From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1E225606A88B for ; Wed, 11 Nov 2026 11:56:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=uEeLUY0v; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.a=rsa-sha256 header.s=mchp header.b=oiYou3WK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding: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-Unsubscribe-Post:List-Owner; bh=cG+VkpR+yQd20gsuxWLhk8zXfW6tnW5GC/DvS74uGDk=; b=uEeLUY0vy4mb3/ImfIailLppjQ GBPc47rZQZFXYZYP0TmuluM3L4epSwns8P5UEZ9mjtAyI3S6cQR3qgA0N8YBAr3bvM0yYHHuSHtGm EDNaoL8+zjzCJb96otPq8z7FP1EmT9E9jRF7+/yKsCpZyOD9sQnHUcpwSDpvax0uyPYrV7xpXwlOJ pa8QIcQIa4igCasXiBa53waXXAK4yhv1h7DIVhH38o154HtyaTdzeORItbCDRUnk+21NYweq0A5k+ SJmltVqgnbk5HAaHRf3FwMlEWIWqKlnFgVNicVaTJ7TOn93RMIfeEppgDkvrMUA78EDDzzzyaMRyc Hub03QSQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xR6vp-00000006ZIk-42zC; Wed, 11 Nov 2026 11:56:01 +0000 Received: from esa.microchip.iphmx.com ([68.232.154.123]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xR6vm-00000006ZHm-10gg; Wed, 11 Nov 2026 11:56:00 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1794398158; x=1825934158; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=iAo/MtDhNKHmBSnZPURm1ePfYky+B/A+M0UcnkNs04Y=; b=oiYou3WKbRfiEy0NpgYtJWYYQH2hpQfxLTVtl8MmpfamfzBPtMI0fjKj 4VIu/Gj/AuEGOBXffcZdpuIurcVRXDr3DtanIicsoKob0VpukoklYcAXl OzKN4CJGB1Kf2btDPBvQhrixQ8Wqe8ZtcMr+7FtjQbzxBefdIdd5kC0AC PpKDa+ETBrKd8pdYqZUMiTKYvEpPvbiQUWZClzWAfGR7Dxx/z2nSpNcXV EUqOGE+/CiO3Mr/AsSp1p4UAFW8fCKIBlgamFGbmo/9YcFEmv1A/0m9mN NQs6dSzrP+/OP/tQD+ZeZbrI/5SMju1gc2oT95Q40COFxvMV4Lmaeaml4 A==; X-CSE-ConnectionGUID: LYG/GoI+QpaP1PxmQQ3/0A== X-CSE-MsgGUID: /ghRVTySTreVrSckWNpD8Q== X-IronPort-AV: E=Sophos;i="6.27,207,1787036400"; d="scan'208";a="65385184" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa4.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Nov 2026 04:55:56 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.87.72) by chn-vm-ex1.mchp-main.com (10.10.87.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.56; Wed, 11 Nov 2026 04:55:55 -0700 Received: from che-ll-i67131.microchip.com (10.10.85.11) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.58 via Frontend Transport; Wed, 11 Nov 2026 04:55:46 -0700 From: Manikandan Muralidharan To: , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [PATCH v10 0/8] Read MAC address from SST vendor specific SFDP region Date: Wed, 11 Nov 2026 17:25:32 +0530 Message-ID: X-Mailer: git-send-email 2.43.0 X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261111_035558_561383_F78F5AD0 X-CRM114-Status: GOOD ( 21.20 ) X-Spam-Score: -4.4 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Some Microchip/SST QSPI flashes (e.g. the SST26VF064BEUI) are factory programmed with globally unique, write-protected EUI-48 and EUI-64 identifiers stored in a vendor-specific SFDP parameter table. On boards that have no on-board EEPROM (sama5d27_wlsom1, sama5d29 curiosity, sam9x75 curiosity) this is a reliable source for an Ethernet MAC address, instead of relying on a U-Boot-provided or random address. The series exposes the SFDP as a generic NVMEM framework with no vendor code in the SPI NOR core: - The SPI NOR core exposes the entire SFDP as a generic read-only NVMEM device, rooted at a new "sfdp" child node of the flash. - A new NVMEM layout driver (drivers/nvmem/layouts/) locates the Microchip vendor parameter table at runtime and presents the EUI-48 as a "mac-address" cell. - Arbitrary parameters can be read with a standard fixed-layout (known offset) or with an nvmem-layout parser (location discovered at runtime). Changes in v10: - Rebased on v7.4-rc1 merge window. - 3/8 - Rebased on the nvmem SRCU rework; of_node_put() moves into the reworked nvmem_release(). No functional change. - 4/8 - Commit message wording only; - 5/8 - Drop the read_post_process() callback: the EUI-48 is already stored in canonical MAC order (24-bit OUI followed by the 24-bit extension identifier), so the cell is exposed as-is. Changes in v9: - 3/8 - Add Reviewed-by: Miquel Raynal, Reviewed-by: Michael Walle. - 4/8 - Add Reviewed-by: Miquel Raynal, Reviewed-by: Michael Walle. Drop the early return after of_get_compatible_child(). Updated the comments