[PATCH v3 18/31] clk: mediatek: Implement mtk_clk_unregister_composites() API

[Chen-Yu Tsai]

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 at chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
Reviewed-by: Miles Chen <miles.chen at mediatek.com>
---
 drivers/clk/mediatek/clk-mtk.c | 46 ++++++++++++++++++++++++++++++++++
 drivers/clk/mediatek/clk-mtk.h |  2 ++
 2 files changed, 48 insertions(+)

diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
index 3a6dfe445e63..869e6ae55c82 100644
--- a/drivers/clk/mediatek/clk-mtk.c
+++ b/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)
diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index e3ae22fb0334..3c3a934f53cd 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/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;
-- 
2.35.0.263.gb82422642f-goog