From nobody Tue Dec 2 02:05:57 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 10B1516EB42; Thu, 20 Nov 2025 02:42:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763606524; cv=none; b=SdCjguc+4I6J6dH4oZGgJ5tgcRq8cDFoyDeRrnKdppXJQ+CoXJ8ACoZWJ1IrqT30ebxU7WTznv8IF8zLqTnoIvULBQc69/8lwk4/D4UzfnUd/cfFnaZb5zSgMc82EUxCGuJC/cUmiCvYoXFWv92SAjxX+HSLnEkvUBnfdzjJO7c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763606524; c=relaxed/simple; bh=RQA4DSszhtoPx+DkNRc0LnzUIq3VnAKOmWO/RptSvB4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=KdxrY93hTyBOkooqaqcyLohLk91KQiAkgSrtpbA/sXHCclABtgpK1Yz7ZaGsB8+zovkCkZfr7UxvpfgGIWR6YiGAFRiuB18Lmh+o/6iaHKHe0yqawqupPoTS5m0HHfI5n8vlipI7Qx5kHY/JWFJ4FI17MrY8XfhU66ShauxWclY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=a+mLQVSu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="a+mLQVSu" Received: by smtp.kernel.org (Postfix) with ESMTPS id 7F230C4CEF5; Thu, 20 Nov 2025 02:42:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763606523; bh=RQA4DSszhtoPx+DkNRc0LnzUIq3VnAKOmWO/RptSvB4=; h=From:Date:Subject:To:Cc:Reply-To:From; b=a+mLQVSuF6JDeXUW9NOIaMQw3FmyRZCowhxEmnamo3QaZoWTkrUniFnX16xDDWuEF J/I/6zr3gSqCQoNd1/u2zqemtTVTa8JuBFW8rDKA3SUWz8m7Vbn+WTfQBi1XeQ0Tb1 FQ+F8U2slyovGOdp5KXOpXyW6nuDVIoKfyK77zEXinkJwiTZ4AObBFyMATy4ew18GD ilIRjU4UUA0pUAy5QVwWDTQ/UPP1yU6Le7wgkLep9kFMurajYvrFGw32WYtI2qdXAr tjRhA8vuhLMDwZw1gQJDFt5L9FijDmb1SCYGiekcT0367bye2TED31SOpqswaWApvI ed9iY86nluCHw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73451CF58D3; Thu, 20 Nov 2025 02:42:03 +0000 (UTC) From: Kimi Chen via B4 Relay Date: Thu, 20 Nov 2025 10:41:37 +0800 Subject: [PATCH v3] ARM: dts: aspeed: clemente: add gpio line name to io expander Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251120-dts-add-gpio-to-io-expander-v3-1-cb650ac76f85@fii-foxconn.com> X-B4-Tracking: v=1; b=H4sIAOF/HmkC/43NsQqDMBDG8VeRzL1iYqK2U9+jdIjJqTc0kUSCR Xz3RqdCoXQ5+N/w+1YWMRBGdi1WFjBRJO9yVKeCmVG7AYFsbiZKoTgva7BzBG0tDBN5mD3ki8u kncUAWppKGNOrWmuWhSlgT8uh3x+5R4qzD69jLPH9+5+bOHDoZFMrU14EdnjriaD3i/HOnY1/s l1P4lNsfosii6pVVratVErW3+K2bW9A279oHgEAAA== X-Change-ID: 20251106-dts-add-gpio-to-io-expander-a4c32ccf56aa To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Joel Stanley , Andrew Jeffery Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, george.kw.lee@fii-foxconn.com, Kimi Chen X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1763606521; l=2490; i=kimi.zy.chen@fii-foxconn.com; s=20251105; h=from:subject:message-id; bh=LiRNEgcfoucbbjiQuw4XmBH0VHtCLMmaT5yizVx4fo0=; b=bW2nCz1owxiEGjHrPYtrqcOLNEKTMxvDiP9O8iYZnZpW/aqlGnvlIAXLHxGg5ija5EH41Fbqg ZiQnns1CaX9CsYlbxLYUVOqOpvxucRVXF6RCfX2bhGqHTCTbpHfOve2 X-Developer-Key: i=kimi.zy.chen@fii-foxconn.com; a=ed25519; pk=3zHetsW/3CYYIgQlYV9dqSS7aW7aZXLUaIvc+OKr3NM= X-Endpoint-Received: by B4 Relay for kimi.zy.chen@fii-foxconn.com/20251105 with auth_id=559 X-Original-From: Kimi Chen Reply-To: kimi.zy.chen@fii-foxconn.com From: Kimi Chen The chassis power cycle process requires a forced shutdown before cutting off the standby power. The SCM CPLD implements a hard shutdown host function that is controlled through the IO expander in the Clemente platform. This change adds a new GPIO line named "shdn_force_l_cpld" to the PCA9555 IO expander at line 10. When asserted, this GPIO signals the CPLD to pull the HPM's SHDN_FORCE_L pin low, which triggers a forced host shutdown. Signed-off-by: Kimi Chen --- Changes in v3: - Improve commit message clarity: restructure the description to clarify th= e=20 complete signal flow (BMC =E2=86=92 IO expander =E2=86=92 "shdn_force_l_c= pld" GPIO =E2=86=92 CPLD =E2=86=92=20 SHDN_FORCE_L pin =E2=86=92 HPM =E2=86=92 forced host shutdown). - Rename GPIO line to match the schematics net naming convention. - Add rationale: The current standby-AC power cycling process is suboptimal. When HSC power is turned off while host power remains active, the FPGA may detect a power fault. During this fault window, the FPGA=E2=80=94sustaine= d by holdup capacitance=E2=80=94asserts power brake and initiates power-down sequence= . A forced shutdown before cutting standby power ensures the FPGA properly handles t= he AC cycle event without spurious fault assertions. This patch enables the = BMC to perform forced shutdown via the IO expander GPIO, thereby optimizing t= he standby-AC power cycling process. - Link to v2: https://lore.kernel.org/r/20251107-dts-add-gpio-to-io-expande= r-v2-1-585d48845546@fii-foxconn.com Changes in v2: - Add "hard_shutdown_host" GPIO line name to PCA9555 IO expander for Clemen= te platform. - Link to v1: https://lore.kernel.org/r/20251106-dts-add-gpio-to-io-expande= r-v1-1-b4765c092ebe@fii-foxconn.com --- arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts b/ar= ch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts index 450446913e36..14271be4ff3d 100644 --- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts +++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts @@ -983,7 +983,7 @@ io_expander4: gpio@4f { "", "", "", - "", + "shdn_force_l_cpld", "", "", "", --- base-commit: 6953afcd81a2cc73784e3dd23faa0a1aaf97441a change-id: 20251106-dts-add-gpio-to-io-expander-a4c32ccf56aa Best regards, --=20 Kimi Chen