From nobody Thu Oct 2 14:24:23 2025 Received: from smtpout-03.galae.net (smtpout-03.galae.net [185.246.85.4]) (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 5CCE93054D0 for ; Tue, 16 Sep 2025 10:24:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.85.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758018264; cv=none; b=o6Kf6cqbykM53lXRj/kQbG/7D/CAwi4XCl1PL6I7EJcvMMXSJbLIe8EL8JKFpo2OpIuJKq9qz9MOIeU7/nDWepC8Ehz5amuqOEjIcmIqTho+wSjcCIAwGymhoGO3ui3Nz+qD7onUjkoMZQRMC7AJVbowx+DNjH6QDe8kEv+RFFk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758018264; c=relaxed/simple; bh=vC6bak3vajHp/KdZeZhz8m7Ms2hMvoLFBwxuzDF7oJI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=q11TJ+GySVFxBNFthChkit0UbWdV1FnGc9RAaKgkk03LuJrlhsnAamXBdNo8HbIpWHfIHYxCp3rOqhDyR1GIsq3ILVuZnHlftYID4PAcfjGUZBipLb8uvBH8TKx2RJDIuGGNFidmgZ4SorCNiP70BWOOdaU1Br7cHa4qfaViSck= 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=0WpEc2FM; arc=none smtp.client-ip=185.246.85.4 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="0WpEc2FM" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id 075884E40BB5; Tue, 16 Sep 2025 10:24:21 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id D132F6061E; Tue, 16 Sep 2025 10:24:20 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 082BA102F16D4; Tue, 16 Sep 2025 12:24:17 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1758018259; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=odLlbEbxIjN2irzHQdkofES+um0xswwNXAgaifLMN0M=; b=0WpEc2FMItr0WO4B17EGk9jPpbGZnPISnz+SSyYUsRY+e/jLbibtu+PeRMqIZgDuoq+W0/ 4qoY0m1CWU+2CLNT78XdXz1/c9YC8/IccoKZDXj6NcPOHQ8V8VTFd1ynLpkC/k1/N0A0lr LvegIVF973yvQx4OGv51W0lb3cBe92i7oUfgslzGR6lKjmWIBdk0XwmGGyRBUXCw9zoDz0 lAF4zUoLWvoWVKtNYh1/jvbHoXDfYptSjfhP1m5jEcWkIoiRSfQcIg/kkmx/IgOi4fYj+R F/1LxPTChO4hSoBv1Y8JyhLQ8GiyY56lGQhSRqnVo154l+tIq4O4ioTTpCMqIQ== From: Romain Gantois Date: Tue, 16 Sep 2025 12:24:08 +0200 Subject: [PATCH 3/4] 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: <20250916-ltm8054-driver-v1-3-fd4e781d33b9@bootlin.com> References: <20250916-ltm8054-driver-v1-0-fd4e781d33b9@bootlin.com> In-Reply-To: <20250916-ltm8054-driver-v1-0-fd4e781d33b9@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: Thomas Petazzoni , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, Romain Gantois X-Mailer: b4 0.14.2 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 --- MAINTAINERS | 1 + drivers/regulator/Kconfig | 8 +++ drivers/regulator/Makefile | 1 + drivers/regulator/ltm8054-regulator.c | 120 ++++++++++++++++++++++++++++++= ++++ 4 files changed, 130 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 7160179e6bf9d45a241582c1b6df8c0ebf6c3641..4bc1a0e4c087060295a927da02f= 56c332269035f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14521,6 +14521,7 @@ LTM8054 REGULATOR DRIVER M: Romain Gantois S: Maintained F: Documentation/devicetree/bindings/regulator/lltc,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 eaa6df1c9f806652a21942bcb48084ba63f942d9..15fb71193b67d0b2daa631b6977= 8dde9323aedd2 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -577,6 +577,14 @@ 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 Linear Technology 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 be98b29d6675d8be1ca984c2d137bdfc4ba2de87..0e61ef826c08f64ea638d19bf10= e69abf1526aa7 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -70,6 +70,7 @@ 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 0000000000000000000000000000000000000000..e41bd95da55fb87912e2cdf70ba= e231133c25745 --- /dev/null +++ b/drivers/regulator/ltm8054-regulator.c @@ -0,0 +1,120 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Linear Technology LTM8054 Buck-Boost regulator driver + * + * Copyright (C) 2025 Bootlin + */ + +#include +#include +#include +#include +#include +#include +#include + +/* The LTM8054 regulates its FB pin to 1.2V */ +#define LTM8054_FB_V 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 + (unsigned int)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) +{ + struct device_node *np =3D dev->of_node; + u32 r[2]; + int ret; + + config->of_node =3D np; + + ret =3D of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2); + if (ret) { + dev_err(dev, "Failed to parse voltage divider\n"); + return ret; + } + + priv->rdesc.fixed_uV =3D ltm8054_scale(LTM8054_FB_V, r[0], r[1]); + priv->rdesc.min_uV =3D priv->rdesc.fixed_uV; + priv->rdesc.n_voltages =3D 1; + + config->init_data =3D of_get_regulator_init_data(dev, + np, + &priv->rdesc); + if (!config->init_data) { + dev_err(dev, "failed to parse init data\n"); + return -EINVAL; + } + + config->ena_gpiod =3D devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LO= W); + if (IS_ERR(config->ena_gpiod)) { + dev_err(dev, "unable to acquire enable gpio\n"); + return PTR_ERR(config->ena_gpiod); + } + + return 0; +} + +static int ltm8054_probe(struct platform_device *pdev) +{ + struct regulator_config config =3D { 0 }; + struct regulator_dev *rdev; + struct ltm8054_priv *priv; + int ret; + + priv =3D devm_kzalloc(&pdev->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 &pdev->dev; + config.driver_data =3D priv; + + ret =3D ltm8054_of_parse(&pdev->dev, priv, &config); + if (ret) + return dev_err_probe(&pdev->dev, ret, "failed to parse device tree\n"); + + rdev =3D devm_regulator_register(&pdev->dev, &priv->rdesc, &config); + if (IS_ERR(rdev)) + return dev_err_probe(&pdev->dev, PTR_ERR(rdev), "failed to register regu= lator\n"); + + return 0; +} + +static const struct of_device_id __maybe_unused ltm8054_of_match[] =3D { + { .compatible =3D "lltc,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 of_match_ptr(ltm8054_of_match), + }, +}; + +module_platform_driver(ltm8054_driver); + +MODULE_DESCRIPTION("LTM8054 regulator driver"); +MODULE_AUTHOR("Romain Gantois "); +MODULE_LICENSE("GPL"); --=20 2.51.0