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

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Date:   Mon,  8 Jun 2020 21:26:53 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     f.fainelli@...il.com, gregkh@...uxfoundation.org, wahrenst@....net,
        robh@...nel.org, mathias.nyman@...ux.intel.com,
        Eric Anholt <eric@...olt.net>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-usb@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>
Cc:     linux-kernel@...r.kernel.org, tim.gover@...pberrypi.org,
        helgaas@...nel.org, lorenzo.pieralisi@....com,
        Rob Herring <robh+dt@...nel.org>
Subject: [PATCH 1/9] dt-bindings: reset: Add a binding for the RPi Firmware USB reset

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@...e.de>
---
 .../arm/bcm/raspberrypi,bcm2835-firmware.yaml | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

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>;
+        };
     };
 ...
-- 
2.26.2