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watchdog: arm_smc_wdt: get wdt status through SMCWD_GET_TIMELEFT

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The optional SMCWD_GET_TIMELEFT command can be used to detect if
the watchdog has already been started.
See the implementation in OP-TEE secure OS [1].

At probe time, check if the watchdog is already started and then
call wdt_set_force_autostart(). This will keep U-Boot pinging the
watchdog even when the property 'u-boot,noautostart' is present.

Link: https://github.com/OP-TEE/optee_os/commit/a7f2d4bd8632 [1]

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Antonio Borneo 2025-05-23 11:46:56 +02:00 committed by Stefan Roese
parent 091303c788
commit 6319fabe32
1 changed files with 17 additions and 0 deletions
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17
drivers/watchdog/arm_smc_wdt.c
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@ -46,6 +46,8 @@ static int smcwd_call(struct udevice *dev, enum smcwd_call call,
return -ENODEV;
if (res->a0 == PSCI_RET_INVALID_PARAMS)
return -EINVAL;
if (res->a0 == PSCI_RET_DISABLED)
return -ENODATA;
if (res->a0 != PSCI_RET_SUCCESS)
return -EIO;
@ -99,6 +101,21 @@ static int smcwd_probe(struct udevice *dev)
priv->min_timeout = res.a1;
priv->max_timeout = res.a2;
/* If already started, then force u-boot to use it */
err = smcwd_call(dev, SMCWD_GET_TIMELEFT, 0, NULL);
switch (err) {
case 0:
dev_dbg(dev, "Already started\n");
wdt_set_force_autostart(dev);
break;
case -ENODATA:
dev_dbg(dev, "Not already started\n");
break;
default:
/* Optional SMCWD_GET_TIMELEFT not implemented */
break;
}
return 0;
}