linux-kernel - [PATCH v2 2/5] iio: adc: stm32: add dt option to set default trigger polarity

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Date:   Mon, 30 Jan 2017 15:33:57 +0100
From:   Fabrice Gasnier <fabrice.gasnier@...com>
To:     <jic23@...nel.org>, <linux@...linux.org.uk>, <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <linux-iio@...r.kernel.org>, <mark.rutland@....com>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>,
        <lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net>,
        <fabrice.gasnier@...com>, <benjamin.gaignard@...aro.org>,
        <benjamin.gaignard@...com>
Subject: [PATCH v2 2/5] iio: adc: stm32: add dt option to set default trigger polarity

STM32 ADC trigger polarity can be set to either rising, falling
or both edges. Add dt option to configure it.
Note: default value may be overridden later via trigger_polarity
sysfs attribute.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
---
 drivers/iio/adc/stm32-adc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index 9b49a6ad..be0e457 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -997,6 +997,13 @@ static int stm32_adc_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	of_property_read_u32(pdev->dev.of_node, "st,trigger-polarity",
+			     &adc->trigger_polarity);
+	if (adc->trigger_polarity >= ARRAY_SIZE(stm32_trig_pol_items)) {
+		dev_err(&pdev->dev, "Invalid st,trigger-polarity property\n");
+		return -EINVAL;
+	}
+
 	adc->irq = platform_get_irq(pdev, 0);
 	if (adc->irq < 0) {
 		dev_err(&pdev->dev, "failed to get irq\n");
-- 
1.9.1