doc: Add link of proprietary PSM in docs

Add link of proprietary PSM in the
following pages:

* Cellular: LwM2M Client
* LTE guide

Signed-off-by: divya pillai <[email protected]>

Author: divipillai

doc/nrf/links.txt

@@ -764,6 +764,7 @@
 .. _`nRF91x1 Power saving mode setting`: https://docs.nordicsemi.com/bundle/ref_at_commands_nrf91x1/page/REF/at_commands/nw_service/cpsms.html
 .. _`nRF91x1 modem trace activation %XMODEMTRACE`: https://docs.nordicsemi.com/bundle/ref_at_commands_nrf91x1/page/REF/at_commands/mob_termination_ctrl_status/xmodemtrace.html
 .. _`nRF91x1 UICC deactivation %UICCPOWERSAVE`: https://docs.nordicsemi.com/bundle/ref_at_commands_nrf91x1/page/REF/at_commands/access_uicc/uiccpowersave.html
+.. _`nRF91x1 Feature configuration %FEACONF`: https://docs.nordicsemi.com/bundle/ref_at_commands_nrf91x1/page/REF/at_commands/nw_service/feaconf_set.html
 
 .. _`nRF54L15 Datasheet`: https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/keyfeatures_html5.html
 .. _`nRF54L15 DK User Guide`: https://docs.nordicsemi.com/bundle/ug_nrf54l15_dk/page/UG/nRF54L15_DK/intro/intro.html

doc/nrf/protocols/lte/psm.rst

@@ -134,6 +134,7 @@ The length of the proprietary PSM sleep depends on the MO data or MO SMS cycles
 Typically, the T3412 timer is shorter when PSM is not used.
 
 It can be configured using the ``AT%FEACONF`` command.
+See `nRF91x1 Feature configuration %FEACONF`_ for more information.
 
 Reduced mobility
 ================

doc/nrf/test_and_optimize/optimizing/power_nrf91.rst

@@ -17,6 +17,8 @@ See the `Online Power Profiler user guide`_ for a basic overview of the tool and
 
 The following sections describe how you can use Online Power Profiler and other power profiling tools to optimize the power consumption in your nRF9160 DK.
 
+See the :ref:`cellular_psm` guide for more information on different power saving techniques.
+
 Cellular applications
 *********************
 

include/modem/lte_lc.h

@@ -1458,7 +1458,8 @@ int lte_lc_psm_req(bool enable);
 int lte_lc_psm_get(int *tau, int *active_time);
 
 /**
- * Request modem to enable or disable proprietary Power Saving Mode (PSM).
+ * Request modem to enable or disable
+ * [proprietary Power Saving Mode](https://docs.nordicsemi.com/bundle/ref_at_commands_nrf91x1/page/REF/at_commands/nw_service/feaconf_set.html).
  *
  * The purpose of the proprietary PSM feature is to perform a PSM-like sleep when network does not
  * allow normal PSM usage. During proprietary PSM, modem will fall to sleep in the same way than it

samples/cellular/lwm2m_client/sample_description.rst

@@ -444,6 +444,9 @@ This configuration disables eDRX, because it will request 10 seconds RAT and 12
 Proprietary PSM enables power saving when network does not allow PSM.
 The modem enters the PSM state after the configured RAT period when the connection is released.
 
+Proprietary PSM can be configured using the ``AT%FEACONF`` command.
+See `nRF91x1 Feature configuration %FEACONF`_ for more information.
+
 .. note::
 
    Proprietary PSM is only supported with modem firmware v2.x.
@@ -453,7 +456,6 @@ The modem enters the PSM state after the configured RAT period when the connecti
 
       <err> lte_lc: Failed to configure proprietary PSM, err -14
 
-
 Configuration for external FOTA
 -------------------------------