lib: Add SG2044 CPPC support

Signed-off-by: haijiao.liu <haijiao.liu@sophgo.com>

lib/sbi/objects.mk

@@ -99,3 +99,4 @@ libsbi-objs-y += sbi_trap_v_ldst.o
 libsbi-objs-y += sbi_unpriv.o
 libsbi-objs-y += sbi_expected_trap.o
 libsbi-objs-y += sbi_cppc.o
+libsbi-objs-y += sbi_clk.o

lib/sbi/sbi_clk.c

@@ -0,0 +1,64 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 Sophgo Inc.
+ *
+ * Authors:
+ *   Haijiao Liu <haijiao.liu@sophgo.com>
+ */
+
+#include <sbi/sbi_error.h>
+#include <sbi/sbi_clk.h>
+#include <sbi_utils/clk/fdt_clk.h>
+
+static const struct sbi_clk_device *clk_dev = NULL;
+
+const struct sbi_clk_device *sbi_clk_get_device(const void *fdt)
+{
+	if (!clk_dev)
+		fdt_clk_init(fdt);
+
+	return clk_dev ? clk_dev : NULL;
+}
+
+void sbi_clk_set_device(const struct sbi_clk_device *dev)
+{
+	if (!dev || clk_dev)
+		return;
+
+	clk_dev = dev;
+}
+
+int sbi_clk_set_rate(const char *name, uint64_t rate)
+{
+	if (!clk_dev || !clk_dev->clk_set_rate)
+		return SBI_EFAIL;
+
+	clk_dev->clk_set_rate(name, rate);
+
+	return 0;
+}
+
+uint64_t sbi_clk_get_rate(const char *name)
+{
+	if (!clk_dev || !clk_dev->clk_get_rate)
+		return SBI_EFAIL;
+
+	return clk_dev->clk_get_rate(name);
+}
+
+int sbi_clk_enable(const char *name)
+{
+	if (!clk_dev || !clk_dev->clk_enable)
+		return SBI_EFAIL;
+
+	return clk_dev->clk_enable(name);
+}
+
+int sbi_clk_disable(const char *name)
+{
+	if (!clk_dev || !clk_dev->clk_disable)
+		return SBI_EFAIL;
+
+	return clk_dev->clk_disable(name);
+}