From patchwork Mon Jan 15 07:58:57 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "(Exiting) Baolin Wang" X-Patchwork-Id: 10163249 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AEE3760325 for ; Mon, 15 Jan 2018 07:59:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9A7E028813 for ; Mon, 15 Jan 2018 07:59:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8EBF728844; Mon, 15 Jan 2018 07:59:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2CB7028813 for ; Mon, 15 Jan 2018 07:59:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754394AbeAOH7j (ORCPT ); Mon, 15 Jan 2018 02:59:39 -0500 Received: from mail-pg0-f65.google.com ([74.125.83.65]:36987 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754347AbeAOH7h (ORCPT ); Mon, 15 Jan 2018 02:59:37 -0500 Received: by mail-pg0-f65.google.com with SMTP id z17so7592509pgc.4 for ; Sun, 14 Jan 2018 23:59:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=6iei+w5bTLpya43nD0oXC0eEDmxIiAzMNHuxNkITjDs=; b=BAJVPtUIu+M3VsD2xIagzIOumCymlxbsjZcyxEBkgPPLqYTPki/n1cK5WBCMFXiph9 lqayOlx/SSOSgI+WqBrvQ3KcdiROUd3KB5xPq1JHtJPqeybLP2EYQWIh9IMnmLLnA1HH HC69tYuV79IWqUz/9TBdz8CVXoCi7X+2B9wpU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=6iei+w5bTLpya43nD0oXC0eEDmxIiAzMNHuxNkITjDs=; b=WkdsmwRASh6LDngris21CwNUbQFoIWO4Tja/cJM8nx/kaYxFGSQ0u2ZFfD57nHdMnk RkhtRiUVJzGBow9ConnzCwIryEw2m/WqGwq1HYc1BomjFhRTcyTO8gojmZzXcksMdNx5 /eoJXJ67uepRCJoX8NDBaX+xp3QK9iKGtFJqqa/xsnCGIufE2Kf4Siz+gpZf0SwNVQ6K 7vHlY1iONUcwfJxR6EvraBwbG/ttGq3esx+x/JiAuBfgLH6krKsoQT9ErOzGnvlF/aNd /Hov6nAmYNR5rh/6Ps1ARc6tIoqTx23Qutpv4bWYF2mOSdI9nodtB8UnLhuhy5lnhXSM 7F0w== X-Gm-Message-State: AKwxytdPSGPx84d5S5YwgiVvuelunAPPD4K9zLvyewIvqq89b3ila3yU KTcpgkz9AmYhIXEhZ7/LGqkYeQ== X-Google-Smtp-Source: ACJfBosHb2RcDxJ4WorFMyyXA2EtXT1n/030kHm/7ybMZD0Pi0jcbgdjYiMQwOHRhMSFsYBh8pYBVw== X-Received: by 10.99.170.73 with SMTP id x9mr8864505pgo.393.1516003176663; Sun, 14 Jan 2018 23:59:36 -0800 (PST) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id g69sm13926638pgc.32.2018.01.14.23.59.33 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 14 Jan 2018 23:59:36 -0800 (PST) From: Baolin Wang To: sre@kernel.org Cc: arnd@arndb.de, broonie@kernel.org, baolin.wang@linaro.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH] power: reset: Add Spreadtrum SC27xx PMIC power off support Date: Mon, 15 Jan 2018 15:58:57 +0800 Message-Id: <5822b56a4e65e27183f8bf712d5889b11f90111e.1515118527.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On Spreadtrum platform, we need power off system through external SC27xx series PMICs including the SC2720, SC2721, SC2723, SC2730 and SC2731 chips. Thus this patch adds SC27xx series PMICs power-off support. Signed-off-by: Baolin Wang --- drivers/power/reset/Kconfig | 9 +++++ drivers/power/reset/Makefile | 1 + drivers/power/reset/sc27xx-poweroff.c | 65 +++++++++++++++++++++++++++++++++ 3 files changed, 75 insertions(+) create mode 100644 drivers/power/reset/sc27xx-poweroff.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index ca0de1a..611ae56 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -227,5 +227,14 @@ config SYSCON_REBOOT_MODE register, then the bootloader can read it to take different action according to the mode. +config POWER_RESET_SC27XX + tristate "Spreadtrum SC27xx PMIC power-off driver" + depends on MFD_SC27XX_PMIC || COMPILE_TEST + help + This driver supports powering off a system through + Spreadtrum SC27xx series PMICs. The SC27xx series + PMICs includes the SC2720, SC2721, SC2723, SC2730 + and SC2731 chips. + endif diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index aeb65ed..225d645 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -27,3 +27,4 @@ obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o +obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o diff --git a/drivers/power/reset/sc27xx-poweroff.c b/drivers/power/reset/sc27xx-poweroff.c new file mode 100644 index 0000000..8e4b6a0 --- /dev/null +++ b/drivers/power/reset/sc27xx-poweroff.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2017 Spreadtrum Communications Inc. + * Copyright (c) 2017 Linaro Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define SC27XX_PWR_PD_HW 0xc2c +#define SC27XX_PWR_OFF_EN BIT(0) + +static struct regmap *regmap; + +/* + * On Spreadtrum platform, we need power off system through external SC27xx + * series PMICs, and it is one similar SPI bus mapped by regmap to access PMIC, + * which is not fast io access. + * + * So before stopping other cores, we need release other cores' resource by + * taking cpus down to avoid racing regmap or spi mutex lock when poweroff + * system through PMIC. + */ +void sc27xx_poweroff_shutdown(void) +{ + int cpu = smp_processor_id(); + + freeze_secondary_cpus(cpu); +} + +static struct syscore_ops poweroff_syscore_ops = { + .shutdown = sc27xx_poweroff_shutdown, +}; + +static void sc27xx_poweroff_do_poweroff(void) +{ + regmap_write(regmap, SC27XX_PWR_PD_HW, SC27XX_PWR_OFF_EN); +} + +static int sc27xx_poweroff_probe(struct platform_device *pdev) +{ + regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!regmap) + return -ENODEV; + + pm_power_off = sc27xx_poweroff_do_poweroff; + register_syscore_ops(&poweroff_syscore_ops); + return 0; +} + +static struct platform_driver sc27xx_poweroff_driver = { + .probe = sc27xx_poweroff_probe, + .driver = { + .name = "sc27xx-poweroff", + }, +}; +module_platform_driver(sc27xx_poweroff_driver); + +MODULE_DESCRIPTION("Spreadtrum SC27xx PMIC Poweroff Driver"); +MODULE_LICENSE("GPL v2");