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From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Jonathan Cameron <jic23@kernel.org>,
	Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>
Cc: <devicetree@vger.kernel.org>,
	linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH v3 2/8] iio: adc: max1027: Make it optional to use interrupts
Date: Mon,  7 Oct 2019 15:26:51 +0200	[thread overview]
Message-ID: <20191007132657.4190-3-miquel.raynal@bootlin.com> (raw)
In-Reply-To: <20191007132657.4190-1-miquel.raynal@bootlin.com>

The chip has a 'start conversion' and a 'end of conversion' pair of
pins. They can be used but this is absolutely not mandatory as regular
polling of the value is totally fine with the current internal
clocking setup. Turn the interrupts optional and do not error out if
they are not inquired in the device tree. This has the effect to
prevent triggered buffers use though.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/iio/adc/max1027.c | 57 +++++++++++++++++++++------------------
 1 file changed, 31 insertions(+), 26 deletions(-)

diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index 6cdfe9ef73fc..823223b77a70 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -430,35 +430,40 @@ static int max1027_probe(struct spi_device *spi)
 		return -ENOMEM;
 	}
 
-	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
-					&iio_pollfunc_store_time,
-					&max1027_trigger_handler, NULL);
-	if (ret < 0) {
-		dev_err(&indio_dev->dev, "Failed to setup buffer\n");
-		return ret;
-	}
+	if (spi->irq) {
+		ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
+						      &iio_pollfunc_store_time,
+						      &max1027_trigger_handler,
+						      NULL);
+		if (ret < 0) {
+			dev_err(&indio_dev->dev, "Failed to setup buffer\n");
+			return ret;
+		}
 
-	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
-							indio_dev->name);
-	if (st->trig == NULL) {
-		ret = -ENOMEM;
-		dev_err(&indio_dev->dev, "Failed to allocate iio trigger\n");
-		return ret;
-	}
+		st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
+						  indio_dev->name);
+		if (st->trig == NULL) {
+			ret = -ENOMEM;
+			dev_err(&indio_dev->dev,
+				"Failed to allocate iio trigger\n");
+			return ret;
+		}
 
-	st->trig->ops = &max1027_trigger_ops;
-	st->trig->dev.parent = &spi->dev;
-	iio_trigger_set_drvdata(st->trig, indio_dev);
-	iio_trigger_register(st->trig);
+		st->trig->ops = &max1027_trigger_ops;
+		st->trig->dev.parent = &spi->dev;
+		iio_trigger_set_drvdata(st->trig, indio_dev);
+		iio_trigger_register(st->trig);
 
-	ret = devm_request_threaded_irq(&spi->dev, spi->irq,
-					iio_trigger_generic_data_rdy_poll,
-					NULL,
-					IRQF_TRIGGER_FALLING,
-					spi->dev.driver->name, st->trig);
-	if (ret < 0) {
-		dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
-		return ret;
+		ret = devm_request_threaded_irq(&spi->dev, spi->irq,
+						iio_trigger_generic_data_rdy_poll,
+						NULL,
+						IRQF_TRIGGER_FALLING,
+						spi->dev.driver->name,
+						st->trig);
+		if (ret < 0) {
+			dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
+			return ret;
+		}
 	}
 
 	/* Disable averaging */
-- 
2.20.1


  parent reply	other threads:[~2019-10-07 13:27 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-07 13:26 [PATCH v3 0/8] Introduce max12xx ADC support Miquel Raynal
2019-10-07 13:26 ` [PATCH v3 1/8] iio: adc: max1027: Add debugfs register read support Miquel Raynal
2019-10-07 13:26 ` Miquel Raynal [this message]
2019-10-07 13:26 ` [PATCH v3 3/8] iio: adc: max1027: Reset the device at probe time Miquel Raynal
2019-10-07 13:26 ` [PATCH v3 4/8] iio: adc: max1027: Prepare the introduction of different resolutions Miquel Raynal
2019-10-07 13:26 ` [PATCH v3 5/8] iio: adc: max1027: Introduce 12-bit devices support Miquel Raynal
2019-10-07 13:26 ` [PATCH v3 6/8] dt-bindings: iio: adc: max1027: Mark interrupts as optional Miquel Raynal
2019-10-07 13:26 ` [PATCH v3 7/8] dt-bindings: Add 1027/1029/1031 SPI ADCs as trivial devices Miquel Raynal
2019-10-07 13:26 ` [PATCH v3 8/8] dt-bindings: Add max12xx SPI ADC series " Miquel Raynal
2019-10-10 20:47   ` Rob Herring
2019-10-10 21:31     ` Miquel Raynal

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