* [PATCH v4 1/2] dt-bindings: iio: adc: add Texas Instruments TLA2528
2026-11-13 15:15 [PATCH v4 0/2] iio: adc: add driver for Texas Instruments TLA2528 adc Maxime Chevallier
@ 2026-11-13 15:15 ` Maxime Chevallier
2026-11-13 15:15 ` [PATCH v4 2/2] iio: adc: add driver for Texas Instruments TLA2528 adc Maxime Chevallier
1 sibling, 0 replies; 7+ messages in thread
From: Maxime Chevallier @ 2026-11-13 15:15 UTC (permalink / raw)
To: Jonathan Cameron, David Lechner, Nuno Sá, Andy Shevchenko,
Rob Herring, Krzysztof Kozlowski, Conor Dooley
Cc: Maxime Chevallier, Matti Vaittinen, Rodolfo Giometti,
Marcelo Schmitt, Antoniu Miclaus, Angelo Dureghello,
Tobias Sperling, Eason Yang, Marilene Andrade Garcia,
Cosmin Tanislav, duje, Joshua Crofts, Uwe Kleine-König,
Victor Chernyakin, herve.codina, thomas.petazzoni, linux-iio,
devicetree, linux-kernel, Conor Dooley
The TI TLA2528 is a simple 8-channel, 12-bit ADC and GPIO chip
accessible over i2c. The ADC part has an AVDD supply that doubles as a
reference.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
.../bindings/iio/adc/ti,tla2528.yaml | 91 +++++++++++++++++++
MAINTAINERS | 5 +
2 files changed, 96 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,tla2528.yaml
diff --git a/Documentation/devicetree/bindings/iio/adc/ti,tla2528.yaml b/Documentation/devicetree/bindings/iio/adc/ti,tla2528.yaml
new file mode 100644
index 000000000000..7a50a5026c1e
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti,tla2528.yaml
@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,tla2528.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments TLA2528 8-channel 12-bit I2C ADC
+
+maintainers:
+ - Maxime Chevallier <maxime.chevallier@bootlin.com>
+
+description:
+ Each of the 8 input pins can be configured as an analog input, a digital
+ input or a digital output.
+
+properties:
+ compatible:
+ const: ti,tla2528
+
+ reg:
+ maxItems: 1
+
+ avdd-supply:
+ description: Analog supply, also used as the ADC reference voltage.
+
+ dvdd-supply: true
+
+ gpio-controller: true
+
+ "#gpio-cells":
+ const: 2
+
+ "#io-channel-cells":
+ const: 1
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+patternProperties:
+ "^channel@[0-7]$":
+ type: object
+ $ref: adc.yaml
+ description: Represents an analog input.
+
+ properties:
+ reg:
+ description: AIN pin number
+ minimum: 0
+ maximum: 7
+
+ required:
+ - reg
+
+ unevaluatedProperties: false
+
+required:
+ - compatible
+ - reg
+ - avdd-supply
+ - dvdd-supply
+
+additionalProperties: false
+
+examples:
+ - |
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@17 {
+ compatible = "ti,tla2528";
+ reg = <0x17>;
+ avdd-supply = <®_adc_supply>;
+ dvdd-supply = <®_adc_supply>;
+ #io-channel-cells = <1>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel@0 {
+ reg = <0>;
+ };
+
+ channel@3 {
+ reg = <3>;
+ };
+ };
+ };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 93abbb315065..2cf3fc9bb74d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -27758,6 +27758,11 @@ F: include/dt-bindings/soc/ti,sci_pm_domain.h
F: include/linux/soc/ti/ti_sci_inta_msi.h
F: include/linux/soc/ti/ti_sci_protocol.h
+TEXAS INSTRUMENTS' TLA2528 ADC DRIVER
+M: Maxime Chevallier <maxime.chevallier@bootlin.com>
+S: Supported
+F: Documentation/devicetree/bindings/iio/adc/ti,tla2528.yaml
+
TEXAS INSTRUMENTS' TMP117 TEMPERATURE SENSOR DRIVER
M: Puranjay Mohan <puranjay@kernel.org>
L: linux-iio@vger.kernel.org
--
2.56.0
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH v4 2/2] iio: adc: add driver for Texas Instruments TLA2528 adc
2026-11-13 15:15 [PATCH v4 0/2] iio: adc: add driver for Texas Instruments TLA2528 adc Maxime Chevallier
2026-11-13 15:15 ` [PATCH v4 1/2] dt-bindings: iio: adc: add Texas Instruments TLA2528 Maxime Chevallier
@ 2026-11-13 15:15 ` Maxime Chevallier
2026-11-13 15:26 ` Joshua Crofts
` (2 more replies)
1 sibling, 3 replies; 7+ messages in thread
From: Maxime Chevallier @ 2026-11-13 15:15 UTC (permalink / raw)
To: Jonathan Cameron, David Lechner, Nuno Sá, Andy Shevchenko,
Rob Herring, Krzysztof Kozlowski, Conor Dooley
Cc: Maxime Chevallier, Matti Vaittinen, Rodolfo Giometti,
Marcelo Schmitt, Antoniu Miclaus, Angelo Dureghello,
Tobias Sperling, Eason Yang, Marilene Andrade Garcia,
Cosmin Tanislav, duje, Joshua Crofts, Uwe Kleine-König,
Victor Chernyakin, herve.codina, thomas.petazzoni, linux-iio,
devicetree, linux-kernel
Add a new driver for the TI TLA2528 ADC chip. It has 8 12-bit
channels, that can also be configured as 16-bit averaging channels.
