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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 80AB4C636D3 for ; Mon, 6 Feb 2023 20:31:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229906AbjBFUbv (ORCPT ); Mon, 6 Feb 2023 15:31:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36394 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229796AbjBFUbu (ORCPT ); Mon, 6 Feb 2023 15:31:50 -0500 Received: from mail-wr1-x435.google.com (mail-wr1-x435.google.com [IPv6:2a00:1450:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A7F8E2A994 for ; Mon, 6 Feb 2023 12:31:49 -0800 (PST) Received: by mail-wr1-x435.google.com with SMTP id g6so3635725wrv.1 for ; Mon, 06 Feb 2023 12:31:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=oZGz/N+EtXFXjo58DVRXfyilGfBoD8ZSIHd32aC9uAk=; b=qVt6X7nK5L2aTBX3NzPXLdYxXaSBBHgcjYvq/eApTtZpLMf0tbHtNtxsMtBhw4MDwB divgFaZ6p21uIshKb24RzsHyyEcddqk7v07w1X+O98zHJ0qlHMNyzT8X/y9qQEdTL2uS GCGB+sIAmVoK0OhrgRs5OnwHHiMesOtiDpGLHWihKB1TIqkih2A2mH3gxY0vPItVoYYx 9UoDjMHsrdrKZxoyqD8GEnOVHac79oOhoeSBazUbXzL9EPaynRy8YPdSjVdoFxYp3XX5 4pWalI8IsrdBwHvjCCP2upLsXOsRJUE4JEy1nKh6C4gFIv7S35BY1gf1LAxAUc8AqXOl XZ0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=oZGz/N+EtXFXjo58DVRXfyilGfBoD8ZSIHd32aC9uAk=; b=7CIleq1nDkYzxxH0v0JWZL5SUIbTQPMdAnC9QJOK7fBj94zZU1DmZPS2FIHzuW94VD dKJbsmwK6KUQ++1RRx2Ejz1Uo3uCSvbCcRASzW3J5p0NSFy10sdnT6VZjQItLpHqu25z SgBtKb+Ex6kDaSes1BFaljAS+EJW5kEubjTBn/aZRogprsXv8+v4LhueVO8F6Ur4IzUk Hl+7U5Lrck6fJ3fFKN8l71AV1sOw9QjNiSM+OmEb5DRhwQXEqi89SWbsYE0pdT6sxRMd qKzCjS3pcrkupI/dwKYhpEy81mTX6RztBhKfo1vxzl8zGVZXKBIK98Jjw5CE6Zlz/QiI d2+Q== X-Gm-Message-State: AO0yUKWmf+452XEBNXio5/3CJi8gyBh3VeQwVWl3YFZPPVl+FhhK4mpD CN/Xe2J1ntp+hh3aMIWgl050nQ== X-Google-Smtp-Source: AK7set+FP1+I2Mhte/do++ECfuJE/LYx7mWnb91D5rDmAmd2fBjyJ11Jm+SPnGKVt2AkedbMQyBJPA== X-Received: by 2002:adf:f288:0:b0:2bd:e87c:e831 with SMTP id k8-20020adff288000000b002bde87ce831mr200596wro.69.1675715508181; Mon, 06 Feb 2023 12:31:48 -0800 (PST) Received: from [192.168.1.195] ([5.133.47.210]) by smtp.googlemail.com with ESMTPSA id q12-20020adfdfcc000000b002c3ec35f360sm2356622wrn.56.2023.02.06.12.31.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Feb 2023 12:31:47 -0800 (PST) Message-ID: <81a5c400-e671-fab3-732a-d615fa4242b3@linaro.org> Date: Mon, 6 Feb 2023 20:31:46 +0000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 Subject: Re: [PATCH v5 00/21] nvmem: core: introduce NVMEM layouts Content-Language: en-US To: Miquel Raynal , Michael Walle Cc: Jonathan Corbet , Rob Herring , Frank Rowand , Sascha Hauer , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Dan Carpenter References: <20221206200740.3567551-1-michael@walle.cc> <20230103163902.218cb5c7@xps-13> From: Srinivas Kandagatla In-Reply-To: <20230103163902.218cb5c7@xps-13> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Hi Michael/Miquel, I had to revert Layout patches due to comments from Greg about Making the layouts as built-in rather than modules, he is not ready to merge them as it is. His original comment, "Why are we going back to "custom-built" kernel configurations? Why can this not be a loadable module? Distros are now forced to enable these layout and all kernels will have this dead code in the tree without any choice in the matter? That's not ok, these need to be auto-loaded based on the hardware representation like any other kernel module. You can't force them to be always present, sorry. " I have applied most of the patches except nvmem: core: introduce NVMEM layouts nvmem: core: add per-cell post processing nvmem: core: allow to modify a cell before adding it nvmem: imx-ocotp: replace global post processing with layouts nvmem: cell: drop global cell_post_process nvmem: core: provide own priv pointer in post process callback nvmem: layouts: add sl28vpd layout MAINTAINERS: add myself as sl28vpd nvmem layout driver nvmem: layouts: Add ONIE tlv layout driver MAINTAINERS: Add myself as ONIE tlv NVMEM layout maintainer nvmem: core: return -ENOENT if nvmem cell is not found nvmem: layouts: Fix spelling mistake "platforn" -> "platform" dt-bindings: nvmem: Fix spelling mistake "platforn" -> "platform" nvmem: core: fix nvmem_layout_get_match_data() Please rebase your patches on top of nvmem-next once layouts are converted to loadable modules. thanks, srini On 03/01/2023 15:39, Miquel Raynal wrote: > Hi Srinivas, > > michael@walle.cc wrote on Tue, 6 Dec 2022 21:07:19 +0100: > >> This is now the third attempt to fetch the MAC addresses from the VPD >> for the Kontron sl28 boards. Previous discussions can be found here: >> https://lore.kernel.org/lkml/20211228142549.1275412-1-michael@walle.cc/ >> >> >> NVMEM cells are typically added by board code or by the devicetree. But >> as the cells get more complex, there is (valid) push back from the >> devicetree maintainers to not put that handling in the devicetree. >> >> Therefore, introduce NVMEM layouts. They operate on the NVMEM device and >> can add cells during runtime. That way it is possible to add more complex >> cells than it is possible right now with the offset/length/bits >> description in the device tree. For example, you can have post processing >> for individual cells (think of endian swapping, or ethernet offset >> handling). >> >> The imx-ocotp driver is the only user of the global post processing hook, >> convert it to nvmem layouts and drop the global post pocessing hook. >> >> For now, the layouts are selected by the device tree. But the idea is >> that also board files or other drivers could set a layout. Although no >> code for that exists yet. >> >> Thanks to Miquel, the device tree bindings are already approved and merged. >> >> NVMEM layouts as modules? >> While possible in principle, it doesn't make any sense because the NVMEM >> core can't be compiled as a module. The layouts needs to be available at >> probe time. (That is also the reason why they get registered with >> subsys_initcall().) So if the NVMEM core would be a module, the layouts >> could be modules, too. > > I believe this series still applies even though -rc1 (and -rc2) are out > now, may we know if you consider merging it anytime soon or if there > are still discrepancies in the implementation you would like to > discuss? Otherwise I would really like to see this laying in -next a > few weeks before being sent out to Linus, just in case. > > Thanks, > Miquèl