From patchwork Wed Apr 25 09:32:41 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 10362105 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 815FB601D3 for ; Wed, 25 Apr 2018 09:37:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6F70027F54 for ; Wed, 25 Apr 2018 09:37:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 634D828438; Wed, 25 Apr 2018 09:37:43 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, MAILING_LIST_MULTI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id AA62727F54 for ; Wed, 25 Apr 2018 09:37:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=tCkcyTZuVfpVpYUkZ0YpFUJEMdAJx0nL8Rwu9gUpRBs=; b=Ayy//yG9xwlkl9 OkyvSnabeHbBoyg2BwGyYqIKwHXKFiqozmVd1t3ErsgbygF3QBP3la3v/DLjmWx+n6AYckSEfvnpN GEWFOyHyWnQY+PCYGneVOCtKEYFpbLhYy0Sh4vs0RSn9tE+kMitIVE8SMi9UBE3rXo3DW7gv0lgNs /ZrqKysrAgTop7afl/ikVD4iIr8lTPTqma2b6GhbHRLsC7cM4YeL7cR0LCpt/I8pq1sUtAYpfxwO6 lH40Q77ZWKTa2NLuPaM12bM+25sTJRe1VPeqD2ixIEPMOS8UtynhOEc2svoPxSmmP6q59CKicxRkR 5EWrQViU23Q4K/iTEuFg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fBGrp-0002ed-1S; Wed, 25 Apr 2018 09:37:37 +0000 Received: from [210.61.82.183] (helo=mailgw01.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fBGnR-0007ww-KY; Wed, 25 Apr 2018 09:33:09 +0000 X-UUID: e61d2da81a3a4c4da80291b263650eba-20180425 Received: from mtkcas08.mediatek.inc [(172.21.101.126)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1709865228; Wed, 25 Apr 2018 17:32:51 +0800 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs08n2.mediatek.inc (172.21.101.56) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 25 Apr 2018 17:32:50 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1210.3 via Frontend Transport; Wed, 25 Apr 2018 17:32:50 +0800 From: To: , , , , , , , Subject: [PATCH v2 15/17] power: reset: mt6323: add a driver for MT6323 power controller Date: Wed, 25 Apr 2018 17:32:41 +0800 Message-ID: <51d4fbe0d6a22986ddd2df66c9db39aa1eaab74a.1524646231.git.sean.wang@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180425_023305_954422_A4AAAD93 X-CRM114-Status: GOOD ( 18.16 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, Sean Wang , linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sean Wang The power device is responsible for externally down or up the power of the remote MediaTek SoC through the tiny circuit BBPU inside PMIC RTC. Though it's a part of RTC device, it would be better to be a standalone driver than to be a part of existent RTC driver so as to let us make concentration on works about power-controlling topic and to obtain improvements while the subsystem power/reset constantly growing. Currently, the most basic functionality supported is to just power off the system by writing to a special bit field in BBPU register after the system has reached pm_poweroff. Signed-off-by: Sean Wang --- drivers/power/reset/Kconfig | 10 ++++ drivers/power/reset/Makefile | 1 + drivers/power/reset/mt6323-poweroff.c | 97 +++++++++++++++++++++++++++++++++++ include/linux/mfd/mt6397/rtc.h | 1 + 4 files changed, 109 insertions(+) create mode 100644 drivers/power/reset/mt6323-poweroff.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index df58fc8..7b49d71 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -128,6 +128,16 @@ config POWER_RESET_LTC2952 This driver supports an external powerdown trigger and board power down via the LTC2952. Bindings are made in the device tree. +config POWER_RESET_MT6323 + bool "MediaTek MT6323 power-off driver" + depends on MFD_MT6397 + help + The power-off driver is responsible for externally shutdown down + the power of a remote MediaTek SoC MT6323 is connected to through + controlling a tiny circuit BBPU inside MT6323 RTC. + + Say Y if you have a board where MT6323 could be found. + config POWER_RESET_QNAP bool "QNAP power-off driver" depends on OF_GPIO && PLAT_ORION diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 7778c74..8836172 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o +obj-$(CONFIG_POWER_RESET_MT6323) += mt6323-poweroff.o obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o diff --git a/drivers/power/reset/mt6323-poweroff.c b/drivers/power/reset/mt6323-poweroff.c new file mode 100644 index 0000000..c195766 --- /dev/null +++ b/drivers/power/reset/mt6323-poweroff.c @@ -0,0 +1,97 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Power off through MediaTek PMIC + * + * Copyright (C) 2018 MediaTek Inc. + * + * Author: Sean Wang + * + */ + +#include +#include +#include +#include +#include +#include + +struct mt6323_pwrc { + struct device *dev; + struct regmap *regmap; + u32 base; +}; + +static struct mt6323_pwrc *mt_pwrc; + +static void mt6323_do_pwroff(void) +{ + struct mt6323_pwrc *pwrc = mt_pwrc; + unsigned int val; + int ret; + + regmap_write(pwrc->regmap, pwrc->base + RTC_BBPU, RTC_BBPU_KEY); + regmap_write(pwrc->regmap, pwrc->base + RTC_WRTGR, 1); + + ret = regmap_read_poll_timeout(pwrc->regmap, + pwrc->base + RTC_BBPU, val, + !(val & RTC_BBPU_CBUSY), + MTK_RTC_POLL_DELAY_US, + MTK_RTC_POLL_TIMEOUT); + if (ret) + dev_err(pwrc->dev, "failed to write BBPU: %d\n", ret); + + /* Wait some time until system down, otherwise, notice with a warn */ + mdelay(1000); + + WARN_ONCE(1, "Unable to power off system\n"); +} + +static int mt6323_pwrc_probe(struct platform_device *pdev) +{ + struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent); + struct mt6323_pwrc *pwrc; + struct resource *res; + + pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL); + if (!pwrc) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pwrc->base = res->start; + pwrc->regmap = mt6397_chip->regmap; + pwrc->dev = &pdev->dev; + mt_pwrc = pwrc; + + pm_power_off = &mt6323_do_pwroff; + + return 0; +} + +static int mt6323_pwrc_remove(struct platform_device *pdev) +{ + if (pm_power_off == &mt6323_do_pwroff) + pm_power_off = NULL; + + return 0; +} + +static const struct of_device_id mt6323_pwrc_dt_match[] = { + { .compatible = "mediatek,mt6323-pwrc" }, + {}, +}; +MODULE_DEVICE_TABLE(of, mt6323_pwrc_dt_match); + +static struct platform_driver mt6323_pwrc_driver = { + .probe = mt6323_pwrc_probe, + .remove = mt6323_pwrc_remove, + .driver = { + .name = "mt6323-pwrc", + .of_match_table = mt6323_pwrc_dt_match, + }, +}; + +module_platform_driver(mt6323_pwrc_driver); + +MODULE_DESCRIPTION("Poweroff driver for MT6323 PMIC"); +MODULE_AUTHOR("Sean Wang "); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/mt6397/rtc.h b/include/linux/mfd/mt6397/rtc.h index 480977c..ac932c9 100644 --- a/include/linux/mfd/mt6397/rtc.h +++ b/include/linux/mfd/mt6397/rtc.h @@ -16,6 +16,7 @@ #define RTC_BBPU 0x0000 #define RTC_BBPU_CBUSY BIT(6) +#define RTC_BBPU_KEY (0x43 << 8) #define RTC_WRTGR 0x003c