[PATCH v3 2/2] drivers/watchdog: ASPEED reference dev tree properties for config
From: Christopher Bostic <hidden>
Date: 2017-06-29 00:28:52
Also in:
linux-watchdog, lkml, openbmc
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
Reference the system device tree when configuring the watchdog
engines. If optional property 'aspeed,no-sys-reset' is specified
then override the default config and do not set sys reset mode.
If optional property 'aspeed,no-soc-reset' is specified then
override the default and do not set soc reset mode.
Signed-off-by: Christopher Bostic <redacted>
---
v3 - Invert the logic for system reset dev tree property to
preserve backwards compatibility. If not specified the
default is to configure for system reset
- Add check for 'aspeed,no-soc-reset' property and only if
not present is SOC reset to be configured. This preserves
backwards compatibility.
v2 - Change of_get_property() to of_property_read_bool()
- Remove redundant check for NULL struct device_node pointer
- Optional property names now start with prefix 'aspeed,'
---
drivers/watchdog/aspeed_wdt.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index 1c65258..ace74f8 100644
--- a/drivers/watchdog/aspeed_wdt.c
+++ b/drivers/watchdog/aspeed_wdt.c@@ -140,6 +140,7 @@ static int aspeed_wdt_probe(struct platform_device *pdev) { struct aspeed_wdt *wdt; struct resource *res; + struct device_node *np; int ret; wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
@@ -166,12 +167,21 @@ static int aspeed_wdt_probe(struct platform_device *pdev) /* * Control reset on a per-device basis to ensure the - * host is not affected by a BMC reboot, so only reset - * the SOC and not the full chip + * host is not affected by a BMC reboot */ - wdt->ctrl = WDT_CTRL_RESET_MODE_SOC | - WDT_CTRL_1MHZ_CLK | - WDT_CTRL_RESET_SYSTEM; + wdt->ctrl = WDT_CTRL_1MHZ_CLK; + + np = pdev->dev.of_node; + if (!(of_property_read_bool(np, "aspeed,no-soc-reset"))) + wdt->ctrl |= WDT_CTRL_RESET_MODE_SOC; + + if (!(of_property_read_bool(np, "aspeed,no-sys-reset"))) + wdt->ctrl |= WDT_CTRL_RESET_SYSTEM; + + if (of_property_read_bool(np, "aspeed,external-signal")) + wdt->ctrl |= WDT_CTRL_WDT_EXT; + + writel(wdt->ctrl, wdt->base + WDT_CTRL); if (readl(wdt->base + WDT_CTRL) & WDT_CTRL_ENABLE) { aspeed_wdt_start(&wdt->wdd);
--
1.8.2.2