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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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27
include/asm-generic/gpio.h
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@@ -10,6 +10,7 @@
#include <dm/ofnode.h>
#include <linux/bitops.h>
struct acpi_gpio;
struct ofnode_phandle_args;
/*
@@ -329,6 +330,20 @@ struct dm_gpio_ops {
*/
int (*get_dir_flags)(struct udevice *dev, unsigned int offset,
ulong *flags);
#if CONFIG_IS_ENABLED(ACPIGEN)
/**
* get_acpi() - Get the ACPI info for a GPIO
*
* This converts a GPIO to an ACPI structure for adding to the ACPI
* tables.
*
* @desc: GPIO description to convert
* @gpio: Output ACPI GPIO information
* @return ACPI pin number or -ve on error
*/
int (*get_acpi)(const struct gpio_desc *desc, struct acpi_gpio *gpio);
#endif
};
/**
@@ -674,4 +689,16 @@ int dm_gpio_get_dir_flags(struct gpio_desc *desc, ulong *flags);
*/
int gpio_get_number(const struct gpio_desc *desc);
/**
* gpio_get_acpi() - Get the ACPI pin for a GPIO
*
* This converts a GPIO to an ACPI pin number for adding to the ACPI
* tables. If the GPIO is invalid, the pin_count and pins[0] are set to 0
*
* @desc: GPIO description to convert
* @gpio: Output ACPI GPIO information
* @return ACPI pin number or -ve on error
*/
int gpio_get_acpi(const struct gpio_desc *desc, struct acpi_gpio *gpio);
#endif /* _ASM_GENERIC_GPIO_H_ */