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Commit 3db47dc0 authored by Robin Gong's avatar Robin Gong Committed by Shawn Guo
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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 <b38343@freescale.com>
Acked-By: default avatarSebastian Reichel <sre@kernel.org>
Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
parent cfd074ad

Documentation/devicetree/bindings/power_supply/imx-snvs-poweroff.txt

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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



Example:

	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>;

		};

	}

drivers/power/reset/Kconfig

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@@ -71,6 +71,15 @@ config POWER_RESET_HISI 
	help

	  Reboot support for Hisilicon boards.



config POWER_RESET_IMX

	bool "IMX6 power-off driver"

	depends on POWER_RESET && SOC_IMX6

	help

	  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.



config POWER_RESET_MSM

	bool "Qualcomm MSM power-off driver"

	depends on ARCH_QCOM

drivers/power/reset/Makefile

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@@ -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

drivers/power/reset/imx-snvs-poweroff.c

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/* 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

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * 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);

}

device_initcall(imx_poweroff_init);