From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f50.google.com (mail-ot1-f50.google.com [209.85.210.50]) (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 1BAEF28373 for ; Wed, 16 Apr 2025 19:23:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.50 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744831396; cv=none; b=fNQa/GLwgKKvJt5TGOFR6VSeycUqXrZ5jdwXtbhHsDBaCDco4DMTtcpvZT5jANJkaf8cCz5a+xiKO/z6TAZTZ2UyKtJ5bdk7f/SXU9qrUbjC4EwDSEdLY26VJOJ/D/zDbSM1u4uYrJ/w8zgVG7mcKvbbCxsPpO4enCRyAtImO64= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744831396; c=relaxed/simple; bh=n6HiIgF4wrJtBV7F514mTUclegysW2D8sxy0uun1FX8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=PGgDBp5krVP/QG8ESTcq4nu6Mxj3R8myenobEAdmUeAEO+gDzYJbHQgrXryNX129/mBc3kS0qkjW7srh9GFKJlE9tJYczLgoKtXaH6Ni5rW3ne7kpwfSulRvz3keKM1HliXqYPNcQkyKkRxLZ3BltJ0h72r8q9RLqdbsX0vqXhw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com; spf=pass smtp.mailfrom=baylibre.com; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b=y4DORVsb; arc=none smtp.client-ip=209.85.210.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=baylibre.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b="y4DORVsb" Received: by mail-ot1-f50.google.com with SMTP id 46e09a7af769-72c7336ed99so2265347a34.0 for ; Wed, 16 Apr 2025 12:23:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1744831393; x=1745436193; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:content-language:from :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=vS5xUACcNCCrBpVNgHTyKpBRi3GuyJnUtbCmTpMSgjo=; b=y4DORVsbGxzB+9HYKmO4nebLhOFxxK735baofKE6wiCSXo4UAnftk5pZ1pDQIswYje Qq8Ux0ybMM7wjVP7ZT0QuKpcrvJXmcACYdi5Fr2W/z2zkCPHXxOivdX7Tar1Es9SlqwS xetxJvupLzVRUY0De+lY8MKHwBqhW0UOmwtzUN97OEmx9QOkQG+Ewre0SbbMuIB+xKMF 0TlAOXv8Iqbz2dOyfhmzAVFjOxR2H7E8Jok+tAli7ZjAG8E5c2Sdd/wB5fnxzBC2z6Me T0OCVXo2ep4w3e72G+ra+oqxWKUsdbsYcimbkQpNgTsQHOPaZIUNgczIU0FCLVoa2Jbk pPSw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744831393; x=1745436193; h=content-transfer-encoding:in-reply-to:content-language:from :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=vS5xUACcNCCrBpVNgHTyKpBRi3GuyJnUtbCmTpMSgjo=; b=XndwVMai4aBO3+Er9oPw/YQ1yDKGI6woKiHnb5DUhz9i3IHL6HJHWnC8fncGXnAGGG 3oTdqdWim8cldU6q5eEicQmpxwuRoMLxMqYEybcI1bGwE5MlwqmYCf74Lm9FRkUIkTeQ peKC/9TDKHSWno5xfqG46nzrUvHZJ0RMEortw30ReHcLnzE2l2eQe5LA/G3C1Syi7lja kc+tFSFvPcF0NTWPmCCKdHWg/LALM6DdYoYzpryHye5ees/bPCdVaSLVWO6Md1udItAh 3iF91Fw6bUHxWHCr9fy9EdPxz8mjUPipifp4ytsrSlsK2QHUx5Q8J09u8fmMEqh07kT4 BsBg== X-Forwarded-Encrypted: i=1; AJvYcCW7DClSnfQOzsYwitQnn42lz2tSllbQYOT63AhdFIeTHh3GqaJwYEfGK7anmOR5cUNTYxB7+V8dO8eI@vger.kernel.org X-Gm-Message-State: AOJu0YzYInkVXwwh+kIZJsh4WB9doFNGEsxOJw0LJD8YcsOdFQSryID4 silHBRY+ZYSW7ugym01c52AhUzMH9qf0tI4p3gy2GBZUYmtzKRfbbQG5JSnAwys= X-Gm-Gg: ASbGnctG0oUYHSciGMyexPjx85kQv+pMg/gFE5sHTJwT8sfsfSdEHu0lobRozYFMi3K brbkiiHbp3a2cAgXr+fPs3gy98D7zx+ZZAOXzyePEdr/V4yiZhaWsQDNqPOfjL0DdKDYCxkZjiT QBdn9RDN9TM0kJZcTsZMweq+PO/V8w50lEUSz2BUE1Tno+4LuXqzIAGq4dggJ0qpEEJmMAu+kTv VxhBKFEsYnvHuq9TCnXMRUnRyU0m+6WW+UJ5AGYCfwFHLU+SOlTYb3UCod6CtP07y5eA+cBr6Az AbnDgMLCPzA9qYdCSNg8yNw0m61wHZmykDLkmeQNgicHO0yvW7k4AgYiVMh/hz91lbi9GhLJR42 gGrBYiJeINnh6sdd25w== X-Google-Smtp-Source: AGHT+IEshEuTpaRy2hRNUwgWJpOdGegeC8MYC6hqw3ipqrtukkPUoJAPGJ2kj6WGEl4JAoEPRqdOFA== X-Received: by 2002:a05:6830:b94:b0:72b:9724:6a82 with SMTP id 46e09a7af769-72ec6cdfe8cmr1972036a34.17.1744831393135; Wed, 16 Apr 2025 12:23:13 -0700 (PDT) Received: from ?IPV6:2600:8803:e7e4:1d00:58f0:670c:6b15:7fd3? ([2600:8803:e7e4:1d00:58f0:670c:6b15:7fd3]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-604a5bce487sm482389eaf.24.2025.04.16.12.23.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 16 Apr 2025 12:23:12 -0700 (PDT) Message-ID: Date: Wed, 16 Apr 2025 14:23:11 -0500 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/3] iio: dac: ad3530r: Add driver for AD3530R and AD3531R To: Kim Seer Paller , Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?UTF-8?Q?Nuno_S=C3=A1?= Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20250412-togreg-v4-0-cb9e5309b99d@analog.com> <20250412-togreg-v4-3-cb9e5309b99d@analog.com> From: David Lechner Content-Language: en-US In-Reply-To: <20250412-togreg-v4-3-cb9e5309b99d@analog.