[PATCH v2 1/1] dt-bindings: net: rfkill-gpio: document reset-gpios

[Chukun Pan <amadeus@xxxxxxxxxx>]

Some 5G WWAN modems have multiple gpio controls. When using rfkill command
to manage it, we need to at least change the status of reset and shutdown
gpios at the same time. Also, it might be incorrect to put the reset gpio
at usb when the module is connected via USB M2 slot, there may be other
devices connected under some USB node, but the reset gpio is only used for
the WWAN module. So document the reset-gpios to rfkill-gpio as an optional
property and add it to a new example.

For example:
  - reset: modem Reset#
  - shutdown: modem WWAN_DISABLE# or FULL_CARD_POWER_OFF#

Signed-off-by: Chukun Pan <amadeus@xxxxxxxxxx>
---
 .../devicetree/bindings/net/rfkill-gpio.yaml       | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/rfkill-gpio.yaml b/Documentation/devicetree/bindings/net/rfkill-gpio.yaml
index 9630c8466fac..7f297efdc976 100644
--- a/Documentation/devicetree/bindings/net/rfkill-gpio.yaml
+++ b/Documentation/devicetree/bindings/net/rfkill-gpio.yaml
@@ -29,6 +29,9 @@ properties:
       - wlan
       - wwan
 
+  reset-gpios:
+    maxItems: 1
+
   shutdown-gpios:
     maxItems: 1
 
@@ -49,3 +52,14 @@ examples:
         radio-type = "wlan";
         shutdown-gpios = <&gpio2 25 GPIO_ACTIVE_HIGH>;
     };
+
+  - | # 5G WWAN modem
+    #include <dt-bindings/gpio/gpio.h>
+
+    rfkill {
+        compatible = "rfkill-gpio";
+        label = "rfkill-modem";
+        radio-type = "wwan";
+        reset-gpios = <&gpio0 5 GPIO_ACTIVE_HIGH>;
+        shutdown-gpios = <&gpio0 6 GPIO_ACTIVE_HIGH>;
+    };
-- 
2.25.1