mb/google/dedede/var/cret: Enable/disable LTE function based on FW_CONFIG

Enable/disable LTE function based on LTE bit of FW_CONFIG.
The LTE function settings are included GPIO settings, USB port settings and
power off sequence.

BUG=b:187797408
BRANCH=dedede
TEST=Build and test the change on cret.

Signed-off-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>
Change-Id: Ib926e99aaf9df433a7cff71180ee55431d69f718
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54057
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/mainboard/google/dedede/variants/baseboard/devicetree.cb

@@ -17,6 +17,10 @@ fw_config
 		option RT1015_I2C 2
 		option RT1015P_AUTO 3
 	end
+	field LTE 11
+		option LTE_ABSENT 0
+		option LTE_PRESENT 1
+	end
 end
 
 chip soc/intel/jasperlake

src/mainboard/google/dedede/variants/cret/gpio.c

@@ -2,6 +2,8 @@
 
 #include <baseboard/gpio.h>
 #include <baseboard/variants.h>
+#include <bootstate.h>
+#include <fw_config.h>
 
 /* Pad configuration in ramstage */
 static const struct pad_config override_gpio_table[] = {
@@ -59,8 +61,21 @@ static const struct pad_config override_gpio_table[] = {
 	PAD_NC(GPP_G7, NONE),
 };
 
+static const struct pad_config lte_disable_pads[] = {
+	PAD_NC(GPP_A10, NONE),
+	PAD_NC(GPP_D0, NONE),
+	PAD_NC(GPP_H17, NONE),
+};
+
 const struct pad_config *variant_override_gpio_table(size_t *num)
 {
 	*num = ARRAY_SIZE(override_gpio_table);
 	return override_gpio_table;
 }
+
+static void fw_config_handle(void *unused)
+{
+	if (!fw_config_probe(FW_CONFIG(LTE, LTE_PRESENT)))
+		gpio_configure_pads(lte_disable_pads, ARRAY_SIZE(lte_disable_pads));
+}
+BOOT_STATE_INIT_ENTRY(BS_DEV_ENABLE, BS_ON_ENTRY, fw_config_handle, NULL);

src/mainboard/google/dedede/variants/cret/overridetree.cb

@@ -57,7 +57,9 @@ chip soc/intel/jasperlake
 					chip drivers/usb/acpi
 						register "desc" = ""LTE""
 						register "type" = "UPC_TYPE_INTERNAL"
-						device usb 2.3 on end
+						device usb 2.3 on
+							probe LTE LTE_PRESENT
+						end
 					end
 					chip drivers/usb/acpi
 						register "desc" = ""Camera (UFC)""
@@ -82,7 +84,9 @@ chip soc/intel/jasperlake
 						register "enable_gpio" =
 							"ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_A10)"
 						register "enable_delay_ms" = "20"
-						device usb 3.3 on end
+						device usb 3.3 on
+							probe LTE LTE_PRESENT
+						end
 					end
 				end
 			end