Merge tag 'linux-watchdog-6.5-rc1' of git://www.linux-watchdog.org/linux-watchdog

Pull watchdog updates from Wim Van Sebroeck:

 - add Xilinx Versal watchdog

 - support Hygon FCH/SCH (Server Controller Hub)

 - convert GPL notices to SPDX identifiers

 - other improvements

* tag 'linux-watchdog-6.5-rc1' of git://www.linux-watchdog.org/linux-watchdog:
  watchdog: sp5100_tco: support Hygon FCH/SCH (Server Controller Hub)
  dt-bindings: watchdog: restrict node name suffixes
  MAINTAINERS: Add support for Xilinx versal watchdog
  watchdog: xilinx_wwdt: Add Versal window watchdog support
  dt-bindings: watchdog: xlnx,versal-wwdt: Add versal watchdog
  watchdog: ziirave_wdt: Switch i2c driver back to use .probe()
  watchdog: ibmasr: Replace GPL license notice with SPDX identifier
  watchdog: Convert GPL 2.0 notice to SPDX identifier
  watchdog: loongson1_wdt: Add DT support

Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml

@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/xlnx,versal-wwdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx Versal window watchdog timer controller
+
+maintainers:
+  - Neeli Srinivas <srinivas.neeli@amd.com>
+
+description:
+  Versal watchdog intellectual property uses window watchdog mode.
+  Window watchdog timer(WWDT) contains closed(first) and open(second)
+  window with 32 bit width. Write to the watchdog timer within
+  predefined window periods of time. This means a period that is not
+  too soon and a period that is not too late. The WWDT has to be
+  restarted within the open window time. If software tries to restart
+  WWDT outside of the open window time period, it generates a reset.
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    enum:
+      - xlnx,versal-wwdt
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    watchdog@fd4d0000 {
+        compatible = "xlnx,versal-wwdt";
+        reg = <0xfd4d0000 0x10000>;
+        clocks = <&clock25>;
+        timeout-sec = <30>;
+    };
+...

MAINTAINERS

@@ -23460,8 +23460,10 @@ M:	Srinivas Neeli <srinivas.neeli@amd.com>
 R:	Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
 R:	Michal Simek <michal.simek@amd.com>
 S:	Maintained
+F:	Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
 F:	Documentation/devicetree/bindings/watchdog/xlnx,xps-timebase-wdt.yaml
 F:	drivers/watchdog/of_xilinx_wdt.c
+F:	drivers/watchdog/xilinx_wwdt.c
 
 XILINX XDMA DRIVER
 M:	Lizhi Hou <lizhi.hou@amd.com>

drivers/watchdog/Kconfig

@@ -304,6 +304,24 @@ config XILINX_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called of_xilinx_wdt.
 
+config XILINX_WINDOW_WATCHDOG
+	tristate "Xilinx window watchdog timer"
+	depends on HAS_IOMEM
+	depends on ARM64
+	select WATCHDOG_CORE
+	help
+	  Window watchdog driver for the versal_wwdt IP core.
+	  Window watchdog timer(WWDT) contains closed(first) and
+	  open(second) window with 32 bit width. Write to the watchdog
+	  timer within predefined window periods of time. This means
+	  a period that is not too soon and a period that is not too
+	  late. The WWDT has to be restarted within the open window time.
+	  If software tries to restart WWDT outside of the open window
+	  time period, it generates a reset.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called xilinx_wwdt.
+
 config ZIIRAVE_WATCHDOG
 	tristate "Zodiac RAVE Watchdog Timer"
 	depends on I2C

drivers/watchdog/Makefile

@@ -157,6 +157,7 @@ obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o
 
 # MicroBlaze Architecture
 obj-$(CONFIG_XILINX_WATCHDOG) += of_xilinx_wdt.o
+obj-$(CONFIG_XILINX_WINDOW_WATCHDOG) += xilinx_wwdt.o
 
 # MIPS Architecture
 obj-$(CONFIG_ATH79_WDT) += ath79_wdt.o

drivers/watchdog/ep93xx_wdt.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Watchdog driver for Cirrus Logic EP93xx family of devices.
  *
@@ -11,10 +12,6 @@
  * Copyright (c) 2012 H Hartley Sweeten <hsweeten@visionengravers.com>
  *	Convert to a platform device and use the watchdog framework API
  *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- *
  * This watchdog fires after 250msec, which is a too short interval
  * for us to rely on the user space daemon alone. So we ping the
  * wdt each ~200msec and eventually stop doing it if the user space

drivers/watchdog/ibmasr.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-1.0+
 /*
  * IBM Automatic Server Restart driver.
  *
@@ -6,8 +7,6 @@
  * Based on driver written by Pete Reynolds.
  * Copyright (c) IBM Corporation, 1998-2004.
  *
- * This software may be used and distributed according to the terms
- * of the GNU Public License, incorporated herein by reference.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

drivers/watchdog/loongson1_wdt.c

@@ -5,6 +5,7 @@
 
 #include <linux/clk.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/watchdog.h>
 
