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[61.220.246.151]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c635a1309dfsm7010359a12.6.2026.01.25.17.29.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Jan 2026 17:29:58 -0800 (PST) From: Kyle Hsieh Date: Mon, 26 Jan 2026 09:29:41 +0800 Subject: [PATCH v3 1/2] dt-bindings: adc: ltc2497: add support for ltc2305 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 Message-Id: <20260126-add_ltc2305_driver-v3-1-951349a87f97@gmail.com> References: <20260126-add_ltc2305_driver-v3-0-951349a87f97@gmail.com> In-Reply-To: <20260126-add_ltc2305_driver-v3-0-951349a87f97@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=1469; i=kylehsieh1995@gmail.com; h=from:subject:message-id; bh=S8OEpcXpBEONfmjqfR3syMAXK/IV6W+U/9C5wzdJYO0=; b=owEBbQGS/pANAwAKAaWDQrcJVsSBAcsmYgBpdsOQLuw0cN6rc/rw/ZauqQb9eFcDov8xkV6jZ TBh6je1UiOJATMEAAEKAB0WIQTJHsaNZOdY+THGqJelg0K3CVbEgQUCaXbDkAAKCRClg0K3CVbE gdRAB/425xk+uGr6mgYPZvX4GOzehEQD6w9/7E9SbYEp8sVP5YpSDlk95deXw3cXX5y5EqYcUv0 W32dkQvj1TSY9iCT1lKkl3EGih5imyLOlJLNuVPARK+9FPmQLOKyeE9zBrUC2Eedjr66o7GOl3Q rWPa4gfJd03cYMitIy1a/tUb77u3Vnt0q7F6A2fOuTMOy4paprmhFoF+mdrW41RWDo6eo0AsG13 HgWUxqpPbuDBA1A7nbXE/m8d2G8qLIEFtEs8u33kmMDKauKi78k0FX9n4xn6wwkydDFC2AGQNyE QiVcSYXBXyUYfJis7V0o/zTLxKPz2AkTj+SPZxkMW8x4J+r9 X-Developer-Key: i=kylehsieh1995@gmail.com; a=openpgp; fpr=C91EC68D64E758F931C6A897A58342B70956C481 Add documentation for the 2-channel LTC2305 ADC in the existing ltc2497 binding. This enables automatic device tree matching for LTC2305 while using the LTC2309 driver (drivers/iio/adc/ltc2309.c), since both ADCs share the same I2C interface and 12-bit SAR architecture. The main difference is the number of channels (LTC2305: 2, LTC2309: 8). Signed-off-by: Kyle Hsieh Reviewed-by: Rob Herring (Arm) --- Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml b/= Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml index 5cc6a9684077..c884b6e03767 100644 --- a/Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml +++ b/Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml @@ -11,6 +11,12 @@ maintainers: - Liam Beguin =20 description: | + LTC2305: + low noise, low power, 2-channel, 12-bit successive approximation ADC w= ith an + I2C compatible serial interface. + + https://www.analog.com/media/en/technical-documentation/data-sheets/23= 015fb.pdf + LTC2309: low noise, low power, 8-channel, 12-bit successive approximation ADC w= ith an I2C compatible serial interface. @@ -28,6 +34,7 @@ description: | properties: compatible: enum: + - lltc,ltc2305 - lltc,ltc2309 - lltc,ltc2497 - lltc,ltc2499 --=20 2.34.1 From nobody Sun Feb 8 17:46:34 2026 Received: from mail-pg1-f173.google.com (mail-pg1-f173.google.com [209.85.215.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 964321DDC37 for ; 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[61.220.246.151]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c635a1309dfsm7010359a12.6.2026.01.25.17.29.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Jan 2026 17:30:01 -0800 (PST) From: Kyle Hsieh Date: Mon, 26 Jan 2026 09:29:42 +0800 Subject: [PATCH v3 2/2] iio: adc: ltc2309: add support for ltc2305 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 Message-Id: <20260126-add_ltc2305_driver-v3-2-951349a87f97@gmail.com> References: <20260126-add_ltc2305_driver-v3-0-951349a87f97@gmail.com> In-Reply-To: <20260126-add_ltc2305_driver-v3-0-951349a87f97@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=4100; i=kylehsieh1995@gmail.com; h=from:subject:message-id; bh=qjqG/4Tak5dcEPBHNEyOcH6tCeLxc2+lSgf0SX/Zx7w=; b=owEBbQGS/pANAwAKAaWDQrcJVsSBAcsmYgBpdsOQCaip7zE/WdM3kQ3WWIUgNU7dYH65hWN8I HdLO7QhhACJATMEAAEKAB0WIQTJHsaNZOdY+THGqJelg0K3CVbEgQUCaXbDkAAKCRClg0K3CVbE