diff --git a/configs/msm8998/audio_platform_info.xml b/configs/msm8998/audio_platform_info.xml
index e9840375..b8ab8dc4 100755
--- a/configs/msm8998/audio_platform_info.xml
+++ b/configs/msm8998/audio_platform_info.xml
@@ -110,5 +110,165 @@
         <device name="SND_DEVICE_OUT_SPEAKER_AND_BT_SCO" backend="speaker-and-bt-sco" interface="SLIMBUS_0_RX-and-SLIMBUS_7_RX"/>
         <device name="SND_DEVICE_OUT_SPEAKER_AND_BT_SCO_WB" backend="speaker-and-bt-sco-wb" interface="SLIMBUS_0_RX-and-SLIMBUS_7_RX"/>
     </backend_names>
+    <!-- below values are for ref purpose to OEM, doesn't contain actual hardware info on MTP -->
+    <microphone_characteristics>
+        <microphone valid_mask="31" device_id="builtin_mic_1" type="AUDIO_DEVICE_IN_BUILTIN_MIC" address="bottom" location="AUDIO_MICROPHONE_LOCATION_MAINBODY"
+            group="0" index_in_the_group="0" directionality="AUDIO_MICROPHONE_DIRECTIONALITY_OMNI" num_frequency_responses="93"
+            frequencies="100.00 106.00 112.00 118.00 125.00 132.00 140.00 150.00 160.00 170.00 180.00 190.00 200.00 212.00 224.00 236.00 250.00 265.00 280.00 300.00 315.00 335.00 355.00 375.00 400.00 425.00 450.00 475.00 500.00 530.00 560.00 600.00 630.00 670.00 710.00 750.00 800.00 850.00 900.00 950.00 1000.00 1060.00 1120.00 1180.00 1250.00 1320.00 1400.00 1500.00 1600.00 1700.00 1800.00 1900.00 2000.00 2120.00 2240.00 2360.00 2500.00 2650.00 2800.00 3000.00 3150.00 3350.00 3550.00 3750.00 4000.00 4250.00 4500.00 4750.00 5000.00 5300.00 5600.00 6000.00 6300.00 6700.00 7100.00 7500.00 8000.00 8500.00 9000.00 9500.00 10000.00 10600.00 11200.00 11800.00 12500.00 13200.00 14000.00 15000.00 16000.00 17000.00 18000.00 19000.00 20000.00"
+            responses="-0.78 -0.71 -0.64 -0.60 -0.55 -0.50 -0.47 -0.42 -0.39 -0.36 -0.34 -0.33 -0.32 -0.29 -0.28 -0.28 -0.27 -0.25 -0.25 -0.24 -0.23 -0.23 -0.22 -0.22 -0.19 -0.17 -0.15 -0.15 -0.14 -0.14 -0.12 -0.11 -0.10 -0.10 -0.08 -0.07 -0.07 -0.04 -0.03 -0.01 0.00 0.04 0.06 0.07 0.08 0.13 0.09 0.14 0.19 0.23 0.28 0.29 0.31 0.37 0.88 0.86 0.77 0.78 0.84 0.86 1.05 1.12 1.18 1.25 1.43 1.66 1.83 2.02 2.23 2.59 2.84 3.35 4.01 6.82 6.62 6.42 7.30 8.23 7.54 12.68 13.76 18.69 19.68 20.90 23.70 25.10 21.65 16.18 18.84 25.44 23.48 23.22 24.89"
+            sensitivity="-37.0" max_spl="132.5" min_spl="28.5" orientation="0.0 0.0 1.0" geometric_location="0.0269 0.0058 0.0079" />
+        <microphone valid_mask="31" device_id="builtin_mic_2" type="AUDIO_DEVICE_IN_BACK_MIC" address="back" location="AUDIO_MICROPHONE_LOCATION_MAINBODY"
+            group="0" index_in_the_group="1" directionality="AUDIO_MICROPHONE_DIRECTIONALITY_OMNI" num_frequency_responses="92"
+            frequencies="106.00 112.00 118.00 125.00 132.00 140.00 150.00 160.00 170.00 180.00 190.00 200.00 212.00 224.00 236.00 250.00 265.00 280.00 300.00 315.00 335.00 355.00 375.00 400.00 425.00 450.00 475.00 500.00 530.00 560.00 600.00 630.00 670.00 710.00 750.00 800.00 850.00 900.00 950.00 1000.00 1060.00 1120.00 1180.00 1250.00 1320.00 1400.00 1500.00 1600.00 1700.00 1800.00 1900.00 2000.00 2120.00 2240.00 2360.00 2500.00 2650.00 2800.00 3000.00 3150.00 3350.00 3550.00 3750.00 4000.00 4250.00 4500.00 4750.00 5000.00 5300.00 5600.00 6000.00 6300.00 6700.00 7100.00 7500.00 8000.00 8500.00 9000.00 9500.00 10000.00 10600.00 11200.00 11800.00 12500.00 13200.00 14000.00 15000.00 16000.00 17000.00 18000.00 19000.00 20000.00"
+            responses="-0.75 -0.74 -0.69 -0.65 -0.62 -0.61 -0.56 -0.53 -0.50 -0.47 -0.43 -0.40 -0.37 -0.36 -0.33 -0.30 -0.28 -0.25 -0.24 -0.24 -0.24 -0.25 -0.24 -0.12 -0.10 -0.08 -0.09 -0.07 -0.07 -0.06 -0.06 -0.06 -0.05 -0.04 -0.05 -0.04 -0.01 0.02 0.02 0.00 0.02 0.03 0.07 0.10 0.10 0.13 0.01 0.01 0.10 0.11 0.19 0.24 0.38 0.46 0.26 0.27 0.43 0.76 0.75 1.09 1.09 0.94 1.06 1.21 1.47 1.45 1.36 2.07 2.85 2.90 3.85 4.65 5.84 5.46 6.15 7.50 8.30 10.62 12.70 16.65 20.95 25.41 26.32 20.20 16.60 11.24 7.85 7.62 20.19 7.32 2.87 5.18"
+            sensitivity="-37.0" max_spl="132.5" min_spl="28.5" orientation="0.0 1.0 0.0" geometric_location="0.0546 0.1456 0.00415" />
+        <microphone valid_mask="31" device_id="builtin_mic_3" type="AUDIO_DEVICE_IN_BUILTIN_MIC" address="top" location="AUDIO_MICROPHONE_LOCATION_MAINBODY"
+            group="0" index_in_the_group="2" directionality="AUDIO_MICROPHONE_DIRECTIONALITY_OMNI" num_frequency_responses="92"
