soc/intel/common/gpio: distingiush single vs multi acpi devices

Sadly, small core and big core are not aligned with the OS driver's
expectation on the number of ACPI devices used for each community.
Big core uses a single device while small cores use one ACPI device
per community. Allow for this distinction within the common gpio
implementation and ensure apollolake is utilizing the new option
to retain the correct behavior.

Change-Id: I7c7535c36221139ad6c9adde2df10b80eb5c596a
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/20588
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>

src/soc/intel/apollolake/Kconfig

@@ -58,6 +58,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_BLOCK_CPU
 	select SOC_INTEL_COMMON_BLOCK_FAST_SPI
 	select SOC_INTEL_COMMON_BLOCK_GPIO
+	select SOC_INTEL_COMMON_BLOCK_GPIO_MULTI_ACPI_DEVICES
 	select SOC_INTEL_COMMON_BLOCK_GPIO_ITSS_POL_CFG
 	select SOC_INTEL_COMMON_BLOCK_GPIO_IOSTANDBY
 	select SOC_INTEL_COMMON_BLOCK_ITSS

src/soc/intel/common/block/gpio/Kconfig

@@ -34,3 +34,9 @@ config SOC_INTEL_COMMON_BLOCK_GPIO_LEGACY_MACROS
 	depends on SOC_INTEL_COMMON_BLOCK_GPIO
 	bool
 	default n
+
+# Indicate if multiple ACPI devices are used for each gpio community.
+config SOC_INTEL_COMMON_BLOCK_GPIO_MULTI_ACPI_DEVICES
+	depends on SOC_INTEL_COMMON_BLOCK_GPIO
+	bool
+	default n

src/soc/intel/common/block/gpio/gpio.c

@@ -306,7 +306,12 @@ void gpio_set(gpio_t gpio_num, int value)
 
 uint16_t gpio_acpi_pin(gpio_t gpio_num)
 {
-	const struct pad_community *comm = gpio_get_community(gpio_num);
+	const struct pad_community *comm;
+
+	if (!IS_ENABLED(CONFIG_SOC_INTEL_COMMON_BLOCK_GPIO_MULTI_ACPI_DEVICES))
+		return gpio_num;
+
+	comm = gpio_get_community(gpio_num);
 	return gpio_num - comm->first_pad;
 }