[PATCH v3 09/31] clk: mediatek: mux: Implement unregister API

[Chen-Yu Tsai]

The mux 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 mux type clk.

Signed-off-by: Chen-Yu Tsai <wenst at chromium.org>
Reviewed-by: Miles Chen <miles.chen at mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
 drivers/clk/mediatek/clk-mux.c | 35 ++++++++++++++++++++++++++++++++++
 drivers/clk/mediatek/clk-mux.h |  3 +++
 2 files changed, 38 insertions(+)

diff --git a/drivers/clk/mediatek/clk-mux.c b/drivers/clk/mediatek/clk-mux.c
index 89f23e111d91..6f0c22a699c3 100644
--- a/drivers/clk/mediatek/clk-mux.c
+++ b/drivers/clk/mediatek/clk-mux.c
@@ -164,6 +164,21 @@ static struct clk *mtk_clk_register_mux(const struct mtk_mux *mux,
 	return clk;
 }
 
+static void mtk_clk_unregister_mux(struct clk *clk)
+{
+	struct mtk_clk_mux *mux;
+	struct clk_hw *hw;
+
+	hw = __clk_get_hw(clk);
+	if (!hw)
+		return;
+
+	mux = to_mtk_clk_mux(hw);
+
+	clk_unregister(clk);
+	kfree(mux);
+}
+
 int mtk_clk_register_muxes(const struct mtk_mux *muxes,
 			   int num, struct device_node *node,
 			   spinlock_t *lock,
@@ -198,4 +213,24 @@ int mtk_clk_register_muxes(const struct mtk_mux *muxes,
 }
 EXPORT_SYMBOL_GPL(mtk_clk_register_muxes);
 
+void mtk_clk_unregister_muxes(const struct mtk_mux *muxes, int num,
+			      struct clk_onecell_data *clk_data)
+{
+	int i;
+
+	if (!clk_data)
+		return;
+
+	for (i = num; i > 0; i--) {
+		const struct mtk_mux *mux = &muxes[i - 1];
+
+		if (IS_ERR_OR_NULL(clk_data->clks[mux->id]))
+			continue;
+
+		mtk_clk_unregister_mux(clk_data->clks[mux->id]);
+		clk_data->clks[mux->id] = ERR_PTR(-ENOENT);
+	}
+}
+EXPORT_SYMBOL_GPL(mtk_clk_unregister_muxes);
+
 MODULE_LICENSE("GPL");
diff --git a/drivers/clk/mediatek/clk-mux.h b/drivers/clk/mediatek/clk-mux.h
index 27841d649118..cb2ac4f04c58 100644
--- a/drivers/clk/mediatek/clk-mux.h
+++ b/drivers/clk/mediatek/clk-mux.h
@@ -88,4 +88,7 @@ int mtk_clk_register_muxes(const struct mtk_mux *muxes,
 			   spinlock_t *lock,
 			   struct clk_onecell_data *clk_data);
 
+void mtk_clk_unregister_muxes(const struct mtk_mux *muxes, int num,
+			      struct clk_onecell_data *clk_data);
+
 #endif /* __DRV_CLK_MTK_MUX_H */
-- 
2.35.0.263.gb82422642f-goog