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-rw-r--r--include/linux/gpio/driver.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 1827b43966d..573e4f3243d 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -51,7 +51,10 @@ struct seq_file;
* format specifier for an unsigned int. It is substituted by the actual
* number of the gpio.
* @can_sleep: flag must be set iff get()/set() methods sleep, as they
- * must while accessing GPIO expander chips over I2C or SPI
+ * must while accessing GPIO expander chips over I2C or SPI. This
+ * implies that if the chip supports IRQs, these IRQs need to be threaded
+ * as the chip access may sleep when e.g. reading out the IRQ status
+ * registers.
* @exported: flags if the gpiochip is exported for use from sysfs. Private.
*
* A gpio_chip can help platforms abstract various sources of GPIOs so