[PATCH 054/108] x86: gpio: Add support for obtaining ACPI info for a GPIO
Simon Glass
sjg at chromium.org
Mon Jan 27 06:06:01 CET 2020
Implement the method that converts a GPIO into the form used by ACPI, so
that GPIOs can be added to ACPI tables.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
drivers/gpio/intel_gpio.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/gpio/intel_gpio.c b/drivers/gpio/intel_gpio.c
index c56b362c4e..51ea23df89 100644
--- a/drivers/gpio/intel_gpio.c
+++ b/drivers/gpio/intel_gpio.c
@@ -4,6 +4,7 @@
*/
#include <common.h>
+#include <acpi_device.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
@@ -127,6 +128,33 @@ static int intel_gpio_xlate(struct udevice *orig_dev, struct gpio_desc *desc,
return 0;
}
+#if CONFIG_IS_ENABLED(ACPIGEN)
+static int intel_gpio_get_acpi(const struct gpio_desc *desc,
+ struct acpi_gpio *gpio)
+{
+ struct udevice *pinctrl;
+ int ret;
+
+ if (!dm_gpio_is_valid(desc))
+ return -ENOENT;
+ pinctrl = dev_get_parent(desc->dev);
+
+ memset(gpio, '\0', sizeof(*gpio));
+
+ gpio->type = ACPI_GPIO_TYPE_IO;
+ gpio->pull = ACPI_GPIO_PULL_DEFAULT;
+ gpio->io_restrict = ACPI_GPIO_IO_RESTRICT_OUTPUT;
+ gpio->polarity = ACPI_GPIO_ACTIVE_HIGH;
+ gpio->pin_count = 1;
+ gpio->pins[0] = intel_pinctrl_get_acpi_pin(pinctrl, desc->offset);
+ ret = acpi_device_path(pinctrl, gpio->resource, sizeof(gpio->resource));
+ if (ret)
+ return log_msg_ret("resource", ret);
+
+ return 0;
+}
+#endif
+
static int intel_gpio_probe(struct udevice *dev)
{
return 0;
@@ -151,6 +179,9 @@ static const struct dm_gpio_ops gpio_intel_ops = {
.set_value = intel_gpio_set_value,
.get_function = intel_gpio_get_function,
.xlate = intel_gpio_xlate,
+#if CONFIG_IS_ENABLED(ACPIGEN)
+ .get_acpi = intel_gpio_get_acpi,
+#endif
};
static const struct udevice_id intel_intel_gpio_ids[] = {
--
2.25.0.341.g760bfbb309-goog
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