From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-3.mta0.migadu.com [91.218.175.3]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B57D441A785 for ; Sat, 12 Sep 2026 15:48:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.3 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789228140; cv=none; b=mLx7finSpEqGTOU9qS+kbhaXLadWnwJwsEpnk8+pKBXdk8h2c5LVFm8qx+cqaASORzSi4UZvzXeKNpHEayTIBJ59uooi6uvVzScBaSaoxsN2uTFgOibupPAfRRk7jRjOJExEFnTvHV5ep/OIvz2np3WN+ACgxacgGPKrQwm2UNU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789228140; c=relaxed/simple; bh=7Xxdw0BpYVeSsVYvjnUMpQGHZK67v9pQzvF+pta/r2k=; h=Mime-Version:Content-Type:Date:Message-Id:Cc:Subject:From:To: References:In-Reply-To; b=nh+DwWI2Ne8oLt9stdTzypwFry6EuJErpBA07egWVWS3x6xO7sKu45Zt3c3DFSH7xseeC4oNGsGKg2eGkpwaQfkMJVVWULKFn/Y7sGhxl0OooLRV4VTLxi0yk4lGluwAvd9Gx3+OK8SOjg31Mo4RYi3oB0I7n0nsRek9SmsqMik= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=cknow-tech.com; spf=pass smtp.mailfrom=cknow-tech.com; dkim=pass (2048-bit key) header.d=cknow-tech.com header.i=@cknow-tech.com header.b=jtWBlZvu; arc=none smtp.client-ip=91.218.175.3 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=cknow-tech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cknow-tech.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cknow-tech.com header.i=@cknow-tech.com header.b="jtWBlZvu" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=7Xxdw0BpYVeSsVYvjnUMpQGHZK67v9pQzvF+pta/r2k=; c=simple/simple; d=cknow-tech.com; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789228135; v=1; x=1789832935; b=jtWBlZvuvS7+BgGr4dZSQnEoaFTAqoHZWo6YPzn/vDM9GNWzVDcTl2BhEe6g+dwbTRNTvbnd RZavAPp0l7kVXvovMev9f/5LS9mng2aTS0kPhhWwUalRtyugeUCWTmiFF4j/jUrVECRwMS3RhSC iqNtBV6xanaGzUlH1blXIkHTnkAjx1T3VtQDmMusmhQR7r7WuBx769LptoJivx1UgrCNnvuNxjj 7wtkB8dg1nsfcYiANnors7R+d8rH34krSDFUr9xX6Rf4PL3TU0O4wO/CZcJL4IOkmmKfucXjQVy +wY9PVMEHd9n7XRJNqAh+xxYgPqz/uxZYOAexsulVUBdg== X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 835f230ca6fc7137; Sat, 12 Sep 2026 15:48:55 +0000 X-Mizu-Trace-ID: 835f230ca6fc7137 X-Migadu-Flow: FLOW_OUT Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Sat, 12 Sep 2026 17:48:52 +0200 Message-Id: Cc: "Ricardo Pardini" , , , , Subject: Re: [PATCH] arm64: dts: rockchip: Fix i2c6 clock-frequency on NanoPC-T6 From: "Diederik de Haas" To: "Diederik de Haas" , "Heiko Stuebner" , "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" X-Mailer: aerc 0.22.0-9-ge948bb7230f4 References: <20260911152911.2088363-1-diederik@cknow-tech.com> <2071782.usQuhbGJ8B@phil> In-Reply-To: On Sat Sep 12, 2026 at 4:16 PM CEST, Diederik de Haas wrote: > On Sat Sep 12, 2026 at 2:41 PM CEST, Heiko Stuebner wrote: >> Am Freitag, 11. September 2026, 17:28:33 Mitteleurop=C3=A4ische Sommerze= it schrieb Diederik de Haas: >>> The i2c6 bus needs to run at 200kHz, because at the default frequency o= f >>> 100kHz it may fail to find the RTC resulting in warnings/errors like >>>=20 >>> rtc-hym8563 6-0051: no valid clock/calendar values available >>> rtc-hym8563 6-0051: hctosys: unable to read the hardware clock >>>=20 >>> But only sometimes. This should not happen when there is a battery back= ing >>> the RTC, yet it does ... sometimes. >> >> I'm confused, shouldn't a slower clock always work? >> Like I understand how a clock that is too fast can cause issues due >> to hardware limitations, but running the bus slower somehow shouldn't >> cause issues? > > Impeccable timing ... as I was just about to retract this patch. > > So please ignore/drop this and sorry for the noise. https://github.com/rockchip-linux/kernel/commit/815c9a084e62d700ab5487974b6= 3035e772a29a4 "remove the buf[0] & HYM8563_SEC_VL, it's unsuitable for some hym8563. set rtc init time for first power on." I guess I have 'some hym8563' in both my NanoPC-T6 LTS & Plus :-/ The one in my NanoPi R5S works great, so I'll just use/depend on that one.