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watchdog: qcom: report WDIOF_POWERUNDER in bootstatus

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On IPQ platforms, identify the restart reason as POWERUNDER, similar to
CARDRESET, and expose it via the bootstatus sysfs interface.

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260728-qcom_wdt_powerunder-v1-1-de8d9e964e7d@oss.qualcomm.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Kathiravan Thirumoorthy 2026-07-28 16:28:02 +05:30 committed by Guenter Roeck
parent 7aa968415c
commit 0595f74ea1
1 changed files with 13 additions and 5 deletions
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18
drivers/watchdog/qcom-wdt.c
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@ -44,6 +44,7 @@ struct qcom_wdt_match_data {
bool pretimeout;
u32 max_tick_count;
u32 wdt_reason_val;
u32 powerunder_reason_val;
};
struct qcom_wdt {
@ -164,7 +165,8 @@ static const struct watchdog_info qcom_wdt_info = {
.options = WDIOF_KEEPALIVEPING
| WDIOF_MAGICCLOSE
| WDIOF_SETTIMEOUT
| WDIOF_CARDRESET,
| WDIOF_CARDRESET
| WDIOF_POWERUNDER,
.identity = KBUILD_MODNAME,
};
@ -173,7 +175,8 @@ static const struct watchdog_info qcom_wdt_pt_info = {
| WDIOF_MAGICCLOSE
| WDIOF_SETTIMEOUT
| WDIOF_PRETIMEOUT
| WDIOF_CARDRESET,
| WDIOF_CARDRESET
| WDIOF_POWERUNDER,
.identity = KBUILD_MODNAME,
};
@ -188,6 +191,7 @@ static const struct qcom_wdt_match_data match_data_ipq5424 = {
.pretimeout = true,
.max_tick_count = 0xFFFFFU,
.wdt_reason_val = 5,
.powerunder_reason_val = 1,
};
static const struct qcom_wdt_match_data match_data_kpss = {
@ -197,12 +201,13 @@ static const struct qcom_wdt_match_data match_data_kpss = {
};
static int qcom_wdt_get_bootstatus(struct device *dev, struct qcom_wdt *wdt,
u32 val)
const struct qcom_wdt_match_data *data)
{
struct device_node *imem;
struct resource res;
void __iomem *addr;
int ret;
int val;
imem = of_parse_phandle(dev->of_node, "sram", 0);
if (!imem) {
@ -222,8 +227,11 @@ static int qcom_wdt_get_bootstatus(struct device *dev, struct qcom_wdt *wdt,
if (!addr)
return -ENOMEM;
if (readl(addr) == val)
val = readl(addr);
if (val == data->wdt_reason_val)
wdt->wdd.bootstatus = WDIOF_CARDRESET;
else if (val == data->powerunder_reason_val)
wdt->wdd.bootstatus = WDIOF_POWERUNDER;
iounmap(addr);
@ -310,7 +318,7 @@ static int qcom_wdt_probe(struct platform_device *pdev)
wdt->wdd.parent = dev;
wdt->layout = data->offset;
ret = qcom_wdt_get_bootstatus(dev, wdt, data->wdt_reason_val);
ret = qcom_wdt_get_bootstatus(dev, wdt, data);
if (ret)
dev_err(dev, "failed to get the bootstatus, %d\n", ret);