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[200.61.172.117]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3537cacb5e9sm13009650eec.20.2026.10.09.23.53.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2026 23:53:56 -0700 (PDT) From: Kurt Borja Date: Sat, 10 Oct 2026 03:52:49 -0300 Subject: [PATCH v5 10/10] iio: adc: ti-ads1262: support common mode supplies 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: 7bit Message-Id: <20261010-ads126x-v5-10-49e331cb2fed@gmail.com> References: <20261010-ads126x-v5-0-49e331cb2fed@gmail.com> In-Reply-To: <20261010-ads126x-v5-0-49e331cb2fed@gmail.com> To: Kurt Borja , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , David Lechner Cc: =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2778; i=kuurtb@gmail.com; h=from:subject:message-id; bh=KCiU9H7oAsfJb+wOCJGHY+ftuBOqit3svB97TjTz8Ps=; b=owGbwMvMwCUmluBs8WX+lTTG02pJDFknHzz77dK1n8X0pfahdSv6X2ZNUDC6qdJmevSzkITFY ueT6qprO0pZGMS4GGTFFFnaExZ9exSV99bvQOh9mDmsTCBDGLg4BWAiR0MYGVp+bharN+WTX/4s ojv93Ikti4vNp65V7q5kXlO4bavwg52MDL/yas4FZNqtWfwz4gu/jaHVATvLto7X04+62vjoHKl 7zQoA X-Developer-Key: i=kuurtb@gmail.com; a=openpgp; fpr=54D3BE170AEF777983C3C63B57E3B6585920A69A Enable common mode regulators. The usual configuration is to have our own 'vbias' regulator connected internally as common mode voltage on the AINCOM pin. Signed-off-by: Kurt Borja --- drivers/iio/adc/ti-ads1262.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/iio/adc/ti-ads1262.c b/drivers/iio/adc/ti-ads1262.c index 5bb41b70353f..66a7fedfefde 100644 --- a/drivers/iio/adc/ti-ads1262.c +++ b/drivers/iio/adc/ti-ads1262.c @@ -241,6 +241,7 @@ struct ads1262 { u32 rref_ohms[ADS1262_EXT_REF_COUNT][ADS1262_EXT_REF_COUNT]; int refp_uV[ADS1262_EXT_REF_COUNT]; int refn_uV[ADS1262_EXT_REF_COUNT]; + int common_mode_uV[ADS1262_INPMUX_AINCOM + 1]; IIO_DECLARE_BUFFER_WITH_TS(__be32, scan_buffer, ADS1262_FW_CHANNEL_COUNT + ADS1262_MON_CHANNEL_COUNT); @@ -690,6 +691,13 @@ static int ads1262_read_raw(struct iio_dev *indio_dev, scale * ADS1262_TEMP_SLOPE_uV_C); iio_val_s64_decompose(offset, val, val2); + return IIO_VAL_INT_64; + + case IIO_VOLTAGE: + offset = mul_u64_u64_div_u64(st->common_mode_uV[chan->channel2], + NANO, scale); + iio_val_s64_decompose(offset, val, val2); + return IIO_VAL_INT_64; default: return -EOPNOTSUPP; @@ -1123,6 +1131,28 @@ static irqreturn_t ads1262_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } +static int ads1262_parse_common_mode_supplies(struct ads1262 *st) +{ + struct device *dev = &st->spi->dev; + char name[sizeof("aincom")]; + int ret; + + for (unsigned int i = 0; i <= ADS1262_INPMUX_AINCOM; i++) { + if (i < ADS1262_INPMUX_AINCOM) + scnprintf(name, sizeof(name), "ain%u", i); + else + scnprintf(name, sizeof(name), "aincom"); + + ret = devm_regulator_get_enable_read_voltage(dev, name); + if (ret < 0 && ret != -ENODEV) + return dev_err_probe(dev, ret, + "failed to get common mode supply: %s\n", name); + st->common_mode_uV[i] = ret != -ENODEV ? ret : 0; + } + + return 0; +} + static int ads1262_vbias_enable(struct regulator_dev *rdev) { struct ads1262 *st = rdev_get_drvdata(rdev); @@ -1876,6 +1906,9 @@ static int ads1262_parse_channels(struct iio_dev *indio_dev) spec->info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_SCALE); + if (!chan->is_resistance && !spec->differential) + spec->info_mask_separate |= BIT(IIO_CHAN_INFO_OFFSET); + i++; } @@ -2027,6 +2060,10 @@ static int ads1262_spi_probe(struct spi_device *spi) if (ret) return ret; + ret = ads1262_parse_common_mode_supplies(st); + if (ret) + return ret; + ret = ads1262_populate_tables(indio_dev); if (ret) return ret; -- 2.55.0