This is a very simple driver, allowing reading raw values for each
channel. GPIO mode isn't supported for now, as well as buffered mode and
the 16-bit averaging mode.
Co-developed-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
MAINTAINERS | 1 +
drivers/iio/adc/Kconfig | 12 ++
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ti-tla2528.c | 218 +++++++++++++++++++++++++++++++++++
4 files changed, 232 insertions(+)
create mode 100644 drivers/iio/adc/ti-tla2528.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 2cf3fc9bb74d..59e960d7e547 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -27762,6 +27762,7 @@ TEXAS INSTRUMENTS' TLA2528 ADC DRIVER
M: Maxime Chevallier <maxime.chevallier@bootlin.com>
S: Supported
F: Documentation/devicetree/bindings/iio/adc/ti,tla2528.yaml
+F: drivers/iio/adc/ti-tla2528.c
TEXAS INSTRUMENTS' TMP117 TEMPERATURE SENSOR DRIVER
M: Puranjay Mohan <puranjay@kernel.org>
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index a802d8ee4dd9..8633267d6056 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -2016,6 +2016,18 @@ config TI_LMP92064
This driver can also be built as a module. If so, the module will be called
ti-lmp92064.
+config TI_TLA2528
+ tristate "Texas Instruments TLA2528 ADC driver"
+ depends on I2C
+ select REGMAP_I2C
+ select IIO_ADC_HELPER
+ help
+ Say yes here to build support for Texas Instruments TLA2528
+ 12-Bit 8-Channel ADC.
+
+ To compile this driver as a module, choose M here: the module will be
+ called ti-tla2528.
+
config TI_TLC4541
tristate "Texas Instruments TLC4541 ADC driver"
depends on SPI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 9e82c21dbd37..b98cded4d0c7 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -171,6 +171,7 @@ obj-$(CONFIG_TI_ADS8344) += ti-ads8344.o
obj-$(CONFIG_TI_ADS8688) += ti-ads8688.o
obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
obj-$(CONFIG_TI_LMP92064) += ti-lmp92064.o
+obj-$(CONFIG_TI_TLA2528) += ti-tla2528.o
obj-$(CONFIG_TI_TLC4541) += ti-tlc4541.o
obj-$(CONFIG_TI_TSC2046) += ti-tsc2046.o
obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o
diff --git a/drivers/iio/adc/ti-tla2528.c b/drivers/iio/adc/ti-tla2528.c
new file mode 100644
index 000000000000..c02b04e19785
--- /dev/null
+++ b/drivers/iio/adc/ti-tla2528.c
@@ -0,0 +1,218 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Texas Instruments TLA2528 ADC
+ *
+ * Copyright (C) 2020-2021 Rodolfo Giometti <giometti@enneenne.com>
+ * Copyright (C) 2025 Maxime Chevallier <maxime.chevallier@bootlin.com>
+ * Datasheet: https://www.ti.com/lit/gpn/tla2528
+ */
+
+#include <linux/bits.h>
+#include <linux/cleanup.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#include <asm/byteorder.h>
+
+#include <linux/iio/adc-helpers.h>
+#include <linux/iio/iio.h>
+
+#define TLA2528_OP_WRITE_REG 0x08
+#define TLA2528_OP_READ_REG 0x10
+
+#define TLA2528_GENERAL_CFG_ADR 0x01
+#define TLA2528_GENERAL_CFG_RST BIT(0)
+#define TLA2528_CHANNEL_SEL_ADR 0x11
+#define TLA2528_CHANNEL_SEL_MANUAL_CHID GENMASK(3, 0)
+#define TLA2528_AUTO_SEQ_CH_SEL_ADR 0x12
+
+#define TLA2528_NUM_CHANNELS 8
+
+struct tla2528 {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ int vref_mV;
+
+ /* Protects manual channel selection */
+ struct mutex lock;
+};
+
+static bool tla2528_volatile_reg(struct device *dev, unsigned int reg)
+{
+ return reg == TLA2528_GENERAL_CFG_ADR;
+}
+
+static const struct regmap_config tla2528_regmap_config = {
+ .reg_bits = 16,
+ .val_bits = 8,
+ .read_flag_mask = TLA2528_OP_READ_REG,
+ .write_flag_mask = TLA2528_OP_WRITE_REG,
+ .max_register = TLA2528_AUTO_SEQ_CH_SEL_ADR,
+ .volatile_reg = tla2528_volatile_reg,
+ .cache_type = REGCACHE_MAPLE,
+};
+
