[PATCH v2 2/2] drivers/watchdog: ASPEED reference dev tree properties for config

Christopher Bostic
2017-06-27T21:18:05Z

Reference the system device tree when configuring the watchdog
engines. Set external signal mode on timeout if specified.
Set system reset on timeout if specified.

Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
---
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 | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index 1c65258..71ce5f5 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);
@@ -170,8 +171,16 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
* the SOC and not the full chip
*/
wdt->ctrl = WDT_CTRL_RESET_MODE_SOC |
- WDT_CTRL_1MHZ_CLK |
- WDT_CTRL_RESET_SYSTEM;
+ WDT_CTRL_1MHZ_CLK;
+
+ np = pdev->dev.of_node;
+ if (of_property_read_bool(np, "aspeed,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