<p><b>@skullbox305</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/10983#discussion_r259594409">drivers/include/ph_oem.h</a>:</p>
<pre style='color:#555'>> +/**
+ * @brief   pH OEM device descriptor
+ */
+typedef struct ph_oem {
+    ph_oem_params_t params;         /**< device driver configuration */
+    ph_oem_interrupt_pin_cb_t cb;   /**< interrupt pin callback */
+    void *arg;                      /**< interrupt pin callback param */
+} ph_oem_t;
+
+/**
+ * @brief   Initialize a pH OEM sensor
+ *
+ * @param[in,out]   dev      device descriptor
+ * @param[in]       params   device configuration
+ *
+ * @return zero on successful initialization, non zero on error
</pre>
<p>added the defined return codes to the documentation</p>

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