clk: rockchip: Implement rockchip_clk_disable_unused() for gki

Change-Id: I597fc35690d7a76dbc109e86db4045a1ddb3796d
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>

drivers/clk/rockchip/clk.c

@@ -24,6 +24,10 @@
 #include <linux/rational.h>
 #include "clk.h"
 
+#ifdef MODULE
+static HLIST_HEAD(clk_ctx_list);
+#endif
+
 /**
  * Register a clock branch.
  * Most clock branches have a form like
@@ -433,6 +437,10 @@ struct rockchip_clk_provider *rockchip_clk_init(struct device_node *np,
 	ctx->pmugrf = syscon_regmap_lookup_by_phandle(ctx->cru_node,
 						   "rockchip,pmugrf");
 
+#ifdef MODULE
+	hlist_add_head(&ctx->list_node, &clk_ctx_list);
+#endif
+
 	return ctx;
 
 err_free:
@@ -798,4 +806,30 @@ void rockchip_clk_unprotect(void)
 
 }
 EXPORT_SYMBOL_GPL(rockchip_clk_unprotect);
+
+void rockchip_clk_disable_unused(void)
+{
+	struct rockchip_clk_provider *ctx;
+	struct clk *clk;
+	struct clk_hw *hw;
+	int i = 0, flag = 0;
+
+	hlist_for_each_entry(ctx, &clk_ctx_list, list_node) {
+		for (i = 0; i < ctx->clk_data.clk_num; i++) {
+			clk = ctx->clk_data.clks[i];
+			if (clk && !IS_ERR(clk)) {
+				hw = __clk_get_hw(clk);
+				if (hw)
+					flag = clk_hw_get_flags(hw);
+				if (flag & CLK_IGNORE_UNUSED)
+					continue;
+				if (flag & CLK_IS_CRITICAL)
+					continue;
+				clk_prepare_enable(clk);
+				clk_disable_unprepare(clk);
+			}
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(rockchip_clk_disable_unused);
 #endif /* MODULE */

drivers/clk/rockchip/clk.h

@@ -498,6 +498,7 @@ enum rockchip_pll_type {
  * @clk_data: holds clock related data like clk* and number of clocks.
  * @cru_node: device-node of the clock-provider
  * @grf: regmap of the general-register-files syscon
+ * @list_node: node in the global ctx list
  * @lock: maintains exclusion between callbacks for a given clock-provider.
  */
 struct rockchip_clk_provider {
@@ -506,6 +507,7 @@ struct rockchip_clk_provider {
 	struct device_node *cru_node;
 	struct regmap *grf;
 	struct regmap *pmugrf;
+	struct hlist_node list_node;
 	spinlock_t lock;
 };
 
@@ -1313,6 +1315,7 @@ extern void (*rk_dump_cru)(void);
 int rockchip_clk_protect(struct rockchip_clk_provider *ctx,
 			 unsigned int *clocks, unsigned int nclocks);
 void rockchip_clk_unprotect(void);
+void rockchip_clk_disable_unused(void);
 #else
 static inline int rockchip_clk_protect(struct rockchip_clk_provider *ctx,
 				       unsigned int *clocks,
@@ -1324,5 +1327,9 @@ static inline int rockchip_clk_protect(struct rockchip_clk_provider *ctx,
 static inline void rockchip_clk_unprotect(void)
 {
 }
+
+static inline void rockchip_clk_disable_unused(void)
+{
+}
 #endif
 #endif