dt-bindings: spi: rockchip-sfc: Add reset-gpios property

For Octal flash, it is possible that the pre Kenrel stage has
already been initialized to a specific IO mode in the flash.
To avoid abnormal initialization processes, it is necessary to
reset the device first.

Change-Id: I7a80aa510758697022ef2b9af7b6364e7d253ce7
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

Documentation/devicetree/bindings/spi/rockchip-sfc.yaml

@@ -63,6 +63,7 @@ Optional properties:
   - sfc-cs-gpios: specifies the gpio pins to be used for chipselects.
     The gpios will be referred to as reg = <index> in the SPI child nodes.
     If unspecified, a single SPI device without a chip select can be used.
+  - reset-gpios: specifies the reset gpio pin to be used for reseting the devices.
 
 unevaluatedProperties: false
 
@@ -82,6 +83,7 @@ examples:
         pinctrl-names = "default";
         power-domains = <&power PX30_PD_MMC_NAND>;
         sfc-cs-gpios = <&gpio4 RK_PB0 GPIO_ACTIVE_LOW>, <&gpio4 RK_PA5 GPIO_ACTIVE_LOW>;
+        reset-gpios = <&gpio1 RK_PB0 GPIO_ACTIVE_LOW>;
         #address-cells = <1>;
         #size-cells = <0>;