From patchwork Fri Sep 20 17:33:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guillaume Stols X-Patchwork-Id: 13808676 Received: from mail-wr1-f48.google.com (mail-wr1-f48.google.com [209.85.221.48]) (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 7844718592D for ; Fri, 20 Sep 2024 17:33:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726853621; cv=none; b=HtvI/zNH9B+RT+IvCcZ/kArkyFFST3lPzoev1u827HWERgIQx6kZNVG2T0tf7racFXdC5g3MS3eSq+8s2F0WCtf2nNTeaxZ2gwNiSutW16/YKMlwh+pRGtcfXppwfijg8u7eSkeU9EbMua2WAsy5jeeM4SUkI094p7zUiLFbUJ0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726853621; c=relaxed/simple; bh=jH5AF1NUj11MGOXs+0oMMIR7SvlyPmokhbLME9mMNMs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=XSeeqdit80bZd85QiS1PcD7ONw5vySfrXua+2J03LG4K5K0pq8PLYJD6UCSX0WPbgJT94dV/Bd/BK65NUYZvhqQ4Qq1UjFnybuBRQaPbLRIrNXZxDf7K9C9fOhcuWrAtJKva8plHGtceZYV9RlflwvSS0U2ppSI8jSuTpe70/qI= 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=BIOrXG+r; arc=none smtp.client-ip=209.85.221.48 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="BIOrXG+r" Received: by mail-wr1-f48.google.com with SMTP id ffacd0b85a97d-374bb08d011so1238521f8f.3 for ; Fri, 20 Sep 2024 10:33:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1726853616; x=1727458416; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=nqbTxoEOJj+E0EusJXu3vOo7bySZpM0E+tGgQhd2Qeo=; b=BIOrXG+rj43PTDtF5s+7ZqEf+/6qZ3HmQoUZeQ0jFuq8PEtSzC8VI/ulrwfSYHDKUf 14iFj3+RFhTNas1qHu03RpWNtGKRF9KX0aGtcDWAsfqFTezhWVriczctcCVIGCRces2J aGvDo5I+z/D8MBaKNeLgBB8g+2fQJbuqvOF99ary92LlyX0bKAYb/TcjJL2xUwJAh+Om PYNW5drVNKSSoF1riQqLDYbaByoWbVPX3hVYM5v+3HFOG8Ctcfh2p9qlhlL7CKP/Ifm0 U6Ie8AvlJbn62W+q3AjlIswmyaPcaBTHNHf/g4HlJNHUxEsZMXk9TJ1ZBcAkb4M/dKSG Erhw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726853616; x=1727458416; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=nqbTxoEOJj+E0EusJXu3vOo7bySZpM0E+tGgQhd2Qeo=; b=EjD/Wx82WntGDXzESOEja/cQEvU5mvMRJsnSwMlcQaRNr7f5YoimP4hhf5eeFReM5R d4X+/FRnYU1V+I3J3/kZsYTS/FtiwktGBVjk6A2YatzUiDqmBca9cqCULp7Rrdrr3ro1 lWRBST/QcHp3y07vNzMiEcME8SE5A5z2CYBebNKYcxeE5YrweqSOF+pReW+7eCFMcpBC VbX9xGzW4LjEYLuspdH2YMBa2MluQXBzCtgl0A3C3SK1gB1t+d9ckTFV+dDXG0eJ1VLD 5Q3604Ia/3B1EA0wobpBktopLXUj2loGzgkoNwpUqQM+ElrCf8Ycx3NkzbbAHnl+5VgI C+yA== X-Forwarded-Encrypted: i=1; AJvYcCXPE+OkO8LO+82QtPsaZxi/mTQChmz/lWHvAO/oELWk2AkDiN+UgC+XiUIJ0SLFim1y4nsYtcQ/OQ03sw==@vger.kernel.org X-Gm-Message-State: AOJu0YzLS/nklWnAY2R/zdZx40shoIzSjQvbDSGSuq97RwajWfosD77b eRPMOC3YZTocjcLE1pzciNvaQzk/qnWM36a6vN24nNt+48S8W3OUlH5FnidApudQwVzOEu7UFL9 W X-Google-Smtp-Source: AGHT+IFiSJQD4Z15/Xdx8nq9M3r3mKqhBJoDnK88r8s3gsfWDbUgSbXnNSZwYOc4QDNcmGmgZR2b6g== X-Received: by 2002:a05:6000:88e:b0:374:c17a:55b5 with SMTP id ffacd0b85a97d-37a4226bb7bmr1929359f8f.14.1726853616033; Fri, 20 Sep 2024 10:33:36 -0700 (PDT) Received: from [127.0.1.1] (frhb82016ds.ikexpress.com. [185.246.87.17]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-378e780e029sm18111177f8f.116.2024.09.20.10.33.