power: reset: imx-snvs-poweroff: add power off driver for i.mx6 (3db47dc0) · Commits · 戴 / test

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);

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