Merge tag 'linux-watchdog-5.15-rc1' of git://www.linux-watchdog.org/linux-watchdog

Pull watchdog updates from Wim Van Sebroeck:

 - add Mediatek MT7986 & MT8195 wdt support

 - add Maxim MAX63xx

 - drop bd70528 support

 - rewrite ixp4xx to watchdog framework

 - constify static struct watchdog_ops for sl28cpld_wdt, mpc8xxx_wdt and
   tqmx86

 - introduce watchdog_dev_suspend/resume

 - several fixes and improvements

* tag 'linux-watchdog-5.15-rc1' of git://www.linux-watchdog.org/linux-watchdog:
  dt-bindings: watchdog: Add compatible for Mediatek MT7986
  watchdog: ixp4xx: Rewrite driver to use core
  watchdog: Start watchdog in watchdog_set_last_hw_keepalive only if appropriate
  watchdog: max63xx_wdt: Add device tree probing
  dt-bindings: watchdog: Add Maxim MAX63xx bindings
  watchdog: mediatek: mt8195: add wdt support
  dt-bindings: reset: mt8195: add toprgu reset-controller header file
  watchdog: tqmx86: Constify static struct watchdog_ops
  watchdog: mpc8xxx_wdt: Constify static struct watchdog_ops
  watchdog: sl28cpld_wdt: Constify static struct watchdog_ops
  watchdog: iTCO_wdt: Fix detection of SMI-off case
  watchdog: bcm2835_wdt: consider system-power-controller property
  watchdog: imx2_wdg: notify wdog core to stop ping worker on suspend
  watchdog: introduce watchdog_dev_suspend/resume
  watchdog: Fix NULL pointer dereference when releasing cdev
  watchdog: only run driver set_pretimeout op if device supports it
  watchdog: bd70528 drop bd70528 support

2 files changed, 39 insertions, 0 deletions

diff --git a/include/dt-bindings/reset/mt8195-resets.h b/include/dt-bindings/reset/mt8195-resets.h
new file mode 100644
index 000000000000..a26bccc8b957
--- /dev/null
+++ b/include/dt-bindings/reset/mt8195-resets.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)*/
+/*
+ * Copyright (c) 2021 MediaTek Inc.
+ * Author: Christine Zhu <christine.zhu@mediatek.com>
+ */
+
+#ifndef _DT_BINDINGS_RESET_CONTROLLER_MT8195
+#define _DT_BINDINGS_RESET_CONTROLLER_MT8195
+
+#define MT8195_TOPRGU_CONN_MCU_SW_RST          0
+#define MT8195_TOPRGU_INFRA_GRST_SW_RST        1
+#define MT8195_TOPRGU_APU_SW_RST               2
+#define MT8195_TOPRGU_INFRA_AO_GRST_SW_RST     6
+#define MT8195_TOPRGU_MMSYS_SW_RST             7
+#define MT8195_TOPRGU_MFG_SW_RST               8
+#define MT8195_TOPRGU_VENC_SW_RST              9
+#define MT8195_TOPRGU_VDEC_SW_RST              10
+#define MT8195_TOPRGU_IMG_SW_RST               11
+#define MT8195_TOPRGU_APMIXEDSYS_SW_RST        13
+#define MT8195_TOPRGU_AUDIO_SW_RST             14
+#define MT8195_TOPRGU_CAMSYS_SW_RST            15
+#define MT8195_TOPRGU_EDPTX_SW_RST             16
+#define MT8195_TOPRGU_ADSPSYS_SW_RST           21
+#define MT8195_TOPRGU_DPTX_SW_RST              22
+#define MT8195_TOPRGU_SPMI_MST_SW_RST          23
+
+#define MT8195_TOPRGU_SW_RST_NUM               16
+
+#endif  /* _DT_BINDINGS_RESET_CONTROLLER_MT8195 */
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 9b19e6bb68b5..99660197a36c 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -107,6 +107,7 @@ struct watchdog_device {
 	unsigned int max_hw_heartbeat_ms;
 	struct notifier_block reboot_nb;
 	struct notifier_block restart_nb;
+	struct notifier_block pm_nb;
 	void *driver_data;
 	struct watchdog_core_data *wd_data;
 	unsigned long status;
@@ -116,6 +117,7 @@ struct watchdog_device {
 #define WDOG_STOP_ON_REBOOT	2	/* Should be stopped on reboot */
 #define WDOG_HW_RUNNING		3	/* True if HW watchdog running */
 #define WDOG_STOP_ON_UNREGISTER	4	/* Should be stopped on unregister */
+#define WDOG_NO_PING_ON_SUSPEND	5	/* Ping worker should be stopped on suspend */
 	struct list_head deferred;
 };
 
@@ -156,6 +158,12 @@ static inline void watchdog_stop_on_unregister(struct watchdog_device *wdd)
 	set_bit(WDOG_STOP_ON_UNREGISTER, &wdd->status);
 }
 
+/* Use the following function to stop the wdog ping worker when suspending */
+static inline void watchdog_stop_ping_on_suspend(struct watchdog_device *wdd)
+{
+	set_bit(WDOG_NO_PING_ON_SUSPEND, &wdd->status);
+}
+
 /* Use the following function to check if a timeout value is invalid */
 static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigned int t)
 {
@@ -209,6 +217,8 @@ extern int watchdog_init_timeout(struct watchdog_device *wdd,
 				  unsigned int timeout_parm, struct device *dev);
 extern int watchdog_register_device(struct watchdog_device *);
 extern void watchdog_unregister_device(struct watchdog_device *);
+int watchdog_dev_suspend(struct watchdog_device *wdd);
+int watchdog_dev_resume(struct watchdog_device *wdd);
 
 int watchdog_set_last_hw_keepalive(struct watchdog_device *, unsigned int);