From patchwork Thu Dec 5 16:43:01 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: 847614 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 62255224B0E; Thu, 5 Dec 2024 16:43:32 +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=1733417012; cv=none; b=dq/QUe308mEWc4xR7MItjmKR2khg4eeVOIBxwgtFWv/X7q/5ZOxBgcKcqWHERwIfT+IHfmv+to3xJYxJhFq0ALWHqsKSnaC16QjS0yDtV/qs+5zZr4spBWbkcNIXCouocti3L0PXafv53Ycv/UMr0zhxtNYUh6WZjK/8sW+TWyg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733417012; c=relaxed/simple; bh=qT18XtbzllFJO6K/EGbpIUkVOz74iHPo6IUZe3P4fQc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=qG/3/KqdCAMplot4KBaGmRF0+Nk68cWNC5frhoV7b/yn5Bn+S94C5GYTJwAmqyz0pQ9foL1D0GosNS8kBPGicwLrTUWhWNG3Hqi8dW51KLUWEBAH/vydUeBU0DlC3fpH4Q8TKrpB3jG00n9+UNukwnP91y4ocVJ7QXDynjB0p+w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GB8zKrNG; 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="GB8zKrNG" Received: by smtp.kernel.org (Postfix) with ESMTPS id 03FCDC4CEED; Thu, 5 Dec 2024 16:43:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733417012; bh=qT18XtbzllFJO6K/EGbpIUkVOz74iHPo6IUZe3P4fQc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=GB8zKrNGGftjiDTmD1Tl/rUYuN6P3xev7DqIfBj/0kmKu4jWc26BiICyXkbxO/hdI 13qaIvyVa0g3hzsMs+bQbrVjU2c+0ZAY8BvO9HulrPK1ReQZqEidXnhTPb7j+TdXYG 5NqyuuPR7ywggaHsFr9+C9q79bTQxfSDEozo9az5e6jhWJbz4Z3xyi5Sdf75QoReR8 vhCigSKXXTImIBY8zCaBPp862A6SkwMjgNruEVN19gYpQq/TG/l4DxuBqIL3iMgu93 xa7hm7v9KIsjFnVEgvACrCJbHuqYUm/BE1ct+TJmyYxmhmKgFdIq/vCmPQpwbJ+7rp hTTB29wIuN/Cw== 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 E98C5E7716D; Thu, 5 Dec 2024 16:43:31 +0000 (UTC) From: Jan Petrous via B4 Relay Date: Thu, 05 Dec 2024 17:43:01 +0100 Subject: [PATCH net-next v8 04/15] 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: <20241205-upstream_s32cc_gmac-v8-4-ec1d180df815@oss.nxp.com> References: <20241205-upstream_s32cc_gmac-v8-0-ec1d180df815@oss.nxp.com> In-Reply-To: <20241205-upstream_s32cc_gmac-v8-0-ec1d180df815@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 , Andrew Lunn 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 , 0x1207@gmail.com, fancer.lancer@gmail.com, "Jan Petrous (OSS)" , "Russell King (Oracle)" X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1733417009; l=1509; i=jan.petrous@oss.nxp.com; s=20240922; h=from:subject:message-id; bh=3exSjKEVuojsQxBeLN9HdAigOEc+2YUOvrl9BYstKAs=; b=mNFYLfQv105ROGOwlEnxB5fCA+2r6XhmI/q3hg5Ago/2NAp0TTsQCa8sMxSHZlBt7CzuAmfoG aMbYb0d/YdYB7qfGFkN26+mFOUm0y+OMiVWKG0DWo/JUd8XpPN+AVPV 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 Reviewed-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 563c46205685..a746f056ed57 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