@@ -112,7 +113,7 @@ static int ls1x_wdt_probe(struct platform_device *pdev)
 	if (IS_ERR(drvdata->base))
 		return PTR_ERR(drvdata->base);
 
-	drvdata->clk = devm_clk_get_enabled(dev, pdev->name);
+	drvdata->clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(drvdata->clk))
 		return PTR_ERR(drvdata->clk);
 
@@ -144,10 +145,20 @@ static int ls1x_wdt_probe(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id ls1x_wdt_dt_ids[] = {
+	{ .compatible = "loongson,ls1b-wdt", },
+	{ .compatible = "loongson,ls1c-wdt", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ls1x_wdt_dt_ids);
+#endif
+
 static struct platform_driver ls1x_wdt_driver = {
 	.probe = ls1x_wdt_probe,
 	.driver = {
 		.name = "ls1x-wdt",
+		.of_match_table = of_match_ptr(ls1x_wdt_dt_ids),
 	},
 };
 

drivers/watchdog/m54xx_wdt.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * drivers/watchdog/m54xx_wdt.c
  *
@@ -11,9 +12,6 @@
  *  Copyright 2004 (c) MontaVista, Software, Inc.
  *  Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
  *
- * This file is licensed under  the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

drivers/watchdog/max63xx_wdt.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * drivers/char/watchdog/max63xx_wdt.c
  *
@@ -5,10 +6,6 @@
  *
  * Copyright (C) 2009 Marc Zyngier <maz@misterjones.org>
  *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- *
  * This driver assumes the watchdog pins are memory mapped (as it is
  * the case for the Arcom Zeus). Should it be connected over GPIOs or
  * another interface, some abstraction will have to be introduced.

drivers/watchdog/moxart_wdt.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * MOXA ART SoCs watchdog driver.
  *
@@ -5,9 +6,6 @@
  *
  * Jonas Jensen <jonas.jensen@gmail.com>
  *
- * This file is licensed under the terms of the GNU General Public
- * License version 2.  This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #include <linux/clk.h>

drivers/watchdog/octeon-wdt-nmi.S

@@ -1,8 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
  * Copyright (C) 2007-2017 Cavium, Inc.
  */
 #include <asm/asm.h>

drivers/watchdog/orion_wdt.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * drivers/watchdog/orion_wdt.c
  *
@@ -5,9 +6,6 @@
  *
  * Author: Sylver Bruneau <sylver.bruneau@googlemail.com>
  *
- * This file is licensed under  the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

drivers/watchdog/rtd119x_wdt.c

@@ -1,9 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Realtek RTD129x watchdog
  *
  * Copyright (c) 2017 Andreas Färber
  *
- * SPDX-License-Identifier: GPL-2.0+
  */
 
 #include <linux/bitops.h>

drivers/watchdog/sbc_fitpc2_wdt.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Watchdog driver for SBC-FITPC2 board
  *
@@ -5,9 +6,6 @@
  *
  * Adapted from the IXP2000 watchdog driver by Deepak Saxena.
  *
- * This file is licensed under  the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME " WATCHDOG: " fmt

drivers/watchdog/sp5100_tco.c

@@ -96,7 +96,7 @@ static enum tco_reg_layout tco_reg_layout(struct pci_dev *dev)
 	    sp5100_tco_pci->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
 	    sp5100_tco_pci->revision >= AMD_ZEN_SMBUS_PCI_REV) {
 		return efch_mmio;
-	} else if (dev->vendor == PCI_VENDOR_ID_AMD &&
+	} else if ((dev->vendor == PCI_VENDOR_ID_AMD || dev->vendor == PCI_VENDOR_ID_HYGON) &&
 	    ((dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
 	     dev->revision >= 0x41) ||
 	    (dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
@@ -579,6 +579,8 @@ static const struct pci_device_id sp5100_tco_pci_tbl[] = {
 	  PCI_ANY_ID, },
 	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, PCI_ANY_ID,
 	  PCI_ANY_ID, },
+	{ PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, PCI_ANY_ID,
+	  PCI_ANY_ID, },
 	{ 0, },			/* End of list */
 };
 MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);