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Sep 2024 10:33:34 -0700 (PDT) From: Guillaume Stols Date: Fri, 20 Sep 2024 17:33:30 +0000 Subject: [PATCH v2 10/10] iio: adc: ad7606: Disable PWM usage for non backend version Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240920-ad7606_add_iio_backend_support-v2-10-0e78782ae7d0@baylibre.com> References: <20240920-ad7606_add_iio_backend_support-v2-0-0e78782ae7d0@baylibre.com> In-Reply-To: <20240920-ad7606_add_iio_backend_support-v2-0-0e78782ae7d0@baylibre.com> To: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , "Rafael J. Wysocki" , Jonathan Corbet , Michal Marek Cc: linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Hennerich , linux-fbdev@vger.kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, aardelean@baylibre.com, dlechner@baylibre.com, Guillaume Stols , jstephan@baylibre.com X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1726853604; l=1655; i=gstols@baylibre.com; s=20240417; h=from:subject:message-id; bh=jH5AF1NUj11MGOXs+0oMMIR7SvlyPmokhbLME9mMNMs=; b=kSnZJIrPGfSq6YzbLJZ9p9mO7w2NOsG/iZXur554ypRAWkxnTvW2tYn3jiMYak1kdPyCLhejb hUajOoIJbZlAmnbA5Lm007KmnnbAvokXAsLS7hGMF50KRMfdAOuPIXg X-Developer-Key: i=gstols@baylibre.com; a=ed25519; pk=XvMm5WHuV67sGYOJZqIYzXndbaJOlNd8Q6li6vnb4Cs= Since the pwm was introduced before backend, there was an example use whit triggered buffers. However, using it may be dangerous, because if the PWM goes too fast, a new conversion can be triggered before the transmission is over, whit the associated mess in the buffers. Until a solution is found to mitigate this risk, for instante CRC support, the PWM will be disabled. Signed-off-by: Guillaume Stols --- drivers/iio/adc/ad7606.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c index f710445bdc22..0c12ca237ee9 100644 --- a/drivers/iio/adc/ad7606.c +++ b/drivers/iio/adc/ad7606.c @@ -599,7 +599,6 @@ static int ad7606_buffer_postenable(struct iio_dev *indio_dev) struct ad7606_state *st = iio_priv(indio_dev); gpiod_set_value(st->gpio_convst, 1); - ad7606_pwm_set_swing(st); return 0; } @@ -609,7 +608,6 @@ static int ad7606_buffer_predisable(struct iio_dev *indio_dev) struct ad7606_state *st = iio_priv(indio_dev); gpiod_set_value(st->gpio_convst, 0); - ad7606_pwm_set_low(st); return 0; } @@ -838,6 +836,12 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address, indio_dev->setup_ops = &ad7606_pwm_buffer_ops; } else { init_completion(&st->completion); + + /* Reserve the PWM use only for backend (force gpio_convst definition) */ + if (!st->gpio_convst) + return dev_err_probe(dev, -EINVAL, + "No backend, connect convst to a GPIO"); + ret = devm_request_threaded_irq(dev, irq, NULL, &ad7606_interrupt,