From patchwork Tue Dec 28 14:25:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 12700387 X-Patchwork-Delegate: kuba@kernel.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28186C433F5 for ; Tue, 28 Dec 2021 14:26:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233974AbhL1O0Z (ORCPT ); Tue, 28 Dec 2021 09:26:25 -0500 Received: from ssl.serverraum.org ([176.9.125.105]:49879 "EHLO ssl.serverraum.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233714AbhL1O0U (ORCPT ); Tue, 28 Dec 2021 09:26:20 -0500 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 E1843223F7; Tue, 28 Dec 2021 15:26:17 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2016061301; t=1640701578; 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: in-reply-to:in-reply-to:references:references; bh=8u32QLgP+bx/Avj9/UQOtx/OkwJzp0bCtXU3LJH76Fc=; b=rzSLw3hes1+GfIvB++uAojB1vhiOCMw7vvcHgxa+s1zaJWBQvAiY+q7T+ZMDnLMLWnGGom 6CB6wl8wSGdh6iKpLdafzYSskmGWj0amUyv1546atnOWJRoeOOkoUdgMt/YpMikd8u4S5L /7EWzYL0lSOPqOcNW4K5NZ0x6sYrdGc= 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 6/8] nvmem: transformations: ethernet address offset support Date: Tue, 28 Dec 2021 15:25:47 +0100 Message-Id: <20211228142549.1275412-7-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211228142549.1275412-1-michael@walle.cc> References: <20211228142549.1275412-1-michael@walle.cc> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org An nvmem cell might just contain a base MAC address. To generate a address of a specific interface, add a transformation to add an offset to this base address. Add a generic implementation and the first user of it, namely the sl28 vpd storage. Signed-off-by: Michael Walle --- drivers/nvmem/transformations.c | 45 +++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/drivers/nvmem/transformations.c b/drivers/nvmem/transformations.c index 61642a9feefb..15cd26da1f83 100644 --- a/drivers/nvmem/transformations.c +++ b/drivers/nvmem/transformations.c @@ -12,7 +12,52 @@ struct nvmem_transformations { nvmem_cell_post_process_t pp; }; +/** + * nvmem_transform_mac_address_offset() - Add an offset to a mac address cell + * + * A simple transformation which treats the index argument as an offset and add + * it to a mac address. This is useful, if the nvmem cell stores a base + * ethernet address. + * + * @index: nvmem cell index + * @data: nvmem data + * @bytes: length of the data + * + * Return: 0 or negative error code on failure. + */ +static int nvmem_transform_mac_address_offset(int index, unsigned int offset, + void *data, size_t bytes) +{ + if (bytes != ETH_ALEN) + return -EINVAL; + + if (index < 0) + return -EINVAL; + + if (!is_valid_ether_addr(data)) + return -EINVAL; + + eth_addr_add(data, index); + + return 0; +} + +static int nvmem_kontron_sl28_vpd_pp(void *priv, const char *id, int index, + unsigned int offset, void *data, + size_t bytes) +{ + if (!id) + return 0; + + if (!strcmp(id, "mac-address")) + return nvmem_transform_mac_address_offset(index, offset, data, + bytes); + + return 0; +} + static const struct nvmem_transformations nvmem_transformations[] = { + { .compatible = "kontron,sl28-vpd", .pp = nvmem_kontron_sl28_vpd_pp }, {} };