dm: core: Fix devfdt_get_addr_ptr return value
According to the description of devfdt_get_addr_ptr, this function should
return NULL on failure, but currently it returns (void *)FDT_ADDR_T_NONE.
Fix this by making devfdt_get_addr_ptr return NULL on failure, as
described in the function comments. Also, update the drivers currently
checking (void *)FDT_ADDR_T_NONE to check for NULL.
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/watchdog/ast_wdt.c b/drivers/watchdog/ast_wdt.c
index 7e11465..a21f9a4 100644
--- a/drivers/watchdog/ast_wdt.c
+++ b/drivers/watchdog/ast_wdt.c
@@ -91,8 +91,8 @@
struct ast_wdt_priv *priv = dev_get_priv(dev);
priv->regs = devfdt_get_addr_ptr(dev);
- if (IS_ERR(priv->regs))
- return PTR_ERR(priv->regs);
+ if (!priv->regs)
+ return -EINVAL;
return 0;
}