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gpio: Add a method to convert a GPIO to ACPI

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When generating ACPI tables we need to convert GPIOs in U-Boot to the ACPI
structures required by ACPI. This is a SoC-specific conversion and cannot
be handled by generic code, so add a new GPIO method to do the conversion.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-07-07 13:11:44 -06:00 • committed by Bin Meng
parent ff715c6f4f
commit 2912686c08
5 changed files with 278 additions and 0 deletions
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22
drivers/gpio/gpio-uclass.c
View file

@ -13,6 +13,7 @@
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <acpi/acpi_device.h>
#include <asm/gpio.h>
#include <dm/device_compat.h>
#include <linux/bug.h>
@ -855,6 +856,27 @@ int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize)
return 0;
}
#if CONFIG_IS_ENABLED(ACPIGEN)
int gpio_get_acpi(const struct gpio_desc *desc, struct acpi_gpio *gpio)
{
struct dm_gpio_ops *ops;
memset(gpio, '\0', sizeof(*gpio));
if (!dm_gpio_is_valid(desc)) {
/* Indicate that the GPIO is not valid */
gpio->pin_count = 0;
gpio->pins[0] = 0;
return -EINVAL;
}
ops = gpio_get_ops(desc->dev);
if (!ops->get_acpi)
return -ENOSYS;
return ops->get_acpi(desc, gpio);
}
#endif
int gpio_claim_vector(const int *gpio_num_array, const char *fmt)
{
int i, ret;