From: "Heiko Stübner" <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 [thread overview]
Message-ID: <2090167.kXSN5OTJKJ@diego> (raw)
In-Reply-To: <20260108123008.134323-1-amadeus@jmu.edu.cn>
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
WARNING: multiple messages have this Message-ID (diff)
From: "Heiko Stübner" <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 [thread overview]
Message-ID: <2090167.kXSN5OTJKJ@diego> (raw)
In-Reply-To: <20260108123008.134323-1-amadeus@jmu.edu.cn>
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
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next prev parent reply other threads:[~2026-01-08 13:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-08 10:00 [PATCH 1/1] arm64: dts: rockchip: remove RTC for Radxa E52C Chukun Pan
2026-01-08 10:00 ` Chukun Pan
2026-01-08 10:17 ` FUKAUMI Naoki
2026-01-08 10:17 ` FUKAUMI Naoki
2026-01-08 12:30 ` Chukun Pan
2026-01-08 12:30 ` Chukun Pan
2026-01-08 13:54 ` Heiko Stübner [this message]
2026-01-08 13:54 ` Heiko Stübner
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