GPIO descriptor fixes (#578)

Drivers/hx8357-module/bindings/himax,hx8357.yaml

@@ -54,10 +54,6 @@ properties:
     type: phandles
     default: GPIO_PIN_SPEC_NONE
     description: Reset GPIO pin
-  reset-active-high:
-    type: boolean
-    default: false
-    description: Whether the reset pin is active high
   backlight:
     type: phandle
     default: "NULL"

Drivers/hx8357-module/include/drivers/hx8357.h

@@ -23,7 +23,6 @@ struct Hx8357Config {
     uint32_t pixel_clock_hz;
     struct GpioPinSpec pin_dc;
     struct GpioPinSpec pin_reset;
-    bool reset_active_high;
     // Optional reference to this display's backlight device, NULL if none.
     struct Device* backlight;
 };

Drivers/hx8357-module/source/hx8357.cpp

@@ -264,9 +264,10 @@ static error_t start(Device* device) {
             free(internal);
             return ERROR_RESOURCE;
         }
-        gpio_set_level(static_cast<gpio_num_t>(reset_pin), config->reset_active_high ? 1 : 0);
+        // HX8357's reset line is fixed active-low in hardware.
+        gpio_set_level(static_cast<gpio_num_t>(reset_pin), 0);
         vTaskDelay(pdMS_TO_TICKS(10));
-        gpio_set_level(static_cast<gpio_num_t>(reset_pin), config->reset_active_high ? 0 : 1);
+        gpio_set_level(static_cast<gpio_num_t>(reset_pin), 1);
         vTaskDelay(pdMS_TO_TICKS(120));
     }