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at86rf230: add warning if edge-triggered irq

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While testing I experience a deadlock while using the at86rf233 on a
raspberry pi. The reason was an edge triggered gpio irq because the irq
triggered while irq was disabled. This issue doesn't happend on a level
triggered irq because the irq will hit after calling enable_irq.

This patch adds a warning that it's not recommended to use a edge-triggered
irq type. Also change the examples to high-level irqtype.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2015-02-27 09:58:30 +01:00 committed by Marcel Holtmann
parent 702d211c45
commit c91799c50a
2 changed files with 7 additions and 2 deletions
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5
Documentation/devicetree/bindings/net/ieee802154/at86rf230.txt
View File

@ -6,7 +6,8 @@ Required properties:
- spi-max-frequency: maximal bus speed, should be set to 7500000 depends
sync or async operation mode
- reg: the chipselect index
- interrupts: the interrupt generated by the device
- interrupts: the interrupt generated by the device. Non high-level
can occur deadlocks while handling isr.
Optional properties:
- reset-gpio: GPIO spec for the rstn pin
@ -20,7 +21,7 @@ Example:
compatible = "atmel,at86rf231";
spi-max-frequency = <7500000>;
reg = <0>;
interrupts = <19 1>;
interrupts = <19 4>;
interrupt-parent = <&gpio3>;
xtal-trim = /bits/ 8 <0x06>;
};

4
drivers/net/ieee802154/at86rf230.c
View File

@ -1321,6 +1321,10 @@ static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
return rc;
irq_type = irq_get_trigger_type(lp->spi->irq);
if (irq_type == IRQ_TYPE_EDGE_RISING ||
irq_type == IRQ_TYPE_EDGE_FALLING)
dev_warn(&lp->spi->dev,
"Using edge triggered irq's are not recommended!\n");
if (irq_type == IRQ_TYPE_EDGE_FALLING ||
irq_type == IRQ_TYPE_LEVEL_LOW)
irq_pol = IRQ_ACTIVE_LOW;