power: reset: remove unused imx-snvs-poweroff driver

There's no user of it in kernel now and it basically functions the same
as the generic syscon-poweroff.c to which we have already switched.
So let's remove it.

Cc: Robin Gong <yibin.gong@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

Documentation/devicetree/bindings/power/reset/imx-snvs-poweroff.txt

-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@20cc000 {
-		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

@@ -98,15 +98,6 @@ 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

@@ -10,7 +10,6 @@ obj-$(CONFIG_POWER_RESET_GEMINI_POWEROFF) += gemini-poweroff.o
 obj-$(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-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
 obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o

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

-/* 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);