linux-kernel - [PATCH v6 7/8] clk: mediatek: clk-apmixed: Add helper function to unregister ref2usb

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Date:   Fri, 22 Jul 2022 11:06:08 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     sboyd@...nel.org
Cc:     mturquette@...libre.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        p.zabel@...gutronix.de, y.oudjana@...tonmail.com,
        angelogioacchino.delregno@...labora.com, jason-jh.lin@...iatek.com,
        ck.hu@...iatek.com, fparent@...libre.com, rex-bc.chen@...iatek.com,
        tinghan.shen@...iatek.com, ikjn@...omium.org,
        miles.chen@...iatek.com, sam.shih@...iatek.com, wenst@...omium.org,
        bgolaszewski@...libre.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-clk@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, paul.bouchara@...ainline.org,
        kernel@...labora.com
Subject: [PATCH v6 7/8] clk: mediatek: clk-apmixed: Add helper function to unregister ref2usb_tx

The ref2usb_tx clock was introduced a long time ago and, at that time,
the MediaTek clock drivers were using CLK_OF_DECLARE, so they would
never unregister.

Nowadays, unregistering clock drivers is a thing, as we're registering
them as platform_driver and allowing them to be kernel modules: add a
helper function to cleanup the ref2usb_tx clock during error handling
and upon module removal.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/clk/mediatek/clk-apmixed.c | 9 +++++++++
 drivers/clk/mediatek/clk-mtk.h     | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/clk/mediatek/clk-apmixed.c b/drivers/clk/mediatek/clk-apmixed.c
index f126da693a7f..60e34f124250 100644
--- a/drivers/clk/mediatek/clk-apmixed.c
+++ b/drivers/clk/mediatek/clk-apmixed.c
@@ -100,4 +100,13 @@ struct clk_hw *mtk_clk_register_ref2usb_tx(const char *name,
 }
 EXPORT_SYMBOL_GPL(mtk_clk_register_ref2usb_tx);
 
+void mtk_clk_unregister_ref2usb_tx(struct clk_hw *hw)
+{
+	struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
+
+	clk_hw_unregister(hw);
+	kfree(tx);
+}
+EXPORT_SYMBOL_GPL(mtk_clk_unregister_ref2usb_tx);
+
 MODULE_LICENSE("GPL");
diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index 1b95c484d5aa..62d650045cba 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -188,6 +188,7 @@ void mtk_free_clk_data(struct clk_hw_onecell_data *clk_data);
 
 struct clk_hw *mtk_clk_register_ref2usb_tx(const char *name,
 			const char *parent_name, void __iomem *reg);
+void mtk_clk_unregister_ref2usb_tx(struct clk_hw *hw);
 
 struct mtk_clk_desc {
 	const struct mtk_gate *clks;
-- 
2.35.1