Commit 3db47dc0 authored by Robin Gong's avatar Robin Gong Committed by Shawn Guo

power: reset: imx-snvs-poweroff: add power off driver for i.mx6

This driver register pm_power_off with snvs power off function. If
your boards NOT use PMIC_ON_REQ to turn on/off external pmic, or use
other pin to do, please disable the driver in dts, otherwise, your
pm_power_off maybe overwrote by this driver.
Signed-off-by: default avatarRobin Gong <>
Acked-By: default avatarSebastian Reichel <>
Signed-off-by: default avatarShawn Guo <>
parent cfd074ad
i.mx6 Poweroff Driver
SNVS_LPCR in SNVS module can power off the whole system by pull
PMIC_ON_REQ low if PMIC_ON_REQ is connected with external PMIC.
If you don't want to use PMIC_ON_REQ as power on/off control,
please set status='disabled' to disable this driver.
Required Properties:
-compatible: "fsl,sec-v4.0-poweroff"
-reg: Specifies the physical address of the SNVS_LPCR register
snvs@020cc000 {
compatible = "fsl,sec-v4.0-mon", "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0x020cc000 0x4000>;
snvs_poweroff: snvs-poweroff@38 {
compatible = "fsl,sec-v4.0-poweroff";
reg = <0x38 0x4>;
......@@ -71,6 +71,15 @@ config POWER_RESET_HISI
Reboot support for Hisilicon boards.
bool "IMX6 power-off driver"
depends on POWER_RESET && SOC_IMX6
This driver support power off external PMIC by PMIC_ON_REQ on i.mx6
boards.If you want to use other pin to control external power,please
say N here or disable in dts to make sure pm_power_off never be
overwrote wrongly by this driver.
bool "Qualcomm MSM power-off driver"
depends on ARCH_QCOM
......@@ -6,6 +6,7 @@ obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
obj-$(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-$(CONFIG_POWER_RESET_IMX) += imx-snvs-poweroff.o
obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
/* Power off driver for i.mx6
* Copyright (c) 2014, FREESCALE CORPORATION. All rights reserved.
* based on msm-poweroff.c
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
static void __iomem *snvs_base;
static void do_imx_poweroff(void)
u32 value = readl(snvs_base);
/* set TOP and DP_EN bit */
writel(value | 0x60, snvs_base);
static int imx_poweroff_probe(struct platform_device *pdev)
snvs_base = of_iomap(pdev->dev.of_node, 0);
if (!snvs_base) {
dev_err(&pdev->dev, "failed to get memory\n");
return -ENODEV;
pm_power_off = do_imx_poweroff;
return 0;
static const struct of_device_id of_imx_poweroff_match[] = {
{ .compatible = "fsl,sec-v4.0-poweroff", },
MODULE_DEVICE_TABLE(of, of_imx_poweroff_match);
static struct platform_driver imx_poweroff_driver = {
.probe = imx_poweroff_probe,
.driver = {
.name = "imx-snvs-poweroff",
.of_match_table = of_match_ptr(of_imx_poweroff_match),
static int __init imx_poweroff_init(void)
return platform_driver_register(&imx_poweroff_driver);
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