Following peripherals are optional on phyCORE-STM32MP15x following
PHYTEC standard SoM variants: external RTC, EEPROM, SPI NOR.
Also NAND (fmc) can be populated instead of eMMC (sdmmc2).

So disable those peripherals on SoM dtsi file and enable them on board
dts file.
Additionally, enable by default the "DTS" SoC IP on common SoM dtsi file
as it is not an optional IP in STM32MP15x SoC.

Signed-off-by: Christophe Parant <c.parant@phytec.fr>
---
 arch/arm/boot/dts/st/stm32mp157c-phyboard-sargas-rdk.dts | 8 --------
 arch/arm/boot/dts/st/stm32mp15xx-phycore-som.dtsi        | 9 ++++++++-
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/arm/boot/dts/st/stm32mp157c-phyboard-sargas-rdk.dts b/arch/arm/boot/dts/st/stm32mp157c-phyboard-sargas-rdk.dts
index f7c02a381304..c90b12a479c9 100644
--- a/arch/arm/boot/dts/st/stm32mp157c-phyboard-sargas-rdk.dts
+++ b/arch/arm/boot/dts/st/stm32mp157c-phyboard-sargas-rdk.dts
@@ -22,14 +22,6 @@ &cryp1 {
 	status = "okay";
 };
 
-&dts {
-	status = "okay";
-};
-
-&fmc {
-	status = "disabled";
-};
-
 &gpu {
 	status = "okay";
 };
diff --git a/arch/arm/boot/dts/st/stm32mp15xx-phycore-som.dtsi b/arch/arm/boot/dts/st/stm32mp15xx-phycore-som.dtsi
index ce859b94ae26..3f60f184978c 100644
--- a/arch/arm/boot/dts/st/stm32mp15xx-phycore-som.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp15xx-phycore-som.dtsi
@@ -265,11 +265,13 @@ i2c4_eeprom: eeprom@50 {
 		compatible = "microchip,24c32",
 			     "atmel,24c32";
 		reg = <0x50>;
+		status = "disabled";
 	};
 
 	i2c4_rtc: rtc@52 {
 		compatible = "microcrystal,rv3028";
 		reg = <0x52>;
+		status = "disabled";
 	};
 };
 
@@ -307,7 +309,7 @@ &qspi_bk1_sleep_pins_a
 		     &qspi_cs1_sleep_pins_a>;
 	reg = <0x58003000 0x1000>,
 	      <0x70000000 0x1000000>;
-	status = "okay";
+	status = "disabled";
 
 	flash0: flash@0 {
 		compatible = "winbond,w25q128", "jedec,spi-nor";
@@ -328,6 +330,10 @@ &rtc {
 	status = "okay";
 };
 
+&dts {
+	status = "okay";
+};
+
 &sdmmc2 {
 	pinctrl-names = "default", "opendrain", "sleep";
 	pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_d47_pins_e>;
@@ -341,4 +347,5 @@ &sdmmc2 {
 	vmmc-supply = <&v3v3>;
 	vqmmc-supply = <&v3v3>;
 	mmc-ddr-3_3v;
+	status = "disabled";
 };
-- 
2.34.1