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 4/12/25 12:57 AM, Kim Seer Paller wrote: > The AD3530/AD3530R (8-channel) and AD3531/AD3531R (4-channel) are > low-power, 16-bit, buffered voltage output DACs with software- > programmable gain controls, providing full-scale output spans of 2.5V or > 5V for reference voltages of 2.5V. These devices operate from a single > 2.7V to 5.5V supply and are guaranteed monotonic by design. The "R" > variants include a 2.5V, 5ppm/°C internal reference, which is disabled > by default. > > Support for monitoring internal die temperature, output voltages, and > current of a selected channel via the MUXOUT pin using an external ADC > is currently not implemented. > > Signed-off-by: Kim Seer Paller > --- Looks very good now. :-) A made a few comments but maybe nothing serious enough to require a v5. > diff --git a/drivers/iio/dac/ad3530r.c b/drivers/iio/dac/ad3530r.c > new file mode 100644 > index 0000000000000000000000000000000000000000..ffa04f678b86d8da6f5e47c35c265b6648121843 > --- /dev/null > +++ b/drivers/iio/dac/ad3530r.c > @@ -0,0 +1,506 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * AD3530R/AD3530 8-channel, 16-bit Voltage Output DAC Driver > + * AD3531R/AD3531 4-channel, 16-bit Voltage Output DAC Driver > + * > + * Copyright 2025 Analog Devices Inc. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include Usually, we try to avoid including kernel.h - it includes too much. > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + ... > + > +static int ad3530r_setup(struct ad3530r_state *st, int vref, > + bool has_external_vref) > +{ > + struct device *dev = regmap_get_device(st->regmap); > + struct gpio_desc *reset_gpio; > + int i, ret; > + bool has_range_multiplier; > + > + reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); > + if (IS_ERR(reset_gpio)) > + return dev_err_probe(dev, PTR_ERR(reset_gpio), > + "Failed to get reset GPIO\n"); > + > + if (reset_gpio) { > + /* Perform hardware reset */ > + fsleep(1000); > + gpiod_set_value_cansleep(reset_gpio, 0); > + } else { > + /* Perform software reset */ > + ret = regmap_update_bits(st->regmap, AD3530R_INTERFACE_CONFIG_A, > + AD3530R_SW_RESET, AD3530R_SW_RESET); > + if (ret) > + return ret; > + } > + > + fsleep(10000); > + > + has_range_multiplier = false; > + if (device_property_present(dev, "adi,range-double")) { Since this is a flag, I think device_property_read_bool() is preferred. > + ret = regmap_set_bits(st->regmap, AD3530R_OUTPUT_CONTROL_0, > + AD3530R_OUTPUT_CONTROL_RANGE); > + if (ret) > + return ret; > + > + has_range_multiplier = true; > + } > + > + if (!has_external_vref && st->chip_info->internal_ref_support) { > + ret = regmap_set_bits(st->regmap, AD3530R_REFERENCE_CONTROL_0, > + AD3530R_REFERENCE_CONTROL_SEL); > + if (ret) > + return ret; > + > + st->vref_mv = has_range_multiplier ? > + 2 * AD3530R_INTERNAL_VREF_MV : > + AD3530R_INTERNAL_VREF_MV; > + } > + > + if (has_external_vref) > + st->vref_mv = has_range_multiplier ? 2 * vref / 1000 : vref / 1000; > + I think this would be simpler as: st->vref_mv = range_multiplier * vref / 1000; where range_multiplier is 1 or 2. > + /* Set operating mode to normal operation. */ > + ret = regmap_write(st->regmap, AD3530R_OUTPUT_OPERATING_MODE_0, > + AD3530R_NORMAL_OPERATION); > + if (ret) > + return ret; > + > + if (st->chip_info->num_channels > AD3531R_MAX_CHANNELS) { > + ret = regmap_write(st->regmap, AD3530R_OUTPUT_OPERATING_MODE_1, > + AD3530R_NORMAL_OPERATION); > + if (ret) > + return ret; > + } > + > + for (i = 0; i < st->chip_info->num_channels; i++) > + st->chan[i].powerdown_mode = AD3530R_POWERDOWN_32K; > + > + st->ldac_gpio = devm_gpiod_get_optional(dev, "ldac", GPIOD_OUT_HIGH); I guess it doesn't matter which state this starts in but GPIOD_OUT_LOW seems more natural since we toggle it high the low later. > + if (IS_ERR(st->ldac_gpio)) > + return dev_err_probe(dev, PTR_ERR(st->ldac_gpio), > + "Failed to get ldac GPIO\n"); > + > + return 0; > +} > +