mb/google/volteer: ACPI nodes for volteer2_ti50

Unique among the Volteer devices, the volteer2_ti50 variant connects to
the TPM via I2C.  This CL introduces the proper devicestree declarations
for the Linux kernel to recognize that.

overridetree.cb is shared between "sub"-variants volteer2 and
volteer2_ti50, so both will have two TPM nodes, the I2C being disabled
by default.  The odd _ti50 variant then has code in variant.c to enable
the I2C node and disable the SPI node.

BUG=b:173461736
TEST=abuild -t GOOGLE_VOLTEER2{_TI50,} -c max -x

Change-Id: I5576a595bbabc34c62b768f8b3439e35ff6bcf7b
Signed-off-by: Jes Bodi Klinke <jbk@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48223
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/volteer/Kconfig.name

@@ -61,6 +61,7 @@ config BOARD_GOOGLE_VOLTEER2
 	select VARIANT_HAS_MIPI_CAMERA
 	select SOC_INTEL_CSE_LITE_SKU
 	select DRIVERS_GENESYSLOGIC_GL9755
+	select DRIVER_I2C_TPM_ACPI
 
 # Reworked Volteer2 prototype, Haven chip replaced with Dauntless demo board
 config BOARD_GOOGLE_VOLTEER2_TI50
@@ -69,6 +70,7 @@ config BOARD_GOOGLE_VOLTEER2_TI50
 	select VARIANT_HAS_MIPI_CAMERA
 	select SOC_INTEL_CSE_LITE_SKU
 	select DRIVERS_GENESYSLOGIC_GL9755
+	select DRIVER_I2C_TPM_ACPI
 
 config BOARD_GOOGLE_VOXEL
 	bool "-> Voxel"

src/mainboard/google/volteer/mainboard.c

@@ -23,8 +23,8 @@ extern struct chip_operations drivers_intel_pmc_mux_conn_ops;
 
 static bool is_port1(struct device *dev)
 {
-	return dev->path.type == DEVICE_PATH_GENERIC &&	dev->path.generic.id == 1 &&
-		dev->chip_ops == &drivers_intel_pmc_mux_conn_ops;
+	return dev->path.type == DEVICE_PATH_GENERIC && dev->path.generic.id == 1
+	       && dev->chip_ops == &drivers_intel_pmc_mux_conn_ops;
 }
 
 static void typec_orientation_fixup(void)
@@ -53,14 +53,15 @@ static void typec_orientation_fixup(void)
 	if (!conn)
 		return;
 
-	if (fw_config_probe(FW_CONFIG(DB_USB, USB4_GEN2)) ||
-	    fw_config_probe(FW_CONFIG(DB_USB, USB3_ACTIVE)) ||
-	    fw_config_probe(FW_CONFIG(DB_USB, USB4_GEN3)) ||
-	    fw_config_probe(FW_CONFIG(DB_USB, USB3_NO_A))) {
+	if (fw_config_probe(FW_CONFIG(DB_USB, USB4_GEN2))
+	    || fw_config_probe(FW_CONFIG(DB_USB, USB3_ACTIVE))
+	    || fw_config_probe(FW_CONFIG(DB_USB, USB4_GEN3))
+	    || fw_config_probe(FW_CONFIG(DB_USB, USB3_NO_A))) {
 		struct drivers_intel_pmc_mux_conn_config *config = conn->chip_info;
 
 		if (config) {
-			printk(BIOS_INFO, "Configure Right Type-C port orientation for retimer\n");
+			printk(BIOS_INFO,
+			       "Configure Right Type-C port orientation for retimer\n");
 			config->sbu_orientation = TYPEC_ORIENTATION_NORMAL;
 		}
 	}
@@ -70,6 +71,11 @@ static void mainboard_init(struct device *dev)
 {
 	mainboard_ec_init();
 	typec_orientation_fixup();
+	variant_devtree_update();
+}
+
+void __weak variant_devtree_update(void)
+{
 }
 
 static void add_fw_config_oem_string(const struct fw_config *config, void *arg)

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

@@ -21,4 +21,7 @@ const struct cros_gpio *variant_cros_gpios(size_t *num);
 const struct ddr_memory_cfg *variant_memory_params(void);
 int variant_memory_sku(void);
 
+/* Modify devictree settings during ramstage. */
+void variant_devtree_update(void);
+
 #endif /* __BASEBOARD_VARIANTS_H__ */

src/mainboard/google/volteer/variants/volteer2/Makefile.inc

@@ -3,3 +3,4 @@
 bootblock-y += gpio.c
 
 ramstage-y += gpio.c
+ramstage-y += variant.c

src/mainboard/google/volteer/variants/volteer2/overridetree.cb

@@ -201,6 +201,11 @@ chip soc/intel/tigerlake
 				register "key.label" = ""pen_eject""
 				device generic 0 on end
 			end
+			chip drivers/i2c/tpm
+				register "hid" = ""GOOG0005""
+				register "irq" = "ACPI_IRQ_EDGE_LOW(GPP_C21_IRQ)"
+				device i2c 50 off end
+			end
 		end
 		device ref i2c2 on
 			chip drivers/i2c/sx9310

src/mainboard/google/volteer/variants/volteer2/variant.c

@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <baseboard/variants.h>
+#include <soc/pci_devs.h>
+#include <acpi/acpi_device.h>
+
+extern struct chip_operations drivers_i2c_tpm_ops;
+
+static bool match_i2c_tpm(DEVTREE_CONST struct device *dev)
+{
+	return dev->chip_ops == &drivers_i2c_tpm_ops;
+}
+
+/*
+ * This function runs only on the volteer_ti50 variant, which has the GSC on a
+ * reworked I2C bus.
+ */
+static void devtree_enable_i2c_tpm(void)
+{
+	struct device *spi_tpm = pcidev_path_on_root(PCH_DEVFN_GSPI0)->link_list->children;
+	struct device *i2c_tpm = dev_find_matching_device_on_bus(
+		pcidev_path_on_root(PCH_DEVFN_I2C1)->link_list, match_i2c_tpm);
+	if (!i2c_tpm || !spi_tpm)
+		return;
+	spi_tpm->enabled = 0;
+	i2c_tpm->enabled = 1;
+}
+
+void variant_devtree_update(void)
+{
+	if (CONFIG(MAINBOARD_HAS_I2C_TPM_CR50))
+		devtree_enable_i2c_tpm();
+}