From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) (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 068AF4B8DE6; Fri, 21 Aug 2026 14:08:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.135.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787321329; cv=none; b=fO9CmqyC6HBekxEKsEn6U28eKpimnfSn6JaIu4E1y19koMbgx+qXvhP+9X9m+y36yG3AfOJTz/rA6r9JLShT6GCOAnx/EI+TLO/gPknC+UzXXAydIIbDHxQNlsyWqnTblOQbSGRb5ZbBAKDgJyLYunJ7a+aozlvGW47Bemh01K8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787321329; c=relaxed/simple; bh=AifmB2G01YuHbrZ/VCISIzsFDixJ2lc7TLl+pAbOcZg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:References: In-Reply-To:To:CC; b=cpwEtsJ/EP/mFII9aLocrHfYT/2/3IGBrLNa/J0Hxx7xZ+ffvcHhOUGFzN2KSCqgThwyhrxKbwI5k9E7vQ5WFBrDTUttck0UNSTqNfKVVYY27e/lroP2Odd8gd8cJ4+qG2clN2BZB2GBSapqO1WwmmI4v4QnlXBe5/DQN15atG0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=analog.com; spf=pass smtp.mailfrom=analog.com; dkim=pass (2048-bit key) header.d=analog.com header.i=@analog.com header.b=wVQ4ubv2; arc=none smtp.client-ip=148.163.135.77 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=analog.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=analog.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=analog.com header.i=@analog.com header.b="wVQ4ubv2" Received: from pps.filterd (m0167088.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 67LCpIwT3677118; Fri, 21 Aug 2026 10:08:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=analog.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=DKIM; bh=ctXKK SqdYp1H827suGBvnUi0zcup9pqq/XGe2hYuRpM=; b=wVQ4ubv2EoKYl3daoPoiX Mz5wX/q3ZVvWyePzklT6hnr1WzAZS5QgTO6EpM7vPUigA3yw+bvBSoiU6toX3oXV C1ZwImwJTmOm5qdAK7tNrXi5WwZJ9pTDAl+aYdsHG3WejzJkIUi9WesKyPS5OjY8 QT6L2BMdVvVEBwj4s5rXhvyIrgagWgTYNhkTiOL9rbQjLpCQ87GCn9jMPv8GDmdn 4PNEiXkcHBB5+TCY2rdg38oDhYC7v98jNTibIhMGSd/+AHOFdd9cjMx53yfBPf0X YxRz2KLt+1UR35io0Dpr2QShDG6nwVaIecin8QW66iVvTr/HM9lgaaL/2gEIB5vs g== Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com (PPS) with ESMTPS id 4g6a27k40b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 21 Aug 2026 10:08:36 -0400 (EDT) Received: from ASHBMBX8.ad.analog.com (ASHBMBX8.ad.analog.com [10.64.17.5]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 67LE8Zpc033049 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 21 Aug 2026 10:08:35 -0400 Received: from ASHBCASHYB4.ad.analog.com (10.64.17.132) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1748.37; Fri, 21 Aug 2026 10:08:35 -0400 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBCASHYB4.ad.analog.com (10.64.17.132) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1748.37; Fri, 21 Aug 2026 10:08:35 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server id 15.2.1748.37 via Frontend Transport; Fri, 21 Aug 2026 10:08:34 -0400 Received: from HYB-e1y2fvUQ3cx.ad.analog.com ([10.32.223.174]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 67LE7Kks024319; Fri, 21 Aug 2026 10:08:25 -0400 From: Janani Sunil Date: Fri, 21 Aug 2026 16:07:02 +0200 Subject: [PATCH v4 09/14] iio: adc: ad7768: Add VCM regulator support Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20260821-ad7768-driver-v4-9-bb8fbd06d4eb@analog.com> References: <20260821-ad7768-driver-v4-0-bb8fbd06d4eb@analog.com> In-Reply-To: <20260821-ad7768-driver-v4-0-bb8fbd06d4eb@analog.com> To: =?utf-8?q?Nuno_S=C3=A1?