Add the System Timer Module description found on the NXP s32 platform
and the compatible for the s32g2 variant.

Cc: Ghennadi Procopciuc <ghennadi.procopciuc@oss.nxp.com>
Cc: Krzysztof Kozlowski <redacted>
Cc: Thomas Fossati <redacted>
Signed-off-by: Daniel Lezcano <redacted>
---
 .../bindings/timer/nxp,stm-timer.yaml         | 59 +++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/nxp,stm-timer.yaml

diff --git a/Documentation/devicetree/bindings/timer/nxp,stm-timer.yaml b/Documentation/devicetree/bindings/timer/nxp,stm-timer.yaml
new file mode 100644
index 000000000000..41093892c617
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/nxp,stm-timer.yaml

@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/nxp,stm-timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP System Timer Module (STM)
+
+maintainers:
+  - Daniel Lezcano <daniel.lezcano@kernel.org>
+
+description: |
+  The System Timer Module supports commonly required system and
+  application software timing functions. STM includes a 32-bit
+  count-up timer and four 32-bit compare channels with a separate
+  interrupt source for each channel. The timer is driven by the STM
+  module clock divided by an 8-bit prescale value.
+