Commit 2215a87b authored by Michael Walle's avatar Michael Walle Committed by Lee Jones
Browse files

mfd: tps6594: Add board power-off support 



Add a system level power-off handler if the "system-power-controller"
flag is set for this device in the device tree.

A power-off request is triggered by writing the TRIGGER_I2C_0 bit (which
is actually just a convention and really depends on the freely
programmable FSM).

Co-developed-by: default avatarJob Sava <jsava@criticallink.com>
Signed-off-by: default avatarJob Sava <jsava@criticallink.com>
Signed-off-by: default avatarMichael Walle <mwalle@kernel.org>
Link: https://lore.kernel.org/r/20250826134631.1499936-4-mwalle@kernel.org


Signed-off-by: default avatarLee Jones <lee@kernel.org>
parent d766ca01

drivers/mfd/tps6594-core.c

+20 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/interrupt.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/reboot.h>



#include <linux/mfd/core.h>

#include <linux/mfd/tps6594.h>
@@ -688,6 +689,19 @@ static int tps6594_enable_crc(struct tps6594 *tps) 
	return ret;

}



static int tps6594_power_off_handler(struct sys_off_data *data)

{

	struct tps6594 *tps = data->cb_data;

	int ret;



	ret = regmap_update_bits(tps->regmap, TPS6594_REG_FSM_I2C_TRIGGERS,

				 TPS6594_BIT_TRIGGER_I2C(0), TPS6594_BIT_TRIGGER_I2C(0));

	if (ret)

		return notifier_from_errno(ret);



	return NOTIFY_DONE;

}



int tps6594_device_init(struct tps6594 *tps, bool enable_crc)

{

	struct device *dev = tps->dev;
@@ -770,6 +784,12 @@ int tps6594_device_init(struct tps6594 *tps, bool enable_crc) 
			return dev_err_probe(dev, ret, "Failed to add RTC child device\n");

	}



	if (of_device_is_system_power_controller(dev->of_node)) {

		ret = devm_register_power_off_handler(tps->dev, tps6594_power_off_handler, tps);

		if (ret)

			return dev_err_probe(dev, ret, "Failed to register power-off handler\n");

	}



	return 0;

}

EXPORT_SYMBOL_GPL(tps6594_device_init);