iio: stx104: Add support for GPIO names

This patch sets the gpio_chip names option with an array of GPIO line
names that match the manual documentation for the Apex Embedded Systems
STX104. This should make it easier for users to identify which GPIO line
corresponds to a respective GPIO pin on the device.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/stx104.c b/drivers/iio/adc/stx104.c
index fcfad51cc4fba9cb9031b7f33031e0dff515c9df..40c05df218f8f556273e8ae1d8dc65f1e68f6d63 100644 (file)
--- a/drivers/iio/adc/stx104.c
+++ b/drivers/iio/adc/stx104.c
@@ -256,6 +256,11 @@ static void stx104_gpio_set(struct gpio_chip *chip, unsigned int offset,
        spin_unlock_irqrestore(&stx104gpio->lock, flags);
 }
 
+#define STX104_NGPIO 8
+static const char *stx104_names[STX104_NGPIO] = {
+       "DIN0", "DIN1", "DIN2", "DIN3", "DOUT0", "DOUT1", "DOUT2", "DOUT3"
+};
+
 static int stx104_probe(struct device *dev, unsigned int id)
 {
        struct iio_dev *indio_dev;
@@ -309,7 +314,8 @@ static int stx104_probe(struct device *dev, unsigned int id)
        stx104gpio->chip.parent = dev;
        stx104gpio->chip.owner = THIS_MODULE;
        stx104gpio->chip.base = -1;
-       stx104gpio->chip.ngpio = 8;
+       stx104gpio->chip.ngpio = STX104_NGPIO;
+       stx104gpio->chip.names = stx104_names;
        stx104gpio->chip.get_direction = stx104_gpio_get_direction;
        stx104gpio->chip.direction_input = stx104_gpio_direction_input;
        stx104gpio->chip.direction_output = stx104_gpio_direction_output;