linux-kernel - [PATCH 0/4] ARM: dts: qcom: msm8960: expressatt: Add more peripherals

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Message-Id: <20251119-expressatt_nfc_accel_magn_light-v1-0-636f16f05cf4@gmail.com>
Date: Wed, 19 Nov 2025 23:14:41 -0800
From: Rudraksha Gupta via B4 Relay <devnull+guptarud.gmail.com@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Rudraksha Gupta <guptarud@...il.com>
Subject: [PATCH 0/4] ARM: dts: qcom: msm8960: expressatt: Add more
 peripherals

Intro:
=================
The following is now working on the Samsung Galaxy Express SGH-I437, an
old 2012 Android phone:
- Light Sensor
    - Proximity is currently giving bogus values
- NFC
- Magnetometer
    - Maybe need to update the mount matrix?
- Accelerometer
    - Maybe need to update the mount matrix?

Tests:
=================
Light Sensor
=================
/sys/bus/iio/devices/iio:device2 # cat in_intensity0_raw && cat in_intensity1_raw
0
0
/sys/bus/iio/devices/iio:device2 # cat in_intensity0_raw && cat in_intensity1_raw
163
28

=================
NFC
=================
nfc0:
          Tags: [ ]
          Devices: [ ]
          Protocols: [ Felica MIFARE Jewel ISO-DEP NFC-DEP ]
          Powered: Yes
          RF Mode: None
          lto: 150
          rw: 15
          miux: 2047

Start polling on nfc0 as initiator

Targets found for nfc0
  Tags: [ tag4 ]
  Devices: [ ]

=================
Magnetometer
=================
/sys/bus/iio/devices/iio:device1 # cat in_magn_x_raw && cat in_magn_y_raw && cat in_magn_z_raw
-441672
1223706
3275580
/sys/bus/iio/devices/iio:device1 # cat in_magn_x_raw && cat in_magn_y_raw && cat in_magn_z_raw
-364650
1206172
3248674
/sys/bus/iio/devices/iio:device1 # cat in_magn_x_raw && cat in_magn_y_raw && cat in_magn_z_raw
-439362
1214092
3180892

=================
Accelerometer
=================
/sys/bus/iio/devices/iio:device0 # cat in_accel_x_raw && cat in_accel_y_raw && cat in_accel_z_raw
16
484
-48
/sys/bus/iio/devices/iio:device0 # cat in_accel_x_raw && cat in_accel_y_raw && cat in_accel_z_raw
13
489
469
/sys/bus/iio/devices/iio:device0 # cat in_accel_x_raw && cat in_accel_y_raw && cat in_accel_z_raw
433
106
48

More Information:
=================
- Device page:
https://wiki.postmarketos.org/wiki/Samsung_Galaxy_Express_SGH-I437_(samsung-expressatt)
- Downstream kernel (uses board files):
https://github.com/LineageOS/android_kernel_samsung_d2/blob/stable/cm-12.0-YNG4N/arch/arm/mach-msm/board-express.c

Note: These patches were assisted with AI (specifically Claude) as it
was easily able to translate the old board file into a DTS format that
mainline understands.

Signed-off-by: Rudraksha Gupta <guptarud@...il.com>
---
Rudraksha Gupta (4):
      ARM: dts: qcom: msm8960: expressatt: Add Light/Proximity Sensor
      ARM: dts: qcom: msm8960: expressatt: Add NFC
      ARM: dts: qcom: msm8960: expressatt: Add Magnetometer
      ARM: dts: qcom: msm8960: expressatt: Add Accelerometer

 .../dts/qcom/qcom-msm8960-samsung-expressatt.dts   | 109 +++++++++++++++++++++
 1 file changed, 109 insertions(+)
---
base-commit: a771210bab42017434c91411e16694ac4fd7afc2
change-id: 20251119-expressatt_nfc_accel_magn_light-f78e02897186
prerequisite-message-id: <176210698639.937813.643585209118839199.b4-ty@...nel.org>
prerequisite-patch-id: befdfe1948c2fbfb867597a6de917c8067fd57be
prerequisite-patch-id: 70a2b0837b9846d8a775f464295da73ca8ff26b4
prerequisite-patch-id: 20e005aa4312c3525e1b90f33a398189b9e2b3b7
prerequisite-patch-id: 970e0eb8af1736e4565fc37830576a67bf7b3227
prerequisite-patch-id: babd3b55d9ff28f19dbc3f7978742c58ef436aee

Best regards,
-- 
Rudraksha Gupta <guptarud@...il.com>