Merge tag 'linux-watchdog-5.18-rc1' of git://www.linux-watchdog.org/linux-watchdog

Pull watchdog updates from Wim Van Sebroeck:

 - add support for BCM4908

 - renesas_wdt: add R-Car Gen4 support

 - improve watchdog_dev function documentation

 - sp5100_tco: replace the cd6h/cd7h port I/O with MMIO accesses during
   initialization

 - several other small improvements and fixes

* tag 'linux-watchdog-5.18-rc1' of git://www.linux-watchdog.org/linux-watchdog:
  Watchdog: sp5100_tco: Enable Family 17h+ CPUs
  Watchdog: sp5100_tco: Add initialization using EFCH MMIO
  Watchdog: sp5100_tco: Refactor MMIO base address initialization
  Watchdog: sp5100_tco: Move timer initialization into function
  watchdog: ixp4xx: Implement restart
  watchdog: orion_wdt: support pretimeout on Armada-XP
  watchdog: allow building BCM7038_WDT for BCM4908
  watchdog: renesas_wdt: Add R-Car Gen4 support
  dt-bindings: watchdog: renesas-wdt: Document r8a779f0 support
  watchdog: Improve watchdog_dev function documentation
  watchdog: aspeed: add nowayout support
  watchdog: rti-wdt: Add missing pm_runtime_disable() in probe function
  watchdog: imx2_wdg: Alow ping on suspend

Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml

@@ -55,6 +55,11 @@ properties:
               - renesas,r8a779a0-wdt     # R-Car V3U
           - const: renesas,rcar-gen3-wdt # R-Car Gen3 and RZ/G2
 
+      - items:
+          - enum:
+              - renesas,r8a779f0-wdt     # R-Car S4-8
+          - const: renesas,rcar-gen4-wdt # R-Car Gen4
+
   reg:
     maxItems: 1
 

drivers/watchdog/Kconfig

@@ -1779,7 +1779,7 @@ config BCM7038_WDT
 	tristate "BCM63xx/BCM7038 Watchdog"
 	select WATCHDOG_CORE
 	depends on HAS_IOMEM
-	depends on ARCH_BRCMSTB || BMIPS_GENERIC || BCM63XX || COMPILE_TEST
+	depends on ARCH_BCM4908 || ARCH_BRCMSTB || BMIPS_GENERIC || BCM63XX || COMPILE_TEST
 	help
 	  Watchdog driver for the built-in hardware in Broadcom 7038 and
 	  later SoCs used in set-top boxes.  BCM7038 was made public

drivers/watchdog/aspeed_wdt.c

@@ -13,6 +13,11 @@
 #include <linux/platform_device.h>
 #include <linux/watchdog.h>
 
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
 struct aspeed_wdt {
 	struct watchdog_device	wdd;
 	void __iomem		*base;
@@ -266,6 +271,8 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
 	wdt->wdd.timeout = WDT_DEFAULT_TIMEOUT;
 	watchdog_init_timeout(&wdt->wdd, 0, dev);
 
+	watchdog_set_nowayout(&wdt->wdd, nowayout);
+
 	np = dev->of_node;
 
 	ofdid = of_match_node(aspeed_wdt_of_table, np);

drivers/watchdog/imx2_wdt.c

@@ -66,6 +66,7 @@ struct imx2_wdt_device {
 	struct watchdog_device wdog;
 	bool ext_reset;
 	bool clk_is_on;
+	bool no_ping;
 };
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
@@ -312,12 +313,18 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
 
 	wdev->ext_reset = of_property_read_bool(dev->of_node,
 						"fsl,ext-reset-output");
+	/*
+	 * The i.MX7D doesn't support low power mode, so we need to ping the watchdog
+	 * during suspend.
+	 */
+	wdev->no_ping = !of_device_is_compatible(dev->of_node, "fsl,imx7d-wdt");
 	platform_set_drvdata(pdev, wdog);
 	watchdog_set_drvdata(wdog, wdev);
 	watchdog_set_nowayout(wdog, nowayout);
 	watchdog_set_restart_priority(wdog, 128);
 	watchdog_init_timeout(wdog, timeout, dev);
-	watchdog_stop_ping_on_suspend(wdog);
+	if (wdev->no_ping)
+		watchdog_stop_ping_on_suspend(wdog);
 
 	if (imx2_wdt_is_running(wdev)) {
 		imx2_wdt_set_timeout(wdog, wdog->timeout);
@@ -366,9 +373,11 @@ static int __maybe_unused imx2_wdt_suspend(struct device *dev)
 		imx2_wdt_ping(wdog);
 	}
 
-	clk_disable_unprepare(wdev->clk);
+	if (wdev->no_ping) {
+		clk_disable_unprepare(wdev->clk);
 
-	wdev->clk_is_on = false;
+		wdev->clk_is_on = false;
+	}
 
 	return 0;
 }
@@ -380,11 +389,14 @@ static int __maybe_unused imx2_wdt_resume(struct device *dev)
 	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
 	int ret;
 
-	ret = clk_prepare_enable(wdev->clk);
-	if (ret)
-		return ret;
+	if (wdev->no_ping) {
+		ret = clk_prepare_enable(wdev->clk);
 
