[PATCH 4/6] watchdog: octeontx_wdt: add get_timeout operation

[Juuso Rinta]

Implement the get_timeout operation for the OcteonTX watchdog driver.

Add a timeout_ms field to the private driver data. octeontx_wdt_start()
stores the timeout after applying overflow clamping.

octeontx_wdt_get_timeout() stores the effective timeout
in the timeout_ms output parameter.

Signed-off-by: Juuso Rinta <juuso.rinta at nokia.com>
---
 drivers/watchdog/octeontx_wdt.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/octeontx_wdt.c b/drivers/watchdog/octeontx_wdt.c
index 7299a9f9739..e1286ac165c 100644
--- a/drivers/watchdog/octeontx_wdt.c
+++ b/drivers/watchdog/octeontx_wdt.c
@@ -31,6 +31,7 @@ struct octeontx_wdt_data {
 struct octeontx_wdt {
 	void __iomem *reg;
 	const struct octeontx_wdt_data *data;
+	u64 timeout_ms;
 	struct clk clk;
 };
 
@@ -38,7 +39,7 @@ static int octeontx_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
 {
 	struct octeontx_wdt *priv = dev_get_priv(dev);
 	u64 clk_rate, val;
-	u64 tout_wdog;
+	u64 tout_wdog, calculated_timeout;
 
 	if (priv->data->has_clk) {
 		clk_rate = clk_get_rate(&priv->clk);
@@ -61,6 +62,11 @@ static int octeontx_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
 	if (tout_wdog >= 0x10000)
 		tout_wdog = 0xffff;
 
+	/* Store calculated timeout in milliseconds for get_timeout */
+	calculated_timeout = (tout_wdog << 8) << priv->data->timer_shift;
+
+	priv->timeout_ms = clk_rate ? calculated_timeout * 1000 / clk_rate : 0;
+
 	val = FIELD_PREP(WDOG_MODE, 0x3) |
 		FIELD_PREP(WDOG_LEN, tout_wdog) |
 		FIELD_PREP(WDOG_CNT, tout_wdog << 8);
@@ -88,6 +94,14 @@ static int octeontx_wdt_expire_now(struct udevice *dev, ulong flags)
 	return 0;
 }
 
+static int octeontx_wdt_get_timeout(struct udevice *dev, u64 *timeout_ms)
+{
+	struct octeontx_wdt *priv = dev_get_priv(dev);
+	*timeout_ms = priv->timeout_ms;
+
+	return 0;
+}
+
 static int octeontx_wdt_reset(struct udevice *dev)
 {
 	struct octeontx_wdt *priv = dev_get_priv(dev);
@@ -142,6 +156,7 @@ static const struct wdt_ops octeontx_wdt_ops = {
 	.start = octeontx_wdt_start,
 	.stop = octeontx_wdt_stop,
 	.expire_now = octeontx_wdt_expire_now,
+	.get_timeout = octeontx_wdt_get_timeout,
 };
 
 static const struct octeontx_wdt_data octeontx_data = {

-- 
2.39.2