From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lelvem-ot01.ext.ti.com (lelvem-ot01.ext.ti.com [198.47.23.234]) (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 6D3CB262A6 for ; Wed, 1 Oct 2025 17:00:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.47.23.234 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759338045; cv=none; b=H1tbILR1JA+En0dVZrId5OM4uvEFmmBN4YmjQ7S5P/2aKCd0wNWzUmnINnKx24ZIm0/u1t3oV0JFl3gz7BMNwe0B9em413szrxBghXd1Q6h/f6WlAOTQj80VAilh5gWK3YBLO1yceLs9GqOdVBlsG7kDyAL2SvKCLiNNgeu+vCM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759338045; c=relaxed/simple; bh=aX12YDPy0rZ1fc/73NvRXtwlL/Vidfv7E1aLrUYFoUE=; h=Date:From:To:CC:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=fL7K0Hda5Igb2PzEXPHhJjCnrhiTOKwQz7SwHaubJhusDRcBmRGlfBZ+04YnmaX/em8v6UIht3a+qSTH/ulot5dcerR4h91KQml33V5i7eTKpbKWsYZmDSUjFvMFSySEmfnThyvqq7bqQldb5cRz4p0XxOe3FcBfJ77Dj2GdWHM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ti.com; spf=pass smtp.mailfrom=ti.com; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b=I3m0RJFl; arc=none smtp.client-ip=198.47.23.234 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ti.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ti.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="I3m0RJFl" Received: from lelvem-sh01.itg.ti.com ([10.180.77.71]) by lelvem-ot01.ext.ti.com (8.15.2/8.15.2) with ESMTP id 591H0bIt2711958; Wed, 1 Oct 2025 12:00:37 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1759338037; bh=ZEODEvpZ+kS569dNngWKxPn7Rdv1MvJZa+IDSy7FiTA=; h=Date:From:To:CC:Subject:References:In-Reply-To; b=I3m0RJFlD4f93M3FuwSB2x20oHw/qeSywDKnYQsGnaP3y4bNteFM+noUb1+nCB20P P0j+alxQNzJDMKH8H1a/lCv9zjyehoceSAoAViHVwntKWl2uCn6CZW18N7B4JWi8/W /7VmsuJC667Zw62FaLxoTbw2fQiu89I5owD7hxRo= Received: from DLEE108.ent.ti.com (dlee108.ent.ti.com [157.170.170.38]) by lelvem-sh01.itg.ti.com (8.18.1/8.18.1) with ESMTPS id 591H0bZg3004851 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA256 bits=128 verify=FAIL); Wed, 1 Oct 2025 12:00:37 -0500 Received: from DLEE215.ent.ti.com (157.170.170.118) by DLEE108.ent.ti.com (157.170.170.38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.55; Wed, 1 Oct 2025 12:00:36 -0500 Received: from lelvem-mr06.itg.ti.com (10.180.75.8) by DLEE215.ent.ti.com (157.170.170.118) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20 via Frontend Transport; Wed, 1 Oct 2025 12:00:36 -0500 Received: from localhost (uda0133052.dhcp.ti.com [128.247.81.232]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 591H0a5v612566; Wed, 1 Oct 2025 12:00:36 -0500 Date: Wed, 1 Oct 2025 12:00:36 -0500 From: Nishanth Menon To: "Markus Schneider-Pargmann (TI.com)" CC: Tero Kristo , Santosh Shilimkar , Vishal Mahaveer , Kevin Hilman , Dhruva Gole , Sebin Francis , Kendall Willis , Akashdeep Kaur , , Subject: Re: [PATCH v8 0/3] firmware: ti_sci: Partial-IO support Message-ID: <20251001170036.favd5zaieknywcch@amendable> References: <20251001-topic-am62-partialio-v6-12-b4-v8-0-76a742605110@baylibre.com> 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="us-ascii" Content-Disposition: inline In-Reply-To: <20251001-topic-am62-partialio-v6-12-b4-v8-0-76a742605110@baylibre.com> X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea On 16:37-20251001, Markus Schneider-Pargmann (TI.com) wrote: > Hi, > > This series adds support for Partial-IO to the ti-sci driver, > implementing the firmware interface necessary to enter this low power > state. It processes the wakeup-source properties from the devicetree and > communicates with the system firmware to enter Partial-IO mode when > appropriate wakeup sources are enabled. > > Partial-IO Overview > ------------------ > Partial-IO is a low power system state in which nearly everything is > turned off except the pins of the CANUART group (mcu_mcan0, mcu_mcan1, > wkup_uart0 and mcu_uart0). These devices can trigger a wakeup of the > system on pin activity. Note that this does not resume the system as the > DDR is off as well. So this state can be considered a power-off state > with wakeup capabilities. > > A documentation can also be found in section 6.2.4 in the TRM: > https://www.ti.com/lit/pdf/spruiv7 > > Implementation Details > ---------------------- > The complete Partial-IO feature requires three coordinated series, each > handling a different aspect of the implementation: > > 1. m_can driver series: Implements device-specific wakeup functionality > for m_can devices, allowing them to be set as wakeup sources. > https://gitlab.baylibre.com/msp8/linux/-/tree/topic/mcan-wakeup-source/v6.17?ref_type=heads > https://lore.kernel.org/r/20250812-topic-mcan-wakeup-source-v6-12-v8-0-6972a810d63b@baylibre.com > > 2. Devicetree series: Defines system states and wakeup sources in the > devicetree for am62, am62a and am62p. > https://gitlab.baylibre.com/msp8/linux/-/tree/topic/am62-dt-partialio/v6.17?ref_type=heads > https://lore.kernel.org/r/20250812-topic-am62-dt-partialio-v6-15-v2-0-25352364a0ac@baylibre.com > > 3. This series (TI-SCI firmware): Implements the firmware interface to > enter Partial-IO mode when appropriate wakeup sources are enabled. If this is the order of dependencies, I guess the series has to wait till CAN driver changes are merged? did I get that right? Also surprised that the DT series is second in the dependency.. usually dts changes occur the last. but anyways.. [...] -- Regards, Nishanth Menon Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D https://ti.com/opensource