drivers/watchdog/ts4800_wdt.c

@@ -1,11 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Watchdog driver for TS-4800 based boards
  *
  * Copyright (c) 2015 - Savoir-faire Linux
  *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #include <linux/kernel.h>

drivers/watchdog/ts72xx_wdt.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Watchdog driver for Technologic Systems TS-72xx based SBCs
  * (TS-7200, TS-7250 and TS-7260). These boards have external
@@ -8,9 +9,6 @@
  *
  * This driver is based on ep93xx_wdt and wm831x_wdt drivers.
  *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #include <linux/platform_device.h>

drivers/watchdog/xilinx_wwdt.c

@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Window watchdog device driver for Xilinx Versal WWDT
+ *
+ * Copyright (C) 2022 - 2023, Advanced Micro Devices, Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/watchdog.h>
+
+/* Max timeout is calculated at 100MHz source clock */
+#define XWWDT_DEFAULT_TIMEOUT	42
+#define XWWDT_MIN_TIMEOUT	1
+
+/* Register offsets for the WWDT device */
+#define XWWDT_MWR_OFFSET	0x00
+#define XWWDT_ESR_OFFSET	0x04
+#define XWWDT_FCR_OFFSET	0x08
+#define XWWDT_FWR_OFFSET	0x0c
+#define XWWDT_SWR_OFFSET	0x10
+
+/* Master Write Control Register Masks */
+#define XWWDT_MWR_MASK		BIT(0)
+
+/* Enable and Status Register Masks */
+#define XWWDT_ESR_WINT_MASK	BIT(16)
+#define XWWDT_ESR_WSW_MASK	BIT(8)
+#define XWWDT_ESR_WEN_MASK	BIT(0)
+
+#define XWWDT_CLOSE_WINDOW_PERCENT	50
+
+static int wwdt_timeout;
+static int closed_window_percent;
+
+module_param(wwdt_timeout, int, 0);
+MODULE_PARM_DESC(wwdt_timeout,
+		 "Watchdog time in seconds. (default="
+		 __MODULE_STRING(XWWDT_DEFAULT_TIMEOUT) ")");
+module_param(closed_window_percent, int, 0);
+MODULE_PARM_DESC(closed_window_percent,
+		 "Watchdog closed window percentage. (default="
+		 __MODULE_STRING(XWWDT_CLOSE_WINDOW_PERCENT) ")");
+/**
+ * struct xwwdt_device - Watchdog device structure
+ * @base: base io address of WDT device
+ * @spinlock: spinlock for IO register access
+ * @xilinx_wwdt_wdd: watchdog device structure
+ * @freq: source clock frequency of WWDT
+ * @close_percent: Closed window percent
+ */
+struct xwwdt_device {
+	void __iomem *base;
+	spinlock_t spinlock; /* spinlock for register handling */
+	struct watchdog_device xilinx_wwdt_wdd;
+	unsigned long freq;
+	u32 close_percent;
+};
+
+static int xilinx_wwdt_start(struct watchdog_device *wdd)
+{
+	struct xwwdt_device *xdev = watchdog_get_drvdata(wdd);
+	struct watchdog_device *xilinx_wwdt_wdd = &xdev->xilinx_wwdt_wdd;
+	u64 time_out, closed_timeout, open_timeout;
+	u32 control_status_reg;
+
+	/* Calculate timeout count */
+	time_out = xdev->freq * wdd->timeout;
+	closed_timeout = (time_out * xdev->close_percent) / 100;
+	open_timeout = time_out - closed_timeout;
+	wdd->min_hw_heartbeat_ms = xdev->close_percent * 10 * wdd->timeout;
+
+	spin_lock(&xdev->spinlock);
+
+	iowrite32(XWWDT_MWR_MASK, xdev->base + XWWDT_MWR_OFFSET);
+	iowrite32(~(u32)XWWDT_ESR_WEN_MASK, xdev->base + XWWDT_ESR_OFFSET);
+	iowrite32((u32)closed_timeout, xdev->base + XWWDT_FWR_OFFSET);
+	iowrite32((u32)open_timeout, xdev->base + XWWDT_SWR_OFFSET);
+
+	/* Enable the window watchdog timer */
+	control_status_reg = ioread32(xdev->base + XWWDT_ESR_OFFSET);
+	control_status_reg |= XWWDT_ESR_WEN_MASK;
