Am Samstag, den 07.06.2014, 14:56 -0700 schrieb Steve Longerbeam:
[...]
> static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
> @@ -735,6 +741,26 @@ static int pca953x_probe(struct i2c_client *client,
> /* If I2C node has no interrupts property, disable GPIO
> interrupts */
> if (of_find_property(client->dev.of_node, "interrupts", NULL)
> == NULL)
> irq_base = -1;
> +
> + /* see if we need to de-assert a reset pin */
> + ret = of_get_named_gpio_flags(client->dev.of_node,
> + "reset-gpios", 0,
> + &chip->reset_gpio_flags);
> + if (gpio_is_valid(ret)) {
> + chip->reset_gpio = ret;
> + ret = devm_gpio_request_one(&client->dev,
> + chip->reset_gpio,
> + GPIOF_DIR_OUT,
> + "pca953x_reset");
> + if (ret == 0) {
> + /* bring chip out of reset */
> + dev_info(&client->dev, "releasing reset\n");
I think dev_dbg would be more appropriate.
> + gpio_set_value(chip->reset_gpio,
> + (chip->reset_gpio_flags ==
> + OF_GPIO_ACTIVE_LOW) ? 1 : 0);
> + }
You could use the gpiod API (include/gpio/consumer.h) here and have it
do the polarity handling automatically.
regards
Philipp
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