clk: mediatek: gate: Implement unregister API

The gate clk type within the MediaTek clk driver library only has a
register function, and no corresponding unregister function. This
means there is no way for its users to properly implement cleanup
and removal.

Add a matching unregister function for the gate type clk.
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Miles Chen <miles.chen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220208124034.414635-5-wenst@chromium.orgReviewed-by: Chun-Jie Chen <chun-jie.chen@mediatek.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/mediatek/clk-gate.c

@@ -193,6 +193,21 @@ static struct clk *mtk_clk_register_gate(const char *name,
 	return clk;
 }
 
+static void mtk_clk_unregister_gate(struct clk *clk)
+{
+	struct mtk_clk_gate *cg;
+	struct clk_hw *hw;
+
+	hw = __clk_get_hw(clk);
+	if (!hw)
+		return;
+
+	cg = to_mtk_clk_gate(hw);
+
+	clk_unregister(clk);
+	kfree(cg);
+}
+
 int mtk_clk_register_gates_with_dev(struct device_node *node,
 				    const struct mtk_gate *clks, int num,
 				    struct clk_onecell_data *clk_data,
@@ -244,4 +259,24 @@ int mtk_clk_register_gates(struct device_node *node,
 }
 EXPORT_SYMBOL_GPL(mtk_clk_register_gates);
 
+void mtk_clk_unregister_gates(const struct mtk_gate *clks, int num,
+			      struct clk_onecell_data *clk_data)
+{
+	int i;
+
+	if (!clk_data)
+		return;
+
+	for (i = num; i > 0; i--) {
+		const struct mtk_gate *gate = &clks[i - 1];
+
+		if (IS_ERR_OR_NULL(clk_data->clks[gate->id]))
+			continue;
+
+		mtk_clk_unregister_gate(clk_data->clks[gate->id]);
+		clk_data->clks[gate->id] = ERR_PTR(-ENOENT);
+	}
+}
+EXPORT_SYMBOL_GPL(mtk_clk_unregister_gates);
+
 MODULE_LICENSE("GPL");

drivers/clk/mediatek/clk-gate.h

@@ -55,4 +55,7 @@ int mtk_clk_register_gates_with_dev(struct device_node *node,
 				    struct clk_onecell_data *clk_data,
 				    struct device *dev);
 
+void mtk_clk_unregister_gates(const struct mtk_gate *clks, int num,
+			      struct clk_onecell_data *clk_data);
+
 #endif /* __DRV_CLK_GATE_H */