and commit message to match. - 5/8 - Move the Makefile entry for sst26vf-sfdp-eui.o to the end. Move the ETH_ALEN check to the top of sfdp_eui_read_post_process() and bail out early. Compute nph as hdr.nph+1 and loop for the 0-based parameter-header count. Cosmetic fixes. Changes in v8: - New 3/8 - nvmem: core: take a reference on dev.of_node in nvmem_register(). v7's 3/8 (now 4/8) called of_node_put() right after devm_nvmem_register(), which left nvmem->dev.of_node backed by no reference at all once the caller's own reference was dropped. Fixing it at the nvmem_register() by taking its own of_node_get() when assigning nvmem->dev.of_node and released in nvmem_release(). - 6/8 - drop the #address-cells/#size-cells from the qspi1_flash node. Changes in v7: - 1/7 - Add blank lines in the "sfdp" schema per review; Add Reviewed-by: Rob Herring. - 2/7 - Add Reviewed-by: Rob Herring. - 3/7 - Drop the spi_nor_sfdp_nvmem_put_np() helper and call of_node_put() right after devm_nvmem_register(). - 6/7 - Note in the commit message that the sama5d27_wlsom1 SoM ships the factory-programmed SST26VF064BEUI, so the EUI-48 "mac-address" cell is always present. Changes in v6: - 3/7 - Move the SFDP NVMEM registration from sfdp.c into core.c, since sfdp.c is only for parsing the tables;use of_get_compatible_child() instead of the open-coded child-node lookup. - 2/7, 6/7, 7/7 - Add Reviewed-by: Linus Walleij. Changes in v5: - 1/7 and 5/7 - Add R-b tags - 3/7- Rework the comments, function name and commit message.Check all the nodes (for_each_available_child) for the right compatible "jedec,sfdp" instead of node name. Changes in v4: - Rework per v3 review: remove the vendor-specific SFDP handling from the SPI NOR core; expose the whole SFDP as a generic read-only NVMEM device and move the EUI extraction into an nvmem-layout driver. - Introduce a new nvmem-layout driver to discover the vendor-table location at runtime; no offset hardcoded in the device tree. - Describe the SFDP via a dedicated "sfdp" subnode (compatible "jedec,sfdp"), which also resolves the v3 dtbs_check "Unevaluated properties ('nvmem-layout')" warning. - Reverse the stored EUI bytes into canonical MAC order. - Enable the layout in sama5_defconfig. Changes in v3: - 2/3 - add support to update the QSPI partition into 'fixed-partition' binding in sama5d27_wlsom1 - 3/3 - add nvmem-layout in qspi node for EUI48 MAC Address and nvmem cell properties for macb node in sama5d27_wlsom1 Changes in v2: - 1/3 - parse the SST vendor table, read and store the addresses into a resource - managed space. Register the addresses into NVMEM framework - 2/3 - add support to update the QSPI partition into 'fixed-partition' binding v9: https://lore.kernel.org/all/cover.1792145382.git.manikandan.m@microchip.com/ v8: https://lore.kernel.org/all/cover.1790847519.git.manikandan.m@microchip.com/ Manikandan Muralidharan (8): dt-bindings: mtd: jedec,spi-nor: allow the SFDP to be exposed via NVMEM dt-bindings: nvmem: layouts: add Microchip/SST SFDP EUI layout nvmem: core: take a reference on dev.of_node in nvmem_register() mtd: spi-nor: sfdp: expose the SFDP as a read-only NVMEM device nvmem: layouts: add Microchip/SST SFDP EUI layout driver ARM: dts: microchip: sama5d27_wlsom1: use fixed-partitions for QSPI flash ARM: dts: microchip: sama5d27_wlsom1: read MAC address from QSPI SFDP ARM: configs: sama5: enable Microchip/SST SFDP EUI NVMEM layout .../bindings/mtd/jedec,spi-nor.yaml | 20 +++ .../layouts/microchip,sst26vf-sfdp-eui.yaml | 60 +++++++ .../bindings/nvmem/layouts/nvmem-layout.yaml | 1 + MAINTAINERS | 6 + .../dts/microchip/at91-sama5d27_wlsom1.dtsi | 63 ++++--- .../dts/microchip/at91-sama5d27_wlsom1_ek.dts | 2 + arch/arm/configs/sama5_defconfig | 1 + drivers/mtd/spi-nor/core.c | 75 +++++++++ drivers/nvmem/core.c | 5 +- drivers/nvmem/layouts/Kconfig | 10 ++ drivers/nvmem/layouts/Makefile | 1 + drivers/nvmem/layouts/sst26vf-sfdp-eui.c | 158 ++++++++++++++++++ 12 files changed, 376 insertions(+), 26 deletions(-) create mode 100644 Documentation/devicetree/bindings/nvmem/layouts/microchip,sst26vf-sfdp-eui.yaml create mode 100644 drivers/nvmem/layouts/sst26vf-sfdp-eui.c base-commit: 05441d697f7f9a927264f4058cbbc6a03dfcac9d -- 2.43.0