From patchwork Mon Jun 3 16:22:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dumitru Ceclan via B4 Relay X-Patchwork-Id: 13683981 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4FBEE19F; Mon, 3 Jun 2024 16:23:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717431794; cv=none; b=A1Ozg98k1Dc+4iJL7QJV7DOOyehcE6kk/H8jafk+Nl2kx+0ZXROW6v16s8ups46dN1s7cwrb19qkobz85SLATxksIfnPLAujchacEnjCw/G7TGb1Ncry9pA8lbLV9gF6YL7EPd9SfoK7YrEdukHzfjsY4Qyqtzo7txWK6RxsLq0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717431794; c=relaxed/simple; bh=pnQ8bQV8mHAFSbmSnU7+atoImMrUL8Y0W7r0fD3jSvU=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=eBMfw/Re9kPOsxTdD/WaBcTng4QbT6H/lRlCuG+nt14fjFf2kaJ7QIVFl79ecpEwWs2iWC674EoLnisuJockFsDd3CWI0Px343jx7JWCBg5gXiHvGeP8FqzOtIqCkBZ0Xco+RpgBDD+DjL3+d/gvc8HZ834QuNDe3G9NflvSo9I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BnJSVz5i; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BnJSVz5i" Received: by smtp.kernel.org (Postfix) with ESMTPS id CC0E6C4AF09; Mon, 3 Jun 2024 16:23:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717431793; bh=pnQ8bQV8mHAFSbmSnU7+atoImMrUL8Y0W7r0fD3jSvU=; h=From:Subject:Date:To:Cc:Reply-To:From; b=BnJSVz5irI0kFbpZ5QfyFr1LVvyCPlCkfWgJCdFh5gHNBK8OA93QnaxzmYx2Fk+D6 uklCCW+Xh8kwxU741LUW95GkPX+kpX3UDjhOydgaO+LKJlXqTEC0WN35c+MkyOu5zm QsYZSlgO7UHygJDRzPqsN5v5t5latFIJBTVEuH5FCU7OA4dLUjs58yn8ePptgDnXFt WY+6PPNm2f58EBFibwXHvAX+purzgqn35FBILQ+0urM8EeCasaFiQKJqz+/TFpWkpk +0XH2fG5CWoZLzvvaCIQZJUHq1jNqyprQaEvczgt9z1YKzMkoCAhwDPE4xteCAgLYM 2flG5JbeLu0kQ== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7243C25B75; Mon, 3 Jun 2024 16:23:13 +0000 (UTC) From: Dumitru Ceclan via B4 Relay Subject: [PATCH v5 0/9] Add support for AD411x Date: Mon, 03 Jun 2024 19:22:58 +0300 Message-Id: <20240603-ad4111-v5-0-9a9c54d9ac78@analog.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAOLtXWYC/2XOTQrCMBCG4atI1kYyyaSxrryHuMjPtAa0kVaKU np3U8VacfkNeV4ysI7aSB3brQbWUh+7mJo89HrF/Mk2NfEY8mZSSBQKJLcBAYAbIqeQHFpdsfz 42lIV76/Q4Zj3KXa31D5e3R6m6zuBAj6JHrjgCgvY2tJ7LeTeNvac6o1PFzY1evl1GnB2MjtZO iqs1lQ5/efUwkkzO5WdoZJCcC4ocn8OF059/4nZFVgIowR4oc2PG8fxCcpBcHxFAQAA To: Ceclan Dumitru Cc: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , David Lechner , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Dumitru Ceclan , Jonathan Cameron , Nuno Sa X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1717431792; l=11344; i=dumitru.ceclan@analog.com; s=20240313; h=from:subject:message-id; bh=pnQ8bQV8mHAFSbmSnU7+atoImMrUL8Y0W7r0fD3jSvU=; b=CV/2Az6ToqKFUXmunbIaFGNHHc2RNHX75ZV/ULoAZYSNWc4hcBhxJ0gOaKI4K3889mUvRoCdw tqVwWSitRvlBlm35cku9rlK9WWCkpD64q9dbhPg96lgHUukDK5stHyU X-Developer-Key: i=dumitru.ceclan@analog.com; a=ed25519; pk=HdqMlVyrcazwoiai7oN6ghU+Bj1pusGUFRl30jhS7Bo= X-Endpoint-Received: by B4 Relay for dumitru.ceclan@analog.com/20240313 with auth_id=140 X-Original-From: Dumitru Ceclan Reply-To: dumitru.ceclan@analog.com This patch series adds support for the Analog Devices AD4111, AD4112, AD4114, AD4115, AD4116 within the existing AD7173 driver. The AD411X family encompasses a series of low power, low noise, 24-bit, sigma-delta analog-to-digital converters that offer a versatile range of specifications. They integrate an analog front end suitable for processing fully differential/single-ended and bipolar voltage inputs. Particularities of the models: - All ADCs have inputs with a precision voltage divider with a division ratio of 10. - AD4116 has 5 low level inputs without a voltage divider. - AD4111 and AD4112 support current inputs (0 mA to 20 mA) using a 50ohm shunt resistor. Discussions from this patch series have concluded with: -Datasheets mention single-ended and pseudo differential capabilities by the means of connecting the negative input of a differential pair (IN-) to a constant voltage supply and letting the positive input fluctuate. This is not a special operating mode, it is a capability of the differential channels to also measure such signals. -Single-ended and pseudo differential do not need any specific configuration and cannot be differentiated from differential usage by the driver side => offer adi,channel-type attribute to flag the usage of the channel -VINCOM is described as a dedicated pin for single-ended channels but as seen in AD4116, it is a normal input connected to the cross-point multiplexer (VIN10, VINCOM (single-ended or differential pair)). This does not mean full functionality in any configuration: AD4111:"If any two voltage inputs are paired in a