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>
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 @@
*/
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 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_ */