clk: scmi: Introduce common header for SCMI clock interface

Added a new header file 'clk-scmi.h' to define common structures and
interfaces for the SCMI clock driver. This header will also be used by
OEM-specific extensions to ensure consistency and reusability.

Moved relevant structure definitions from the driver implementation to
'clk-scmi.h' to facilitate shared usage.

Reviewed-by: Sebin Francis <sebin.francis@ti.com>
Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Brian Masney <bmasney@redhat.com>

drivers/clk/clk-scmi.c

@@ -13,32 +13,7 @@
 #include <linux/module.h>
 #include <linux/scmi_protocol.h>
 
-#define NOT_ATOMIC	false
-#define ATOMIC		true
-
-enum scmi_clk_feats {
-	SCMI_CLK_ATOMIC_SUPPORTED,
-	SCMI_CLK_STATE_CTRL_SUPPORTED,
-	SCMI_CLK_RATE_CTRL_SUPPORTED,
-	SCMI_CLK_PARENT_CTRL_SUPPORTED,
-	SCMI_CLK_DUTY_CYCLE_SUPPORTED,
-	SCMI_CLK_FEATS_COUNT
-};
-
-#define SCMI_MAX_CLK_OPS	BIT(SCMI_CLK_FEATS_COUNT)
-
-static const struct scmi_clk_proto_ops *scmi_proto_clk_ops;
-
-struct scmi_clk {
-	u32 id;
-	struct device *dev;
-	struct clk_hw hw;
-	const struct scmi_clock_info *info;
-	const struct scmi_protocol_handle *ph;
-	struct clk_parent_data *parent_data;
-};
-
-#define to_scmi_clk(clk) container_of(clk, struct scmi_clk, hw)
+const struct scmi_clk_proto_ops *scmi_proto_clk_ops;
 
 static unsigned long scmi_clk_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)

drivers/clk/clk-scmi.h

@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Copyright 2025 NXP
+ */
+
+#ifndef __SCMI_CLK_H
+#define __SCMI_CLK_H
+
+#include <linux/bits.h>
+#include <linux/scmi_protocol.h>
+#include <linux/types.h>
+
+#define NOT_ATOMIC	false
+#define ATOMIC		true
+
+enum scmi_clk_feats {
+	SCMI_CLK_ATOMIC_SUPPORTED,
+	SCMI_CLK_STATE_CTRL_SUPPORTED,
+	SCMI_CLK_RATE_CTRL_SUPPORTED,
+	SCMI_CLK_PARENT_CTRL_SUPPORTED,
+	SCMI_CLK_DUTY_CYCLE_SUPPORTED,
+	SCMI_CLK_FEATS_COUNT
+};
+
+#define SCMI_MAX_CLK_OPS	BIT(SCMI_CLK_FEATS_COUNT)
+
+struct scmi_clk {
+	u32 id;
+	struct device *dev;
+	struct clk_hw hw;
+	const struct scmi_clock_info *info;
+	const struct scmi_protocol_handle *ph;
+	struct clk_parent_data *parent_data;
+};
+
+#define to_scmi_clk(clk) container_of(clk, struct scmi_clk, hw)
+
+extern const struct scmi_clk_proto_ops *scmi_proto_clk_ops;
+
+#endif