linux-kernel - Re: [PATCH 1/1] arm64: dts: rockchip: remove RTC for Radxa E52C

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Message-ID: <2090167.kXSN5OTJKJ@diego>
Date: Thu, 08 Jan 2026 14:54:57 +0100
From: Heiko Stübner <heiko@...ech.de>
To: naoki@...xa.com, Chukun Pan <amadeus@....edu.cn>
Cc: amadeus@....edu.cn, conor+dt@...nel.org, devicetree@...r.kernel.org,
 krzk+dt@...nel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 1/1] arm64: dts: rockchip: remove RTC for Radxa E52C

Am Donnerstag, 8. Januar 2026, 13:30:08 Mitteleuropäische Normalzeit schrieb Chukun Pan:
> > V1.209 and later should have RTC. What version do you have?
> 
> # hexdump -C /sys/bus/i2c/devices/0-0050/eeprom
> 00000070  0c 00 00 00 01 00 56 31  2e 32 30 38 00 00 89 0b  |......V1.208....|
> 
> How should we handle the older versions?

I think we might want an dt-overlay for this.

As the value can be read from the eeprom, you could even add code to the
board in u-boot to set the "fdtoverlay" variable automatically for extlinux.


Heiko