+static int tla2528_read(struct tla2528 *tla2528, u8 channel, int *val)
+{
+ __be16 data;
+ int ret;
+
+ guard(mutex)(&tla2528->lock);
+
+ ret = regmap_update_bits(tla2528->regmap, TLA2528_CHANNEL_SEL_ADR,
+ TLA2528_CHANNEL_SEL_MANUAL_CHID, channel);
+ if (ret)
+ return ret;
+
+ ret = i2c_master_recv(tla2528->client, (char *)&data, sizeof(data));
+ if (ret < 0)
+ return ret;
+ if (ret != sizeof(data))
+ return -EIO;
+
+ *val = be16_to_cpu(data) >> 4;
+
+ return 0;
+}
+
+static int tla2528_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct tla2528 *tla2528 = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = tla2528_read(tla2528, chan->channel, val);
+ if (ret < 0)
+ return ret;
+
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_SCALE:
+ *val = tla2528->vref_mV;
+ *val2 = 12;
+
+ return IIO_VAL_FRACTIONAL_LOG2;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+#define TLA2528_CHAN(chan) { \
+ .type = IIO_VOLTAGE, \
+ .channel = (chan), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .indexed = 1, \
+}
+
+static const struct iio_chan_spec tla2528_chan_template = TLA2528_CHAN(0);
+
+static const struct iio_info tla2528_info = {
+ .read_raw = tla2528_read_raw,
+};
+
+static int tla2528_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct iio_chan_spec *channels;
+ struct iio_dev *indio_dev;
+ struct tla2528 *tla2528;
+ int ret;
+
+ /*
+ * We're reading the data with raw i2c reads, without passing an
+ * address like we would for smbus-style accesses.
+ */
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -EOPNOTSUPP;
+
+ if (i2c_check_quirks(client->adapter, I2C_AQ_NO_CLK_STRETCH))
+ return dev_err_probe(dev, -EOPNOTSUPP,
+ "adapter does not support clock stretching\n");
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*tla2528));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ tla2528 = iio_priv(indio_dev);
+ tla2528->client = client;
+
+ tla2528->regmap = devm_regmap_init_i2c(client, &tla2528_regmap_config);
+ if (IS_ERR(tla2528->regmap))
+ return PTR_ERR(tla2528->regmap);
+
+ ret = devm_mutex_init(dev, &tla2528->lock);
+ if (ret)
+ return ret;
+
+ ret = devm_regulator_get_enable(dev, "dvdd");
+ if (ret)
+ return ret;
+
+ ret = devm_regulator_get_enable_read_voltage(dev, "avdd");
+ if (ret < 0)
+ return ret;
+
+ tla2528->vref_mV = ret / (MICRO / MILLI);
+
+ ret = devm_iio_adc_device_alloc_chaninfo_se(dev, &tla2528_chan_template,
+ TLA2528_NUM_CHANNELS - 1,
+ &channels);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "failed to get ADC channels\n");
+
+ indio_dev->channels = channels;
+ indio_dev->num_channels = ret;
+
+ indio_dev->name = "tla2528";
+ indio_dev->info = &tla2528_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = regmap_write(tla2528->regmap, TLA2528_GENERAL_CFG_ADR,
+ TLA2528_GENERAL_CFG_RST);
+ if (ret)
+ return ret;
+
+ fsleep(5 * USEC_PER_MSEC);
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct i2c_device_id tla2528_id[] = {
+ { .name = "tla2528" },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tla2528_id);
+
+static const struct of_device_id tla2528_of_match[] = {
+ { .compatible = "ti,tla2528" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tla2528_of_match);
+
+static struct i2c_driver tla2528_driver = {
+ .driver = {
+ .name = "tla2528",
+ .of_match_table = tla2528_of_match,
+ },
+ .probe = tla2528_probe,
+ .id_table = tla2528_id,
+};
+module_i2c_driver(tla2528_driver);
+
+MODULE_AUTHOR("Maxime Chevallier <maxime.chevallier@bootlin.com>");
+MODULE_AUTHOR("Rodolfo Giometti <giometti@enneenne.com>");
+MODULE_DESCRIPTION("Texas Instruments TLA2528 ADC driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_DRIVER");
--
2.56.0
^ permalink raw reply related [flat|nested] 7+ messages in thread