The AD7606C-16 and AD7606C-18 are pretty similar with the AD7606B. The main difference between AD7606C-16 & AD7606C-18 is the precision in bits (16 vs 18). Because of that, some scales need to be defined for the 18-bit variants, as they need to be computed against 2**18 (vs 2**16 for the 16 bit-variants). Because the AD7606C-16,18 also supports bipolar & differential channels, for SW-mode, the default range of 10 V or ±10V should be set at probe. On reset, the default range (in the registers) is set to value 0x3 which corresponds to '±10 V single-ended range', regardless of bipolar or differential configuration. Aside from the scale/ranges, the AD7606C-16 is similar to the AD7606B. This changeset, does a bit of rework to the existing ad7606 driver and then adds support for the AD7606C-16 & AD7606C-18 parts. Datasheet links: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-16.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-18.pdf Changelog v5 -> v6: - v5: https://lore.kernel.org/linux-iio/20240907065043.771364-1-aardelean@xxxxxxxxxxxx/ - Dropped patch 'iio: adc: ad7606: remove frstdata check for serial mode' - It's part of iio/testing now - For patch 'iio: adc: ad7606: move 'val' pointer to ad7606_scan_direct()' - Added early return 'if (ret) goto error_ret' - Reworked patch 'iio: adc: ad7606: split a 'ad7606_sw_mode_setup()' from probe' to 'iio: adc: ad7606: move scale_setup as function pointer on chip-info' - Splitting 'ad7606_sw_mode_setup()' & 'ad7606_chan_scales_setup()' from probe - Added scale_setup_cb hook to chip_info table - For patch 'iio: adc: ad7606: add 'bits' parameter to channels macros' - Adjusted paragraph 'Up until now, all chips were 16 bit.' - Patch 'iio: adc: ad7606: wrap channel ranges & scales into struct' re-applied on new context - Patch 'iio: adc: ad7606: rework available attributes for SW channels' re-applied on new context - Patch 'dt-bindings: iio: adc: add docs for AD7606C-{16,18} parts' - Simplified 'bipolar' property ; it is now mandatory if channels node exists - If no channel node exists it's unipolar single-ended - Update descriptions to reflect this - For patch 'iio: adc: ad7606: add support for AD7606C-{16,18} parts' - In 'ad7606_spi_read_block18to32' change 'sizeof(uint32_t)' -> 'sizeof(u32)' - In ad7606.h changed d16/d32 -> buf16/buf32; and types to u16/u32 - Reworked channel setup logic Changelog v4 -> v5: - v4: https://lore.kernel.org/linux-iio/20240905082404.119022-1-aardelean@xxxxxxxxxxxx/ - Not all topics from v4 have been fully resolved; but I created a v5 in case it helps to spot other (new) topics - Added patch 'iio: adc: ad7606: remove frstdata check for serial mode' - This is from the 'fixes-togreg' branch - It should be ignored - Should help with a bit of context for this series - For patch 'iio: adc: ad7606: add 'bits' parameter to channels macros' - Added '.storagebits = (bits) > 16 ? 32 : 16' - Reduces the final patch a bit - i.e. 'iio: adc: ad7606: add support for AD7606C-{16,18} parts' - For patch 'iio: adc: ad7606: move 'val' pointer to ad7606_scan_direct() ' - Added 'Reviewed-by: David Lechner <dlechner@xxxxxxxxxxxx>' - For patch 'iio: adc: ad7606: rework available attributes for SW channels' - Added '.storagebits = (bits) > 16 ? 32 : 16' - Reduces the final patch a bit - i.e. 'iio: adc: ad7606: add support for AD7606C-{16,18} parts' - For patch 'dt-bindings: iio: adc: add docs for AD7606C-{16,18} parts' - Added '"^channel@[1-8]$": false' if not 'adi,sw-mode' - Added 'Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>' - Given the change, I would need confirmation that the Krzysztof's Reviewed-by tag is still valid - There is still an open topic about using 'oneOf:required:{diff-channels,bipolar}' vs 'if:required: [diff-channels]then:required: [bipolar]' - I'm leaning towards 'oneOf:required:{diff-channels,bipolar}' - Let's see what a discussio will yield - For patch 'iio: adc: ad7606: add support for AD7606C-{16,18} parts' - In 