linux-kernel - Re: [PATCH V2] arm64: dts: imx93-evk/qsb: add m2-pcm-level-shifter-hog to enable BT HFP

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Message-ID: <aXI1xgnkarGS0Min@lizhi-Precision-Tower-5810>
Date: Thu, 22 Jan 2026 09:35:50 -0500
From: Frank Li <Frank.li@....com>
To: Sherry Sun <sherry.sun@....com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
	kernel@...gutronix.de, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] arm64: dts: imx93-evk/qsb: add
 m2-pcm-level-shifter-hog to enable BT HFP

On Wed, Jan 21, 2026 at 07:13:46PM +0800, Sherry Sun wrote:
> For i.MX93 11x11 EVK and 9x9 QSB boards, add the gpio-hog to enable the
> M.2 PCM pins level shifter connected between soc sai1 interface and M.2
> PCM pins so that HFP feature can be supported.
>
> Since the HFP is only used at a later stage — after the BT firmware has
> been downloaded and the BT connection with the remote device has been
> established — both the pcal6524 expander and sai1 interface are already
> fully initialized and available by that time. Therefore, using a
> gpio-hog here will not introduce any probe ordering or dependency issues
> for the HFP use case.
>
> Signed-off-by: Sherry Sun <sherry.sun@....com>
> ---

Reviewed-by: Frank Li <Frank.Li@....com>

> Changes in V2:
> 1. Improve the commit message to avoid confusion.
> ---
>  arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts | 6 ++++++
>  arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts   | 6 ++++++
>  2 files changed, 12 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts b/arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts
> index 8dd5340e8141..acb160d3186c 100644
> --- a/arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts
> @@ -356,6 +356,12 @@ pcal6524: gpio@22 {
>  		#interrupt-cells = <2>;
>  		interrupt-parent = <&gpio3>;
>  		interrupts = <27 IRQ_TYPE_LEVEL_LOW>;
> +
> +		m2-pcm-level-shifter-hog {
> +			gpio-hog;
> +			gpios = <19 GPIO_ACTIVE_HIGH>;
> +			output-high;
> +		};
>  	};
>
>  	pmic@25 {
> diff --git a/arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts b/arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts
> index 0852067eab2c..11e08673083b 100644
> --- a/arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts
> +++ b/arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts
> @@ -349,6 +349,12 @@ mic-can-sel-hog {
>  			gpios = <17 GPIO_ACTIVE_HIGH>;
>  			output-low;
>  		};
> +
> +		m2-pcm-level-shifter-hog {
> +			gpio-hog;
> +			gpios = <19 GPIO_ACTIVE_HIGH>;
> +			output-high;
> +		};
>  	};
>
>  	pmic@25 {
> --
> 2.37.1
>