linux-kernel - [PATCH 0/2] tlv320adc3xxx: Allow MICBIAS pins to be used as GPOs

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Date: Wed, 29 May 2024 18:33:43 +0200
From: Ricard Wanderlof <ricard.wanderlof@...s.com>
To: Mark Brown <broonie@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
	Shenghao Ding <shenghao-ding@...com>, Kevin Lu <kevin-lu@...com>, Baojun Xu
	<baojun.xu@...com>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
	<krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Ricard Wanderlof
	<ricardw@...s.com>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai
	<tiwai@...e.com>
CC: <alsa-devel@...a-project.org>, <linux-sound@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "Ricard
 Wanderlof" <ricard.wanderlof@...s.com>, <kernel@...s.com>
Subject: [PATCH 0/2] tlv320adc3xxx: Allow MICBIAS pins to be used as GPOs

In some cases, depending on system design, the MICBIAS pins on the
chip are not needed as such, but a couple of extra GPIO pins would be
useful. This patch allows the MICBIAS pins to be configured in the
device tree as general purpose output pins, controlled via the GPIO
framework.

Owing to their originally intended purpose there are some limitations:
when the MICBIAS pins are deactivated, they will float, so will likely
need a pulldown in many applications. When activated, they will
assume the voltage specified by the micbias1-vg and micbias2-vg
properties, respectively, meaning that the resulting output voltage
will be 2.0 V, 2.5 V or AVDD .

Signed-off-by: Ricard Wanderlof <ricard.wanderlof@...s.com>
---
Ricard Wanderlof (2):
      ASoC: dt-bindings: tlv320adc3xxx: Add MICBIAS-as-GPO properties
      tlv320adc3xxx: Add support for using MICBIAS pins as GPO

 .../bindings/sound/ti,tlv320adc3xxx.yaml           |  20 ++++
 sound/soc/codecs/tlv320adc3xxx.c                   | 105 ++++++++++++++++-----
 2 files changed, 104 insertions(+), 21 deletions(-)
---
base-commit: 47d09270d7776e46858a161f94b735640b2fb056
change-id: 20240528-tlv320adc3xxx-micbias-gpo-b8b4d1c846d3

Best regards,
-- 
-- 
Ricard Wolf Wanderlof                           ricardw(at)axis.com
Axis Communications AB, Lund, Sweden            www.axis.com
Phone +46 46 272 2016                           Fax +46 46 13 61 30