From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Mon, 27 Nov 2023 07:51:33 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1r7VSu-00Aeu9-1v for lore@lore.pengutronix.de; Mon, 27 Nov 2023 07:51:33 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1r7VSu-0001Cc-L9 for lore@pengutronix.de; Mon, 27 Nov 2023 07:51:33 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ptHZ3teQgLN8SrpDezNCvscYpiPB+FRkwz4AfbpTMFE=; b=UeiCQj7y8H9Pb68djTp22mAvbi e/+7PLmTeU3wdbQKUA+ci03Y6zCMqd6a8ih30XsvND9DOoWCDMj7LyxPenKwGop8NpWzA9gKmBswV rUVcgf1S5Vk+eXnyKIhNc2bD2z9GQ3LpbktBjoi6cZ0wnyyPe+LLjEu4fv+6SALGi86V7jcXZNGOi ps8+oaI862EIXSgu4wSBf/fv4LX6NX5tpsZiCbM3OSWxbTDsUk0RpnBbDweDHtFPPBzn3rIAKCvfY Uh+pO2hhuPfS2aw87rXlX3fPfjwKNQGhxSmD5NoZ2bHjTmiw5Fcr6J17vZhPIgxfmCKKB+xIRYxqa ty/Y6lpA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r7VRa-001bdH-1E; Mon, 27 Nov 2023 06:50:10 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r7VRL-001bWI-1T for barebox@lists.infradead.org; Mon, 27 Nov 2023 06:49:57 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1r7VRK-0000dG-AM; Mon, 27 Nov 2023 07:49:54 +0100 Received: from [2a0a:edc0:0:1101:1d::54] (helo=dude05.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1r7VRJ-00Bsit-UB; Mon, 27 Nov 2023 07:49:53 +0100 Received: from localhost ([::1] helo=dude05.red.stw.pengutronix.de) by dude05.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1r7VRJ-009GPh-2l; Mon, 27 Nov 2023 07:49:53 +0100 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Mon, 27 Nov 2023 07:49:38 +0100 Message-Id: <20231127064947.2207726-5-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231127064947.2207726-1-a.fatoum@pengutronix.de> References: <20231127064947.2207726-1-a.fatoum@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231126_224955_672273_F445454B X-CRM114-Status: UNSURE ( 9.72 ) X-CRM114-Notice: Please train this message. X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.9 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 04/13] clk: divider: implement CLK_DIVIDER_ALLOW_ZERO X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) We already support CLK_DIVIDER_ONE_BASED and incoming STM32MP13 clock support can have clock dividers evaluate to zero. Add support for CLK_DIVIDER_ALLOW_ZERO analogously to Linux. Signed-off-by: Ahmad Fatoum --- drivers/clk/clk-divider.c | 6 ++++++ include/linux/clk.h | 1 + 2 files changed, 7 insertions(+) diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c index 1eaff1675b24..150b1fe60fd4 100644 --- a/drivers/clk/clk-divider.c +++ b/drivers/clk/clk-divider.c @@ -88,6 +88,12 @@ unsigned long divider_recalc_rate(struct clk *clk, unsigned long parent_rate, unsigned int div; div = _get_div(table, val, flags, width); + if (!div) { + WARN(!(flags & CLK_DIVIDER_ALLOW_ZERO), + "%s: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n", + clk->name); + return parent_rate; + } return DIV_ROUND_UP_ULL((u64)parent_rate, div); } diff --git a/include/linux/clk.h b/include/linux/clk.h index 9975c1a601c4..269664b0ba63 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -417,6 +417,7 @@ struct clk_divider { #define clk_div_mask(width) ((1 << (width)) - 1) #define CLK_DIVIDER_POWER_OF_TWO (1 << 1) +#define CLK_DIVIDER_ALLOW_ZERO (1 << 2) #define CLK_DIVIDER_HIWORD_MASK (1 << 3) #define CLK_DIVIDER_READ_ONLY (1 << 5) -- 2.39.2