soc: arm: cypress: psoc6: Enable Cortex-M4

Configure Cortex-M0+ to start Cortex-M4 CPU.

Signed-off-by: Gerson Fernando Budke <gerson.budke@atl-electronics.com>

boards/arm/cy8ckit_062_ble/doc/index.rst

@@ -176,6 +176,59 @@ Cy_WDT_Disable().
 
    You should see "Hello World! cy8ckit_062_ble_m0" in your terminal.
 
+Running on Dual Core
+********************
+
+#. Build the Zephyr kernel and the :ref:`button-sample` sample application:
+
+   .. zephyr-app-commands::
+      :zephyr-app: samples/basic/button
+      :board: cy8ckit_062_ble_m4
+      :goals: build
+      :compact:
+
+#. If you have a USB-Serial adapter, you can connect SBC[UART]-6 on Arduino
+   header.  Schematic should be checked for connections.   Run your favorite
+   terminal program again now listen for another output.   Under Linux the
+   terminal should be :code:`/dev/ttyUSB0`. For example:
+
+   .. code-block:: console
+
+      $ minicom -D /dev/ttyUSB0 -o
+
+   The -o option tells minicom not to send the modem initialization
+   string. Connection should be configured as follows:
+
+      - Speed: 115200
+      - Data: 8 bits
+      - Parity: None
+      - Stop bits: 1
+
+#. To flash an image:
+
+   .. zephyr-app-commands::
+      :zephyr-app: samples/basic/button
+      :board: cy8ckit_062_ble_m4
+      :goals: flash
+      :compact:
+
+#. Configure Cortex-M0+ to enable Cortex-M4:
+
+   The last step flash the M4 image on the flash.  However, Cortex-M0 by default
+   doesn't start the M4 and nothing will happen.  To enable Cortex-M4 CPU,
+   repeat the steps on programming and debug and add the following parameter
+   when performing the build process.
+
+   .. zephyr-app-commands::
+      :zephyr-app: samples/hello_world
+      :board: cy8ckit_062_ble_m0
+      :goals: build flash
+      :gen-args: -DCONFIG_SOC_PSOC6_M0_ENABLES_M4=y
+      :compact:
+
+   Now you can press button SW-2 and see LED-9 blink at same time you have the
+   "Hello World! cy8ckit_062_ble_m0" in the your terminal.
+
 Board Revision
 **************
 

soc/arm/cypress/Kconfig

@@ -21,6 +21,12 @@ config SOC_PSOC6_M4
 
 endchoice
 
+config SOC_PSOC6_M0_ENABLES_M4
+	bool "Enable dual-core support [activate Cortex-M4]"
+	depends on SOC_PSOC6_M0
+	help
+	  Cortex-M0 CPU should boot Cortex-M4
+
 config SOC_FAMILY_PSOC6
 	bool
 

soc/arm/cypress/psoc6/soc.c

@@ -368,6 +368,10 @@ void Cy_SystemInit(void)
 	/* Configure peripheral clocks */
 	Cy_SysClk_PeriphSetDivider(CY_SYSCLK_DIV_8_BIT, 0u, 0u);
 	Cy_SysClk_PeriphEnableDivider(CY_SYSCLK_DIV_8_BIT, 0u);
+
+#if defined(CONFIG_SOC_PSOC6_M0_ENABLES_M4)
+	Cy_SysEnableCM4(DT_REG_ADDR(DT_NODELABEL(flash1)));
+#endif
 }
 
 static int init_cycfg_platform_wraper(const struct device *arg)