From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95615C433E0 for ; Wed, 20 Jan 2021 02:42:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 52E11230FE for ; Wed, 20 Jan 2021 02:42:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731594AbhATClF (ORCPT ); Tue, 19 Jan 2021 21:41:05 -0500 Received: from mail.kernel.org ([198.145.29.99]:46618 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730013AbhATB2c (ORCPT ); Tue, 19 Jan 2021 20:28:32 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5C1AD22241; Wed, 20 Jan 2021 01:26:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611106001; bh=3G3E7KWC6d4c7VoJN3B4ZwtGBHWj7WRyCTjKW4mNPCs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hu5v67N1ncDAIBT7W+wknGyzXsQY3x6CUKXJ4EgI4cvMv08rmkqUPjOpub7oXMS6z LefJZT0JVLbVposI1Jcw8K76BRwwWdxdxWSw2y8L7HTtDg217/dOJffYTmWhPvdKOY r9+24L8XN4gmI1FMU/o/nTW/bMsEFv1AAaQd2L6wOZBl+FMyKSE7fTeWBrIIRYfUJR uCAIcKmijQAJO8gIBOTYdtCA1JJh8QMfpsM6SdFX5OTSRPDsal90Gxax03j7XqTORS SeZYBWmrA+uQyWdxJGEj06R/3sq4ZU89hQAVOObdQvKXPMOnMeR1eL2WkTN2DSALB/ Ra1yb6LHOyqPQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sagar Shrikant Kadam , Palmer Dabbelt , Sasha Levin , devicetree@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH AUTOSEL 5.10 29/45] dts: phy: fix missing mdio device and probe failure of vsc8541-01 device Date: Tue, 19 Jan 2021 20:25:46 -0500 Message-Id: <20210120012602.769683-29-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210120012602.769683-1-sashal@kernel.org> References: <20210120012602.769683-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sagar Shrikant Kadam [ Upstream commit be969b7cfbcfa8a835a528f1dc467f0975c6d883 ] HiFive unleashed A00 board has VSC8541-01 ethernet phy, this device is identified as a Revision B device as described in device identification registers. In order to use this phy in the unmanaged mode, it requires a specific reset sequence of logical 0-1-0-1 transition on the NRESET pin as documented here [1]. Currently, the bootloader (fsbl or u-boot-spl) takes care of the phy reset. If due to some reason the phy device hasn't received the reset by the prior stages before the linux macb driver comes into the picture, the MACB mii bus gets probed but the mdio scan fails and is not even able to read the phy ID registers. It gives an error message: "libphy: MACB_mii_bus: probed mdio_bus 10090000.ethernet-ffffffff: MDIO device at address 0 is missing." Thus adding the device OUI (Organizationally Unique Identifier) to the phy device node helps to probe the phy device. [1]: VSC8541-01 datasheet: https://www.mouser.com/ds/2/523/Microsemi_VSC8541-01_Datasheet_10496_V40-1148034.pdf Signed-off-by: Sagar Shrikant Kadam Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin --- arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts b/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts index 4a2729f5ca3f0..60846e88ae4b1 100644 --- a/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts +++ b/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts @@ -88,6 +88,7 @@ ð0 { phy-mode = "gmii"; phy-handle = <&phy0>; phy0: ethernet-phy@0 { + compatible = "ethernet-phy-id0007.0771"; reg = <0>; }; }; -- 2.27.0