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From: Heiko =?UTF-8?B?U3TDvGJuZXI=?= <heiko@sntech.de>
To: naoki@radxa.com, Chukun Pan <amadeus@jmu.edu.cn>
Cc: amadeus@jmu.edu.cn, conor+dt@kernel.org, devicetree@vger.kernel.org,
 krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org,
 linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org
Subject: Re: [PATCH 1/1] arm64: dts: rockchip: remove RTC for Radxa E52C
Date: Thu, 08 Jan 2026 14:54:57 +0100
Message-ID: <2090167.kXSN5OTJKJ@diego>
In-Reply-To: <20260108123008.134323-1-amadeus@jmu.edu.cn>
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Am Donnerstag, 8. Januar 2026, 13:30:08 Mitteleurop=C3=A4ische Normalzeit s=
chrieb Chukun Pan:
> > V1.209 and later should have RTC. What version do you have?
>=20
> # 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=
=2E...|
>=20
> 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