From patchwork Tue Nov 19 15:00:10 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: 844316 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 CB5D31CF293; Tue, 19 Nov 2024 15:01:04 +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=1732028464; cv=none; b=BVCLI/Li7xfkZrneu54nDsFOPn/aOIVfvGO9nDpWDFwWBr85pxaUYHDEpPnuDDsvJmr4H4K7jya66/4tYKpJXUS720wBgSvsAsYsNoJZ0SUA9CdJp3Ka7a/fQb4+5RvEuTRSqxOr5o9gT7ZpZIJy0WT0vzAMkOH16qOdaGzdQZU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732028464; c=relaxed/simple; bh=6xMLlIpSN0JBvla5nTP1dqcG6Ed1UwqOOxwMgbKzQ0A=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=qACUdn8nTWYYt53dcb0ucMcsolR5gZMP09Go6us95tVuEl99RYC5rywVPbs7zLQMh+2PfTkhXZntbL+yKrsrvFm/GUNzAXibW92N1v0oFKYoCEpTH6NtGxk8MeHORoqn1M4LFVIzR9P8VqANK1DYsR0WqI2JbG0rhzLK4ZVFP+4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Cjb8vBoW; 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="Cjb8vBoW" Received: by smtp.kernel.org (Postfix) with ESMTPS id 4F7F5C4CEE0; Tue, 19 Nov 2024 15:01:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732028464; bh=6xMLlIpSN0JBvla5nTP1dqcG6Ed1UwqOOxwMgbKzQ0A=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=Cjb8vBoWvTq7UCm8IA2PWVqLbNSVrqjByOM5WR/sCrWEg+eGO7VD85jZmsotPVpL+ JMSzlg5q1ty/1SFQUGC7VRDSam04nEeag4ccEUbPCj1LjPX5Dn1bLOZ5h/cAbWLSIS pV8pUMxb0sLr5aJrxrTIWXRqBaugh7U6RhWz0o834ZzuF4LSnIaZoGMKIB7ifAnEC3 5xgM49YuW69HyCqvMkDbt/3uLeEQK5sU9ff29wmwhDQrxQiMEXH5UktmsOvuZes5QV 1Q9ABK+pa3veCWQpGYnVV7vBGFo/gvOGyi/6a3SV9EouZpO/xwn2E6eMpC4HSWwphB OfPgczluSJb7w== 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 43740D44166; Tue, 19 Nov 2024 15:01:04 +0000 (UTC) From: Jan Petrous via B4 Relay Date: Tue, 19 Nov 2024 16:00:10 +0100 Subject: [PATCH v5 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: <20241119-upstream_s32cc_gmac-v5-4-7dcc90fcffef@oss.nxp.com> References: <20241119-upstream_s32cc_gmac-v5-0-7dcc90fcffef@oss.nxp.com> In-Reply-To: <20241119-upstream_s32cc_gmac-v5-0-7dcc90fcffef@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=1732028461; l=1444; i=jan.petrous@oss.nxp.com; s=20240922; h=from:subject:message-id; bh=9P0ry2iOu969sx+k09VLkaOhf19TsKhJriPqamf/d5Q=; b=3x1pZvA190M4/JSVKA6683Fqp6WmSzqEWmYvvett/32O9XyIAaAkbscj0re5YlXILhFY1HZEn +qAywTHv1c2BOioB2wL4dAHT4KiTNVvLwyHWaBz2kKoAR8J4QSJ4x9D 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) Reviewed-by: Andrew Lunn 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