From nobody Fri Dec 19 17:18:14 2025 Received: from smtpout-02.galae.net (smtpout-02.galae.net [185.246.84.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 19A3133EAE4; Thu, 6 Nov 2025 14:12:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.84.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762438324; cv=none; b=kvmjbFGz+TEmVMqpo4ztpdWsFdC1QmvuW8akms6noZez1PqRtMJOxhv4xnlRysHzQm1TlzWZ5UIGXNnmCZtv1Ow2GTubkoA7rimqGS44mQpOspNwYJ9UNJ1XYtgpdy3LjKzfnTm9Mh8BrLawa/2Kx4OlsZ2PxZK2XvRIFw+EOe0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762438324; c=relaxed/simple; bh=FpxVQB1INbV+80OzoaW6i4u58HK/pggkqM01al2Kpa4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=lVcZ3QV1L+ipj2OH5PXY795OTVTP4xNzJud0g8yqb/WIsKbebf7Zh62wqmf4tc66Cq46CvJAKw3Pgi3AtbZUEvDN9B4V2Tc80oWOhNx4BhXITV7S2TSrt62DXjlbap/Gji5MJWEa64DzPfs2vSPR+7eb7HpUcusggaMTXQ2GV7A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=dt7rl4Fk; arc=none smtp.client-ip=185.246.84.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="dt7rl4Fk" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id 72F261A18F2; Thu, 6 Nov 2025 14:12:00 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 476596068C; Thu, 6 Nov 2025 14:12:00 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 244C911851155; Thu, 6 Nov 2025 15:11:58 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1762438319; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=BHpWHfNsMm/O8uvLkpHCGYuFYP58PxmK8ahqwS8SU9M=; b=dt7rl4Fk419ka+j4AXX9FMZqTqMU3K2cmZos153TfZQZY6snNfBZsh0TI5VILosd98ZCio WiacUqgVCXvePcc7z3Wsjv4R2W9UMAy5pyApK1njA2jk2O3v8BH7BmX6W2/TRYb6CdN9oy P1pI/G8iCjvKqa9+sZmO7lYN0yhr0XP6NqzlAqAq04CG8snqFX3fTBnGExDOgVOCelxwYY 30WxBuw1FXJaDzUCTleR/UzFPLTzzk8WdeGbINchTQzcmYZmX8fH57I07adi9XpuQdrx3f 5qR3eHJU3+1WfpJMA3+fI3L1YeTnAjbLM+izJdh+nQEn8L1O4F2lxDeNu908IA== From: Romain Gantois Date: Thu, 06 Nov 2025 15:11:49 +0100 Subject: [PATCH v3 4/5] regulator: Support the LTM8054 voltage regulator Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251106-ltm8054-driver-v3-4-fd1feae0f65a@bootlin.com> References: <20251106-ltm8054-driver-v3-0-fd1feae0f65a@bootlin.com> In-Reply-To: <20251106-ltm8054-driver-v3-0-fd1feae0f65a@bootlin.com> To: Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko Cc: Hans de Goede , Thomas Petazzoni , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, Romain Gantois X-Mailer: b4 0.14.3 X-Last-TLS-Session-Version: TLSv1.3 Add a stub driver for the Linear Technology LTM8054 Buck-Boost voltage regulator. This version only supports enabling/disabling the regulator via a GPIO, and reporting the output voltage level from the resistor divider values given in the device tree. Signed-off-by: Romain Gantois Reviewed-by: Andy Shevchenko --- MAINTAINERS | 1 + drivers/regulator/Kconfig | 8 +++ drivers/regulator/Makefile | 1 + drivers/regulator/ltm8054-regulator.c | 125 ++++++++++++++++++++++++++++++= ++++ 4 files changed, 135 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 96552be2fcdd..45906509508d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14789,6 +14789,7 @@ LTM8054 REGULATOR DRIVER M: Romain Gantois S: Maintained F: Documentation/devicetree/bindings/regulator/adi,ltm8054.yaml +F: drivers/regulator/ltm8054-regulator.c =20 LTP (Linux Test Project) M: Andrea Cervesato diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 403890a76070..f5c6d4a21a88 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -585,6 +585,14 @@ config REGULATOR_LTC3676 This enables support for the LTC3676 8-output regulators controlled via I2C. =20 +config REGULATOR_LTM8054 + tristate "LTM8054 Buck-Boost voltage regulator" + help + This driver provides support for the Analog Devices LTM8054 + Buck-Boost