clk: mediatek: Implement mtk_clk_unregister_composites() API

mtk_clk_register_composites(), as the name suggests, is used to register
a given list of composite clks. However it is lacking a counterpart
unregister API.

Implement said unregister API so that the various clock platform drivers
can utilize it to do proper unregistration, cleanup and removal.

In the header file, the register function's declaration is also
reformatted to fit code style guidelines.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Miles Chen <miles.chen@mediatek.com>
Link: https://lore.kernel.org/r/20220208124034.414635-19-wenst@chromium.org
Reviewed-by: Chun-Jie Chen <chun-jie.chen@mediatek.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: wens

drivers/clk/mediatek/clk-mtk.c

@@ -233,6 +233,32 @@ struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
 	return ERR_PTR(ret);
 }
 
+static void mtk_clk_unregister_composite(struct clk *clk)
+{
+	struct clk_hw *hw;
+	struct clk_composite *composite;
+	struct clk_mux *mux = NULL;
+	struct clk_gate *gate = NULL;
+	struct clk_divider *div = NULL;
+
+	hw = __clk_get_hw(clk);
+	if (!hw)
+		return;
+
+	composite = to_clk_composite(hw);
+	if (composite->mux_hw)
+		mux = to_clk_mux(composite->mux_hw);
+	if (composite->gate_hw)
+		gate = to_clk_gate(composite->gate_hw);
+	if (composite->rate_hw)
+		div = to_clk_divider(composite->rate_hw);
+
+	clk_unregister_composite(clk);
+	kfree(div);
+	kfree(gate);
+	kfree(mux);
+}
+
 void mtk_clk_register_composites(const struct mtk_composite *mcs,
 		int num, void __iomem *base, spinlock_t *lock,
 		struct clk_onecell_data *clk_data)
@@ -259,6 +285,26 @@ void mtk_clk_register_composites(const struct mtk_composite *mcs,
 }
 EXPORT_SYMBOL_GPL(mtk_clk_register_composites);
 
+void mtk_clk_unregister_composites(const struct mtk_composite *mcs, int num,
+				   struct clk_onecell_data *clk_data)
+{
+	int i;
+
+	if (!clk_data)
+		return;
+
+	for (i = num; i > 0; i--) {
+		const struct mtk_composite *mc = &mcs[i - 1];
+
+		if (IS_ERR_OR_NULL(clk_data->clks[mc->id]))
+			continue;
+
+		mtk_clk_unregister_composite(clk_data->clks[mc->id]);
+		clk_data->clks[mc->id] = ERR_PTR(-ENOENT);
+	}
+}
+EXPORT_SYMBOL_GPL(mtk_clk_unregister_composites);
+
 void mtk_clk_register_dividers(const struct mtk_clk_divider *mcds,
 			int num, void __iomem *base, spinlock_t *lock,
 				struct clk_onecell_data *clk_data)

drivers/clk/mediatek/clk-mtk.h

@@ -153,6 +153,8 @@ struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
 void mtk_clk_register_composites(const struct mtk_composite *mcs,
 		int num, void __iomem *base, spinlock_t *lock,
 		struct clk_onecell_data *clk_data);
+void mtk_clk_unregister_composites(const struct mtk_composite *mcs, int num,
+				   struct clk_onecell_data *clk_data);
 
 struct mtk_clk_divider {
 	int id;