fixed 10389 missing detection

src/drivers/elphel/elphel393-pwr.c

@@ -289,6 +289,7 @@ static int set_enable(struct device *dev, int chn, int enable);
 static int get_pgood(struct device *dev, int chn);
 
 static struct device * find_device_by_i2c_addr(int address);
+static int i2c_addr_gpiochip_match(struct gpio_chip *chip, void *data);
 int gpio_10389_ctrl(struct device *dev, int value);
 
 /*
@@ -656,9 +657,10 @@ int gpio_10389_ctrl(struct device *dev, int value){
 	int i, res;
 	int val = 0;
 
-	struct device *tmp_dev;
-	tmp_dev=find_device_by_i2c_addr(GPIO_10389_U4_ADDR);
-	if (!tmp_dev) {
+	struct gpio_chip *chip;
+	int tmp_addr = GPIO_10389_U4_ADDR;
+	chip = gpiochip_find(&tmp_addr, i2c_addr_gpiochip_match);
+	if (chip==NULL) {
 		pr_err("10389 is not connected\n");
 		return -ENODEV;
 	}