfykFALSWqfkXqZd5daZAkJ2qeK16f XiHgwck908QWJphZLs5+ZOXpqdErNtIyIAgTTK4RCSw8arK/3DhPxHUa7UoQd9VB d9FAwyxWqJukdOz2NWneN1km0V64EEFj0pdLwr/ReGwxgJ6XRGtPLz3YLieZqtwP P5D269DYBISWMJVOkrvJcJlNHVFPh/uSdYZ0M0pb4t8gcFIl+1epjblVFJO4xrUn oByWVQKU46EPm1IK5EXe7dqILBUvPHIfm6w== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:content-type:date:date:feedback-id:feedback-id :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:sender:subject:subject:to:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; t= 1680615460; x=1680622660; bh=2b4Sgq/POkdhH5Bii8X9oCN5UjdHlAsPEu5 PVRDmJwc=; b=C2pPftA1A4975VJnNsrDC7upBY2VHAjKTnt9kEQa+N9kGujjUFK L3JmHcR1F65lOxPkmvrYbupmxqlWcxKYwrUkJBR502x5OfPVeXxKWSJwogoN2/Kq EEct3uQPL3dtMNMGPSlE5P1RvIuMNUt1usolNzd9bBcuBg+7cLC4WBtsrSNMHI50 xYz9N0oJOzRTIxw4vhliPAZlJk8NCUVJRKp8RG9h0JSAwUfMZdp/fik9gwkykwdq S3SjGbE7z2XnUXEk0/SvMQ4EWoH7TXjisfu2rgiqMV77i3BxXQbcmmUz9S/DXlo9 0NQNHXgJ+1cDApHq5Y1a3jd/2MIzG/FCIfw== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrvdeiledgieeiucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpeforgig ihhmvgcutfhiphgrrhguuceomhgrgihimhgvsegtvghrnhhordhtvggthheqnecuggftrf grthhtvghrnhepvedvleeijeegvdekffehkeehieelhfeggfffheetkeeuledvtdeuffeh teeltdffnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomh epmhgrgihimhgvsegtvghrnhhordhtvggthh X-ME-Proxy: Feedback-ID: i8771445c:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Tue, 4 Apr 2023 09:37:38 -0400 (EDT) From: Maxime Ripard Date: Tue, 04 Apr 2023 12:11:32 +0200 Subject: [PATCH v3 42/65] rtc: sun6i: Add a determine_rate hook MIME-Version: 1.0 Message-Id: <20221018-clk-range-checks-fixes-v3-42-9a1358472d52@cerno.tech> References: <20221018-clk-range-checks-fixes-v3-0-9a1358472d52@cerno.tech> In-Reply-To: <20221018-clk-range-checks-fixes-v3-0-9a1358472d52@cerno.tech> To: Michael Turquette , Stephen Boyd , =?utf-8?q?Andreas_F=C3=A4rber?= , Manivannan Sadhasivam , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , Max Filippov , Charles Keepax , Richard Fitzgerald , Maxime Coquelin , Alexandre Torgue , Luca Ceresoli , David Lechner , Sekhar Nori , Abel Vesa , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Matthias Brugger , Geert Uytterhoeven , Dinh Nguyen , Peter De Schrijver , Prashant Gaikwad , Thierry Reding , Jonathan Hunter , Ulf Hansson , Linus Walleij , David Airlie , Daniel Vetter , Vinod Koul , Kishon Vijay Abraham I , Alessandro Zummo , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Liam Girdwood , Mark Brown , Jaroslav Kysela , Takashi Iwai , Paul Cercueil , Orson Zhai , Baolin Wang , Chunyan Zhang Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, AngeloGioacchino Del Regno , linux-arm-kernel@lists.infradead.org, linux-actions@lists.infradead.org, patches@opensource.cirrus.com, linux-stm32@st-md-mailman.stormreply.com, linux-mediatek@lists.infradead.org, linux-renesas-soc@vger.kernel.org, linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-phy@lists.infradead.org, linux-rtc@vger.kernel.org, linux-sunxi@lists.linux.dev, alsa-devel@alsa-project.org, linux-mips@vger.kernel.org, Maxime Ripard X-Mailer: b4 0.12.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2340; i=maxime@cerno.tech; h=from:subject:message-id; bh=LBBJC9nnwlTM/0eok3kx3ph3T3adhOTLJf33evCrpDI=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDCna37e9M355yfi50i33zzFhzjv+vHQVePNf74Sx0JnNQiXH 57yV7ChlYRDjYpAVU2SJETZfEndq1utONr55MHNYmUCGMHBxCsBEpK8x/E+3mjxFlik77qjj7Koncu HBTJv+rT+6aPHum9w+YVdbq+8xMswO+uT19hpr9wOzCTJasQUGcmflL9/N3TtZY/VLt27XTm4A X-Developer-Key: i=maxime@cerno.tech; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-Spam-Status: No, score=0.2 required=5.0 tests=DATE_IN_PAST_03_06,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW,SPF_HELO_PASS, SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-rtc@vger.kernel.org The Allwinner sun6i RTC clock implements a mux with a set_parent hook, but doesn't provide a determine_rate implementation. This is a bit odd, since set_parent() is there to, as its name implies, change the parent of a clock. However, the most likely candidate to trigger that parent change is a call to clk_set_rate(), with determine_rate() figuring out which parent is the best suited for a given rate. The other trigger would be a call to clk_set_parent(), but it's far less used, and it doesn't look like there's any obvious user for that clock. So, the set_parent hook is effectively unused, possibly because of an oversight. However, it could also be an explicit decision by the original author to avoid any reparenting but through an explicit call to clk_set_parent(). The latter case would be equivalent to setting the flag CLK_SET_RATE_NO_REPARENT, together with setting our determine_rate hook to __clk_mux_determine_rate(). Indeed, if no determine_rate implementation is provided, clk_round_rate() (through clk_core_round_rate_nolock()) will call itself on the parent if CLK_SET_RATE_PARENT is set, and will not change the clock rate otherwise. __clk_mux_determine_rate() has the exact same behavior when CLK_SET_RATE_NO_REPARENT is set. And if it was an oversight, then we are at least explicit about our behavior now and it can be further refined down the line. Signed-off-by: Maxime Ripard --- drivers/rtc/rtc-sun6i.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c index dc76537f1b62..7d975202e0b9 100644 --- a/drivers/rtc/rtc-sun6i.c +++ b/drivers/rtc/rtc-sun6i.c @@ -214,6 +214,7 @@ static int sun6i_rtc_osc_set_parent(struct clk_hw *hw, u8 index) static const struct clk_ops sun6i_rtc_osc_ops = { .recalc_rate = sun6i_rtc_osc_recalc_rate, + .determine_rate = __clk_mux_determine_rate, .get_parent = sun6i_rtc_osc_get_parent, .set_parent = sun6i_rtc_osc_set_parent, @@ -227,6 +228,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node, struct clk_init_data init = { .ops = &sun6i_rtc_osc_ops, .name = "losc", + .flags = CLK_SET_RATE_NO_REPARENT, }; const char *iosc_name = "rtc-int-osc"; const char *clkout_name = "osc32k-out";