linux-kernel - [PATCH 1/2] dt-bindings: usb: mediatek,mtk-xhci: add keep-clock-on

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Date:   Mon, 2 Nov 2020 15:18:48 +0800
From:   Macpaul Lin <macpaul.lin@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     Ainge Hsu <ainge.hsu@...iatek.com>,
        Eddie Hung <eddie.hung@...iatek.com>,
        Mediatek WSD Upstream <wsd_upstream@...iatek.com>,
        Macpaul Lin <macpaul.lin@...iatek.com>,
        Macpaul Lin <macpaul@...il.com>
Subject: [PATCH 1/2] dt-bindings: usb: mediatek,mtk-xhci: add keep-clock-on

Option "mediatek,keep-clock-on" means to keep clock on during system
suspend and resume. Some platform will flush register settings if clock has
been disabled when system is suspended. Set this option to avoid clock off.

Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
---
 .../devicetree/bindings/usb/mediatek,mtk-xhci.yaml |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
index ea696c8..a956dde 100644
--- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
+++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
@@ -104,6 +104,12 @@ properties:
     description: enable USB remote wakeup, see power/wakeup-source.txt
     type: boolean
 
+  mediatek,keep-clock-on:
+    description: |
+      Keep clock on during system suspend and resume. Some platform will flush
+      register settings if clock has been disabled when system is suspended.
+    type: boolean
+
   mediatek,syscon-wakeup:
     $ref: /schemas/types.yaml#/definitions/phandle-array
     maxItems: 1
@@ -175,6 +181,7 @@ examples:
         imod-interval-ns = <10000>;
         mediatek,syscon-wakeup = <&pericfg 0x400 1>;
         wakeup-source;
+        mediatek,keep-clock-on;
         usb3-lpm-capable;
     };
 ...
-- 
1.7.9.5