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drivers/i2c/generic: Add "compatible" property to _DSD 

This change adds support for allowing devices to provide a
"compatible" property string that can be used when _HID is set to
PRP00001. This is used to allow Linux kernel drivers to match the
device to appropriate driver based on the OF-style compatible
string.

Reference:
https://www.kernel.org/doc/Documentation/acpi/enumeration.txt

BUG=b:129162037
TEST=Verified that atmel touchscreen gets enumerated correctly on
kohaku using PRP0001 and compatible string.

Change-Id: I8a306854c67ab2f056ea8774df46599ef0c55761
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34813
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
This commit is contained in:
Furquan Shaikh 2019-08-09 07:59:06 -07:00 committed by Shelley Chen
parent 8c206c9fdd
commit 8ce36ac548
2 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/drivers/i2c/generic/chip.h
View File

@ -28,6 +28,7 @@ struct drivers_i2c_generic_config {
const char *desc; /* Device Description */
unsigned uid; /* ACPI _UID */
enum i2c_speed speed; /* Bus speed in Hz, default is I2C_SPEED_FAST */
const char *compat_string; /* Compatible string for _HID=PRP0001 */
unsigned wake; /* Wake GPE */
struct acpi_irq irq; /* Interrupt */

5
src/drivers/i2c/generic/generic.c
View File

@ -116,10 +116,13 @@ void i2c_generic_fill_ssdt(struct device *dev,
}
/* DSD */
if (config->probed || config->property_count ||
if (config->probed || config->property_count || config->compat_string ||
(reset_gpio_index != -1) ||
(enable_gpio_index != -1) || (irq_gpio_index != -1)) {
dsd = acpi_dp_new_table("_DSD");
if (config->compat_string)
acpi_dp_add_string(dsd, "compatible",
config->compat_string);
if (config->probed)
acpi_dp_add_integer(dsd, "linux,probed", 1);
if (irq_gpio_index != -1)