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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for a PMIC watchdog timer controlled via Siemens SCU firmware
* extensions. Only useful on some Siemens i.MX8-based platforms as
* special NXP SCFW is needed which provides the needed SCU API.
*
* Copyright (C) 2024 Siemens AG
*/
#include <dm.h>
#include <wdt.h>
#include <firmware/imx/sci/sci.h>
/* watchdog commands */
#define CMD_START_WDT 0x55
#define CMD_STOP_WDT 0x45
#define CMD_PING_WDT 0x35
static int scu_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
{
/* start external watchdog via Timer API */
return sc_timer_control_siemens_pmic_wdog(-1, CMD_START_WDT);
}
static int scu_wdt_stop(struct udevice *dev)
{
/* stop external watchdog via Timer API */
return sc_timer_control_siemens_pmic_wdog(-1, CMD_STOP_WDT);
}
static int scu_wdt_reset(struct udevice *dev)
{
return sc_timer_control_siemens_pmic_wdog(-1, CMD_PING_WDT);
}
static int scu_wdt_probe(struct udevice *dev)
{
debug("%s(dev=%p)\n", __func__, dev);
return 0;
}
static const struct wdt_ops scu_wdt_ops = {
.reset = scu_wdt_reset,
.start = scu_wdt_start,
.stop = scu_wdt_stop,
};
static const struct udevice_id scu_wdt_ids[] = {
{ .compatible = "siemens,scu-wdt" },
{ }
};
U_BOOT_DRIVER(scu_wdt) = {
.name = "scu_wdt",
.id = UCLASS_WDT,
.of_match = scu_wdt_ids,
.probe = scu_wdt_probe,
.ops = &scu_wdt_ops,
};
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