diff options
Diffstat (limited to 'src/mainboard/google/reef')
| -rw-r--r-- | src/mainboard/google/reef/variants/snappy/devicetree.cb | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/mainboard/google/reef/variants/snappy/devicetree.cb b/src/mainboard/google/reef/variants/snappy/devicetree.cb index f40c3307c6..6adf94c1b3 100644 --- a/src/mainboard/google/reef/variants/snappy/devicetree.cb +++ b/src/mainboard/google/reef/variants/snappy/devicetree.cb @@ -198,6 +198,17 @@ chip soc/intel/apollolake register "desc" = ""Melfas Touchscreen"" register "irq" = "ACPI_IRQ_EDGE_LOW(GPIO_21_IRQ)" register "probed" = "1" + # Melfas TS IC doesn't have reset pin design, current FW also not + # declare "ce-gpios" in ACPI _DSD to let Melfas TS driver to know + # "enable gpio#152 (VTSP) but because of kernel bug & Melfas TS driver + # is unable to separate clear power sequence path for certain + # TS IC (ex: MIT-410) and kernel will still obstain GPIO from _CRS + # by index "0" since no matched "gpio" in ACPI _DSD. + # coreboot needs to have "dummy pin" as workaround in order to let + # kernel driver grab "useless" GPIO to prevent Melfas TS driver cut + # power by driver itself. + register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPIO_36)" + register "reset_delay_ms" = "1" register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPIO_152)" register "enable_delay_ms" = "5" register "has_power_resource" = "1" |