@@ -27,6 +27,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/watchdog.h>
@@ -35,6 +36,7 @@
#define IMX2_WDT_WCR 0x00 /* Control Register */
#define IMX2_WDT_WCR_WT (0xFF << 8) /* -> Watchdog Timeout Field */
+#define IMX2_WDT_WCR_WDW BIT(7) /* -> Watchdog disable for WAIT */
#define IMX2_WDT_WCR_WDA BIT(5) /* -> External Reset WDOG_B */
#define IMX2_WDT_WCR_SRS BIT(4) /* -> Software Reset Signal */
#define IMX2_WDT_WCR_WRE BIT(3) /* -> WDOG Reset Enable */
@@ -60,13 +62,19 @@
#define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8)
+struct imx2_wdt_data {
+ bool wdw_supported;
+};
+
struct imx2_wdt_device {
struct clk *clk;
struct regmap *regmap;
struct watchdog_device wdog;
+ const struct imx2_wdt_data *data;
bool ext_reset;
bool clk_is_on;
bool no_ping;
+ bool sleep_wait;
};
static bool nowayout = WATCHDOG_NOWAYOUT;
@@ -129,6 +137,9 @@ static inline void imx2_wdt_setup(struct watchdog_device *wdog)
/* Suspend timer in low power mode, write once-only */
val |= IMX2_WDT_WCR_WDZST;
+ /* Suspend timer in low power WAIT mode, write once-only */
+ if (wdev->sleep_wait)
+ val |= IMX2_WDT_WCR_WDW;
/* Strip the old watchdog Time-Out value */
val &= ~IMX2_WDT_WCR_WT;
/* Generate internal chip-level reset if WDOG times out */
@@ -292,6 +303,8 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
wdog->max_hw_heartbeat_ms = IMX2_WDT_MAX_TIME * 1000;
wdog->parent = dev;
+ wdev->data = of_device_get_match_data(dev);
+
ret = platform_get_irq(pdev, 0);
if (ret > 0)
if (!devm_request_irq(dev, ret, imx2_wdt_isr, 0,
@@ -313,9 +326,18 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
wdev->ext_reset = of_property_read_bool(dev->of_node,
"fsl,ext-reset-output");
+
+ if (of_property_read_bool(dev->of_node, "fsl,suspend-in-wait")) {
+ if (!wdev->data->wdw_supported) {
+ dev_err(dev, "suspend-in-wait not supported\n");
+ return -EINVAL;
+ }
+ wdev->sleep_wait = true;
+ }
+
/*
* The i.MX7D doesn't support low power mode, so we need to ping the watchdog
- * during suspend.
+ * during suspend. Interaction with "fsl,suspend-in-wait" is unknown!
*/
wdev->no_ping = !of_device_is_compatible(dev->of_node, "fsl,imx7d-wdt");
platform_set_drvdata(pdev, wdog);
@@ -417,9 +439,36 @@ static int __maybe_unused imx2_wdt_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend,
imx2_wdt_resume);
+struct imx2_wdt_data imx_wdt = {
+ .wdw_supported = true,
+};
+
+struct imx2_wdt_data imx_wdt_legacy = {
+ .wdw_supported = false,
+};
+
static const struct of_device_id imx2_wdt_dt_ids[] = {
- { .compatible = "fsl,imx21-wdt", },
- { .compatible = "fsl,imx7d-wdt", },
+ { .compatible = "fsl,imx21-wdt", .data = &imx_wdt_legacy },
+ { .compatible = "fsl,imx25-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx27-wdt", .data = &imx_wdt_legacy },
+ { .compatible = "fsl,imx31-wdt", .data = &imx_wdt_legacy },
+ { .compatible = "fsl,imx35-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx50-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx51-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx53-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx6q-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx6sl-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx6sll-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx6sx-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx6ul-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx7d-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx8mm-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx8mn-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx8mp-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,imx8mq-wdt", .data = &imx_wdt },
+ { .compatible = "fsl,ls1012a-wdt", .data = &imx_wdt_legacy },
+ { .compatible = "fsl,ls1043a-wdt", .data = &imx_wdt_legacy },
+ { .compatible = "fsl,vf610-wdt", .data = &imx_wdt },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx2_wdt_dt_ids);