= , Michael Hennerich , Jonathan Cameron , "David Lechner" , Andy Shevchenko , "Rob Herring" , Krzysztof Kozlowski , "Conor Dooley" , Olivier Moysan , Philipp Zabel , Linus Walleij , Bartosz Golaszewski , Jonathan Corbet , Shuah Khan , Michael Walle CC: , , , , , , , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Janani Sunil X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787321240; l=6931; i=janani.sunil@analog.com; s=20260507; h=from:subject:message-id; bh=AifmB2G01YuHbrZ/VCISIzsFDixJ2lc7TLl+pAbOcZg=; b=u+mbP8eWUt2pTq935o0TWuE/srFLQg/+bvjlvqrmDfkDLEl31GuqMiEwEd8qlhqe38av+sEyR IV0DCq3dVk4D+yTcBwcMEa8Iq+vRTUfojpKgY9MFtQbs8MgBVjupZOp X-Developer-Key: i=janani.sunil@analog.com; a=ed25519; pk=e25MyjRLPY3RWrYm/LrJ+/+t1MZJUbkgIW5CZg+g+hA= X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-ORIG-GUID: nbn87fw-9abNDJ_buyTBBzCjJUDQm4bF X-Proofpoint-Spam-Info: AW1haW4tMjYwODIxMDEwOSBTYWx0ZWRfXyMIqSwP+6y++ 1Hi9akI8Q/iRNnjhav6sX18Z8RyCNT+2HM6ccV8dTM7F4S5cMoZVSWQcRC8zJmP8QQf+Rn2ZH2D Xfzso8SeSVoUs4rNU1A7xb/osGZaz4IgmvfLDApkDNHxDCIwRJQo X-Authority-Analysis: v=2.4 cv=FeoHAp+6 c=1 sm=1 tr=0 ts=6a885be4 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=uXIjobp8t2wMuQ0fPvqm:22 a=gAnH3GRIAAAA:8 a=-yOam_tWmGQwaYRI1VcA:9 a=QEXdDO2ut3YA:10 a=br55WurUj89AL1qEz8Q6:22 X-Proofpoint-GUID: nbn87fw-9abNDJ_buyTBBzCjJUDQm4bF X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODIxMDEwOSBTYWx0ZWRfX/dUnDKVoNozi WIOBP2ukzWDQ4jbvpwcjiNo3KTbQUSc8XjbhMLotrVK8QVmMZ19RICF8TXkij3S1DZo+NUt3B2i SvmBQ+omC24hZrotXu9y2A4mbzZLzUx1edThcmgCCOBtkIb79HPzeXUc/kB+x6sDlQ9rMfcVIoR OBODKbKeu9Eqi+jMhljHwzIIOhnNLz2IFAsjY+hZ23CpHP3NDcOQZVD3Luj9bxBKgueeirC0ot6 5xyCocPnqlUbjz3UlqSFZN0xefZVnqJWvEp9zuiza6d0R+EeBAUhljrjjn6xT3YHPrTB2L+jbwn KpSdUnujb/icfCj3wWLeaGMw3N6x9KRNl0Kwq2N6qG44ILiU+R1PEqlHd5DuoYMfBUwyY/GyiYt 3hnSEoWGop3Vb7VK0q2dNzgP5dqyUPxD+ihZ+wUlJ8N+3VAwxVqVZFSgKJcAeCRDW/q0UQrbQWo qB/k+iHtOxLhxi/HlQw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-21_04,2026-08-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 adultscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 priorityscore=1501 bulkscore=0 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608210109 Expose the on-chip common mode voltage output through the regulator framework. Support the three fixed output levels and the supply-dependent AVDD1/2 setting. Keep the ADC runtime active while VCM is enabled and release the runtime PM reference when the output is disabled. Signed-off-by: Janani Sunil --- drivers/iio/adc/Kconfig | 2 +- drivers/iio/adc/ad7768.c | 161 ++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 160 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 48bb108382b5..a16f36f9502c 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -432,7 +432,7 @@ config AD7766 config AD7768 tristate "Analog Devices AD7768/AD7768-4 ADC driver" depends on SPI - depends on REGULATOR || COMPILE_TEST + select REGULATOR select IIO_BUFFER select IIO_BACKEND select REGMAP diff --git a/drivers/iio/adc/ad7768.c b/drivers/iio/adc/ad7768.c index 12370139d03f..97f84a6da63e 100644 --- a/drivers/iio/adc/ad7768.c +++ b/drivers/iio/adc/ad7768.c @@ -18,10 +18,12 @@ #include #include #include +#include #include #include #include #include +#include #include #include #include @@ -53,6 +55,8 @@ #define AD7768_POWER_MODE_MCLK_DIV_MSK GENMASK(1, 0) #define AD7768_REG_GENERAL_CONFIG 0x05 +#define AD7768_GEN_CONFIG_VCM_SEL_MSK GENMASK(1, 0) +#define AD7768_GEN_CONFIG_VCM_PD BIT(4) #define AD7768_REG_DATA_CONTROL 0x06 #define AD7768_DATA_CONTROL_SPI_RESET_1 0x03 @@ -197,10 +201,156 @@ struct ad7768_state { u64 ch_convdelay_ps[AD7768_MAX_CHANNEL]; enum ad7768_filter_type ch_filter[AD7768_MAX_CHANNEL]; struct iio_backend *back; + struct regulator_dev *vcm_rdev; + unsigned int avdd1_uV; __be16 d16 __aligned(IIO_DMA_MINALIGN); }; +static const unsigned int ad7768_vcm_voltage_table[] = { + 0, 1650000, 2500000, 2140000, +}; + +static int ad7768_vcm_list_voltage(struct regulator_dev *rdev, + unsigned int selector) +{ + struct ad7768_state *st = rdev_get_drvdata(rdev); + + if (selector >= ARRAY_SIZE(ad7768_vcm_voltage_table)) + return -EINVAL; + + if (!selector) + return DIV_ROUND_CLOSEST(st->avdd1_uV, 2); + + return ad7768_vcm_voltage_table[selector]; +} + +static int ad7768_vcm_enable(struct regulator_dev *rdev) +{ + struct ad7768_state *st = rdev_get_drvdata(rdev); + int ret; + + ret = pm_runtime_resume_and_get(regmap_get_device(st->regmap)); + if (ret < 0) + return