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[61.220.246.151]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34e9224d9e5sm12352454a91.17.2025.12.23.01.12.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Dec 2025 01:12:43 -0800 (PST) From: Kyle Hsieh Date: Tue, 23 Dec 2025 17:12:26 +0800 Subject: [PATCH 2/2] iio: adc: ltc2309: add support for ltc2305 Precedence: bulk X-Mailing-List: linux-iio@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: <20251223-add_ltc2305_driver-v1-2-dfa0827fd620@gmail.com> References: <20251223-add_ltc2305_driver-v1-0-dfa0827fd620@gmail.com> In-Reply-To: <20251223-add_ltc2305_driver-v1-0-dfa0827fd620@gmail.com> To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Liam Beguin Cc: Michael Hennerich , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Kyle Hsieh X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3861; i=kylehsieh1995@gmail.com; h=from:subject:message-id; bh=aYGthVOr7xKF0XzkPUzrKtO6r7O3Qp3wRgl5PgSqd7c=; b=owEBbQGS/pANAwAKAaWDQrcJVsSBAcsmYgBpSl0DbJU7+qtAJ5Jcm/IhA1P/vS3kqmfXjRqYi tx+hLKNX3aJATMEAAEKAB0WIQTJHsaNZOdY+THGqJelg0K3CVbEgQUCaUpdAwAKCRClg0K3CVbE gQzZB/9TP8hJ6vY4N4Vmf/W9HzruOIUsJiDxk4PyJF8qklbVCU10vCiwb7QgFnuBq+pf2fkJ0Mg Uhz8zhnq0rZNGuyxzbDGiDn3dNxxY5cCY2WRbah4PfkWp4r5YltJtlUgHVPsKG/kVx68tCjkdBJ /tKkxGXQhYREHkDiq2k6e7832LM/UfXYrz+wIUKkJpEwbMorkFkQT/aM6LMTgm5roPpV9VjmDrf d5UGjVDNDqK8okJIeX44GS2w6FEB9P+CccDRKBdRSJac0TyxhQ9xxVNKPSubDhAfhFoGRLQKk/I 74L1/vE3WWXVlSismDIqfCuVi/iJNEzNvgYceeDhwafdSJV8 X-Developer-Key: i=kylehsieh1995@gmail.com; a=openpgp; fpr=C91EC68D64E758F931C6A897A58342B70956C481 Add support for the 2-channel LTC2305 ADC in the existing LTC2309 driver. The LTC2305 and LTC2309 share similar features: both are 12-bit, low-noise, low-power SAR ADCs with an I2C interface. The main difference is the number of channels: LTC2305 has 2 channels, while LTC2309 has 8 channels. Signed-off-by: Kyle Hsieh --- drivers/iio/adc/ltc2309.c | 50 +++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 46 insertions(+), 4 deletions(-) diff --git a/drivers/iio/adc/ltc2309.c b/drivers/iio/adc/ltc2309.c index 5f0d947d0615..7a611ddd00d2 100644 --- a/drivers/iio/adc/ltc2309.c +++ b/drivers/iio/adc/ltc2309.c @@ -1,9 +1,11 @@ // SPDX-License-Identifier: GPL-2.0 /* * The LTC2309 is an 8-Channel, 12-Bit SAR ADC with an I2C Interface. + * The LTC2305 is a 2-Channel, 12-Bit SAR ADC with an I2C Interface. * * Datasheet: * https://www.analog.com/media/en/technical-documentation/data-sheets/2309fd.pdf + * https://www.analog.com/media/en/technical-documentation/data-sheets/23015fb.pdf * * Copyright (c) 2023, Liam Beguin */ @@ -60,6 +62,13 @@ enum ltc2309_channels { LTC2309_CH7, }; +enum ltc2305_channels { + LTC2305_CH0_CH1 = 0, + LTC2305_CH1_CH0, + LTC2305_CH0, + LTC2305_CH1, +}; + #define LTC2309_CHAN(_chan, _addr) { \ .type = IIO_VOLTAGE, \ .indexed = 1, \ @@ -99,6 +108,31 @@ static const struct iio_chan_spec ltc2309_channels[] = { LTC2309_DIFF_CHAN(7, 6, LTC2309_CH7_CH6), }; +static const struct iio_chan_spec ltc2305_channels[] = { + LTC2309_CHAN(0, LTC2305_CH0), + LTC2309_CHAN(1, LTC2305_CH1), + LTC2309_DIFF_CHAN(0, 1, LTC2305_CH0_CH1), + LTC2309_DIFF_CHAN(1, 0, LTC2305_CH1_CH0), +}; + +struct ltc230x_chip_info { + const char *name; + const struct iio_chan_spec *channels; + int num_channels; +}; + +static const struct ltc230x_chip_info ltc2309_chip_info = { + .name = "ltc2309", + .channels = ltc2309_channels, + .num_channels = ARRAY_SIZE(ltc2309_channels), +}; + +static const struct ltc230x_chip_info ltc2305_chip_info = { + .name = "ltc2305", + .channels = ltc2305_channels, + .num_channels = ARRAY_SIZE(ltc2305_channels), +}; + static int ltc2309_read_raw_channel(struct ltc2309 *ltc2309, unsigned long address, int *val) { @@ -158,6 +192,8 @@ static const struct iio_info ltc2309_info = { static int ltc2309_probe(struct i2c_client *client) { + const struct of_device_id *match; + const struct ltc230x_chip_info *chip_info; struct iio_dev *indio_dev; struct ltc2309 *ltc2309; int ret; @@ -167,13 +203,17 @@ static int ltc2309_probe(struct i2c_client *client) return -ENOMEM; ltc2309 = iio_priv(indio_dev); + chip_info = device_get_match_data(&client->dev); + if (!chip_info) + return -EINVAL; + ltc2309->dev = &indio_dev->dev; ltc2309->client = client; - indio_dev->name = "ltc2309"; + indio_dev->name = chip_info->name; indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = ltc2309_channels; - indio_dev->num_channels = ARRAY_SIZE(ltc2309_channels); + indio_dev->channels = chip_info->channels; + indio_dev->num_channels = chip_info->num_channels; indio_dev->info = <c2309_info; ret = devm_regulator_get_enable_read_voltage(&client->dev, "vref"); @@ -189,13 +229,15 @@ static int ltc2309_probe(struct i2c_client *client) } static const struct of_device_id ltc2309_of_match[] = { - { .compatible = "lltc,ltc2309" }, + { .compatible = "lltc,ltc2309", .data = <c2309_chip_info }, + { .compatible = "lltc,ltc2305", .data = <c2305_chip_info }, { } }; MODULE_DEVICE_TABLE(of, ltc2309_of_match); static const struct i2c_device_id ltc2309_id[] = { { "ltc2309" }, + { "ltc2305" }, { } }; MODULE_DEVICE_TABLE(i2c, ltc2309_id); -- 2.34.1