configuration other than what is described in this data sheet, the accuracy of the device cannot be guaranteed". -ADCIN15 input pin from AD4116 is specified as the dedicated pin for pseudo-differential but from the datasheet it results that this pin is also able to measure single-ended and fully differential channels ("ADCIN11, ADCIN15. (pseudo differential or differential pair)"; "An example is to connect the ADCIN15 pin externally to the AVSS pin in a single-ended configuration") As such, detecting the type of usage of a channel is not possible and will be the responsibility of the user to specify. If the user has connected a non 0V (in regards to AVSS) supply to the negative input pin of a channel in a pseudo differential configuration, the offset of the measurement from AVSS will not be known from the driver and will need to be measured by other means. Datasheets: https://www.analog.com/media/en/technical-documentation/data-sheets/AD4111.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/AD4112.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/AD4114.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/AD4115.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/AD4116.pdf This series depends on patches: (iio: adc: ad7173: Use device_for_each_child_node_scoped() to simplify error paths.) https://lore.kernel.org/all/20240330190849.1321065-6-jic23@kernel.org (dt-bindings: iio: adc: Add single-channel property) https://lore.kernel.org/linux-iio/20240514120222.56488-5-alisa.roman@analog.com/ And patch series: (AD7173 fixes) https://lore.kernel.org/all/20240521-ad7173-fixes-v1-0-8161cc7f3ad1@analog.com/ Signed-off-by: Dumitru Ceclan --- Changes in v5: dt-bindings: iio: adc: Add common-mode-channel property - create patch dt-bindings: adc: ad7173: add support for ad411x - remove "adi" from common-mode-channel property iio: adc: ad_sigma_delta: add disable_one callback - create patch iio: adc: ad7173: refactor channel configuration parsing iio: adc: ad7173: refactor ain and vref selection - change function header to send ain[0] and ain[1] as two arguments - drop loop - drop reviewed-by tag iio: adc: ad7173: add support for special inputs - unroll the loop in the ain validation function - drop reviewed-by tag iio: adc: ad7173: refactor device info structs iio: adc: ad7173: document sampling frequency behaviour - create patch iio: adc: ad7173: Add support for AD411x devices - rename VINCOM define from wildcard to specific models - sampling frequency comment: "to" -> "for" - don't set ain[1] for a second time in channel_parse, set chan->channel2 value directly if the channel is a current channel - revert white space change in channel config parse - unroll the loop in the ain validation function - use new common-mode-channel property name - remove sampling frequency comment as included in a previous patch - Link to v4: https://lore.kernel.org/r/20240531-ad4111-v4-0-64607301c057@analog.com Changes in v4: dt-bindings: adc: ad7173: add support for ad411x - remove "adi,channel-type" - add "adi,common-mode-input" and "adi,current-channel" to use single-channel with both single-ended/pseudo-differential and current channels - add restrictions to patternProperties channel to restrict presence of both diff-channels and single-channel and both "adi,current-channel" and "adi,common-mode-input" - update diff-channels description - update commit message to current state of the binding - add a second example to exemplify single-ended and current channels iio: adc: ad7173: refactor channel configuration parsing - picked up reviewed-by tag iio: adc: ad7173: refactor ain and vref selection - Moved reference error message from validate_reference() to ad7173_get_ref_voltage_milli() - Changed from dev_err_probe to dev_err as function can be reached from non probe paths - added AD7173_NO_AINS_PER_CHANNEL to remove ambiguity when using the size of the ain array iio: adc: ad7173: add support for special inputs - picked up reviewed-by tag iio: adc: ad7173: refactor device info structs - create patch iio: adc: ad7173: Add support for AD411x devices - separate chip id defines for ad411<1,2,4> - fix device_info typos: voltage, VINCOM - rename num_voltage_inputs and num_voltage_inputs_with_divider to *_voltage_in* - subtract ch->cfg.bipolar directly - change to const ain argument in *_validate_current_ain() - change parsing to new dt structure for current and single-ended channels - drop adi,channel-type - refactor device info structs as the previous