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watchdog: aspeed: Add support for aspeed,reset-mask DT property 

This property allows the device-tree to specify how the Aspeed
watchdog timer's reset mask register(s) should be set, so that
peripherals can be individually exempted from (or opted in to) being
reset when the watchdog timer expires.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230922104231.1434-6-zev@bewilderbeest.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Zev Weiss 2023-09-22 03:42:34 -07:00 committed by Wim Van Sebroeck
parent 9931be2cfc
commit 6a6c7b006e
1 changed files with 11 additions and 0 deletions
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11
drivers/watchdog/aspeed_wdt.c
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@ -79,6 +79,8 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
#define WDT_TIMEOUT_STATUS_BOOT_SECONDARY BIT(1)
#define WDT_CLEAR_TIMEOUT_STATUS 0x14
#define WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION BIT(0)
#define WDT_RESET_MASK1 0x1c
#define WDT_RESET_MASK2 0x20
/*
* WDT_RESET_WIDTH controls the characteristics of the external pulse (if
@ -402,6 +404,8 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
if ((of_device_is_compatible(np, "aspeed,ast2500-wdt")) ||
(of_device_is_compatible(np, "aspeed,ast2600-wdt"))) {
u32 reset_mask[2];
size_t nrstmask = of_device_is_compatible(np, "aspeed,ast2600-wdt") ? 2 : 1;
u32 reg = readl(wdt->base + WDT_RESET_WIDTH);
reg &= wdt->cfg->ext_pulse_width_mask;
@ -419,6 +423,13 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
reg |= WDT_OPEN_DRAIN_MAGIC;
writel(reg, wdt->base + WDT_RESET_WIDTH);
ret = of_property_read_u32_array(np, "aspeed,reset-mask", reset_mask, nrstmask);
if (!ret) {
writel(reset_mask[0], wdt->base + WDT_RESET_MASK1);
if (nrstmask > 1)
writel(reset_mask[1], wdt->base + WDT_RESET_MASK2);
}
}
if (!of_property_read_u32(np, "aspeed,ext-pulse-duration", &duration)) {