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: <aXHlfIDSgFqiUuiF@shlinux89>
Date: Thu, 22 Jan 2026 16:53:16 +0800
From: Peng Fan <peng.fan@....nxp.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: Peng Fan <peng.fan@....com>