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Tue, 24 Mar 2026 03:14:13 -0400 From: Carlos Jones Jr To: Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , David Lechner , Michael Hennerich , Liam Beguin , =?UTF-8?q?Nuno=20S=C3=A1?= , "Andy Shevchenko" , Tobias Sperling , Jorge Marques CC: , , Subject: [PATCH v2 4/4] iio: adc: ltc2309: Add LTC2305 support Date: Tue, 24 Mar 2026 15:13:31 +0800 Message-ID: <20260324071331.842-5-carlosjr.jones@analog.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260324071331.842-1-carlosjr.jones@analog.com> References: <20260324071331.842-1-carlosjr.jones@analog.com> 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 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI0MDA1NyBTYWx0ZWRfX1mTazD52ASzV E1Wr6vjj8W/70PJiMWDcf4hMTE+ONYBLyweam4GQSwu2neVSMkYIgGweLHGzdOMf+jOMJm2oUv2 JAa/nh86hO9LD8iDIMD/xvFKcb3GfWpCtDwBhJSt+JfyBcXyC9oTXS+QGOpdbLcg3LKJaObDzSS yBdUVc8dOalmFTQDmeDc1Y8UvR+pe8nOL794HI3/WmmpRhsuH4UUpbdc/TR6QI0MA/icxixbxah vgesJZB33cwWebGOV92Alb3kcTsfmsJUYLh06tazrMChCBkr21gTRGwBjnJgG/mobyWUr8f7XQc ha8b0cDuasUxzWbXMBMf3I/DQoHLEMUr9CoR6xGcJ+5SgtoqroZPqiCVOT89Rru/L/4yQfNS97z cJ0k9HpzqQpD3m0+DLiPZe1gUG74nPrOjzu7L8OFfEc7OQts3y5nkGfVmNwiv6AaHl6meY+XD1e GsdAbs6HBBNPQIdKKKw== X-Proofpoint-ORIG-GUID: t90mSKuwfX-O7O07uQDE82CnPk5mihv9 X-Proofpoint-GUID: t90mSKuwfX-O7O07uQDE82CnPk5mihv9 X-Authority-Analysis: v=2.4 cv=D59K6/Rj c=1 sm=1 tr=0 ts=69c239d0 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=uXIjobp8t2wMuQ0fPvqm:22 a=gAnH3GRIAAAA:8 a=pGLkceISAAAA:8 a=6VD43Srf4_-BMiEuy00A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-24_02,2026-03-23_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 adultscore=0 impostorscore=0 clxscore=1015 spamscore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603240057 Add support for the LTC2305, a 2-channel, 12-bit SAR ADC that shares the same I2C interface as the LTC2309. The LTC2305 differs from the LTC2309 in: - Channel configuration: 2 single-ended + 2 differential vs 8 single-ended + 8 differential - Read timing: Requires 2=CE=BCs delay (1.6=CE=BCs rounded up) between I2C write and read operations Device tree binding added in previous commit. Signed-off-by: Carlos Jones Jr Reviewed-by: Andy Shevchenko --- drivers/iio/adc/Kconfig | 8 +++++--- drivers/iio/adc/ltc2309.c | 25 +++++++++++++++++++++++-- 2 files changed, 28 insertions(+), 5 deletions(-) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index a9dedbb8eb46..860c0909dbbb 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -915,11 +915,13 @@ config LPC32XX_ADC via sysfs. =20 config LTC2309 - tristate "Linear Technology LTC2309 ADC driver" + tristate "Linear Technology LTC2309 and similar ADC driver" depends on I2C help - Say yes here to build support for Linear Technology LTC2309, a low - noise, low power, 8-channel, 12-bit SAR ADC + Say yes here to build support for Linear Technology low noise, + low power 12-bit SAR ADCs: + - LTC2305 - 2-channel + - LTC2309 - 8-channel =20 This driver can also be built as a module. If so, the module will be called ltc2309. diff --git a/drivers/iio/adc/ltc2309.c b/drivers/iio/adc/ltc2309.c index 475ecc21ebe9..d7ec4d92a96c 100644 --- a/drivers/iio/adc/ltc2309.c +++ b/drivers/iio/adc/ltc2309.c @@ -1,9 +1,14 @@ // SPDX-License-Identifier: GPL-2.0 /* - * The LTC2309 is an 8-Channel, 12-Bit SAR ADC with an I2C Interface. + * Low noise, low power 12-Bit SAR ADC with an I2C Interface. + * + * Supported devices: + * LTC2305 - 2-channel + * LTC2309 - 8-channel * * Datasheet: * https://www.analog.com/media/en/technical-documentation/data-sheets/230= 9fd.pdf + * https://www.analog.com/media/en/technical-documentation/data-sheets/230= 15fb.pdf * * Copyright (c) 2023, Liam Beguin */ @@ -110,6 +115,13 @@ static const struct iio_chan_spec ltc2309_channels[] = =3D { LTC2309_DIFF_CHAN(7, 6, LTC2309_CH7_CH6), }; =20 +static const struct iio_chan_spec ltc2305_channels[] =3D { + LTC2309_CHAN(0, LTC2309_CH0), + LTC2309_CHAN(1, LTC2309_CH1), + LTC2309_DIFF_CHAN(0, 1, LTC2309_CH0_CH1), + LTC2309_DIFF_CHAN(1, 0, LTC2309_CH1_CH0), +}; + static int ltc2309_read_raw_channel(struct ltc2309 *ltc2309, unsigned long address, int *val) { @@ -170,6 +182,13 @@ static const struct iio_info ltc2309_info =3D { .read_raw =3D ltc2309_read_raw, }; =20 +static const struct ltc2309_chip_info ltc2305_chip_info =3D { + .name =3D "ltc2305", + .num_channels =3D ARRAY_SIZE(ltc2305_channels), + .channels =3D ltc2305_channels, + .read_delay_us =3D 2, +}; + static const struct ltc2309_chip_info ltc2309_chip_info =3D { .name =3D "ltc2309", .num_channels =3D ARRAY_SIZE(ltc2309_channels), @@ -213,12 +232,14 @@ static int ltc2309_probe(struct i2c_client *client) } =20 static const struct of_device_id ltc2309_of_match[] =3D { + { .compatible =3D "lltc,ltc2305", .data =3D <c2305_chip_info }, { .compatible =3D "lltc,ltc2309", .data =3D <c2309_chip_info }, { } }; MODULE_DEVICE_TABLE(of, ltc2309_of_match); =20 static const struct i2c_device_id ltc2309_id[] =3D { + { "ltc2305", (kernel_ulong_t)<c2305_chip_info }, { "ltc2309", (kernel_ulong_t)<c2309_chip_info }, { } }; @@ -235,5 +256,5 @@ static struct i2c_driver ltc2309_driver =3D { module_i2c_driver(ltc2309_driver); =20 MODULE_AUTHOR("Liam Beguin "); -MODULE_DESCRIPTION("Linear Technology LTC2309 ADC"); +MODULE_DESCRIPTION("Linear Technology LTC2305/LTC2309 ADC driver"); MODULE_LICENSE("GPL v2"); --=20 2.43.0