[coreboot-gerrit] Change in coreboot[master]: driver/intel/pmc_mux/conn: add conn_get_type_c_list()

[Nick Vaccaro (Code Review)]

Attention is currently required from: Patrick Rudolph.
Nick Vaccaro has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/57345 )

Change subject: driver/intel/pmc_mux/conn: add conn_get_type_c_list()
......................................................................

driver/intel/pmc_mux/conn: add conn_get_type_c_list()

Add conn_get_type_c_list() helper routine that returns a pointer to
the start of a verified list of type-c connectors.

BUG=b:149830546
TEST='emerge-volteer coreboot chromeos-bootimage' and verify it builds
successfully.

Change-Id: Ic56a1ad1b617e3af000664147d21165e6ea3a742
Signed-off-by: Nick Vaccaro 
---
M src/drivers/intel/pmc_mux/conn/chip.h
M src/drivers/intel/pmc_mux/conn/conn.c
2 files changed, 36 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/45/57345/1

diff --git a/src/drivers/intel/pmc_mux/conn/chip.h b/src/drivers/intel/pmc_mux/conn/chip.h
index 461916e..9ef3121 100644
--- a/src/drivers/intel/pmc_mux/conn/chip.h
+++ b/src/drivers/intel/pmc_mux/conn/chip.h
@@ -31,4 +31,11 @@
 bool intel_pmc_mux_conn_get_ports(const struct device *conn, unsigned int *usb2_port,
    			unsigned int *usb3_port);

+/*
+ * Method gets the first Type-C port.
+ * Caller can walk the sibling list to get subsequent ports.
+ */
+
+const struct device *conn_get_type_c_list(void);
+
 #endif /* __DRIVERS_INTEL_PMC_MUX_CONN_H__ */
diff --git a/src/drivers/intel/pmc_mux/conn/conn.c b/src/drivers/intel/pmc_mux/conn/conn.c
index b6bf371..8c1ca1d 100644
--- a/src/drivers/intel/pmc_mux/conn/conn.c
+++ b/src/drivers/intel/pmc_mux/conn/conn.c
@@ -3,6 +3,8 @@
 #include <acpi/acpigen.h>
 #include <console/console.h>
 #include <intelblocks/acpi.h>
+#include <soc/pci_devs.h>
+
 #include "chip.h"

static const char *conn_acpi_name(const struct device *dev)
@@ -100,3 +102,30 @@

return true;
 };
+
+const struct device *conn_get_type_c_list(void)
+{
+	const struct device *pmc;
+	const struct device *mux;
+
+	pmc = pcidev_path_on_root(PCH_DEVFN_PMC);
+	if (!pmc || !pmc->link_list->children) {
+		printk(BIOS_ERR, "%s: unable to find PMC device or its mux\n", __func__);
+		return NULL;
+	}
+
+	mux = pmc->link_list->children;
+	if (mux && mux->link_list->children) {
+		const struct device *child = mux->link_list->children;
+
+		/* Verify each child has a drivers_intel_pmc_mux_conn_config chip_info */
+		while (child != NULL) {
+			if (child->chip_ops != &drivers_intel_pmc_mux_conn_ops)
+				return NULL;
+			child = child->sibling;
+		}
+		return mux->link_list->children;
+	}
+
+	return NULL;
+}