Re: [PATCH] arm64: dts: freescale: imx8mp-tqma8mpql-mba8mp-ras314: fix UART1 RTS/CTS muxing

[Nora Schiffer <nora.schiffer@ew.tq-group.com>]

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.
> > 
> > This switches the RTS and CTS pins, which is fine for this board, as
> > UART1 is routed to a pin header.
> 
> Is below commit better?
> 
> UART1 operates in DCE mode, but the RTS/CTS pins were incorrectly
> configured using the DTE pinmux setting.
> 
> 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



> 
> Frank
> > 
> > Fixes: ddabb3ce3f90 ("arm64: dts: freescale: add TQMa8MPQL on MBa8MP-RAS314")
> > Signed-off-by: Nora Schiffer <nora.schiffer@ew.tq-group.com>
> > ---
> >  .../boot/dts/freescale/imx8mp-tqma8mpql-mba8mp-ras314.dts     | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mp-ras314.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 = <MX8MP_IOMUXC_SAI2_RXFS__UART1_DCE_TX	0x14>,
> >  			   <MX8MP_IOMUXC_SAI2_RXC__UART1_DCE_RX		0x14>,
> > -			   <MX8MP_IOMUXC_SAI2_RXD0__UART1_DTE_CTS	0x14>,
> > -			   <MX8MP_IOMUXC_SAI2_TXFS__UART1_DTE_RTS	0x14>;
> > +			   <MX8MP_IOMUXC_SAI2_RXD0__UART1_DCE_RTS	0x14>,
> > +			   <MX8MP_IOMUXC_SAI2_TXFS__UART1_DCE_CTS	0x14>;
> >  	};
> > 
> >  	pinctrl_uart1_gpio: uart1gpiogrp {
> > --
> > TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
> > Amtsgericht München, HRB 105018
> > Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
> > https://www.tq-group.com/
> > 

-- 
TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
Amtsgericht München, HRB 105018
Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
https://www.tq-group.com/