Documentation/risc-v: Add LP_I2C docs for esp32[-c6]

Add LP_I2C docs for esp32c6

Signed-off-by: Eren Terzioglu <[email protected]>

Author: eren-terzioglu

Documentation/platforms/risc-v/esp32c6/boards/esp32c6-devkitc/index.rst

@@ -265,6 +265,11 @@ You can scan for all I2C devices using the following command::
 
     nsh> i2c dev 0x00 0x7f
 
+To use LP_I2C, you can enable `ESPRESSIF_LP_I2C0` option.  When this option is enabled,
+LP_I2C operates on GPIO7 as SCL and GPIO6 as SDA. These pins are fixed and cannot be changed.
+Also enabling LP_I2C will change the default pins of I2C0 due to LP_I2C pin limitation.
+The default I2C0 pins will be remapped to GPIO23 for SCL and GPIO5 for SDA.
+
 To use slave mode, you can enable `ESPRESSIF_I2C0_SLAVE_MODE` option.
 To use slave mode driver following snippet demonstrates how write to i2c bus
 using slave driver:

Documentation/platforms/risc-v/esp32c6/boards/esp32c6-devkitm/index.rst

@@ -210,6 +210,11 @@ You can scan for all I2C devices using the following command::
 
     nsh> i2c dev 0x00 0x7f
 
+To use LP_I2C, you can enable `ESPRESSIF_LP_I2C0` option.  When this option is enabled,
+LP_I2C operates on GPIO7 as SCL and GPIO6 as SDA. These pins are fixed and cannot be changed.
+Also enabling LP_I2C will change the default pins of I2C0 due to LP_I2C pin limitation.
+The default I2C0 pins will be remapped to GPIO23 for SCL and GPIO5 for SDA.
+
 To use slave mode, you can enable `ESPRESSIF_I2C0_SLAVE_MODE` option.
 To use slave mode driver following snippet demonstrates how write to i2c bus
 using slave driver:

Documentation/platforms/risc-v/esp32c6/index.rst

@@ -346,7 +346,7 @@ ECC              No
 eFuse            Yes
 GPIO             Yes     Dedicated GPIO supported
 HMAC             No
-I2C              Yes     Master and Slave mode supported
+I2C              Yes     Master and Slave mode also LPI2C supported
 I2S              Yes
 LED/PWM          Yes
 MCPWM            Yes