lib: utils: Add simple FDT based HSM driver framework

The generic platform can have multiple HSM drivers so add a simple
FDT based HSM driver framework.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>

lib/utils/hsm/Kconfig

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: BSD-2-Clause
+
+menu "HSM Device Support"
+
+config FDT_HSM
+	bool "FDT based HSM drivers"
+	depends on FDT
+	default n
+
+endmenu

lib/utils/hsm/fdt_hsm.c

@@ -0,0 +1,22 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2024 Ventana Micro Systems Inc.
+ *
+ * Authors:
+ *   Anup Patel <apatel@ventanamicro.com>
+ */
+
+#include <sbi_utils/hsm/fdt_hsm.h>
+
+/* List of FDT HSM drivers generated at compile time */
+extern const struct fdt_driver *const fdt_hsm_drivers[];
+
+void fdt_hsm_init(const void *fdt)
+{
+	/*
+	 * Platforms might have multiple HSM devices or might
+	 * not have any so probe all and don't fail.
+	 */
+	fdt_driver_init_all(fdt, fdt_hsm_drivers);
+}

lib/utils/hsm/fdt_hsm_drivers.carray

@@ -0,0 +1,3 @@
+HEADER: sbi_utils/hsm/fdt_hsm.h
+TYPE: const struct fdt_driver
+NAME: fdt_hsm_drivers

lib/utils/hsm/objects.mk

@@ -0,0 +1,11 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2024 Ventana Micro Systems Inc.
+#
+# Authors:
+#   Anup Patel <apatel@ventanamicro.com>
+#
+
+libsbiutils-objs-$(CONFIG_FDT_HSM) += hsm/fdt_hsm.o
+libsbiutils-objs-$(CONFIG_FDT_HSM) += hsm/fdt_hsm_drivers.carray.o