Having an input-only pin is rare, save a string on other ports

ports/espressif/mpconfigport.h

@@ -99,4 +99,6 @@
 #define CIRCUITPY_PORT_NUM_SUPERVISOR_ALLOCATIONS (1)
 #endif
 
+#define CIRCUITPY_DIGITALIO_HAVE_INPUT_ONLY (1)
+
 #endif  // MICROPY_INCLUDED_ESPRESSIF_MPCONFIGPORT_H

py/circuitpy_mpconfig.h

@@ -582,6 +582,10 @@ void supervisor_run_background_tasks_if_tick(void);
 #define MICROPY_WRAP_MP_EXECUTE_BYTECODE PLACE_IN_ITCM
 #endif
 
+#ifndef CIRCUITPY_DIGITALIO_HAVE_INPUT_ONLY
+#define CIRCUITPY_DIGITALIO_HAVE_INPUT_ONLY (0)
+#endif
+
 #ifndef CIRCUITPY_DIGITALIO_HAVE_INVALID_PULL
 #define CIRCUITPY_DIGITALIO_HAVE_INVALID_PULL (0)
 #endif

shared-bindings/adafruit_bus_device/spi_device/SPIDevice.c

@@ -105,9 +105,13 @@ STATIC mp_obj_t adafruit_bus_device_spidevice_make_new(const mp_obj_type_t *type
     if (args[ARG_chip_select].u_obj != MP_OBJ_NULL) {
         digitalinout_result_t result = common_hal_digitalio_digitalinout_switch_to_output(MP_OBJ_TO_PTR(args[ARG_chip_select].u_obj),
             true, DRIVE_MODE_PUSH_PULL);
+        #if CIRCUITPY_DIGITALIO_HAVE_INPUT_ONLY
         if (result == DIGITALINOUT_INPUT_ONLY) {
             mp_raise_NotImplementedError(translate("Pin is input only"));
         }
+        #else
+        (void)result;
+        #endif
     }
 
     return (mp_obj_t)self;

shared-bindings/digitalio/DigitalInOut.c

@@ -53,8 +53,10 @@ STATIC void check_result(digitalinout_result_t result) {
             return;
         case DIGITALINOUT_PIN_BUSY:
             mp_raise_ValueError_varg(translate("%q in use"), MP_QSTR_Pin);
+        #if CIRCUITPY_DIGITALIO_HAVE_INPUT_ONLY
         case DIGITALINOUT_INPUT_ONLY:
             mp_raise_ValueError_varg(translate("Invalid %q"), MP_QSTR_direction);
+        #endif
         #if CIRCUITPY_DIGITALIO_HAVE_INVALID_PULL
         case DIGITALINOUT_INVALID_PULL:
             mp_raise_ValueError_varg(translate("Invalid %q"), MP_QSTR_pull);

shared-bindings/digitalio/DigitalInOut.h

@@ -38,7 +38,9 @@ extern const mp_obj_type_t digitalio_digitalinout_type;
 typedef enum {
     DIGITALINOUT_OK,
     DIGITALINOUT_PIN_BUSY,
+    #if CIRCUITPY_DIGITALIO_HAVE_INPUT_ONLY
     DIGITALINOUT_INPUT_ONLY,
+    #endif
     #if CIRCUITPY_DIGITALIO_HAVE_INVALID_PULL
     DIGITALINOUT_INVALID_PULL,
     #endif