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Thu, 26 Feb 2026 09:52:23 +0100 (CET) Message-ID: Subject: Re: [PATCH] arm64: dts: freescale: imx8mp-tqma8mpql-mba8mp-ras314: fix UART1 RTS/CTS muxing From: Nora Schiffer To: Frank Li Cc: Sascha Hauer , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Pengutronix Kernel Team , Fabio Estevam , linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, linux@ew.tq-group.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 26 Feb 2026 09:52:22 +0100 In-Reply-To: References: <20260225083419.5639-1-nora.schiffer@ew.tq-group.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-cloud-security-sender:nora.schiffer@ew.tq-group.com X-cloud-security-recipient:linux-kernel@vger.kernel.org X-cloud-security-crypt: load encryption module X-cloud-security-Mailarchiv: E-Mail archived for: nora.schiffer@ew.tq-group.com X-cloud-security-Mailarchivtype:outbound X-cloud-security-Virusscan:CLEAN X-cloud-security-disclaimer: This E-Mail was scanned by E-Mailservice on mx-relay60-hz1.antispameurope.com with 4fM4w80B2Yz28yMP X-cloud-security-connect: he-nlb01-hz1.hornetsecurity.com[94.100.132.6], TLS=1, IP=94.100.132.6 X-cloud-security-Digest:daeffe5ef58851175bcfb2fcf892fa20 X-cloud-security:scantime:1.389 DKIM-Signature: a=rsa-sha256; bh=pZA7AsIzdwCY7ab6l8jLMqVVu0K3dmUt9FW8oclhVyw=; c=relaxed/relaxed; d=ew.tq-group.com; h=content-type:mime-version:subject:from:to:message-id:date; s=hse1; t=1772095954; v=1; b=dy116KkDEXhhyzMhCoifVkCDtS+cxvkjAGTeSTMnQrQwo22T9wHlAdbHc80ekMk4mFGoBwaD uyhC5X+qmEXkj/G9C1mq+utjTzi5cFZZoXLnrPgkopYbHyhcmrwgpNUWQ/cXm2WhHVrwMdbzYTy pMn+LxyWHq0LBf2HJ6qliMCnkxIj+SkumgvMun3VnK3A98kdhjQGO5f7z9IaE7OZfuqqPOYbHpu SciTFa0rn7mplyHWpYfYBc8BkKm9cPhgf/Xhd6cxAxeY4QX9VmhwIUdkF7ckhEScB0wsLbBX3Fa PIpDy3spd6kT5CcAGNr+0JJyAxSnFXCK5V8+C5L4qekTg== On Wed, 2026-02-25 at 10:41 -0500, Frank Li wrote: > On Wed, Feb 25, 2026 at 09:34:18AM +0100, Nora Schiffer wrote: > > The pinmuxing for UART1 was mixing DCE and DTE modes, which cannot work= . > > Consistently use DCE mode. > >=20 > > This switches the RTS and CTS pins, which is fine for this board, as > > UART1 is routed to a pin header. >=20 > Is below commit better? >=20 > UART1 operates in DCE mode, but the RTS/CTS pins were incorrectly > configured using the DTE pinmux setting. >=20 > Correct the pinmux to match DCE mode, which does not affect existing > functionality because UART1 signals are routed to a pin header. Hi Frank, your commit message sounds better, do you want me to send a v2? Best, Nora >=20 > Frank > >=20 > > Fixes: ddabb3ce3f90 ("arm64: dts: freescale: add TQMa8MPQL on MBa8MP-RA= S314") > > Signed-off-by: Nora Schiffer > > --- > > .../boot/dts/freescale/imx8mp-tqma8mpql-mba8mp-ras314.dts | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > >=20 > > diff --git a/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mp-ras3= 14.dts b/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mp-ras314.dts > > index b7f69c92b7748..1665a5030b993 100644 > > --- a/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mp-ras314.dts > > +++ b/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mp-ras314.dts > > @@ -848,8 +848,8 @@ pinctrl_tlv320aic3x04: tlv320aic3x04grp { > > pinctrl_uart1: uart1grp { > > fsl,pins =3D , > > , > > - , > > - ; > > + , > > + ; > > }; > >=20 > > pinctrl_uart1_gpio: uart1gpiogrp { > > -- > > TQ-Systems GmbH | M=C3=BChlstra=C3=9Fe 2, Gut Delling | 82229 Seefeld, = Germany > > Amtsgericht M=C3=BCnchen, HRB 105018 > > Gesch=C3=A4ftsf=C3=BChrer: Detlef Schneider, R=C3=BCdiger Stahl, Stefan= Schneider > > https://www.tq-group.com/ > >=20 --=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 https://www.tq-group.com/