[1/9] dt-bindings: reset: Add a binding for the RPi Firmware USB reset

Message ID 20200608192701.18355-2-nsaenzjulienne@suse.de
State New
Headers show
Series
  • Raspberry Pi 4 USB firmware initialization rework
Related show

Commit Message

Nicolas Saenz Julienne June 8, 2020, 7:26 p.m.
The firmware running on the RPi VideoCore can be used to reset and
initialize the board's xHCI controller. The reset controller is passed
to the PCI device through the DT, hence this binding.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 .../arm/bcm/raspberrypi,bcm2835-firmware.yaml | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

Patch

diff --git a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml
index b48ed875eb8e..8f9d0986c28f 100644
--- a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml
+++ b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml
@@ -39,6 +39,22 @@  properties:
       - compatible
       - "#clock-cells"
 
+  usb-reset:
+    type: object
+
+    properties:
+      compatible:
+        const: raspberrypi,firmware-usb-reset
+
+      "#clock-cells":
+        const: 0
+        description: >
+          There is only one reset line available, so no need for cell decoding.
+
+    required:
+      - compatible
+      - "#reset-cells"
+
     additionalProperties: false
 
 required:
@@ -55,5 +71,10 @@  examples:
             compatible = "raspberrypi,firmware-clocks";
             #clock-cells = <1>;
         };
+
+        usb_reset: usb-reset {
+            compatible = "raspberrypi,firmware-usb-reset";
+            #reset-cells = <0>;
+        };
     };
 ...