From patchwork Fri May 5 11:25:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13232508 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9458CC7EE26 for ; Fri, 5 May 2023 11:28:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231384AbjEEL2F (ORCPT ); Fri, 5 May 2023 07:28:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231313AbjEEL2D (ORCPT ); Fri, 5 May 2023 07:28:03 -0400 Received: from wout1-smtp.messagingengine.com (wout1-smtp.messagingengine.com [64.147.123.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9BC4D1A61B for ; Fri, 5 May 2023 04:27:46 -0700 (PDT) Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailout.west.internal (Postfix) with ESMTP id 823463200A69; Fri, 5 May 2023 07:26:43 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute3.internal (MEProxy); Fri, 05 May 2023 07:26:44 -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=fm2; t= 1683286003; x=1683372403; bh=LVfz7LD5avQVdWRjATmJJMIFpWciQ3yMgiu 6oJ3/+m4=; b=kevcOMA2cmUTFrxAm3zFFeXPgMIJuhhU4/26H9W+NuHOe3WQICv FboMKloZoVC9Ht8qX77U4t8JTD45LmG0Rvpm/xLaGxE5tRtZeTqvD5JarQv7LO7T xnPIBMREXgxok9Ushp+6xeBAxglo/UsVcnAvOJzqmnY3PDghi7VRpdBIhcX8ldfg C1eE+4INIdFDlX/F8K1znRQEMer8W/gAIhogaAwIZfJkbdMc2nDawrA/c4ShHNuA zF858fYB3Y4QFEOsvpastGAHnGma/qRs34W1P3xfYI05TnXsXkBNMoIQ4tl2pcgW cUR/Q+V8xKWYCNvpGOywMR/Mj3UoAbp79hw== 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=fm3; t= 1683286003; x=1683372403; bh=LVfz7LD5avQVdWRjATmJJMIFpWciQ3yMgiu 6oJ3/+m4=; b=CYTOFlrpJPssqlSa5rep07WHqNnOxgVJLQOs654XB3W4kY6sKpa 1L2Oku81eE9x769e5Q0oy9Q/JZHQ7C22KBFYXZK30FL39qJma+w1hgoii2vqY9zn 4eZFsxPWD8BymQZiYDrlzz3oWIKjX5/k5osjTC04GVRkAnte8JdCNChC+WGbVsHc rkJAaqMOk4nPrV9LHBe5SUoODGgVRfT7sPsMbFA6Xbok6igWv9ZwHsvL3MIRF+5f WVIsX1XGDMmnJ4ZvQuEtND8m/k7+12rQxvxHZO+cSaXNCo9JfxqxGCs+9sKMgLj0 YurveA0pA++wU/UqxZIoBntBqSShYalcIIA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrfeefvddgfeelucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpeforgig ihhmvgcutfhiphgrrhguuceomhgrgihimhgvsegtvghrnhhordhtvggthheqnecuggftrf grthhtvghrnhepvedvleeijeegvdekffehkeehieelhfeggfffheetkeeuledvtdeuffeh teeltdffnecuvehluhhsthgvrhfuihiivgepfeenucfrrghrrghmpehmrghilhhfrhhomh epmhgrgihimhgvsegtvghrnhhordhtvggthh X-ME-Proxy: Feedback-ID: i8771445c:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Fri, 5 May 2023 07:26:42 -0400 (EDT) From: Maxime Ripard Date: Fri, 05 May 2023 13:25:22 +0200 Subject: [PATCH v4 20/68] clk: stm32f4: mux: Add a determine_rate hook MIME-Version: 1.0 Message-Id: <20221018-clk-range-checks-fixes-v4-20-971d5077e7d2@cerno.tech> References: <20221018-clk-range-checks-fixes-v4-0-971d5077e7d2@cerno.tech> In-Reply-To: <20221018-clk-range-checks-fixes-v4-0-971d5077e7d2@cerno.tech> To: Michael Turquette , Stephen Boyd Cc: linux-clk@vger.kernel.org, Maxime Ripard , Alexandre Torgue , Maxime Coquelin , linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com X-Mailer: b4 0.12.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2028; i=maxime@cerno.tech; h=from:subject:message-id; bh=EiQTKXTxWl310eP7gvoXbVwd4WahDHb5ImRJPMpg1x8=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDCkhzxf/OyKwslul+tjbacI6e77szq8Ml903Ofj82sL9a3Z1 5nH5dZSyMIhxMciKKbLECJsviTs163UnG988mDmsTCBDGLg4BWAi/zcz/LN6+mjn3uNb+3/y2swVFg y9FezIINh36HHo8Rs9KitMzSQZ/lmWnGl5L3u8paby+/KLX1n/Z69PXvC/rfZfEOuMqFlcX9kA X-Developer-Key: i=maxime@cerno.tech; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org The STM32F4 mux 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 candidates to trigger that parent change are either the assigned-clock-parents device tree property or 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. However, the upstream device trees seem to use assigned-clock-parents on that clock to force the parent at boot time, so it's likely that the author intent was to force the parent through the device tree and prevent any reparenting but through an explicit call to clk_set_parent(). This case would be equivalent to setting the determine_rate implementation to clk_hw_determine_rate_no_reparent(). 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. Cc: Alexandre Torgue Cc: Maxime Coquelin Cc: linux-arm-kernel@lists.infradead.org Cc: linux-stm32@st-md-mailman.stormreply.com Signed-off-by: Maxime Ripard --- drivers/clk/clk-stm32f4.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c index 473dfe632cc5..07c13ebe327d 100644 --- a/drivers/clk/clk-stm32f4.c +++ b/drivers/clk/clk-stm32f4.c @@ -1045,6 +1045,7 @@ static int cclk_mux_set_parent(struct clk_hw *hw, u8 index) } static const struct clk_ops cclk_mux_ops = { + .determine_rate = clk_hw_determine_rate_no_reparent, .get_parent = cclk_mux_get_parent, .set_parent = cclk_mux_set_parent, };