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mvebu: Disable internal RTC on Linksys devices

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The internal RTC does not work correctly on these Linksys boards based
on Marvell SoCs. It is off by 3 minutes in 10 minutes running, this
was reported by multiple users. On the Linksys Mamba device the device
tree comment says that no crystal is connected to the internal RTC, this
is probably also true for the other devices.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Hauke Mehrtens 2018-03-17 15:52:47 +01:00
parent dfe4de0287
commit 8605ac87f8
1 changed files with 28 additions and 0 deletions
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28
target/linux/mvebu/patches-4.14/423-ARM-dts-armada-385-linksys-Disable-internal-RTC.patch Normal file
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@ -0,0 +1,28 @@
From e1cac198fea08c31ec204bed84c279ab05d20389 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sat, 17 Mar 2018 15:22:25 +0100
Subject: ARM: dts: armada-385-linksys: Disable internal RTC
The internal RTC does not work correctly on these Linksys boards based
on Marvell SoCs. For me it only shows Wed Dec 31 23:59:59 1969 and for
others it is off by 3 minutes in 10 minutes running, this was reported
by multiple users. On the Linksys Mamba device the device tree comment
says that no crystal is connected to the internal RTC, this is probably
also true for the other devices.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
arch/arm/boot/dts/armada-385-linksys.dtsi | 5 +++++
1 file changed, 5 insertions(+)
--- a/arch/arm/boot/dts/armada-385-linksys.dtsi
+++ b/arch/arm/boot/dts/armada-385-linksys.dtsi
@@ -302,3 +302,8 @@
status = "okay";
usb-phy = <&usb3_1_phy>;
};
+
+&rtc {
+ /* No crystal connected to the internal RTC */
+ status = "disabled";
+};