+	iowrite32(control_status_reg, xdev->base + XWWDT_ESR_OFFSET);
+
+	spin_unlock(&xdev->spinlock);
+
+	dev_dbg(xilinx_wwdt_wdd->parent, "Watchdog Started!\n");
+
+	return 0;
+}
+
+static int xilinx_wwdt_keepalive(struct watchdog_device *wdd)
+{
+	struct xwwdt_device *xdev = watchdog_get_drvdata(wdd);
+	u32 control_status_reg;
+
+	spin_lock(&xdev->spinlock);
+
+	/* Enable write access control bit for the window watchdog */
+	iowrite32(XWWDT_MWR_MASK, xdev->base + XWWDT_MWR_OFFSET);
+
+	/* Trigger restart kick to watchdog */
+	control_status_reg = ioread32(xdev->base + XWWDT_ESR_OFFSET);
+	control_status_reg |= XWWDT_ESR_WSW_MASK;
+	iowrite32(control_status_reg, xdev->base + XWWDT_ESR_OFFSET);
+
+	spin_unlock(&xdev->spinlock);
+
+	return 0;
+}
+
+static const struct watchdog_info xilinx_wwdt_ident = {
+	.options = WDIOF_KEEPALIVEPING |
+		WDIOF_SETTIMEOUT,
+	.firmware_version = 1,
+	.identity = "xlnx_window watchdog",
+};
+
+static const struct watchdog_ops xilinx_wwdt_ops = {
+	.owner = THIS_MODULE,
+	.start = xilinx_wwdt_start,
+	.ping = xilinx_wwdt_keepalive,
+};
+
+static int xwwdt_probe(struct platform_device *pdev)
+{
+	struct watchdog_device *xilinx_wwdt_wdd;
+	struct device *dev = &pdev->dev;
+	struct xwwdt_device *xdev;
+	struct clk *clk;
+	int ret;
+
+	xdev = devm_kzalloc(dev, sizeof(*xdev), GFP_KERNEL);
+	if (!xdev)
+		return -ENOMEM;
+
+	xilinx_wwdt_wdd = &xdev->xilinx_wwdt_wdd;
+	xilinx_wwdt_wdd->info = &xilinx_wwdt_ident;
+	xilinx_wwdt_wdd->ops = &xilinx_wwdt_ops;
+	xilinx_wwdt_wdd->parent = dev;
+
+	xdev->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(xdev->base))
+		return PTR_ERR(xdev->base);
+
+	clk = devm_clk_get_enabled(dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	xdev->freq = clk_get_rate(clk);
+	if (!xdev->freq)
+		return -EINVAL;
+
+	xilinx_wwdt_wdd->min_timeout = XWWDT_MIN_TIMEOUT;
+	xilinx_wwdt_wdd->timeout = XWWDT_DEFAULT_TIMEOUT;
+	xilinx_wwdt_wdd->max_hw_heartbeat_ms = 1000 * xilinx_wwdt_wdd->timeout;
+
+	if (closed_window_percent == 0 || closed_window_percent >= 100)
+		xdev->close_percent = XWWDT_CLOSE_WINDOW_PERCENT;
+	else
+		xdev->close_percent = closed_window_percent;
+
+	watchdog_init_timeout(xilinx_wwdt_wdd, wwdt_timeout, &pdev->dev);
+	spin_lock_init(&xdev->spinlock);
+	watchdog_set_drvdata(xilinx_wwdt_wdd, xdev);
+	watchdog_set_nowayout(xilinx_wwdt_wdd, 1);
+
+	ret = devm_watchdog_register_device(dev, xilinx_wwdt_wdd);
+	if (ret)
+		return ret;
+
+	dev_info(dev, "Xilinx window watchdog Timer with timeout %ds\n",
+		 xilinx_wwdt_wdd->timeout);
+
+	return 0;
+}
+
+static const struct of_device_id xwwdt_of_match[] = {
+	{ .compatible = "xlnx,versal-wwdt", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, xwwdt_of_match);
+
+static struct platform_driver xwwdt_driver = {
+	.probe = xwwdt_probe,
+	.driver = {
+		.name = "Xilinx window watchdog",
+		.of_match_table = xwwdt_of_match,
+	},
+};
+
+module_platform_driver(xwwdt_driver);
+
+MODULE_AUTHOR("Neeli Srinivas <srinivas.neeli@amd.com>");
+MODULE_DESCRIPTION("Xilinx window watchdog driver");
+MODULE_LICENSE("GPL");

drivers/watchdog/ziirave_wdt.c

@@ -731,7 +731,7 @@ static struct i2c_driver ziirave_wdt_driver = {
 		.name = "ziirave_wdt",
 		.of_match_table = zrv_wdt_of_match,
 	},
-	.probe_new = ziirave_wdt_probe,
+	.probe = ziirave_wdt_probe,
 	.remove = ziirave_wdt_remove,
 	.id_table = ziirave_wdt_id,
 };