'ad7606_spi_read_block18to32()' fixed '.len = count * sizeof(uint32_t)' in 'struct spi_transfer xfer' - In 'ad7606_read_samples()' changed 'u16 *data = st->data;' to 'void *data = st->data.d16;' ; both would compile though ; converting 'data' to 'void *' may show that it's not just 16 bits - In ad7606c_18_chan_setup() & ad7606c_16_chan_setup() - Added explicit 'cs->reg_offset = 0;' - In 'ad7606c_sw_mode_setup_channels()' : - If pins are specified incorrectly, an error is triggered (vs ignoring it before) - Updated comment about why 'st->bops->sw_mode_config()' is called first Changelog v3 -> v4: - v3: https://lore.kernel.org/linux-iio/20240904072718.1143440-1-aardelean@xxxxxxxxxxxx/ - For patch 'dt-bindings: iio: adc: document diff-channels corner case for some ADCs' - Added 'Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>' - Renamed patch 'dt-bindings: iio: adc: add adi,ad7606c-{16,18} compatible strings' to 'dt-bindings: iio: adc: add docs for AD7606C-{16,18} parts' - Updated based on notes from Krzysztof Kozlowski (from v3) - Dropped () - Re-ordered the patternProperties:oneOf:required specification - Unified match-pattern to '^channel@[1-8]$' Changelog v2 -> v3: - v2: https://lore.kernel.org/linux-iio/20240902103638.686039-1-aardelean@xxxxxxxxxxxx/ - Applied checkpatch.pl changes - Managed to setup and run 'make dt_binding_check DT_SCHEMA_FILES=adi,ad7606.yaml' - Found the winning combination for this setup - David Lechner also helped - For patch 'iio: adc: ad7606: rework available attributes for SW channels' - Removed an extra space that checkpatch found - For patch 'dt-bindings: iio: adc: document diff-channels corner case for some ADCs' - Removed 'the the' stutter (that I did in writing) - For patch 'dt-bindings: iio: adc: add adi,ad7606c-{16,18} compatible strings' - Updated binding with some description for 'diff-channels' & 'bipolar' properties - Channel definitions are counted from 1 to 8 to match datasheet - Added more bindings rules for 'diff-channels' & 'bipolar' for AD7606C - Adapted some ideas from adi,ad7192.yaml - For patch 'iio: adc: ad7606: add support for AD7606C-{16,18} parts' - Updated 'diff-channels' property with channel numbers (from 1 to 8) handling Changelog v1 -> v2: - v1: https://lore.kernel.org/linux-iio/20240819064721.91494-1-aardelean@xxxxxxxxxxxx/ - Fixed description in 'iio: adc: ad7606: add 'bits' parameter to channels macros' - Added patch 'dt-bindings: iio: adc: document diff-channels corner case for some ADCs' - diff-channels = <reg reg> can be used to define differential channels with dedicated positive + negative pins - Re-worked patch 'dt-bindings: iio: adc: add adi,ad7606c-{16,18} compatible strings' - Using standard 'diff-channels' & 'bipolar' properties from adc.yaml - Re-worked patch 'iio: adc: ad7606: add support for AD7606C-{16,18} parts' - Reading 18-bit samples now relies on SPI controllers being able to pad 18-bits to 32-bits. - Implemented 'diff-channels = <reg reg>' setting - Removed some bad/left-over channel configuration code which I forgot during development and rebasing. Alexandru Ardelean (8): iio: adc: ad7606: add 'bits' parameter to channels macros iio: adc: ad7606: move 'val' pointer to ad7606_scan_direct() iio: adc: ad7606: move scale_setup as function pointer on chip-info iio: adc: ad7606: wrap channel ranges & scales into struct iio: adc: ad7606: rework available attributes for SW channels dt-bindings: iio: adc: document diff-channels corner case for some ADCs dt-bindings: iio: adc: add docs for AD7606C-{16,18} parts iio: adc: ad7606: add support for AD7606C-{16,18} parts .../devicetree/bindings/iio/adc/adc.yaml | 4 + .../bindings/iio/adc/adi,ad7606.yaml | 120 +++++ drivers/iio/adc/ad7606.c | 464 +++++++++++++++--- drivers/iio/adc/ad7606.h | 86 +++- drivers/iio/adc/ad7606_spi. | 0 drivers/iio/adc/ad7606_spi.c | 71 ++- 6 files changed, 653 insertions(+), 92 deletions(-) create mode 100644 drivers/iio/adc/ad7606_spi. -- 2.46.0
