add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/clk/clk-devres.c
..
..
@@ -4,41 +4,100 @@
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 #include <linux/export.h>
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 #include <linux/gfp.h>
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+struct devm_clk_state {
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+	struct clk *clk;
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+	void (*exit)(struct clk *clk);
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+};
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+
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 static void devm_clk_release(struct device *dev, void *res)
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 {
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-	clk_put(*(struct clk **)res);
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+	struct devm_clk_state *state = res;
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+
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+	if (state->exit)
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+		state->exit(state->clk);
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+
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+	clk_put(state->clk);
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+}
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+
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+static struct clk *__devm_clk_get(struct device *dev, const char *id,
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+				  struct clk *(*get)(struct device *dev, const char *id),
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+				  int (*init)(struct clk *clk),
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+				  void (*exit)(struct clk *clk))
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+{
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+	struct devm_clk_state *state;
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+	struct clk *clk;
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+	int ret;
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+
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+	state = devres_alloc(devm_clk_release, sizeof(*state), GFP_KERNEL);
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+	if (!state)
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+		return ERR_PTR(-ENOMEM);
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+
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+	clk = get(dev, id);
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+	if (IS_ERR(clk)) {
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+		ret = PTR_ERR(clk);
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+		goto err_clk_get;
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+	}
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+
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+	if (init) {
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+		ret = init(clk);
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+		if (ret)
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+			goto err_clk_init;
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+	}
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+
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+	state->clk = clk;
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+	state->exit = exit;
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+
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+	devres_add(dev, state);
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+
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+	return clk;
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+
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+err_clk_init:
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+
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+	clk_put(clk);
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+err_clk_get:
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+
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+	devres_free(state);
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+	return ERR_PTR(ret);
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 }
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 struct clk *devm_clk_get(struct device *dev, const char *id)
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 {
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-	struct clk **ptr, *clk;
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-
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-	ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
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-	if (!ptr)
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-		return ERR_PTR(-ENOMEM);
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-
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-	clk = clk_get(dev, id);
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-	if (!IS_ERR(clk)) {
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-		*ptr = clk;
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-		devres_add(dev, ptr);
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-	} else {
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-		devres_free(ptr);
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-	}
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-
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-	return clk;
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+	return __devm_clk_get(dev, id, clk_get, NULL, NULL);
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 }
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 EXPORT_SYMBOL(devm_clk_get);
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68
 
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+struct clk *devm_clk_get_prepared(struct device *dev, const char *id)
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+{
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+	return __devm_clk_get(dev, id, clk_get, clk_prepare, clk_unprepare);
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+}
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+EXPORT_SYMBOL_GPL(devm_clk_get_prepared);
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+
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+struct clk *devm_clk_get_enabled(struct device *dev, const char *id)
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+{
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+	return __devm_clk_get(dev, id, clk_get,
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+			      clk_prepare_enable, clk_disable_unprepare);
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+}
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+EXPORT_SYMBOL_GPL(devm_clk_get_enabled);
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+
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 struct clk *devm_clk_get_optional(struct device *dev, const char *id)
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 {
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-	struct clk *clk = devm_clk_get(dev, id);
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-
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-	if (clk == ERR_PTR(-ENOENT))
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-		return NULL;
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-
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-	return clk;
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+	return __devm_clk_get(dev, id, clk_get_optional, NULL, NULL);
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 }
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 EXPORT_SYMBOL(devm_clk_get_optional);
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+
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+struct clk *devm_clk_get_optional_prepared(struct device *dev, const char *id)
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+{
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+	return __devm_clk_get(dev, id, clk_get_optional,
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+			      clk_prepare, clk_unprepare);
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+}
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+EXPORT_SYMBOL_GPL(devm_clk_get_optional_prepared);
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+
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+struct clk *devm_clk_get_optional_enabled(struct device *dev, const char *id)
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+{
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+	return __devm_clk_get(dev, id, clk_get_optional,
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+			      clk_prepare_enable, clk_disable_unprepare);
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+}
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+EXPORT_SYMBOL_GPL(devm_clk_get_optional_enabled);
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 struct clk_bulk_devres {
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 	struct clk_bulk_data *clks;
..
..
@@ -146,18 +205,19 @@
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 struct clk *devm_get_clk_from_child(struct device *dev,
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 				    struct device_node *np, const char *con_id)
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 {
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-	struct clk **ptr, *clk;
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+	struct devm_clk_state *state;
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+	struct clk *clk;
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-	ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
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-	if (!ptr)
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+	state = devres_alloc(devm_clk_release, sizeof(*state), GFP_KERNEL);
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+	if (!state)
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 		return ERR_PTR(-ENOMEM);
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 	clk = of_clk_get_by_name(np, con_id);
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 	if (!IS_ERR(clk)) {
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-		*ptr = clk;
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-		devres_add(dev, ptr);
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+		state->clk = clk;
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+		devres_add(dev, state);
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 	} else {
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-		devres_free(ptr);
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+		devres_free(state);
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 	}
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 	return clk;