mb/google/fizz: Provide cros_gpio variant API

Add support for ChromeOS GPIO ACPI table information by providing weak

implementation from the baseboard.

BUG=b:117066935
BRANCH=Fizz
TEST=emerge-fizz coreboot

Change-Id: I2fa52c005cacdbcc322d107a3ac92d22df3f3697
Signed-off-by: David Wu <david_wu@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/28964
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/fizz/chromeos.c

@@ -15,6 +15,7 @@
 
 #include <gpio.h>
 #include <rules.h>
+#include <baseboard/variants.h>
 #include <soc/gpio.h>
 #include <vendorcode/google/chromeos/chromeos.h>
 
@@ -44,12 +45,11 @@ int get_write_protect_state(void)
 	return gpio_get(GPIO_PCH_WP);
 }
 
-static const struct cros_gpio cros_gpios[] = {
-	CROS_GPIO_REC_AL(CROS_GPIO_VIRTUAL, CROS_GPIO_DEVICE_NAME),
-	CROS_GPIO_WP_AH(GPIO_PCH_WP, CROS_GPIO_DEVICE_NAME),
-};
-
 void mainboard_chromeos_acpi_generate(void)
 {
-	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
+	const struct cros_gpio *gpios;
+	size_t num;
+
+	gpios = variant_cros_gpios(&num);
+	chromeos_acpi_gpio_generate(gpios, num);
 }

src/mainboard/google/fizz/variants/baseboard/gpio.c

@@ -267,3 +267,14 @@ const struct pad_config * __weak
 	*num = ARRAY_SIZE(early_gpio_table);
 	return early_gpio_table;
 }
+
+static const struct cros_gpio cros_gpios[] = {
+	CROS_GPIO_REC_AL(CROS_GPIO_VIRTUAL, CROS_GPIO_DEVICE_NAME),
+	CROS_GPIO_WP_AH(GPIO_PCH_WP, CROS_GPIO_DEVICE_NAME),
+};
+
+const struct cros_gpio * __weak variant_cros_gpios(size_t *num)
+{
+	*num = ARRAY_SIZE(cros_gpios);
+	return cros_gpios;
+}

src/mainboard/google/fizz/variants/baseboard/include/baseboard/variants.h

@@ -18,6 +18,7 @@
 
 #include <soc/gpio.h>
 #include <stdint.h>
+#include <vendorcode/google/chromeos/chromeos.h>
 
 /*
  * The next set of functions return the gpio table and fill in the number of
@@ -26,5 +27,6 @@
 const struct pad_config *variant_gpio_table(size_t *num);
 const struct pad_config *variant_early_gpio_table(size_t *num);
 
+const struct cros_gpio *variant_cros_gpios(size_t *num);
 
 #endif /* __BASEBOARD_VARIANTS_H__ */