boards: arm: nucleo_h743zi: enable backup SRAM

Enable backup SRAM DT node and update documentation.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

boards/arm/nucleo_h743zi/doc/index.rst

@@ -94,31 +94,33 @@ Supported Features
 The Zephyr nucleo_h743zi board configuration supports the following hardware
 features:
 
-+-----------+------------+-------------------------------------+
-| Interface | Controller | Driver/Component                    |
-+===========+============+=====================================+
-| NVIC      | on-chip    | nested vector interrupt controller  |
-+-----------+------------+-------------------------------------+
-| UART      | on-chip    | serial port                         |
-+-----------+------------+-------------------------------------+
-| PINMUX    | on-chip    | pinmux                              |
-+-----------+------------+-------------------------------------+
-| GPIO      | on-chip    | gpio                                |
-+-----------+------------+-------------------------------------+
-| RTC       | on-chip    | counter                             |
-+-----------+------------+-------------------------------------+
-| I2C       | on-chip    | i2c                                 |
-+-----------+------------+-------------------------------------+
-| PWM       | on-chip    | pwm                                 |
-+-----------+------------+-------------------------------------+
-| ADC       | on-chip    | adc                                 |
-+-----------+------------+-------------------------------------+
-| RNG       | on-chip    | True Random number generator        |
-+-----------+------------+-------------------------------------+
-| ETHERNET  | on-chip    | ethernet                            |
-+-----------+------------+-------------------------------------+
-| SPI       | on-chip    | spi                                 |
-+-----------+------------+-------------------------------------+
++-------------+------------+-------------------------------------+
+| Interface   | Controller | Driver/Component                    |
++=============+============+=====================================+
+| NVIC        | on-chip    | nested vector interrupt controller  |
++-------------+------------+-------------------------------------+
+| UART        | on-chip    | serial port                         |
++-------------+------------+-------------------------------------+
+| PINMUX      | on-chip    | pinmux                              |
++-------------+------------+-------------------------------------+
+| GPIO        | on-chip    | gpio                                |
++-------------+------------+-------------------------------------+
+| RTC         | on-chip    | counter                             |
++-------------+------------+-------------------------------------+
+| I2C         | on-chip    | i2c                                 |
++-------------+------------+-------------------------------------+
+| PWM         | on-chip    | pwm                                 |
++-------------+------------+-------------------------------------+
+| ADC         | on-chip    | adc                                 |
++-------------+------------+-------------------------------------+
+| RNG         | on-chip    | True Random number generator        |
++-------------+------------+-------------------------------------+
+| ETHERNET    | on-chip    | ethernet                            |
++-------------+------------+-------------------------------------+
+| SPI         | on-chip    | spi                                 |
++-------------+------------+-------------------------------------+
+| Backup SRAM | on-chip    | Backup SRAM                         |
++-------------+------------+-------------------------------------+
 
 Other hardware features are not yet supported on this Zephyr port.
 
@@ -156,6 +158,12 @@ Serial Port
 Nucleo H743ZI board has 4 UARTs and 4 USARTs. The Zephyr console output is
 assigned to UART3. Default settings are 115200 8N1.
 
+Backup SRAM
+-----------
+
+In order to test backup SRAM you may want to disconnect VBAT from VDD. You can
+do it by removing ``SB156`` jumper on the back side of the board.
+
 Programming and Debugging
 *************************
 

boards/arm/nucleo_h743zi/nucleo_h743zi.dts

@@ -118,6 +118,10 @@
 	pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6 &spi1_mosi_pb5>;
 };
 
+&backup_sram {
+	status = "okay";
+};
+
 &flash0 {
 	partitions {
 		compatible = "fixed-partitions";

boards/arm/nucleo_h743zi/nucleo_h743zi.yaml

@@ -19,3 +19,4 @@ supported:
   - adc
   - netif:eth
   - spi
+  - backup_sram