Cover Letter Detail
Show a cover letter.
GET /api/covers/2196234/?format=api
{ "id": 2196234, "url": "http://patchwork.ozlabs.org/api/covers/2196234/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/cover/20260213-pinctrl-single-bit-v1-0-c60f2fb80efb@aspeedtech.com/", "project": { "id": 42, "url": "http://patchwork.ozlabs.org/api/projects/42/?format=api", "name": "Linux GPIO development", "link_name": "linux-gpio", "list_id": "linux-gpio.vger.kernel.org", "list_email": "linux-gpio@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260213-pinctrl-single-bit-v1-0-c60f2fb80efb@aspeedtech.com>", "list_archive_url": null, "date": "2026-02-13T08:17:41", "name": "[RFC,0/2] pinctrl: add syscon-backed packed-field pinctrl driver and DT bindings", "submitter": { "id": 80235, "url": "http://patchwork.ozlabs.org/api/people/80235/?format=api", "name": "Billy Tsai", "email": "billy_tsai@aspeedtech.com" }, "mbox": "http://patchwork.ozlabs.org/project/linux-gpio/cover/20260213-pinctrl-single-bit-v1-0-c60f2fb80efb@aspeedtech.com/mbox/", "series": [ { "id": 492065, "url": "http://patchwork.ozlabs.org/api/series/492065/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/list/?series=492065", "date": "2026-02-13T08:17:41", "name": "pinctrl: add syscon-backed packed-field pinctrl driver and DT bindings", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492065/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2196234/comments/", "headers": { "Return-Path": "\n <linux-gpio+bounces-31649-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-gpio@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; helo=sin.lore.kernel.org;\n envelope-from=linux-gpio+bounces-31649-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)", "smtp.subspace.kernel.org;\n arc=none smtp.client-ip=211.20.114.72", "smtp.subspace.kernel.org;\n dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com", "smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=aspeedtech.com" ], "Received": [ "from sin.lore.kernel.org (sin.lore.kernel.org\n [IPv6:2600:3c15:e001:75::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fC4mr1nRSz1xpY\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 13 Feb 2026 19:18:20 +1100 (AEDT)", "from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sin.lore.kernel.org (Postfix) with ESMTP id 698993014887\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 13 Feb 2026 08:18:09 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 5A8213161A2;\n\tFri, 13 Feb 2026 08:18:06 +0000 (UTC)", "from TWMBX01.aspeed.com (mail.aspeedtech.com [211.20.114.72])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id D9FAA29D269;\n\tFri, 13 Feb 2026 08:18:03 +0000 (UTC)", "from TWMBX01.aspeed.com (192.168.0.62) by TWMBX01.aspeed.com\n (192.168.0.62) with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1748.10; Fri, 13 Feb\n 2026 16:17:55 +0800", "from [127.0.1.1] (192.168.10.13) by TWMBX01.aspeed.com\n (192.168.0.62) with Microsoft SMTP Server id 15.2.1748.10 via Frontend\n Transport; Fri, 13 Feb 2026 16:17:55 +0800" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1770970686; cv=none;\n b=NgQl+8T4RiAdRpgsC4uTiYyrVFGnNaCJrbmc2qpG6eAc/n4LZY8ZoTnoCGT5nclzIjOM0HoFZUvpY7OzPMgUIRt+6XVbQ/XMf5RHgq0NhDYh8WFke7fMjZcVvRDPXD2WBVE58iBTDCYwlC1ffAaAyMwqcu3vESgMEZoPhF+8jm4=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1770970686; c=relaxed/simple;\n\tbh=GyucnYRddM+KPEwtfmXcesurg0IS8btBZhDNqZcs91M=;\n\th=From:Subject:Date:Message-ID:MIME-Version:Content-Type:To:CC;\n b=BC2UziZeQzgsaMvFHhI78zuxHeR6zzUFjzhqF0OPZdidnfUq5101TVMMiPR38+7AprQo3Xka0Ldi9b0e8ABz/h4o0XpGN1xG83GUZVTXc9uo9EImoK4xrSXCGrkhpiF/kqhNjhw7buBxS+uMev6g5v4wvIe/zehd4A5ddphZC2g=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com;\n spf=pass smtp.mailfrom=aspeedtech.com; arc=none smtp.client-ip=211.20.114.72", "From": "Billy