[PATCH v3 16/31] clk: mediatek: Implement mtk_clk_unregister_factors() API

[Chen-Yu Tsai]

mtk_clk_register_factors(), as the name suggests, is used to register
a given list of fixed factor 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: Miles Chen <miles.chen at mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
 drivers/clk/mediatek/clk-mtk.c | 20 ++++++++++++++++++++
 drivers/clk/mediatek/clk-mtk.h |  6 ++++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
index 7c0d5706eed7..b267b2f04b84 100644
--- a/drivers/clk/mediatek/clk-mtk.c
+++ b/drivers/clk/mediatek/clk-mtk.c
@@ -126,6 +126,26 @@ void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
 }
 EXPORT_SYMBOL_GPL(mtk_clk_register_factors);
 
+void mtk_clk_unregister_factors(const struct mtk_fixed_factor *clks, int num,
+				struct clk_onecell_data *clk_data)
+{
+	int i;
+
+	if (!clk_data)
+		return;
+
+	for (i = num; i > 0; i--) {
+		const struct mtk_fixed_factor *ff = &clks[i - 1];
+
+		if (IS_ERR_OR_NULL(clk_data->clks[ff->id]))
+			continue;
+
+		clk_unregister_fixed_factor(clk_data->clks[ff->id]);
+		clk_data->clks[ff->id] = ERR_PTR(-ENOENT);
+	}
+}
+EXPORT_SYMBOL_GPL(mtk_clk_unregister_factors);
+
 struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
 		void __iomem *base, spinlock_t *lock)
 {
diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index cc7f920eabb4..4db1a97c1250 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -55,8 +55,10 @@ struct mtk_fixed_factor {
 		.div = _div,				\
 	}
 
-void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
-		int num, struct clk_onecell_data *clk_data);
+void mtk_clk_register_factors(const struct mtk_fixed_factor *clks, int num,
+			      struct clk_onecell_data *clk_data);
+void mtk_clk_unregister_factors(const struct mtk_fixed_factor *clks, int num,
+				struct clk_onecell_data *clk_data);
 
 struct mtk_composite {
 	int id;
-- 
2.35.0.263.gb82422642f-goog