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mfd: tps6594: Add board power-off support

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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: Job Sava <jsava@criticallink.com>
Signed-off-by: Job Sava <jsava@criticallink.com>
Signed-off-by: Michael Walle <mwalle@kernel.org>
Link: https://lore.kernel.org/r/20250826134631.1499936-4-mwalle@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Michael Walle
2025-08-26 15:46:31 +02:00
committed by Lee Jones
parent d766ca01c2
commit 2215a87b02
1 changed files with 20 additions and 0 deletions
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20
drivers/mfd/tps6594-core.c
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@@ -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);