From patchwork Tue Dec 13 22:43:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrizio Castro X-Patchwork-Id: 633781 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55DA7C4708D for ; Tue, 13 Dec 2022 22:44:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236836AbiLMWoO (ORCPT ); Tue, 13 Dec 2022 17:44:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46568 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236798AbiLMWoE (ORCPT ); Tue, 13 Dec 2022 17:44:04 -0500 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D1FFF2314D; Tue, 13 Dec 2022 14:43:47 -0800 (PST) X-IronPort-AV: E=Sophos;i="5.96,242,1665414000"; d="scan'208";a="143229849" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 14 Dec 2022 07:43:47 +0900 Received: from mulinux.home (unknown [10.226.93.1]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 2149140F4527; Wed, 14 Dec 2022 07:43:41 +0900 (JST) From: Fabrizio Castro To: Linus Walleij , Bartosz Golaszewski , Rob Herring , Krzysztof Kozlowski , Sebastian Reichel , Geert Uytterhoeven Cc: Fabrizio Castro , Lee Jones , linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Chris Paterson , Biju Das , linux-renesas-soc@vger.kernel.org, Laurent Pinchart , Jacopo Mondi Subject: [PATCH 5/5] power: reset: Add new driver for RZ/V2M PWC poweroff Date: Tue, 13 Dec 2022 22:43:10 +0000 Message-Id: <20221213224310.543243-6-fabrizio.castro.jz@renesas.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221213224310.543243-1-fabrizio.castro.jz@renesas.com> References: <20221213224310.543243-1-fabrizio.castro.jz@renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The RZ/V2M PWC IP controls external power supplies and therefore can turn the power supplies off when powering down the system. PWC is essentially a Multi-Function Device (MFD), and this driver relies on syscon and simple-mfd to integrate within the larger scheme of things. Signed-off-by: Fabrizio Castro --- drivers/power/reset/Kconfig | 10 +++ drivers/power/reset/Makefile | 1 + drivers/power/reset/rzv2m-pwc-poweroff.c | 81 ++++++++++++++++++++++++ 3 files changed, 92 insertions(+) create mode 100644 drivers/power/reset/rzv2m-pwc-poweroff.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index a8c46ba5878f..9f7c9ed1a36e 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -303,4 +303,14 @@ config POWER_MLXBF help This driver supports reset or low power mode handling for Mellanox BlueField. +config POWER_RESET_RZV2M_PWC + tristate "Renesas RZ/V2M PWC Power OFF" + depends on MFD_SYSCON + depends on ARCH_R9A09G011 || COMPILE_TEST + help + The RZ/V2M PWC IP controls external power supplies and therefore can + turn the power supplies off when powering down the system. + Enable this driver when PWC is in control of the system power supplies + and it's the preferred way to shutdown the system. + endif diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 0a39424fc558..f05a8abff2eb 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -36,3 +36,4 @@ obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o obj-$(CONFIG_NVMEM_REBOOT_MODE) += nvmem-reboot-mode.o obj-$(CONFIG_POWER_MLXBF) += pwr-mlxbf.o +obj-$(CONFIG_POWER_RESET_RZV2M_PWC) += rzv2m-pwc-poweroff.o diff --git a/drivers/power/reset/rzv2m-pwc-poweroff.c b/drivers/power/reset/rzv2m-pwc-poweroff.c new file mode 100644 index 000000000000..e9bd16e65b6a --- /dev/null +++ b/drivers/power/reset/rzv2m-pwc-poweroff.c @@ -0,0 +1,81 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2022 Renesas Electronics Corporation + * + * Reset driver for Renesas RZ/V2M External Power Sequence Controller (PWC) + */ + +#include +#include +#include +#include +#include + +#define PWC_PWCRST 0x00 +#define PWC_PWCCKEN 0x04 +#define PWC_PWCCTL 0x50 + +#define PWC_PWCRST_RSTSOFTAX 0x1 +#define PWC_PWCCKEN_ENGCKMAIN 0x1 +#define PWC_PWCCTL_PWOFF 0x1 + +struct rzv2m_pwc_poweroff_priv { + struct regmap *regmap; + struct device *dev; +}; + +static int rzv2m_pwc_poweroff(struct sys_off_data *data) +{ + struct rzv2m_pwc_poweroff_priv *priv = + (struct rzv2m_pwc_poweroff_priv *)data->cb_data; + + regmap_write(priv->regmap, PWC_PWCRST, PWC_PWCRST_RSTSOFTAX); + regmap_write(priv->regmap, PWC_PWCCKEN, PWC_PWCCKEN_ENGCKMAIN); + regmap_write(priv->regmap, PWC_PWCCTL, PWC_PWCCTL_PWOFF); + + mdelay(150); + + dev_err(priv->dev, "Failed to power off the system"); + + return NOTIFY_DONE; +} + +static int rzv2m_pwc_poweroff_probe(struct platform_device *pdev) +{ + struct rzv2m_pwc_poweroff_priv *priv; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, + "regmap"); + + if (IS_ERR(priv->regmap)) + return dev_err_probe(&pdev->dev, PTR_ERR(priv->regmap), + "Can't find regmap property"); + + priv->dev = &pdev->dev; + + return devm_register_power_off_handler(&pdev->dev, rzv2m_pwc_poweroff, + priv); +} + +static const struct of_device_id rzv2m_pwc_poweroff_of_match[] = { + { .compatible = "renesas,rzv2m-pwc-poweroff" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rzv2m_pwc_poweroff_of_match); + +static struct platform_driver rzv2m_pwc_poweroff_driver = { + .probe = rzv2m_pwc_poweroff_probe, + .driver = { + .name = "rzv2m_pwc_poweroff", + .of_match_table = of_match_ptr(rzv2m_pwc_poweroff_of_match), + }, +}; +module_platform_driver(rzv2m_pwc_poweroff_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Fabrizio Castro "); +MODULE_DESCRIPTION("Renesas RZ/V2M PWC power OFF driver");