On 4/13/22 01:25, Jean-Jacques Hiblot wrote:
From: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
This is a driver for the standard WDT on the RZ/N1 devices. This WDT has
very limited timeout capabilities. However, it can reset the device.
To do so, the corresponding bits in the SysCtrl RSTEN register need to
be enabled. This is not done by this driver.
Signed-off-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@xxxxxxxxxxxxxxx>
Reviewed-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
---
drivers/watchdog/Kconfig | 8 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/rzn1_wdt.c | 203 ++++++++++++++++++++++++++++++++++++
3 files changed, 212 insertions(+)
create mode 100644 drivers/watchdog/rzn1_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index c4e82a8d863f..4d5e503c8950 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -883,6 +883,14 @@ config RENESAS_RZAWDT
This driver adds watchdog support for the integrated watchdogs in the
Renesas RZ/A SoCs. These watchdogs can be used to reset a system.
+config RENESAS_RZN1WDT
+ tristate "Renesas RZ/N1 watchdog"
+ depends on ARCH_RENESAS || COMPILE_TEST
+ select WATCHDOG_CORE
+ help
+ This driver adds watchdog support for the integrated watchdogs in the
+ Renesas RZ/N1 SoCs. These watchdogs can be used to reset a system.
+
config RENESAS_RZG2LWDT
tristate "Renesas RZ/G2L WDT Watchdog"
depends on ARCH_RENESAS || COMPILE_TEST
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index f7da867e8782..38d38564f47b 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -84,6 +84,7 @@ obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o
obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o
obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o
obj-$(CONFIG_RENESAS_RZAWDT) += rza_wdt.o
+obj-$(CONFIG_RENESAS_RZN1WDT) += rzn1_wdt.o
obj-$(CONFIG_RENESAS_RZG2LWDT) += rzg2l_wdt.o
obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o
obj-$(CONFIG_STM32_WATCHDOG) += stm32_iwdg.o
diff --git a/drivers/watchdog/rzn1_wdt.c b/drivers/watchdog/rzn1_wdt.c
new file mode 100644
index 000000000000..fa32716727b7
--- /dev/null
+++ b/drivers/watchdog/rzn1_wdt.c
@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Renesas RZ/N1 Watchdog timer.
+ * This is a 12-bit timer driver from a (62.5/16384) MHz clock. It can't even
+ * cope with 2 seconds.
+ *
+ * Copyright 2018 Renesas Electronics Europe Ltd.
+ *
+ * Derived from Ralink RT288x watchdog timer.
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/watchdog.h>
+
+#define DEFAULT_TIMEOUT 60
+
+#define RZN1_WDT_RETRIGGER 0x0
+#define RZN1_WDT_RETRIGGER_RELOAD_VAL 0
+#define RZN1_WDT_RETRIGGER_RELOAD_VAL_MASK 0xfff
+#define RZN1_WDT_RETRIGGER_PRESCALE BIT(12)
+#define RZN1_WDT_RETRIGGER_ENABLE BIT(13)
+#define RZN1_WDT_RETRIGGER_WDSI (0x2 << 14)
+
+#define RZN1_WDT_PRESCALER 16384
+#define RZN1_WDT_MAX 4095
+
+struct rzn1_watchdog {
+ struct watchdog_device wdtdev;
+ void __iomem *base;
+ unsigned long clk_rate;
Nit: Whenever clk_rate is used, it is divided by 1000.
It might be better to store and use clk_rate_khz instead.
Guenter
