diff --git a/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt b/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt
index a618d4787dd786b18d9aeb29139f9b69576b7e0e..64156993e052ddb09da963091a20320d27ad104d 100644
--- a/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt
@@ -10,8 +10,10 @@ Required properties:
 	interrupt source. The value must be 1.
 - compatible: Should contain "mbvl,gpex40-pcie"
 - reg: Should contain PCIe registers location and length
+	Mandatory:
 	"config_axi_slave": PCIe controller registers
 	"csr_axi_slave"	  : Bridge config registers
+	Optional:
 	"gpio_slave"	  : GPIO registers to control slot power
 	"apb_csr"	  : MSI registers