From patchwork Mon Oct 28 20:24:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Petrous via B4 Relay X-Patchwork-Id: 839390 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 064041DFE00; Mon, 28 Oct 2024 20:25:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730147128; cv=none; b=mczAopYWxRndE4cq4hc2Z5nK252gqb8Xe2TEjx8rQPUWM45xtBhmRjztIk97uq8mE2FGQU9rj61o6D0lOd+unCxm6OBANq6rHtc8JHvE2tvZ8m96dfRX568rD2X2yIsDWusPkHwjPUHCZ2z3VrxUhLom9I99fsYEOJqFr1f5BS0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730147128; c=relaxed/simple; bh=WZ360woTqlKwEAB+mCUzTvQfH/YCNcvh0ZZPLL1DHzM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AZSLRNhqGdUM83QJ0qfy+OP/Gew763rCSVUCZEwoELRaI+j49ZpbeQHyu85j2WYb4bH2ozW1nkOivERqbc2hze03XfD2/IIMw+Sug0b1yk8NFeBRyytGuiN8JZrimcSba2vvn/pkMk1VGL2vzlLBE9WiVymfafwBHhMph/XE1v8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=sqUGHS6E; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="sqUGHS6E" Received: by smtp.kernel.org (Postfix) with ESMTPS id 8043CC4CEF4; Mon, 28 Oct 2024 20:25:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730147127; bh=WZ360woTqlKwEAB+mCUzTvQfH/YCNcvh0ZZPLL1DHzM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=sqUGHS6E9D8Cce/8hXHKu8q7oyPnEhsFn5fN7K8UA77yu5WXmV5O+RVLIPIBVvtrG /VQXlHV65lqZwiOzaCWUsPnRuRhbpkulxNDZxfXm8TTbb+YsmcXHc3+FI4eF9ruYxH wERKYB/bJUQaCJvWaAAnqw664G38jUFJzesLc1CpgFT1PGSvmNzhyJd+GlJ/0qDi/9 kCUO76Wt2VUXUVR2SnQmJ+3KDQ6px2n5Sr3sJacwvxzd+QmB+rroQiRja9OsZ7SIgj AUCY9in5XYjjDs5apnpwiavreYnhb2Kshd6eXkWIOD5qGaR83qozoYULeX0xoybUnC Vz2/vKKIu50tg== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 774BCD5B148; Mon, 28 Oct 2024 20:25:27 +0000 (UTC) From: Jan Petrous via B4 Relay Date: Mon, 28 Oct 2024 21:24:46 +0100 Subject: [PATCH v4 04/16] net: phy: Add helper for mapping RGMII link speed to clock rate Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241028-upstream_s32cc_gmac-v4-4-03618f10e3e2@oss.nxp.com> References: <20241028-upstream_s32cc_gmac-v4-0-03618f10e3e2@oss.nxp.com> In-Reply-To: <20241028-upstream_s32cc_gmac-v4-0-03618f10e3e2@oss.nxp.com> To: Maxime Coquelin , Alexandre Torgue , Jose Abreu , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Vinod Koul , Richard Cochran , Andrew Lunn , Heiner Kallweit , Russell King , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Emil Renner Berthing , Minda Chen , Nicolas Ferre , Claudiu Beznea , Iyappan Subramanian , Keyur Chudgar , Quan Nguyen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Giuseppe Cavallaro Cc: linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org, imx@lists.linux.dev, devicetree@vger.kernel.org, NXP S32 Linux Team , "Jan Petrous (OSS)" , "Russell King (Oracle)" X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1730147124; l=1401; i=jan.petrous@oss.nxp.com; s=20240922; h=from:subject:message-id; bh=iiWKJLaFCOsjPP4V/Ba8wScxk46hL1tc6KzIcyhY4QE=; b=a9z6WZPW3ibl1mYkhy6D4vsb7agV8md+c5fFx8SXTmlOkpCCbcb7sjHXivuW60pMPXXVbH2zP XV8gFEKPCteCW8WxxpY3MGLFe2PzPTgI5RfsmjcupWRZm67wFrIF7WB X-Developer-Key: i=jan.petrous@oss.nxp.com; a=ed25519; pk=Ke3wwK7rb2Me9UQRf6vR8AsfJZfhTyoDaxkUCqmSWYY= X-Endpoint-Received: by B4 Relay for jan.petrous@oss.nxp.com/20240922 with auth_id=217 X-Original-From: "Jan Petrous (OSS)" Reply-To: jan.petrous@oss.nxp.com From: "Jan Petrous (OSS)" The RGMII interface supports three data rates: 10/100 Mbps and 1 Gbps. These speeds correspond to clock frequencies of 2.5/25 MHz and 125 MHz, respectively. Many Ethernet drivers, including glues in stmmac, follow a similar pattern of converting RGMII speed to clock frequency. To simplify code, define the helper rgmii_clock(speed) to convert connection speed to clock frequency. Suggested-by: Russell King (Oracle) Signed-off-by: Jan Petrous (OSS) --- include/linux/phy.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/include/linux/phy.h b/include/linux/phy.h index a98bc91a0cde..e28c971d7616 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -298,6 +298,29 @@ static inline const char *phy_modes(phy_interface_t interface) } } +/** + * rgmii_clock - map link speed to the clock rate + * @speed: link speed value + * + * Description: maps RGMII supported link speeds + * into the clock rates. + * + * Returns: clock rate or negative errno + */ +static inline long rgmii_clock(int speed) +{ + switch (speed) { + case SPEED_10: + return 2500000; + case SPEED_100: + return 25000000; + case SPEED_1000: + return 125000000; + default: + return -EINVAL; + } +} + #define PHY_INIT_TIMEOUT 100000 #define PHY_FORCE_TIMEOUT 10