watchdog: imx: Add DT ext-reset handling
The Linux imx2_wdt driver uses a fsl,ext-reset-output boolean in the device tree to specify whether the board design should use the external reset instead of the internal reset. Use this boolean to determine which mode to use rather than using external reset unconditionally. For the legacy non-DM mode, the external reset is always used in order to maintain the previous behavior. Signed-off-by: Robert Hancock <hancock@sedsystems.ca>
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@ -47,9 +47,10 @@ static void imx_watchdog_reset(struct watchdog_regs *wdog)
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#endif /* CONFIG_WATCHDOG_RESET_DISABLE*/
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}
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static void imx_watchdog_init(struct watchdog_regs *wdog)
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static void imx_watchdog_init(struct watchdog_regs *wdog, bool ext_reset)
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{
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u16 timeout;
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u16 wcr;
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/*
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* The timer watchdog can be set between
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@ -61,11 +62,14 @@ static void imx_watchdog_init(struct watchdog_regs *wdog)
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#endif
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timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1;
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#ifdef CONFIG_FSL_LSCH2
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writew((WCR_WDA | WCR_SRS | WCR_WDE) << 8 | timeout, &wdog->wcr);
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wcr = (WCR_WDA | WCR_SRS | WCR_WDE) << 8 | timeout;
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#else
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writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS |
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WCR_WDA | SET_WCR_WT(timeout), &wdog->wcr);
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wcr = WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_SRS |
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WCR_WDA | SET_WCR_WT(timeout);
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if (ext_reset)
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wcr |= WCR_WDT;
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#endif /* CONFIG_FSL_LSCH2*/
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writew(wcr, &wdog->wcr);
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imx_watchdog_reset(wdog);
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}
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@ -81,11 +85,12 @@ void hw_watchdog_init(void)
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{
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struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
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imx_watchdog_init(wdog);
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imx_watchdog_init(wdog, true);
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}
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#else
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struct imx_wdt_priv {
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void __iomem *base;
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bool ext_reset;
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};
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static int imx_wdt_reset(struct udevice *dev)
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@ -111,7 +116,7 @@ static int imx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
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{
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struct imx_wdt_priv *priv = dev_get_priv(dev);
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imx_watchdog_init(priv->base);
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imx_watchdog_init(priv->base, priv->ext_reset);
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return 0;
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}
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@ -124,6 +129,8 @@ static int imx_wdt_probe(struct udevice *dev)
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if (!priv->base)
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return -ENOENT;
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priv->ext_reset = dev_read_bool(dev, "fsl,ext-reset-output");
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return 0;
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}
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