From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 985D0D185FC for ; Thu, 8 Jan 2026 13:55:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=G8UJ8c/YdbF7K7cam1fQP7rJ2G+VG0sxNQemUdaEvgE=; b=zGsHE0NE/PZ6LAfgzBRQggOqKH bjil8Ps/OWyntFAYvB5UAetUP1Xz2o9IcF5vIqWb0xiJw8MVN6RK9MWbsU/qmefWPO/62pQ3jxewh dhAN63hrMIwAfBEL3Iwz3qFzuuS9gX6bBqP4q6iAOA8oNPQkNYRwyV4cSeDtJ5NedtcaGFwFCWUfF VHL+xTZ+0wP5j2eTYHdH5Al/3iY8+nT/ACvayIRKE71zaXXKT1/AYM+J+0CxchWU46HtEyxrcAqCx NqQkjJ6abrqDnA8K0XFJSsGsteXZqQXsB0veLtH+AViRdp3o+9PMfM9JGRWmGROCIO3BqCr9/77Us OuJRRPoQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vdqU0-0000000HF9M-0jOs; Thu, 08 Jan 2026 13:55:25 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vdqTy-0000000HF8T-0BQy; Thu, 08 Jan 2026 13:55:23 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sntech.de; s=gloria202408; h=Content-Type:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Reply-To; bh=G8UJ8c/YdbF7K7cam1fQP7rJ2G+VG0sxNQemUdaEvgE=; b=2on3GKlU5bki7VzOeETLHDYUaP ArDx0fY+yaTtcnAfKuUrhHZ83nAt2SQF2TeOydKhWAtMhKL5uAFfRhkC755kz9HxjEPKg+BNZnaNf FX2tvJth+t2V/a0kOHN0xrBMlQxb6OxCqqJOJpu4dI4BWTNgVq58AochQdbDQ58HjrX+EFMSRbI5y UoN8chwJvjg5rehokBF6XGEcML0GbPeR+hr1scJo5Hdg6mpLkAkLHIoMkvSPDWEbFOSFKh04DzaHt nU8A36wOBr1f4fR8Ba30gDnIh7N7N22cWqG7rJit5FtfuXC4pjSSA2K3iEHiMfsePKwfzlM5DSFOu EAO6E2Rg==; Received: from i53875a63.versanet.de ([83.135.90.99] helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1vdqTa-001VS8-9b; Thu, 08 Jan 2026 14:54:58 +0100 From: Heiko =?UTF-8?B?U3TDvGJuZXI=?= To: naoki@radxa.com, Chukun Pan 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> References: <6547200DD4E67155+b1fb1848-2f11-4b3e-b556-9386373d23f1@radxa.com> <20260108123008.134323-1-amadeus@jmu.edu.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260108_055522_107743_752070D2 X-CRM114-Status: GOOD ( 11.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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