From patchwork Tue Dec 28 14:25:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 12700389 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9ED3BC433F5 for ; Tue, 28 Dec 2021 14:27:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=mwJlruC8/ZO+Lu+NbZOeV7LXvq8t+fQAkX8gLrp7GXI=; b=d1Y+1ym9BIc6dU rM726/13/Aq1SfAnuEM01QMhGeErEwx1Kq2YvkW5Kc6JTu7c1jmuD8AJ6+92FQtq0QGLuH2+tdioo wgvyss3McstdVG6TrokgIWnDoXVsRLp4N1ky9p8tYRFKqH3ovMJ/4qcrKei3lvqlGnQXdrhU3GB8L WgvvO9ZmoxqeQNCce2R96ef+c8kb7EwTpy9lAviWWSfKJzZzwOy2srBbcNRUC4TaIgk6+7wZHKJ7u tgQqnQLCMy8whVoXvE4C1jfE/BtCNiFpPkU3E5SpqTtdFQlOCxIxzBkyGcV76O6fbJXoVrtl2hFyK dqjdzQYNipTH0xgByBjQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n2DQl-00170R-N0; Tue, 28 Dec 2021 14:26:23 +0000 Received: from ssl.serverraum.org ([176.9.125.105]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1n2DQh-0016yL-GB; Tue, 28 Dec 2021 14:26:21 +0000 Received: from mwalle01.kontron.local. (unknown [IPv6:2a02:810b:4340:43bf:fa59:71ff:fe9b:b851]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ssl.serverraum.org (Postfix) with ESMTPSA id 759F122246; Tue, 28 Dec 2021 15:26:12 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2016061301; t=1640701574; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=R7nzXrrSsFrUHRSgijOJS8QeBq0JY35WUr2whTQ6JzM=; b=Mdr6LWqzC3IcHb3GPTOPvu6mLduLfAc1d91yRwpVrPDM3N1JMBc9TFFErc3tdNqHi8WSVR /634D2XTLXxZlujv0T7ReIQoXRFDx5uTdST3fuARDna6iOoZ1WVWlfe8nT2PO+aa7aD2uu wAHqRd6bUXoMDoYzRB8oWR2jUxT3+D8= From: Michael Walle To: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org Cc: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Srinivas Kandagatla , Shawn Guo , Li Yang , Frank Rowand , "David S . Miller" , Jakub Kicinski , Ansuel Smith , Andrew Lunn , Michael Walle Subject: [PATCH 0/8] nvmem: add ethernet address offset support Date: Tue, 28 Dec 2021 15:25:41 +0100 Message-Id: <20211228142549.1275412-1-michael@walle.cc> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211228_062619_741359_4BA441BD X-CRM114-Status: GOOD ( 16.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is my second attempt to solve the use case where there is only the base MAC address stored in an EEPROM or similar storage provider. This is the case for the Kontron sl28 board and multiple openwrt supported boards. Introduce an NVMEM transformation op. This can then be used to parse or swap bytes of the NVMEM cell value. A transformation might also have multiple output values, like in the base mac address case. It reads the mac address from the nvmem storage and generates multiple individual addresses, i.e. on our board we reserve 8 consecutive addresses. These addresses then can be assigned to different network interfaces. To make it possible to reference different values we need to introduce an argument to the phandle. This additional argument is then an index which is can be used by the transformation op. Previous discussion can be found here: https://lore.kernel.org/linux-devicetree/20211123134425.3875656-1-michael@walle.cc/ Michael Walle (8): of: base: add of_parse_phandle_with_optional_args() dt-bindings: nvmem: add transformation bindings nvmem: core: add an index parameter to the cell nvmem: core: add transformations support net: add helper eth_addr_add() nvmem: transformations: ethernet address offset support arm64: dts: ls1028a: sl28: get MAC addresses from VPD arm64: defconfig: enable NVMEM transformations .../devicetree/bindings/mtd/mtd.yaml | 7 +- .../bindings/nvmem/nvmem-transformations.yaml | 46 ++++++++++++ .../fsl-ls1028a-kontron-kbox-a-230-ls.dts | 8 ++ .../fsl-ls1028a-kontron-sl28-var1.dts | 2 + .../fsl-ls1028a-kontron-sl28-var2.dts | 4 + .../fsl-ls1028a-kontron-sl28-var4.dts | 2 + .../freescale/fsl-ls1028a-kontron-sl28.dts | 17 +++++ arch/arm64/configs/defconfig | 1 + drivers/nvmem/Kconfig | 7 ++ drivers/nvmem/Makefile | 1 + drivers/nvmem/core.c | 44 ++++++++--- drivers/nvmem/imx-ocotp.c | 4 +- drivers/nvmem/transformations.c | 73 +++++++++++++++++++ drivers/of/base.c | 23 ++++++ include/linux/etherdevice.h | 14 ++++ include/linux/nvmem-provider.h | 13 +++- include/linux/of.h | 12 +++ 17 files changed, 260 insertions(+), 18 deletions(-) create mode 100644 Documentation/devicetree/bindings/nvmem/nvmem-transformations.yaml create mode 100644 drivers/nvmem/transformations.c