drivers: modem: quectel-bg9x: fix for bg95 pinout

The BG95 pin configuration does not internally ever use the reset pin.
Because of this, there is no need to make reset pin mandatory.
Commit removes reset pin dependency [e.g. in case of BG95].

Signed-off-by: Andrei Hutanu <[email protected]>

Author: Andrei Hutanu

drivers/modem/quectel-bg9x.c

@@ -22,7 +22,9 @@ static K_KERNEL_STACK_DEFINE(modem_workq_stack, CONFIG_MODEM_QUECTEL_BG9X_RX_WOR
 NET_BUF_POOL_DEFINE(mdm_recv_pool, MDM_RECV_MAX_BUF, MDM_RECV_BUF_SIZE, 0, NULL);
 
 static const struct gpio_dt_spec power_gpio = GPIO_DT_SPEC_INST_GET(0, mdm_power_gpios);
+#if DT_INST_NODE_HAS_PROP(0, mdm_reset_gpios)
 static const struct gpio_dt_spec reset_gpio = GPIO_DT_SPEC_INST_GET(0, mdm_reset_gpios);
+#endif
 #if DT_INST_NODE_HAS_PROP(0, mdm_dtr_gpios)
 static const struct gpio_dt_spec dtr_gpio = GPIO_DT_SPEC_INST_GET(0, mdm_dtr_gpios);
 #endif
@@ -1203,11 +1205,13 @@ static int modem_init(const struct device *dev)
 		goto error;
 	}
 
+#if DT_INST_NODE_HAS_PROP(0, mdm_reset_gpios)
 	ret = gpio_pin_configure_dt(&reset_gpio, GPIO_OUTPUT_LOW);
 	if (ret < 0) {
 		LOG_ERR("Failed to configure %s pin", "reset");
 		goto error;
 	}
+#endif
 
 #if DT_INST_NODE_HAS_PROP(0, mdm_dtr_gpios)
 	ret = gpio_pin_configure_dt(&dtr_gpio, GPIO_OUTPUT_LOW);

dts/bindings/modem/quectel,bg9x.yaml

@@ -14,7 +14,6 @@ properties:
 
   mdm-reset-gpios:
     type: phandle-array
-    required: true
 
   mdm-dtr-gpios:
     type: phandle-array