From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from www537.your-server.de (www537.your-server.de [188.40.3.216]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 85C6342466A; Tue, 6 Oct 2026 13:50:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=188.40.3.216 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791294618; cv=none; b=Cn/YtRjNwvKqubfhEeuUjEV2rERyR2ZcMJ/0xREAa+AhrckXT+osjbq233SqcL+PEQJBfTZPL3eFbfdTuV8IOfK6I5TngTHe6SQ8qrtP8cHHh4j9/5Pgmhwcm3upRlRWPIyK5Xk+BzHgaCtrsEx4dhqRZ9KWsOem80xfRnVxJ/A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791294618; c=relaxed/simple; bh=DT5txDVCV5tJYy6dofM6dMgaFWd8I+eKNa+vcYFGUOI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DFLFNrfDx1gvx0xVwvt01Pnvb085NOeWVw6QgF80o1VFxd5tzybr4E5kyRRdg1JGj01wsFMbKVQ4D14dg6fEnVINo5MwjhLpZ1YE7OtFzZuNxk2r+ES+QRoMsdoMnMOdXqf1Hj4kqrue0gnd6mgavBTl1XAL5yTHSzLcURAtlwU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ew.tq-group.com; spf=pass smtp.mailfrom=ew.tq-group.com; dkim=pass (2048-bit key) header.d=ew.tq-group.com header.i=@ew.tq-group.com header.b=WQmTZ+Zp; arc=none smtp.client-ip=188.40.3.216 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ew.tq-group.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ew.tq-group.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ew.tq-group.com header.i=@ew.tq-group.com header.b="WQmTZ+Zp" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=ew.tq-group.com; s=default2602; h=Content-Type:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID; bh=LtXewEIARdqyNa+0KtGlyoZpihGzkV6HOi575K/RB5Q=; b=WQmTZ+ZpkQpI5Io8Ikjpil6eSn LzHhNYn2S/Iu02bFCzbzdd+EImJPzx82KivwCE5hAIIQR5oBJ0XkGgDvH8wzk0lC70rOCbok2w6vy Cho8atTDDDc0WWZWkTOa02D99YNVZy7B+MVqKZvjdnPK47sHgWGHmmFMi41uZ85/+AhB0Z1p9ig1t x2LpNPU/BdIugERqvDDmu8sezY6Dz5UFC3iZwoS6E8ProWWBsxRIIx3BNPxx1hdc/LzRzdzqvHTbV 0yXgVYpOhCFwhqFT4zga8K0MEqKVIs//62N9pATU15UnYbUDJbEOtUG0PWCNjGDUQpqalLlcwmG30 u6Ola9nw==; Received: from sslproxy05.your-server.de ([78.46.172.2]) by www537.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1xE5Yb-000Fzm-38; Tue, 06 Oct 2026 15:50:14 +0200 Received: from localhost ([127.0.0.1]) by sslproxy05.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1xE5Ya-0008c2-1y; Tue, 06 Oct 2026 15:50:13 +0200 From: Alexander Stein To: Frank Li Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Markus Niebel , linux@ew.tq-group.com, devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/3] arm64: dts: imx8mn-tqma8mqnl: restrict clock for SPI-NOR flash Date: Tue, 06 Oct 2026 15:50:12 +0200 Message-ID: <5021357.mvXUDI8C0e@steina-w> Organization: TQ-Systems GmbH In-Reply-To: References: <20261006132512.2246196-1-alexander.stein@ew.tq-group.com> <20261006132512.2246196-2-alexander.stein@ew.tq-group.com> 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" X-Virus-Scanned: Clear (ClamAV 1.4.3/28145/Tue Oct 6 08:26:12 2026) Am Dienstag, 6. Oktober 2026, 15:46:50 Mitteleurop=C3=A4ische Sommerzeit sc= hrieb Frank Li: > On Tue, Oct 06, 2026 at 03:25:10PM +0200, Alexander Stein wrote: > > From: Markus Niebel > > > > The FlexSPI controller uses quad SPI with internal clock recovery. > > The clock is therefore restricted to 66.666666 MHz according to > > data sheet. >=20 > Which datasheet? I suppose NOR flash datasheet, can you provide link > here. The i.MX8M Nano data sheet Rev 5 09/2022 section 3.9.1.1 "SDR mode with =46lexSPIn_MCR0[RXCLKSRC] =3D 0x0, 0x1, 0x2" Table 55. "FlexSPI input timing in SDR mode where FlexSPIn_MCR0[RXCLKSRC] =3D 0x0" lists 66 Mhz maximum for "Frequency of operation". Best regards Alexander > Frank >=20 > > > > Signed-off-by: Markus Niebel > > Signed-off-by: Alexander Stein > > --- > > arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi b/arch= /arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi > > index 48a687926aa1b..c88d83243097f 100644 > > --- a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi > > +++ b/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi > > @@ -63,7 +63,7 @@ &flexspi { > > flash0: flash@0 { > > compatible =3D "jedec,spi-nor"; > > reg =3D <0>; > > - spi-max-frequency =3D <84000000>; > > + spi-max-frequency =3D <66666666>; > > spi-tx-bus-width =3D <1>; > > spi-rx-bus-width =3D <4>; > > vcc-supply =3D <&buck5_reg>; > > -- > > 2.55.0 > > > > >=20 =2D-=20 TQ-Systems GmbH | M=C3=BChlstra=C3=9Fe 2, Gut Delling | 82229 Seefeld, Germ= any Amtsgericht M=C3=BCnchen, HRB 105018 Gesch=C3=A4ftsf=C3=BChrer: Detlef Schneider, R=C3=BCdiger Stahl, Stefan Sch= neider http://www.tq-group.com/