<p><b>@benpicco</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/12091#discussion_r322313360">drivers/eeprom/include/eeprom_driver.h</a>:</p>
<pre style='color:#555'>> +    int (*write)(void *handle, eeprom_off_t pos, const void *data, size_t len);
+    /**
+     * @brief   Erase the whole EEPROM
+     *
+     * @param[in,out]   handle  Device handle of the EEPROM to erase
+     *
+     * @retval  0       Success
+     * @retval  -EIO    I/O error occurred during erase
+     *
+     * If `0` is returned a subsequent read for any valid address must return
+     * @ref eeprom_driver_t::clear_byte. If `-EIO` is returned, the whole
+     * content of the EEPROM is undefined.
+     *
+     * This function is optional to implement by the driver. If the function
+     * pointer is `NULL`, a fallback implementation that calls
+     * @ref eeprom_driver_t::set is used instead.
</pre>
<blockquote>
<p><code>warning: unable to resolve reference to `eeprom_driver_t::set' for \ref command</code></p>
</blockquote>

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