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 X-Spam-Level: X-Spam-Status: No, score=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 693BAECDFB0 for ; Fri, 13 Jul 2018 16:31:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2EB5320854 for ; Fri, 13 Jul 2018 16:31:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2EB5320854 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=glider.be Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387731AbeGMQrI (ORCPT ); Fri, 13 Jul 2018 12:47:08 -0400 Received: from xavier.telenet-ops.be ([195.130.132.52]:53522 "EHLO xavier.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731878AbeGMQrI (ORCPT ); Fri, 13 Jul 2018 12:47:08 -0400 Received: from ayla.of.borg ([84.194.111.163]) by xavier.telenet-ops.be with bizsmtp id AGXh1y00T3XaVaC01GXh2Q; Fri, 13 Jul 2018 18:31:44 +0200 Received: from rox.of.borg ([192.168.97.57]) by ayla.of.borg with esmtp (Exim 4.86_2) (envelope-from ) id 1fe0yr-0003zi-M3; Fri, 13 Jul 2018 18:31:41 +0200 Received: from geert by rox.of.borg with local (Exim 4.90_1) (envelope-from ) id 1fe0Hx-0004mC-Dm; Fri, 13 Jul 2018 17:47:21 +0200 From: Geert Uytterhoeven To: Marek Vasut , Liam Girdwood , Mark Brown Cc: "Rafael J . Wysocki" , Pavel Machek , Len Brown , linux-pm@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v3 0/3] regulator: bd9571mwv: Add support for toggle power switches Date: Fri, 13 Jul 2018 17:47:17 +0200 Message-Id: <20180713154720.18316-1-geert+renesas@glider.be> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, The ROHM BD9571MWV PMIC on the Renesas Salvator-X(S) and ULCB development boards supports DDR Backup Power, which means that the DDR power rails can be kept powered while the main SoC is powered down. This patch series extends the support for DDR backup mode (see commit 6eb0bfae6973eb6a ("regulator: bd9571mwv: Add support for backup mode")) to systems with toggle instead of momentary power switches. With a toggle power switch (or level signal), the following steps must be followed exactly: 1. Configure PMIC for backup mode, which changes the role of the power switch to a wake-up switch, 2. Switch accessory power switch off, to prepare for system suspend, which is a manual step not controlled by software, 3. Suspend system, 4. Switch accessory power switch on, to resume. Unlike on systems with a momentary toggle switch, an additional step 2 must be performed in between step 1 and step 3. Hence step 1 can no longer be handled in the PMIC's suspend callback. This patch series allows performing step 1 when the user writes "on" to the PMIC's "backup_mode" virtual file in sysfs, e.g. echo on > /sys/bus/i2c/drivers/bd9571mwv/*/bd9571mwv-regulator*/backup_mode Conversely, writing "off" reverts the role of the accessory switch to a power switch. Note that unlike with momentary switches, backup mode is not enabled by default, as enabling it prevents the board from being powered off using the power switch, which may confuse the user. Changes compared to v2: - Drop 'PM / wakeup: Add callback for wake-up change notification', - New patch 'regulator: bd9571mwv: Use "backup_mode" sysfs file instead of "wake_up"', - Replace use of "wake_up" sysfs file and extra callback for wake-up change notification by custom "backup_mode" sysfs file, - New patch ;regulator: bd9571mwv: Document "backup_mode" sysfs file'. Changes compared to v1: - Improve patch descriptions, - Drop "return;" at end of function. This has been tested on Salvator-XS. For testing, this series is also available in the topic/bd9571-toggle-power-switch-v3 branch of my renesas-drivers git repository at git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git. Thanks! Geert Uytterhoeven (3): regulator: bd9571mwv: Use "backup_mode" sysfs file instead of "wake_up" regulator: bd9571mwv: Add support for toggle power switches regulator: bd9571mwv: Document "backup_mode" sysfs file .../testing/sysfs-driver-bd9571mwv-regulator | 27 ++++++++ drivers/regulator/bd9571mwv-regulator.c | 69 +++++++++++++++++-- 2 files changed, 90 insertions(+), 6 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-driver-bd9571mwv-regulator -- 2.17.1