+            frequencies="100.00 106.00 112.00 118.00 125.00 132.00 140.00 150.00 160.00 170.00 180.00 190.00 200.00 212.00 224.00 236.00 250.00 265.00 280.00 300.00 315.00 335.00 355.00 375.00 400.00 425.00 450.00 475.00 500.00 530.00 560.00 600.00 630.00 670.00 710.00 750.00 800.00 850.00 900.00 950.00 1000.00 1060.00 1120.00 1180.00 1250.00 1320.00 1400.00 1500.00 1600.00 1700.00 1800.00 1900.00 2000.00 2120.00 2240.00 2360.00 2500.00 2650.00 2800.00 3000.00 3150.00 3350.00 3550.00 3750.00 4000.00 4250.00 4500.00 4750.00 5000.00 5300.00 5600.00 6000.00 6300.00 6700.00 7100.00 7500.00 8000.00 8500.00 9000.00 9500.00 10000.00 10600.00 11200.00 11800.00 12500.00 13200.00 14000.00 15000.00 16000.00 17000.00 18000.00 19000.00"
+            responses="-9.24 -9.31 -9.39 -9.45 -9.46 -9.47 -9.50 -9.52 -9.51 -9.52 -9.51 -9.50 -9.49 -9.47 -9.48 -9.49 -9.48 -9.50 -9.51 -9.53 -9.55 -9.59 -9.63 -9.67 -9.58 -9.57 -9.65 -9.68 -9.71 -9.75 -9.79 -9.84 -9.87 -9.87 -9.90 -9.90 -9.91 -9.97 -10.01 -10.05 -9.85 -9.93 -9.94 -9.98 -10.04 -10.12 -10.28 -10.25 -10.01 -9.86 -9.81 -9.82 -9.61 -9.46 -8.27 -8.42 -8.98 -8.99 -8.82 -9.21 -8.92 -8.97 -9.30 -9.44 -9.52 -9.28 -9.09 -8.81 -7.02 -5.72 -5.30 -7.26 -8.39 -12.28 -8.23 -6.99 -5.52 -4.87 -3.82 -6.09 0.00 -2.15 -0.26 1.48 5.22 10.92 6.41 9.55 12.96 3.35 22.00 19.75"
+            sensitivity="-37.0" max_spl="132.5" min_spl="28.5" orientation="0.0 0.0 1.0" geometric_location="0.0274 0.14065 0.0079" />
+    </microphone_characteristics>
+    <snd_devices>
+        <input_snd_device>
+            <input_snd_device_mic_mapping>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_CAMCORDER_MIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_3"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_VOICE_REC_MIC_AEC_NS">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_VOICE_REC_MIC_AEC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_VOICE_REC_MIC_NS">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_VOICE_REC_MIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_HANDSET_MIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_VOICE_DMIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_VOICE_DMIC_TMUS">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_VOICE_SPEAKER_DMIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_3"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_HANDSET_DMIC_AEC_NS">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_HANDSET_DMIC_AEC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_HANDSET_DMIC_NS">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_HANDSET_DMIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_SPEAKER_DMIC_AEC_NS">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_3"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_SPEAKER_DMIC_AEC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_3"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_SPEAKER_DMIC_NS">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_3"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_SPEAKER_MIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_3"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_UNPROCESSED_MIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_DIRECT"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_UNPROCESSED_STEREO_MIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_DIRECT AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED AUDIO_MICROPHONE_CHANNEL_MAPPING_DIRECT"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_UNPROCESSED_THREE_MIC">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_DIRECT AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED AUDIO_MICROPHONE_CHANNEL_MAPPING_DIRECT AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED"/>
+                        <mic_info mic_device_id="builtin_mic_3"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED AUDIO_MICROPHONE_CHANNEL_MAPPING_DIRECT"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_HANDSET_DMIC_STEREO">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+                    <snd_dev in_snd_device="SND_DEVICE_IN_SPEAKER_DMIC_STEREO">
+                        <mic_info mic_device_id="builtin_mic_1"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_2"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                        <mic_info mic_device_id="builtin_mic_3"
+                            channel_mapping="AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED"/>
+                    </snd_dev>
+            </input_snd_device_mic_mapping>
+        </input_snd_device>
+    </snd_devices>
 </audio_platform_info>