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Fri, 05 Dec 2025 12:28:11 -0800 (PST) Received: from Lewboski.localdomain ([181.191.143.42]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29dae99fa59sm57256845ad.58.2025.12.05.12.28.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Dec 2025 12:28:11 -0800 (PST) From: Tomas Borquez To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman Cc: David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev, Tomas Borquez Subject: [RFC PATCH 0/3] ad9832: driver cleanup Date: Fri, 5 Dec 2025 17:27:40 -0300 Message-ID: <20251205202743.10530-1-tomasborquez13@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series is a general cleanup of ad9832, with the purpose of graduating it from staging. The main changes are removing legacy platform_data support, converting to IIO channels with read/write_raw callbacks, and adding devicetree support. I'm sending this as an RFC because I have some concerns about the ABI design and would appreciate guidance before putting more time into this. Patch 1 removes the legacy platform_data support as suggested by Jonathan [1]. The driver now initializes to a safe state and lets userspace configure frequencies/phases via sysfs. Patch 2 converts frequency and phase configuration from custom sysfs attributes to proper IIO channels using read_raw/write_raw callbacks (This is the main area where I'd like feedback). Patch 3 adds devicetree bindings documentation. Design Concerns: 1) Channel Organization and ABI Break The device has 2 frequency registers and 4 phase registers. Since both frequency and phase must use IIO_ALTVOLTAGE since there's no better fit (as far as I know), I've organized channels as: out_altvoltage0_frequency (FREQ0) out_altvoltage1_frequency (FREQ1) out_altvoltage2_phase (PHASE0) out_altvoltage3_phase (PHASE1) out_altvoltage4_phase (PHASE2) out_altvoltage5_phase (PHASE3) The old ABI used out_altvoltage0_frequency0, out_altvoltage0_frequency1, out_altvoltage0_phase0, etc. The new approach felt cleaner but I'm open to alternatives and better ways of mapping them. Is this channel mapping reasonable, or would a different organization be preferred? And is the ABI break okay? 2) Scale Attributes The frequency scale is 1 Hz and phase scale is 2*PI/4096 radians. I cannot use info_mask_shared_by_type for IIO_CHAN_INFO_SCALE because all channels share IIO_ALTVOLTAGE. So instead I'm using IIO_CONST_ATTR for the scales: out_altvoltage_frequency_scale = "1" out_altvoltage_phase_scale = "0.0015339808" Is there a better approach here? Or should I just document the units and skip scale attributes entirely? 3) Remaining Custom Attributes Other controls remain as custom sysfs attributes: - out_altvoltage_frequencysymbol: select active frequency register - out_altvoltage_phasesymbol: select active phase register - out_altvoltage_pincontrol_en: hardware pin control enable - out_altvoltage_out_enable: output enable I'm not sure if these map cleanly to IIO interfaces. Should these be documented in ABI or is there a preferred way to handle them? 4) Implementation Notes - read_raw uses explicit address switching rather than channel index arithmetic for clarity, though phase values could alternatively be accessed via st->phase[chan->channel - 2] and directly in freq with st->freq[chan->channel]. - I'm unsure if mutex guards on cached reads are necessary. Link: https://lore.kernel.org/linux-iio/20250628161040.3d21e2c4@jic23-huawei/ [1] Signed-off-by: Tomas Borquez Tomas Borquez (3): staging: iio: ad9832: remove platform_data support staging: iio: ad9832: convert to iio channels dt-bindings: iio: add analog devices ad9832/ad9835 .../bindings/iio/frequency/adi,ad9832.yaml | 65 +++++ drivers/staging/iio/frequency/ad9832.c | 264 +++++++++++------- drivers/staging/iio/frequency/ad9832.h | 33 --- 3 files changed, 233 insertions(+), 129 deletions(-) create mode 100644 Documentation/devicetree/bindings/iio/frequency/adi,ad9832.yaml delete mode 100644 drivers/staging/iio/frequency/ad9832.h -- 2.43.0