linux-kernel - [PATCH v2 1/2] dt-bindings: usb: mediatek,mtk-xhci: add str-clock-on

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Message-ID: <1604655965-22418-1-git-send-email-macpaul.lin@mediatek.com>
Date:   Fri, 6 Nov 2020 17:46:04 +0800
From:   Macpaul Lin <macpaul.lin@...iatek.com>
To:     Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>
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>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>
Subject: [PATCH v2 1/2] dt-bindings: usb: mediatek,mtk-xhci: add str-clock-on

Option "mediatek,str-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.

Change-Id: Id841f58e9d7fb3656511072b3eb14d0d355e2dd5
Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
---
Changes for v2:
  - Rename "mediatek,keep-clock-on" to "mediatek,str-clock-on" which implies
    this option related to STR functions.
  - After discussion with Chunfeng, resend dt-bindings descritption based on
    mediatek,mtk-xhci.txt instead of yaml format.

 .../devicetree/bindings/usb/mediatek,mtk-xhci.txt  |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
index 42d8814..fc93bcf 100644
--- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
+++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
@@ -37,6 +37,9 @@ Required properties:
 
 Optional properties:
  - wakeup-source : enable USB remote wakeup;
+ - mediatek,str-clock-on: Keep clock on during system suspend and resume.
+	Some platform will flush register settings if clock has been disabled
+	when system is suspended.
  - mediatek,syscon-wakeup : phandle to syscon used to access the register
 	of the USB wakeup glue layer between xHCI and SPM; it depends on
 	"wakeup-source", and has two arguments:
-- 
1.7.9.5