Tsai <billy_tsai@aspeedtech.com>", "Subject": "[PATCH RFC 0/2] pinctrl: add syscon-backed packed-field pinctrl\n driver and DT bindings", "Date": "Fri, 13 Feb 2026 16:17:41 +0800", "Message-ID": "<20260213-pinctrl-single-bit-v1-0-c60f2fb80efb@aspeedtech.com>", "Precedence": "bulk", "X-Mailing-List": "linux-gpio@vger.kernel.org", "List-Id": "<linux-gpio.vger.kernel.org>", "List-Subscribe": "<mailto:linux-gpio+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-gpio+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "X-B4-Tracking": "v=1; b=H4sIACXejmkC/x3MwQpAQBCA4VfRnE3ZEeGqPICrHNgdTGlpV1Lad\n 7c5fof/f8GzE/bQJC84vsXLYSNUmoDeJrsyiokGyqjMSCk8xerL7ejFrjvjLBeaiVS+UEW6LiC\n Gp+NFnn86QN+1MIbwAdRy5kxpAAAA", "X-Change-ID": "20260211-pinctrl-single-bit-da213f282c95", "To": "Linus Walleij <linusw@kernel.org>, Tony Lindgren <tony@atomide.com>, \"Rob\n Herring\" <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>, \"Conor\n Dooley\" <conor+dt@kernel.org>, Joel Stanley <joel@jms.id.au>, Andrew Jeffery\n\t<andrew@codeconstruct.com.au>, Bartosz Golaszewski <brgl@kernel.org>", "CC": "<patrickw3@meta.com>, <linux-gpio@vger.kernel.org>,\n\t<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,\n\t<linux-arm-kernel@lists.infradead.org>, <linux-aspeed@lists.ozlabs.org>,\n\t<BMC-SW@aspeedtech.com>, Billy Tsai <billy_tsai@aspeedtech.com>", "X-Mailer": "b4 0.14.3", "X-Developer-Signature": "v=1; a=ed25519-sha256; t=1770970675; l=2131;\n i=billy_tsai@aspeedtech.com; s=20251118; h=from:subject:message-id;\n bh=GyucnYRddM+KPEwtfmXcesurg0IS8btBZhDNqZcs91M=;\n b=wnr8PkYCiaj6qIxDNo2bobprHQFZzxKZe4ITj4bP2A7etp7tWDxgaI1FFV0ZkCF8v/Mzh9EvQ\n i9jFMJZ6T+wBt80YTsSiVUTiqGAEBSJYEh8C4XVx4HGcMDlWw2KJ+jV", "X-Developer-Key": "i=billy_tsai@aspeedtech.com; a=ed25519;\n pk=/A8qvgZ6CPfnwKgT6/+k+nvXOkN477MshEGJvVdzeeQ=" }, "content": "This work follows earlier review discussions around extending\npinctrl-single for bit-per-mux / packed-field controllers. Based on\nfeedback from Linus Walleij and Tony Lindgren, the direction was changed\ntowards introducing a separate targeted driver instead of further\nincreasing the complexity of pinctrl-single.\n\nThe prior pinctrl-single series is at:\nhttps://lore.kernel.org/all/20260123-upstream_pinctrl_single-v2-0-40f8063cc5a2@aspeedtech.com/\n\nThis series is a replacement of that approach., targeted pinctrl driver\nfor controllers where pinmux and/or pin configuration are represented as\nfixed-width fields packed sequentially within shared registers\n(packed-field / bit-per-pin style controllers).\n\nAlthough pinctrl-single contains support for some bit-per-mux use cases,\nit was originally designed around direct MMIO ownership and has grown\nin complexity over time. For SoCs where the pin controller lives inside\na larger SCU/syscon register block, using syscon + regmap-mmio provides\na clearer ownership model and naturally avoids MMIO resource conflicts.\n\nThe new driver is designed to be instantiated as a subnode of a syscon\ndevice (e.g. SCU). It obtains a regmap from the parent and uses the\nchild node 'reg' as a window into the syscon register space.\n\nThis series includes:\n 1. A generic Devicetree binding for packed-field pin controllers.\n 2. The new pinctrl-packed driver (derived from pinctrl-single).\n\nSigned-off-by: Billy Tsai <billy_tsai@aspeedtech.com>\n---\nBilly Tsai (2):\n dt-bindings: pinctrl: Add pinctrl-packed\n pinctrl: add syscon-backed packed-field pin controller driver\n\n .../bindings/pinctrl/pinctrl-packed.yaml | 166 +++\n drivers/pinctrl/Kconfig | 13 +\n drivers/pinctrl/Makefile | 1 +\n drivers/pinctrl/pinctrl-packed.c | 1168 ++++++++++++++++++++\n 4 files changed, 1348 insertions(+)\n---\nbase-commit: ea24857a76ad90632f86f1e8c8465f96c9f2e407\nchange-id: 20260211-pinctrl-single-bit-da213f282c95\n\nBest regards," }