-	wdev->clk_is_on = true;
+		if (ret)
+			return ret;
+
+		wdev->clk_is_on = true;
+	}
 
 	if (watchdog_active(wdog) && !imx2_wdt_is_running(wdev)) {
 		/*
@@ -407,6 +419,7 @@ static SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend,
 
 static const struct of_device_id imx2_wdt_dt_ids[] = {
 	{ .compatible = "fsl,imx21-wdt", },
+	{ .compatible = "fsl,imx7d-wdt", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, imx2_wdt_dt_ids);

drivers/watchdog/ixp4xx_wdt.c

@@ -84,10 +84,24 @@ static int ixp4xx_wdt_set_timeout(struct watchdog_device *wdd,
 	return 0;
 }
 
+static int ixp4xx_wdt_restart(struct watchdog_device *wdd,
+                              unsigned long action, void *data)
+{
+	struct ixp4xx_wdt *iwdt = to_ixp4xx_wdt(wdd);
+
+	__raw_writel(IXP4XX_WDT_KEY, iwdt->base + IXP4XX_OSWK_OFFSET);
+	__raw_writel(0, iwdt->base + IXP4XX_OSWT_OFFSET);
+	__raw_writel(IXP4XX_WDT_COUNT_ENABLE | IXP4XX_WDT_RESET_ENABLE,
+		     iwdt->base + IXP4XX_OSWE_OFFSET);
+
+	return 0;
+}
+
 static const struct watchdog_ops ixp4xx_wdt_ops = {
 	.start = ixp4xx_wdt_start,
 	.stop = ixp4xx_wdt_stop,
 	.set_timeout = ixp4xx_wdt_set_timeout,
+	.restart = ixp4xx_wdt_restart,
 	.owner = THIS_MODULE,
 };
 

drivers/watchdog/orion_wdt.c

@@ -238,8 +238,10 @@ static int armada370_start(struct watchdog_device *wdt_dev)
 	atomic_io_modify(dev->reg + TIMER_A370_STATUS, WDT_A370_EXPIRED, 0);
 
 	/* Enable watchdog timer */
-	atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit,
-						dev->data->wdt_enable_bit);
+	reg = dev->data->wdt_enable_bit;
+	if (dev->wdt.info->options & WDIOF_PRETIMEOUT)
+		reg |= TIMER1_ENABLE_BIT;
+	atomic_io_modify(dev->reg + TIMER_CTRL, reg, reg);
 
 	/* Enable reset on watchdog */
 	reg = readl(dev->rstout);
@@ -312,7 +314,7 @@ static int armada375_stop(struct watchdog_device *wdt_dev)
 static int armada370_stop(struct watchdog_device *wdt_dev)
 {
 	struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
-	u32 reg;
+	u32 reg, mask;
 
 	/* Disable reset on watchdog */
 	reg = readl(dev->rstout);
@@ -320,7 +322,10 @@ static int armada370_stop(struct watchdog_device *wdt_dev)
 	writel(reg, dev->rstout);
 
 	/* Disable watchdog timer */
-	atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
+	mask = dev->data->wdt_enable_bit;
+	if (wdt_dev->info->options & WDIOF_PRETIMEOUT)
+		mask |= TIMER1_ENABLE_BIT;
+	atomic_io_modify(dev->reg + TIMER_CTRL, mask, 0);
 
 	return 0;
 }

drivers/watchdog/renesas_wdt.c

@@ -327,6 +327,7 @@ static SIMPLE_DEV_PM_OPS(rwdt_pm_ops, rwdt_suspend, rwdt_resume);
 static const struct of_device_id rwdt_ids[] = {
 	{ .compatible = "renesas,rcar-gen2-wdt", },
 	{ .compatible = "renesas,rcar-gen3-wdt", },
+	{ .compatible = "renesas,rcar-gen4-wdt", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, rwdt_ids);

drivers/watchdog/rti_wdt.c

@@ -228,6 +228,7 @@ static int rti_wdt_probe(struct platform_device *pdev)
 	ret = pm_runtime_get_sync(dev);
 	if (ret) {
 		pm_runtime_put_noidle(dev);
+		pm_runtime_disable(&pdev->dev);
 		return dev_err_probe(dev, ret, "runtime pm failed\n");
 	}
 

drivers/watchdog/sp5100_tco.h

@@ -58,6 +58,7 @@
 #define SB800_PM_WATCHDOG_SECOND_RES	GENMASK(1, 0)
 #define SB800_ACPI_MMIO_DECODE_EN	BIT(0)
 #define SB800_ACPI_MMIO_SEL		BIT(1)
+#define SB800_ACPI_MMIO_MASK		GENMASK(1, 0)
 
 #define SB800_PM_WDT_MMIO_OFFSET	0xB00
 
@@ -82,4 +83,10 @@
 #define EFCH_PM_ISACONTROL_MMIOEN	BIT(1)
 
 #define EFCH_PM_ACPI_MMIO_ADDR		0xfed80000
+#define EFCH_PM_ACPI_MMIO_PM_OFFSET	0x00000300
 #define EFCH_PM_ACPI_MMIO_WDT_OFFSET	0x00000b00
+
+#define EFCH_PM_ACPI_MMIO_PM_ADDR	(EFCH_PM_ACPI_MMIO_ADDR +	\
+					 EFCH_PM_ACPI_MMIO_PM_OFFSET)
+#define EFCH_PM_ACPI_MMIO_PM_SIZE	8
+#define AMD_ZEN_SMBUS_PCI_REV		0x51