[PATCH] lib: utils/reset: Add voltage level for gpio_reset

[Xiang W]

The reset voltage may be different under different platforms, so fdt
should describe the reset level.

Signed-off-by: Xiang W <wxjstz at 126.com>
---
 lib/utils/reset/fdt_reset_gpio.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/lib/utils/reset/fdt_reset_gpio.c b/lib/utils/reset/fdt_reset_gpio.c
index 4da1450..b834522 100644
--- a/lib/utils/reset/fdt_reset_gpio.c
+++ b/lib/utils/reset/fdt_reset_gpio.c
@@ -21,16 +21,19 @@
 
 struct gpio_reset {
 	struct gpio_pin pin;
+	u32 active_level;
 	u32 active_delay;
 	u32 inactive_delay;
 };
 
 static struct gpio_reset poweroff = {
+	.active_level = 1,
 	.active_delay = 100,
 	.inactive_delay = 100
 };
 
 static struct gpio_reset restart = {
+	.active_level = 1,
 	.active_delay = 100,
 	.inactive_delay = 100
 };
@@ -68,15 +71,15 @@ static void gpio_system_reset(u32 type, u32 reason)
 
 	if (reset) {
 		/* drive it active, also inactive->active edge */
-		gpio_direction_output(&reset->pin, 1);
+		gpio_direction_output(&reset->pin, reset->active_level);
 		sbi_timer_mdelay(reset->active_delay);
 
 		/* drive inactive, also active->inactive edge */
-		gpio_set(&reset->pin, 0);
+		gpio_set(&reset->pin, !reset->active_level);
 		sbi_timer_mdelay(reset->inactive_delay);
 
 		/* drive it active, also inactive->active edge */
-		gpio_set(&reset->pin, 1);
+		gpio_set(&reset->pin, reset->active_level);
 	}
 	/* hang !!! */
 	sbi_hart_hang();
@@ -107,6 +110,10 @@ static int gpio_reset_init(void *fdt, int nodeoff,
 			return rc;
 	}
 
+	val = fdt_getprop(fdt, nodeoff, "active-level", &len);
+	if (len > 0)
+		reset->active_level = !!fdt32_to_cpu(*val);
+
 	val = fdt_getprop(fdt, nodeoff, "active-delay-ms", &len);
 	if (len > 0)
 		reset->active_delay = fdt32_to_cpu(*val);
-- 
2.30.2