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Commit 6169005c authored by Brandon Maier's avatar Brandon Maier Committed by Linus Walleij
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gpio: zynq: Report gpio direction at boot 



The Zynq's gpios can be configured by the bootloader. But Linux will
erroneously report all gpios as inputs unless we implement
get_direction().

Signed-off-by: default avatarBrandon Maier <Brandon.Maier@collins.com>
Tested-by: default avatarMichal Simek <michal.simek@xilinx.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 9904f032

drivers/gpio/gpio-zynq.c

+23 −0
Original line number Diff line number Diff line
@@ -357,6 +357,28 @@ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin, 
	return 0;

}



/**

 * zynq_gpio_get_direction - Read the direction of the specified GPIO pin

 * @chip:	gpio_chip instance to be worked on

 * @pin:	gpio pin number within the device

 *

 * This function returns the direction of the specified GPIO.

 *

 * Return: 0 for output, 1 for input

 */

static int zynq_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)

{

	u32 reg;

	unsigned int bank_num, bank_pin_num;

	struct zynq_gpio *gpio = gpiochip_get_data(chip);



	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);



	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));



	return !(reg & BIT(bank_pin_num));

}



/**

 * zynq_gpio_irq_mask - Disable the interrupts for a gpio pin

 * @irq_data:	per irq and chip data passed down to chip functions
@@ -825,6 +847,7 @@ static int zynq_gpio_probe(struct platform_device *pdev) 
	chip->free = zynq_gpio_free;

	chip->direction_input = zynq_gpio_dir_in;

	chip->direction_output = zynq_gpio_dir_out;

	chip->get_direction = zynq_gpio_get_direction;

	chip->base = of_alias_get_id(pdev->dev.of_node, "gpio");

	chip->ngpio = gpio->p_data->ngpio;