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Message-Id: <20201116064147.12062-1-christianshewitt@gmail.com>
Date: Mon, 16 Nov 2020 06:41:47 +0000
From: Christian Hewitt <christianshewitt@...il.com>
To: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Kevin Hilman <khilman@...libre.com>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Christian Hewitt <christianshewitt@...il.com>,
Artem Lapkin <art@...das.com>
Subject: [PATCH] arm64: dts: meson: enable rtc node on Khadas VIM1/VIM2 boards
Enable the rtc node on VIM1/VIM2 boards so users can simply attach a power
cell and use the on-board RTC without modifying the device-tree.
Cold boot with no cell attached is gracefully handled:
VIM2:~ # dmesg | grep rtc
[ 7.716150] rtc-hym8563 1-0051: no valid clock/calendar values available
[ 7.716957] rtc-hym8563 1-0051: registered as rtc0
[ 7.729850] rtc-hym8563 1-0051: no valid clock/calendar values available
[ 7.729877] rtc-hym8563 1-0051: hctosys: unable to read the hardware clock
[ 8.126768] rtc-hym8563 1-0051: no valid clock/calendar values available
Warm boot (and any boot with cell attached) recalls stored values resulting
in consistently faster (re)boot times:
VIM2:~ # dmesg | grep rtc
[ 7.441671] rtc-hym8563 1-0051: registered as rtc0
[ 7.442663] rtc-hym8563 1-0051: setting system clock to 2020-11-16T05:49:59 UTC (1605505799)
Suggested-by: Artem Lapkin <art@...das.com>
Signed-off-by: Christian Hewitt <christianshewitt@...il.com>
---
This supersedes other recent attempts by Art to make the same change [0]
and [1] which were rejected for lack of justification for the change and
leaving comments behind. I have been using the same changes in my own
tree for a while.
Christian
[0] https://patchwork.kernel.org/project/linux-amlogic/patch/20200925033017.1790973-8-art@khadas.com/
[1] https://patchwork.kernel.org/project/linux-amlogic/patch/20200925033017.1790973-9-art@khadas.com/
arch/arm64/boot/dts/amlogic/meson-gxl-s905x-khadas-vim.dts | 3 +--
arch/arm64/boot/dts/amlogic/meson-gxm-khadas-vim2.dts | 3 +--
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-khadas-vim.dts b/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-khadas-vim.dts
index 8bcdffdf55d0..638a5992d760 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-khadas-vim.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-khadas-vim.dts
@@ -97,8 +97,7 @@
pinctrl-names = "default";
rtc: rtc@51 {
- /* has to be enabled manually when a battery is connected: */
- status = "disabled";
+ status = "okay";
compatible = "haoyu,hym8563";
reg = <0x51>;
#clock-cells = <0>;
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxm-khadas-vim2.dts b/arch/arm64/boot/dts/amlogic/meson-gxm-khadas-vim2.dts
index bff8ec2c1c70..da000c10b945 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxm-khadas-vim2.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-gxm-khadas-vim2.dts
@@ -228,8 +228,7 @@
pinctrl-names = "default";
rtc: rtc@51 {
- /* has to be enabled manually when a battery is connected: */
- status = "disabled";
+ status = "okay";
compatible = "haoyu,hym8563";
reg = <0x51>;
#clock-cells = <0>;
--
2.17.1
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