patch iio: adc: ad7173: Reduce device info struct size - remove patch as suggested by David Lechner as it would increase binary size more than the savings done in RAM - Link to v3: https://lore.kernel.org/r/20240527-ad4111-v3-0-7e9eddbbd3eb@analog.com Changes in v3: iio: adc: ad7173: fix buffers enablement for ad7176-2 iio: adc: ad7173: Add ad7173_device_info names iio: adc: ad7173: Remove index from temp channel - Remove patches, send in separate series dt-bindings: adc: ad7173: add support for ad411x - fix VINCOM typo - switch current channel definition to use single-channel - remove pseudo-differential from adi,channel-type, specify that single-ended will be used for that case as well - remove diff-channels from required, already defined in adc.yaml - update constraints to not permit single-channel for models without current inputs iio: adc: ad7173: refactor channel configuration parsing - remove blank line from commit message iio: adc: ad7173: refactor ain and vref selection - remove blank space from commit message iio: adc: ad7173: add support for special inputs iio: adc: ad7173: Add support for AD411x devices - remove pseudo diff channel type - change current channels dt parsing to single-channel - change module description from wild-card to "and similar" - add comment to document HW behavior when multiple channels are enabled in buffered reading mode iio: adc: ad7173: Reduce device info struct size - Link to v2: https://lore.kernel.org/r/20240514-ad4111-v2-0-29be6a55efb5@analog.com Changes in v2: dt-bindings: adc: ad7173: add support for ad411x - Add constraint for missing avdd2-supply on ad411x - Change support for current channels to selecting the actual diff-channels input values and activating the adi,current-channel property - Add constraint for adi,current-channel - Add adi,channel-type to be able to differentiante in the driver between single-ended, pseudo-differential and differential channels. - Update diff-channels description to decribe inputs beside the AINs iio: adc: ad7173: fix buffers enablement for ad7176-2 - Specify ".has_input_buf = false" for AD7176-2 - Drop fixes tag, specify that configuration bits are read only iio: adc: ad7173: refactor channel configuration parsing - Add Link and Suggested-by in commit message iio: adc: ad7173: refactor ain and vref selection - Improve commit message to express commit purpose - Refactor line wrappings due to reduced indent - Change AINs check to a loop iio: adc: ad7173: add support for special inputs - Create patch iio: adc: ad7173: Add ad7173_device_info names - Create patch iio: adc: ad7173: Remove index from temp channel - Justify in commit message userspace breakage - Remove index from the correct channel template iio: adc: ad7173: Add support for AD411x devices - Add missing validation for VCOM and inputs with voltage divider - Add missing validation for AD4116 low level inputs - Add missing ad7173_device_info names - Add support for setting differential flag depending on the channel type - Change current channel validation to use actual pin values - Combine multiple chipID reg values in a single define (AD7173_AD4111_AD4112_AD4114_ID) - Rename num_inputs and num_inputs_with_divider to include voltage - Add comment to specify that num_voltage_inputs_with_divider does not include the VCOM pin. - Change break to direct returns where possible in switch cases - Add fix for ad411x gpio's iio: adc: ad7173: Reduce device info struct size - Create patch - Link to v1: https://lore.kernel.org/r/20240401-ad4111-v1-0-34618a9cc502@analog.com --- Dumitru Ceclan (9): dt-bindings: iio: adc: Add common-mode-channel property dt-bindings: adc: ad7173: add support for ad411x iio: adc: ad_sigma_delta: add disable_one callback iio: adc: ad7173: refactor channel configuration parsing iio: adc: ad7173: refactor ain and vref selection iio: adc: ad7173: add support for special inputs iio: adc: ad7173: refactor device info structs iio: adc: ad7173: document sampling frequency behaviour iio: adc: ad7173: Add support for AD411x devices Documentation/devicetree/bindings/iio/adc/adc.yaml | 11 + .../devicetree/bindings/iio/adc/adi,ad7173.yaml | 191 +++++- drivers/iio/adc/ad7124.c | 14 +- drivers/iio/adc/ad7173.c | 694 +++++++++++++++------ drivers/iio/adc/ad_sigma_delta.c | 6 + include/linux/iio/adc/ad_sigma_delta.h | 14 + 6 files changed, 736 insertions(+), 194 deletions(-) --- base-commit: 02b664413a44903ef349bb70a3f1842cbcee9616 change-id: 20240312-ad4111-7eeb34eb4a5f Best regards,