From patchwork Mon Feb 26 02:23:14 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: 10241165 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 6B9F560233 for ; Mon, 26 Feb 2018 02:24:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5F0A32A190 for ; Mon, 26 Feb 2018 02:24:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 533142A195; Mon, 26 Feb 2018 02:24:09 +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 EECDF2A190 for ; Mon, 26 Feb 2018 02:24:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752165AbeBZCX5 (ORCPT ); Sun, 25 Feb 2018 21:23:57 -0500 Received: from mail-pl0-f67.google.com ([209.85.160.67]:38184 "EHLO mail-pl0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751931AbeBZCXu (ORCPT ); Sun, 25 Feb 2018 21:23:50 -0500 Received: by mail-pl0-f67.google.com with SMTP id d4so8425370pll.5 for ; Sun, 25 Feb 2018 18:23:49 -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=Dg/T8kW/A2CkkhhF0OgTJ0Wjgsh9oxMzJy4eRNW+acU=; b=Xq4qE6f9Yf0rPO4rZVHNNKSItl4At3hBEmGHXmr0mT1L2d6yZ9ANmwIY5Km8VSnmaw /RXpi9TuapAXAZVRgLhY36uolPGY9pt8SXGQWgGDdB5ODjLbRRZpo4VUm91ZUxuzfOtc hXleqmajrBnoDo/SKa4bJ6M9Gia6G+6GVvpAw= 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=Dg/T8kW/A2CkkhhF0OgTJ0Wjgsh9oxMzJy4eRNW+acU=; b=qp53Eorjt2AKYKk/Dnnka1yMdHrYpLvi5owaBm/GU3BiTWW133bEDrllFMKB800PRD bsBMD/2FEK0K0GfBuQACDHQfX2sG8G8rhKY2Tk/odjDF+VAFvcH/gvcwa/Xw4lw7KALl yvTB1AhrDPASVSRe7+QkMCw8WC75X/fEG/oevkeSGyq4cwt3FjsFUaubfmAPWbZZrIA6 1bybL0hmSZ8yuwS0wDLczANTFmnxvSblXpFHNbzNahMtkPJBItixlzTIvcsLgH0+H4MT q87wpOmQcCUMn3VMWBD19rExWwWh7E7M9z/IUdylqctEyQ4ODEfkSNZZs1lWxCqVNNs2 tYzw== X-Gm-Message-State: APf1xPBc0La7tg6syMFdSsHOgbe6N/esNxnLwzPQXeM07xcMFEkrCMwz IqQmr351rqMSP/h+e+b0gouJKw== X-Google-Smtp-Source: AH8x2271gkkTccSE7umlei7b6poDKrOCvLLYv9+fPlMPLkasw+xicU0i0RR/MwJy39Pw0oeXSAKHhw== X-Received: by 2002:a17:902:d81:: with SMTP id 1-v6mr7976425plv.324.1519611829624; Sun, 25 Feb 2018 18:23:49 -0800 (PST) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id n12sm12172401pgp.20.2018.02.25.18.23.46 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 25 Feb 2018 18:23:48 -0800 (PST) From: Baolin Wang To: sre@kernel.org Cc: broonie@kernel.org, baolin.wang@linaro.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v4] power: reset: Add Spreadtrum SC27xx PMIC power off support Date: Mon, 26 Feb 2018 10:23:14 +0800 Message-Id: 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 --- Changes since v3: - Add CONFIG_PM_SLEEP_SMP macro to avoid building error. Changes since v2: - Change to build-in this driver. Changes since v1: - Add remove interface. - Add regmap checking when probing the driver. - Add MODULE_ALIAS() --- drivers/power/reset/Kconfig | 9 +++++ drivers/power/reset/Makefile | 1 + drivers/power/reset/sc27xx-poweroff.c | 66 +++++++++++++++++++++++++++++++++ 3 files changed, 76 insertions(+) create mode 100644 drivers/power/reset/sc27xx-poweroff.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index ca0de1a..01543f5 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 + bool "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..65c477e --- /dev/null +++ b/drivers/power/reset/sc27xx-poweroff.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Spreadtrum Communications Inc. + * Copyright (C) 2018 Linaro Ltd. + */ + +#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) +{ +#ifdef CONFIG_PM_SLEEP_SMP + int cpu = smp_processor_id(); + + freeze_secondary_cpus(cpu); +#endif +} + +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) +{ + if (regmap) + return -EINVAL; + + 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", + }, +}; +builtin_platform_driver(sc27xx_poweroff_driver);