micromodule regulator. The LTM8054 has an adjustable + output current limitation and a feedback pin for setting the + output voltage level. + config REGULATOR_MAX14577 tristate "Maxim 14577/77836 regulator" depends on MFD_MAX14577 diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index b3101376029d..f2687755c291 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -71,6 +71,7 @@ obj-$(CONFIG_REGULATOR_LP8788) +=3D lp8788-ldo.o obj-$(CONFIG_REGULATOR_LP8755) +=3D lp8755.o obj-$(CONFIG_REGULATOR_LTC3589) +=3D ltc3589.o obj-$(CONFIG_REGULATOR_LTC3676) +=3D ltc3676.o +obj-$(CONFIG_REGULATOR_LTM8054) +=3D ltm8054-regulator.o obj-$(CONFIG_REGULATOR_MAX14577) +=3D max14577-regulator.o obj-$(CONFIG_REGULATOR_MAX1586) +=3D max1586.o obj-$(CONFIG_REGULATOR_MAX5970) +=3D max5970-regulator.o diff --git a/drivers/regulator/ltm8054-regulator.c b/drivers/regulator/ltm8= 054-regulator.c new file mode 100644 index 000000000000..b5783f6629e3 --- /dev/null +++ b/drivers/regulator/ltm8054-regulator.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Analog Devices LTM8054 Buck-Boost regulator driver + * + * Copyright (C) 2025 Bootlin + */ + +#include +#include +#include +#include +#include +#include + +#include + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +/* The LTM8054 regulates its FB pin to 1.2V */ +#define LTM8054_FB_uV 1200000 + +struct ltm8054_priv { + struct regulator_desc rdesc; +}; + +static int ltm8054_scale(unsigned int uV, u32 r1, u32 r2) +{ + u64 tmp; + + tmp =3D (u64)uV * r1; + do_div(tmp, r2); + + return uV + tmp; +} + +static const struct regulator_ops ltm8054_regulator_ops =3D { }; + +static int ltm8054_of_parse(struct device *dev, struct ltm8054_priv *priv, + struct regulator_config *config) +{ + u32 r[2]; + int ret; + + ret =3D device_property_read_u32_array(dev, "regulator-fb-voltage-divider= -ohms", + r, ARRAY_SIZE(r)); + if (ret) + return ret; + + priv->rdesc.fixed_uV =3D ltm8054_scale(LTM8054_FB_uV, r[0], r[1]); + priv->rdesc.min_uV =3D priv->rdesc.fixed_uV; + priv->rdesc.n_voltages =3D 1; + + config->of_node =3D dev_of_node(dev); + config->init_data =3D of_get_regulator_init_data(dev, + config->of_node, + &priv->rdesc); + if (!config->init_data) + return -EINVAL; + + config->ena_gpiod =3D devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LO= W); + if (IS_ERR(config->ena_gpiod)) + return PTR_ERR(config->ena_gpiod); + + return 0; +} + +static int ltm8054_probe(struct platform_device *pdev) +{ + struct regulator_config config =3D { }; + struct device *dev =3D &pdev->dev; + struct regulator_dev *rdev; + struct ltm8054_priv *priv; + int ret; + + priv =3D devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->rdesc.name =3D "ltm8054-regulator"; + priv->rdesc.ops =3D <m8054_regulator_ops; + priv->rdesc.type =3D REGULATOR_VOLTAGE; + priv->rdesc.owner =3D THIS_MODULE; + + config.dev =3D dev; + config.driver_data =3D priv; + + ret =3D ltm8054_of_parse(dev, priv, &config); + if (ret) + return dev_err_probe(dev, ret, "failed to parse device tree\n"); + + rdev =3D devm_regulator_register(dev, &priv->rdesc, &config); + if (IS_ERR(rdev)) + return dev_err_probe(dev, PTR_ERR(rdev), "failed to register regulator\n= "); + + return 0; +} + +static const struct of_device_id ltm8054_of_match[] =3D { + { .compatible =3D "adi,ltm8054" }, + {} +}; +MODULE_DEVICE_TABLE(of, ltm8054_of_match); + +static struct platform_driver ltm8054_driver =3D { + .probe =3D ltm8054_probe, + .driver =3D { + .name =3D "ltm8054", + .of_match_table =3D ltm8054_of_match, + }, +}; +module_platform_driver(ltm8054_driver); + +MODULE_DESCRIPTION("LTM8054 regulator driver"); +MODULE_AUTHOR("Romain Gantois "); +MODULE_LICENSE("GPL"); --=20 2.51.2