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52 lines
2.0 KiB
Diff
52 lines
2.0 KiB
Diff
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From 2ec33e4040ebcd7fcfbeb3a559bb58c207f64a99 Mon Sep 17 00:00:00 2001
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From: Tiago Freire <41837236+tiagofreire-pt@users.noreply.github.com>
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Date: Tue, 23 Jan 2024 12:10:24 +0000
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Subject: [PATCH 0847/1085] Improvement on backup-switchover-mode overlay value
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definitions (#5884)
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For the RV3028 RTC, the definitions for its `backup-switchover-mode` overlay
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were not intelligible neither complete/exhaustive.
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Accordingly to the https://github.com/raspberrypi/linux/issues/2912#issuecomment-477670051
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these one here proposed should be correct.
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`/boot/config.txt` should be as a configuration example, for rv3028, on a
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Uputronics GPS Extension HAT:
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# For GPS Expansion Board from Uputronics
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dtparam=i2c_arm=on
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dtoverlay=i2c-rtc,rv3028,backup-switchover-mode=3
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dtoverlay=pps-gpio,gpiopin=18
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init_uart_baud=115200
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From my tests (`sudo rmmod rtc_rv3028 && sudo i2cget -y 1 0x52 0x37`):
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`Default from factory`: `0x10`
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`Mode 0`: `0x10`
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`Mode 1`: `0x14`
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`Mode 2`: `0x18`
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`Mode 3`: `0x1c`
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`Mode 3`: `0x1c` is consistent with the manufacturer configuration script: http://store.uputronics.com/files/configure-rv3028.sh
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---
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arch/arm/boot/dts/overlays/README | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -2112,7 +2112,13 @@ Params: abx80x Select o
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source
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backup-switchover-mode Backup power supply switch mode. Must be 0 for
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- off or 1 for Vdd < VBackup (RV3028, RV3032)
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+ "Switchover disabled", 1 for "Direct Switching"
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+ (if Vdd < VBackup), 2 for "Standby
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+ Mode" (if Vdd < Vbackup,
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+ does not draw current) or 3 for
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+ "Level Switching" (if Vdd < Vbackup
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+ and Vdd < Vddsw and Vbackup > Vddsw)
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+ (RV3028, RV3032)
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Name: i2c-rtc-gpio
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