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| author | Simon Glass <sjg@chromium.org> | 2020-07-07 13:11:44 -0600 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2020-07-17 14:32:24 +0800 |
| commit | 2912686c08c33aff5269512de962dffb35fbee7c (patch) | |
| tree | 63cb8bf65f09084ce34c62d4c3da14ce69e860b7 /include/asm-generic | |
| parent | ff715c6f4f7a3181fcc6a45907bb8bf0c8c6f08f (diff) | |
| download | u-boot-2912686c08c33aff5269512de962dffb35fbee7c.zip u-boot-2912686c08c33aff5269512de962dffb35fbee7c.tar.gz u-boot-2912686c08c33aff5269512de962dffb35fbee7c.tar.bz2 | |
gpio: Add a method to convert a GPIO to ACPI
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>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/gpio.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index e16c2f3..a57dd26 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -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_ */ |