gbiQB/458twWSGoVgfHr7oQIGVWS/4QkrfjL5nO8l+jBP9IX7n8dsKiiHyImU/Z6RyE+BDFV97N Ypo1of9SEL61gVzY0kMeYfzuh7wPy+WHDAPEAiB8mFvkvhJaRewI0ktpwLVgKA3WPNU0NzNEhih vDHD/a5jZy+5jxW682u/ePnYToZcmPsxZRVOHb6V2e0nbWjEzk9G36hGWDFfG3WkZCyJRq0DHgp 0ZYJ2MA8umzx2GkwqMeSijHQBwAltQJXmJCrpx6kdkgsTeCV5Uc5cpregJBh5HqYWKmYuy+bonx W1oPM6iiu43JA9ayGEAYXkCrUMo6zMMlLKMpUS244EG+aOSb 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 | 48 ++++++++++++++++++++++++++++++++++++++++++-= ---- 1 file changed, 43 insertions(+), 5 deletions(-) diff --git a/drivers/iio/adc/ltc2309.c b/drivers/iio/adc/ltc2309.c index 5f0d947d0615..25acf7f5331a 100644 --- a/drivers/iio/adc/ltc2309.c +++ b/drivers/iio/adc/ltc2309.c @@ -1,8 +1,10 @@ // SPDX-License-Identifier: GPL-2.0 /* + * The LTC2305 is a 2-Channel, 12-Bit SAR ADC with an I2C Interface. * The LTC2309 is an 8-Channel, 12-Bit SAR ADC with an I2C Interface. * * Datasheet: + * https://www.analog.com/media/en/technical-documentation/data-sheets/230= 15fb.pdf * https://www.analog.com/media/en/technical-documentation/data-sheets/230= 9fd.pdf * * Copyright (c) 2023, Liam Beguin @@ -41,6 +43,13 @@ struct ltc2309 { }; =20 /* Order matches expected channel address, See datasheet Table 1. */ +enum ltc2305_channels { + LTC2305_CH0_CH1 =3D 0x0, + LTC2305_CH1_CH0 =3D 0x4, + LTC2305_CH0 =3D 0x8, + LTC2305_CH1 =3D 0xc, +}; + enum ltc2309_channels { LTC2309_CH0_CH1 =3D 0, LTC2309_CH2_CH3, @@ -80,6 +89,13 @@ enum ltc2309_channels { .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_SCALE), \ } =20 +static const struct iio_chan_spec ltc2305_channels[] =3D { + 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), +}; + static const struct iio_chan_spec ltc2309_channels[] =3D { LTC2309_CHAN(0, LTC2309_CH0), LTC2309_CHAN(1, LTC2309_CH1), @@ -99,6 +115,24 @@ static const struct iio_chan_spec ltc2309_channels[] = =3D { LTC2309_DIFF_CHAN(7, 6, LTC2309_CH7_CH6), }; =20 +struct ltc2309_chip_info { + const char *name; + const struct iio_chan_spec *channels; + int num_channels; +}; + +static const struct ltc2309_chip_info ltc2305_chip_info =3D { + .name =3D "ltc2305", + .channels =3D ltc2305_channels, + .num_channels =3D ARRAY_SIZE(ltc2305_channels), +}; + +static const struct ltc2309_chip_info ltc2309_chip_info =3D { + .name =3D "ltc2309", + .channels =3D ltc2309_channels, + .num_channels =3D ARRAY_SIZE(ltc2309_channels), +}; + static int ltc2309_read_raw_channel(struct ltc2309 *ltc2309, unsigned long address, int *val) { @@ -158,6 +192,7 @@ static const struct iio_info ltc2309_info =3D { =20 static int ltc2309_probe(struct i2c_client *client) { + const struct ltc2309_chip_info *chip_info; struct iio_dev *indio_dev; struct ltc2309 *ltc2309; int ret; @@ -167,13 +202,14 @@ static int ltc2309_probe(struct i2c_client *client) return -ENOMEM; =20 ltc2309 =3D iio_priv(indio_dev); + ltc2309->dev =3D &indio_dev->dev; ltc2309->client =3D client; =20 - indio_dev->name =3D "ltc2309"; + indio_dev->name =3D chip_info->name; indio_dev->modes =3D INDIO_DIRECT_MODE; - indio_dev->channels =3D ltc2309_channels; - indio_dev->num_channels =3D ARRAY_SIZE(ltc2309_channels); + indio_dev->channels =3D chip_info->channels; + indio_dev->num_channels =3D chip_info->num_channels; indio_dev->info =3D <c2309_info; =20 ret =3D devm_regulator_get_enable_read_voltage(&client->dev, "vref"); @@ -189,13 +225,15 @@ static int ltc2309_probe(struct i2c_client *client) } =20 static const struct of_device_id ltc2309_of_match[] =3D { - { .compatible =3D "lltc,ltc2309" }, + { .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 { - { "ltc2309" }, + { "ltc2305", (kernel_ulong_t)<c2305_chip_info }, + { "ltc2309", (kernel_ulong_t)<c2309_chip_info }, { } }; MODULE_DEVICE_TABLE(i2c, ltc2309_id); --=20 2.34.1