Enable connector fallback for ADC/PWM provisioning in Arduino-index mode

[Copilot]

ADC/PWM provisioning incorrectly skipped connector io-channel-map/pwm-map fallback when /zephyr,user/adc-pin-gpios/pwm-pin-gpios was present with digital_pin_gpios, leaving arrays empty when explicit channel lists were absent. The issue was that the code didn't allow connector fallback within Arduino-index mode.

Changes

Added #elif defined(ZARD_*_CONNECTOR) fallback branches within the digital_pin_gpios conditional blocks for:

• ADC provisioning (arduino_adc[], channel_cfg[]): Check io-channels → connector io-channel-map
• PWM provisioning (arduino_pwm[]): Check pwms → connector pwm-map

This enables connector fallback when *-pin-gpios + digital_pin_gpios exist but explicit channel lists are absent, while maintaining BUILD_ASSERT validation that provisioning and association arrays match in size.

Before

const struct adc_dt_spec arduino_adc[] = {
#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), adc_pin_gpios)
  #if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), digital_pin_gpios)
    #if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), io_channels)
      DT_FOREACH_PROP_ELEM(DT_PATH(zephyr_user), io_channels, ADC_DT_SPEC)
    #endif
    // Falls through to empty when io_channels absent
  #else //global pin rule
    //TODO
  #endif
#elif defined(ZARD_ADC_CONNECTOR)
  DT_FOREACH_MAP_ENTRY(..., io_channel_map, ADC_CONN_CHANNEL_DT)
#endif
};

After

const struct adc_dt_spec arduino_adc[] = {
#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), adc_pin_gpios)
  #if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), digital_pin_gpios)
    #if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), io_channels)
      DT_FOREACH_PROP_ELEM(DT_PATH(zephyr_user), io_channels, ADC_DT_SPEC)
    #elif defined(ZARD_ADC_CONNECTOR)
      DT_FOREACH_MAP_ENTRY(..., io_channel_map, ADC_CONN_CHANNEL_DT)
    #endif
  #else //global pin rule
    //TODO
  #endif
#elif defined(ZARD_ADC_CONNECTOR)
  DT_FOREACH_MAP_ENTRY(..., io_channel_map, ADC_CONN_CHANNEL_DT)
#endif
};

Logic Flow

When *-pin-gpios + digital_pin_gpios exist (Arduino-index mode):

• Check explicit provisioning (io-channels/pwms) first
• Fall back to connector maps if absent
• BUILD_ASSERT validates array size match

When *-pin-gpios exists without digital_pin_gpios (global GPIO mode):

• Global pin rule (TODO - not yet implemented)

When *-pin-gpios doesn't exist:

• Use connector maps for both association and provisioning

Aligns with configuration-reference.md: connector maps provision channels when explicit channel lists are absent, while respecting the different rules for Arduino-index vs global GPIO numbering modes.

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[soburi]

@copilot digital_pin_gpiosがある場合とない場合でルールが異なります。io-channels の有無は最終的にBUILD_ASSERTでチェックされます。修正を。

[Copilot]

@copilot digital_pin_gpiosがある場合とない場合でルールが異なります。io-channels の有無は最終的にBUILD_ASSERTでチェックされます。修正を。

Fixed in commit e2cf6d7. Added connector fallback within the digital_pin_gpios check:

• When *-pin-gpios + digital_pin_gpios exist: tries io-channels/pwms first, then falls back to connector maps
• When *-pin-gpios exists without digital_pin_gpios: global pin rule (TODO)
• When *-pin-gpios doesn't exist: connector maps for both

BUILD_ASSERT continues to validate that provisioning and association arrays match in size.

[soburi]

@copilot TODOを実装してください。