ret; + + ret = regmap_clear_bits(st->regmap, AD7768_REG_GENERAL_CONFIG, + AD7768_GEN_CONFIG_VCM_PD); + if (ret) + pm_runtime_put_autosuspend(regmap_get_device(st->regmap)); + + return ret; +} + +static int ad7768_vcm_disable(struct regulator_dev *rdev) +{ + struct ad7768_state *st = rdev_get_drvdata(rdev); + int ret; + + ret = regmap_set_bits(st->regmap, AD7768_REG_GENERAL_CONFIG, + AD7768_GEN_CONFIG_VCM_PD); + if (ret) + return ret; + + pm_runtime_put_autosuspend(regmap_get_device(st->regmap)); + + return 0; +} + +static int ad7768_vcm_is_enabled(struct regulator_dev *rdev) +{ + struct ad7768_state *st = rdev_get_drvdata(rdev); + int ret; + + PM_RUNTIME_ACQUIRE_AUTOSUSPEND(regmap_get_device(st->regmap), pm); + ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + if (ret) + return ret; + + ret = regmap_test_bits(st->regmap, AD7768_REG_GENERAL_CONFIG, + AD7768_GEN_CONFIG_VCM_PD); + if (ret < 0) + return ret; + + return !ret; +} + +static int ad7768_vcm_set_voltage_sel(struct regulator_dev *rdev, + unsigned int selector) +{ + struct ad7768_state *st = rdev_get_drvdata(rdev); + int ret; + + PM_RUNTIME_ACQUIRE_AUTOSUSPEND(regmap_get_device(st->regmap), pm); + ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + if (ret) + return ret; + + return regmap_update_bits(st->regmap, AD7768_REG_GENERAL_CONFIG, + AD7768_GEN_CONFIG_VCM_SEL_MSK, + FIELD_PREP(AD7768_GEN_CONFIG_VCM_SEL_MSK, + selector)); +} + +static int ad7768_vcm_get_voltage_sel(struct regulator_dev *rdev) +{ + struct ad7768_state *st = rdev_get_drvdata(rdev); + unsigned int val; + int ret; + + PM_RUNTIME_ACQUIRE_AUTOSUSPEND(regmap_get_device(st->regmap), pm); + ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + if (ret) + return ret; + + ret = regmap_read(st->regmap, AD7768_REG_GENERAL_CONFIG, &val); + if (ret) + return ret; + + return FIELD_GET(AD7768_GEN_CONFIG_VCM_SEL_MSK, val); +} + +static const struct regulator_ops ad7768_vcm_ops = { + .enable = ad7768_vcm_enable, + .disable = ad7768_vcm_disable, + .is_enabled = ad7768_vcm_is_enabled, + .list_voltage = ad7768_vcm_list_voltage, + .set_voltage_sel = ad7768_vcm_set_voltage_sel, + .get_voltage_sel = ad7768_vcm_get_voltage_sel, +}; + +static const struct regulator_desc ad7768_vcm_desc = { + .name = "vcm", + .of_match = of_match_ptr("vcm-output"), + .regulators_node = "regulators", + .n_voltages = ARRAY_SIZE(ad7768_vcm_voltage_table), + .ops = &ad7768_vcm_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, +}; + +static int ad7768_register_vcm_regulator(struct device *dev, + struct ad7768_state *st) +{ + struct regulator_config config = { + .dev = dev, + .driver_data = st, + }; + int ret; + + /* + * Start with VCM disabled so each enabled state is paired with the + * runtime PM reference acquired by ad7768_vcm_enable(). + */ + ret = regmap_set_bits(st->regmap, AD7768_REG_GENERAL_CONFIG, + AD7768_GEN_CONFIG_VCM_PD); + if (ret) + return ret; + + st->vcm_rdev = devm_regulator_register(dev, &ad7768_vcm_desc, &config); + return PTR_ERR_OR_ZERO(st->vcm_rdev); +} + static const int ad7768_dec_rate[MAX_FREQ_PER_MODE] = { 32, 64, 128, 256, 512, 1024, }; @@ -1484,11 +1634,13 @@ static int ad7768_probe(struct spi_device *spi) return dev_err_probe(dev, ret, "Failed to enable AVSS supply\n"); - ret = devm_regulator_get_enable(dev, "avdd1"); - if (ret) + ret = devm_regulator_get_enable_read_voltage(dev, "avdd1"); + if (ret < 0) return dev_err_probe(dev, ret, "Failed to enable AVDD1 supply\n"); + st->avdd1_uV = ret; + ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(ad7768_supply_names), ad7768_supply_names); @@ -1595,6 +1747,11 @@ static int ad7768_probe(struct spi_device *spi) if (ret) return ret; + ret = ad7768_register_vcm_regulator(dev, st); + if (ret) + return dev_err_probe(dev, ret, + "Failed to register VCM regulator\n"); + indio_dev->setup_ops = &ad7768_buffer_ops; ret = devm_iio_device_register(dev, indio_dev); -- 2.43.0