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x86: gpio: Add support for obtaining ACPI info for a GPIO
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@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
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@ -12,6 +12,7 @@
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#include <pch.h>
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#include <pci.h>
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#include <syscon.h>
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#include <acpi/acpi_device.h>
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#include <asm/cpu.h>
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#include <asm/gpio.h>
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#include <asm/intel_pinctrl.h>
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@ -19,6 +20,7 @@
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#include <asm/io.h>
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#include <asm/pci.h>
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#include <asm/arch/gpio.h>
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#include <dm/acpi.h>
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#include <dt-bindings/gpio/x86-gpio.h>
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static int intel_gpio_direction_input(struct udevice *dev, uint offset)
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@ -128,6 +130,35 @@ static int intel_gpio_xlate(struct udevice *orig_dev, struct gpio_desc *desc,
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return 0;
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}
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#if CONFIG_IS_ENABLED(ACPIGEN)
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static int intel_gpio_get_acpi(const struct gpio_desc *desc,
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struct acpi_gpio *gpio)
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{
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struct udevice *pinctrl;
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int ret;
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if (!dm_gpio_is_valid(desc))
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return -ENOENT;
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pinctrl = dev_get_parent(desc->dev);
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memset(gpio, '\0', sizeof(*gpio));
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gpio->type = ACPI_GPIO_TYPE_IO;
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gpio->pull = ACPI_GPIO_PULL_DEFAULT;
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gpio->io_restrict = ACPI_GPIO_IO_RESTRICT_OUTPUT;
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gpio->polarity = ACPI_GPIO_ACTIVE_HIGH;
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gpio->pin_count = 1;
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gpio->pins[0] = intel_pinctrl_get_acpi_pin(pinctrl, desc->offset);
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gpio->pin0_addr = intel_pinctrl_get_config_reg_addr(pinctrl,
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desc->offset);
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ret = acpi_get_path(pinctrl, gpio->resource, sizeof(gpio->resource));
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if (ret)
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return log_msg_ret("resource", ret);
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return 0;
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}
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#endif
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static int intel_gpio_probe(struct udevice *dev)
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{
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return 0;
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@ -152,6 +183,9 @@ static const struct dm_gpio_ops gpio_intel_ops = {
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.set_value = intel_gpio_set_value,
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.get_function = intel_gpio_get_function,
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.xlate = intel_gpio_xlate,
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#if CONFIG_IS_ENABLED(ACPIGEN)
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.get_acpi = intel_gpio_get_acpi,
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#endif
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};
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static const struct udevice_id intel_intel_gpio_ids[] = {
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