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acpi: Change device properties to work as a tree

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There is a second ACPI _DSD document from the UEFI Forum that details
how _DSD style tables can be nested, creating a tree of similarly
formatted tables.  This document is linked from acpi_device.h.

In order to support this the device property interface needs to be
more flexible and build up a tree of properties to write all entries
at once instead of writing each entry as it is generated.

In the end this is a more flexible solution that can support drivers
that need child tables like the DA7219 codec, while only requiring
minor changes to the existing drivers that use the device property
interface.

This was tested on reef (apollolake) and chell (skylake) boards to
ensure that there was no change in the generated SSDT AML.

Change-Id: Ia22e3a5fd3982ffa7c324bee1a8d190d49f853dd
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/15537
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Duncan Laurie
2016-07-02 19:56:06 -07:00
committed by Martin Roth
parent 9217f9def0
commit ffc9990ece
5 changed files with 353 additions and 161 deletions
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9
src/drivers/generic/max98357a/max98357a.c
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@@ -32,6 +32,7 @@ static void max98357a_fill_ssdt(struct device *dev)
{
struct drivers_generic_max98357a_config *config = dev->chip_info;
const char *path;
struct acpi_dp *dp;
if (!dev->enabled || !config)
return;
@@ -51,12 +52,12 @@ static void max98357a_fill_ssdt(struct device *dev)
acpigen_write_resourcetemplate_footer();
/* _DSD for devicetree properties */
acpi_dp_write_header();
/* This points to the first pin in the first gpio entry in _CRS */
path = acpi_device_path(dev);
acpi_dp_write_gpio("sdmode-gpio", path, 0, 0, 0);
acpi_dp_write_integer("sdmode-delay", config->sdmode_delay);
acpi_dp_write_footer();
dp = acpi_dp_new_table("_DSD");
acpi_dp_add_gpio(dp, "sdmode-gpio", path, 0, 0, 0);
acpi_dp_add_integer(dp, "sdmode-delay", config->sdmode_delay);
acpi_dp_write(dp);
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */