arm64: dts: marvell: 7040-db: Document the gpio expander

Document all the GPIO of the expander based on the schematics

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

diff --git a/arch/arm64/boot/dts/marvell/armada-7040-db.dts b/arch/arm64/boot/dts/marvell/armada-7040-db.dts
index 8f3b395c786c949fb8d34b154366b0067c7d4b04..18a75fad1e8de7e048a0f047532ae6af9c6b4f5a 100644 (file)
--- a/arch/arm64/boot/dts/marvell/armada-7040-db.dts
+++ b/arch/arm64/boot/dts/marvell/armada-7040-db.dts
@@ -143,6 +143,16 @@
                gpio-controller;
                #gpio-cells = <2>;
                reg = <0x21>;
+               /*
+                * IO0_0: USB3_PWR_EN0  IO1_0: USB_3_1_Dev_Detect
+                * IO0_1: USB3_PWR_EN1  IO1_1: USB2_1_current_limit
+                * IO0_2: DDR3_4_Detect IO1_2: Hcon_IO_RstN
+                * IO0_3: USB2_DEVICE_DETECT
+                * IO0_4: GPIO_0        IO1_4: SD_Status
+                * IO0_5: GPIO_1        IO1_5: LDO_5V_Enable
+                * IO0_6: IHB_5V_Enable IO1_6: PWR_EN_eMMC
+                * IO0_7:               IO1_7: SDIO_Vcntrl
+                */
        };
 };