mb/amd/birman_plus: Add Birman+ board support for Phoenix SOC

1) Initial commit for upstreaming Birmanplus mainboard changes.
2) Add the DXIO descriptors for Birmanplus mainboard.

Change-Id: I075dcf0214f8dc8b33b0e429d83d270b2f0952e1
Signed-off-by: Anand Vaikar <a.vaikar2021@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80353
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/mainboard/amd/birman_plus/chromeos.c b/src/mainboard/amd/birman_plus/chromeos.c
new file mode 100644
index 0000000000..515da94df1
--- /dev/null
+++ b/src/mainboard/amd/birman_plus/chromeos.c
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <bootmode.h>
+#include <boot/coreboot_tables.h>
+#include <gpio.h>
+#include <types.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+
+void fill_lb_gpios(struct lb_gpios *gpios)
+{
+	struct lb_gpio chromeos_gpios[] = {};
+	lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios));
+}
+
+int get_write_protect_state(void)
+{
+	/* Birman doesn't have a write protect pin */
+	return 0;
+}
+
+DECLARE_NO_CROS_GPIOS();