Due to commits:
* "ARM: shmobile: Add watchdog support",
* "ARM: shmobile: rcar-gen2: Add watchdog support", and
* "soc: renesas: rcar-rst: Enable watchdog as reset trigger for Gen2",
we now have everything we needed for the watchdog to work on Gen2 and
RZ/G1.
This commit adds "renesas,rcar-gen2-wdt" as compatible string for R-Car
Gen2 and RZ/G1, and since on those platforms the rwdt clock needs to be
always ON, when suspending to RAM we need to explicitly disable the
counting by clearing TME from RWTCSRA.
Signed-off-by: Fabrizio Castro <fabrizio.castro@xxxxxxxxxxxxxx>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@xxxxxxxxxxxxxx>
---
v3->4:
* in this new version the changes to the driver have been splitted into
two commits, this patch takes care of the basic Gen2 support, patch 13/26
takes care of the restart handler.
drivers/watchdog/renesas_wdt.c | 42 +++++++++++++++++++++++++++++++++++++-----
1 file changed, 37 insertions(+), 5 deletions(-)
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 831ef83..0a1a402 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c
@@ -203,13 +203,42 @@ static int rwdt_remove(struct platform_device *pdev)
return 0;
}
-/*
- * This driver does also fit for R-Car Gen2 (r8a779[0-4]) WDT. However, for SMP
- * to work there, one also needs a RESET (RST) driver which does not exist yet
- * due to HW issues. This needs to be solved before adding compatibles here.
- */
+#ifdef CONFIG_PM
+static int rwdt_suspend(struct device *dev)
+{
+ struct platform_device *pdev;
+ struct rwdt_priv *priv;
+
+ pdev = to_platform_device(dev);
+ priv = platform_get_drvdata(pdev);
+ if (watchdog_active(&priv->wdev)) {
+ rwdt_write(priv, priv->cks, RWTCSRA);
+ }
+ return 0;
+}
+
+static int rwdt_resume(struct device *dev)
+{
+ struct platform_device *pdev;
+ struct rwdt_priv *priv;
+
+ pdev = to_platform_device(dev);
+ priv = platform_get_drvdata(pdev);
+ if (watchdog_active(&priv->wdev)) {
+ rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA);
+ }
+ return 0;
+}
+
+static const struct dev_pm_ops rwdt_pm = {
+ .suspend = rwdt_suspend,
+ .resume = rwdt_resume,
+};
+#endif
+
static const struct of_device_id rwdt_ids[] = {
{ .compatible = "renesas,rcar-gen3-wdt", },
+ { .compatible = "renesas,rcar-gen2-wdt", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, rwdt_ids);
@@ -218,6 +247,9 @@ static struct platform_driver rwdt_driver = {
.driver = {
.name = "renesas_wdt",
.of_match_table = rwdt_ids,
+#ifdef CONFIG_PM
+ .pm = &rwdt_pm,
+#endif
},
.probe = rwdt_probe,
.remove = rwdt_remove,
--
2.7.4
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