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Commit e6a578e2 authored by Vinod Koul's avatar Vinod Koul Committed by Sebastian Reichel
Browse files

power: reset: qcom-pon: Add Qcom PON driver 



Add support Qualcomm PM8xxx PON which is responsible for reboot
mode support.

Co-developed-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.co.uk>
parent ad0e9534

drivers/power/reset/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -104,6 +104,17 @@ config POWER_RESET_MSM 
	help

	  Power off and restart support for Qualcomm boards.



config POWER_RESET_QCOM_PON

	tristate "Qualcomm power-on driver"

	depends on ARCH_QCOM

	depends on MFD_SPMI_PMIC

	select REBOOT_MODE

	help

	  Power On support for Qualcomm boards.

	  If you have a Qualcomm platform and need support for

	  power-on and reboot reason, Say Y.

	  If unsure, Say N.



config POWER_RESET_OCELOT_RESET

	bool "Microsemi Ocelot reset driver"

	depends on MSCC_OCELOT || COMPILE_TEST

drivers/power/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 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_MSM) += msm-poweroff.o

obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o

obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o

obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o

obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o

drivers/power/reset/qcom-pon.c

0 → 100644
+91 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

// Copyright (c) 2017-18 Linaro Limited



#include <linux/delay.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/reboot.h>

#include <linux/reboot-mode.h>

#include <linux/regmap.h>



#define PON_SOFT_RB_SPARE		0x8f



struct pm8916_pon {

	struct device *dev;

	struct regmap *regmap;

	u32 baseaddr;

	struct reboot_mode_driver reboot_mode;

};



static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,

				    unsigned int magic)

{

	struct pm8916_pon *pon = container_of

			(reboot, struct pm8916_pon, reboot_mode);

	int ret;



	ret = regmap_update_bits(pon->regmap,

				 pon->baseaddr + PON_SOFT_RB_SPARE,

				 0xfc, magic << 2);

	if (ret < 0)

		dev_err(pon->dev, "update reboot mode bits failed\n");



	return ret;

}



static int pm8916_pon_probe(struct platform_device *pdev)

{

	struct pm8916_pon *pon;

	int error;



	pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL);

	if (!pon)

		return -ENOMEM;



	pon->dev = &pdev->dev;



	pon->regmap = dev_get_regmap(pdev->dev.parent, NULL);

	if (!pon->regmap) {

		dev_err(&pdev->dev, "failed to locate regmap\n");

		return -ENODEV;

	}



	error = of_property_read_u32(pdev->dev.of_node, "reg",

				     &pon->baseaddr);

	if (error)

		return error;



	pon->reboot_mode.dev = &pdev->dev;

	pon->reboot_mode.write = pm8916_reboot_mode_write;

	error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode);

	if (error) {

		dev_err(&pdev->dev, "can't register reboot mode\n");

		return error;

	}



	platform_set_drvdata(pdev, pon);



	return devm_of_platform_populate(&pdev->dev);

}



static const struct of_device_id pm8916_pon_id_table[] = {

	{ .compatible = "qcom,pm8916-pon" },

	{ }

};

MODULE_DEVICE_TABLE(of, pm8916_pon_id_table);



static struct platform_driver pm8916_pon_driver = {

	.probe = pm8916_pon_probe,

	.driver = {

		.name = "pm8916-pon",

		.of_match_table = of_match_ptr(pm8916_pon_id_table),

	},

};

module_platform_driver(pm8916_pon_driver);



MODULE_DESCRIPTION("pm8916 Power On driver");

MODULE_LICENSE("GPL v2");