linux-kernel - [PATCH 10/10] clk: mediatek: mt8186-topckgen: Add GPU clock mux notifier

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Message-Id: <20221024102307.33722-11-angelogioacchino.delregno@collabora.com>
Date:   Mon, 24 Oct 2022 12:23:07 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     sboyd@...nel.org
Cc:     mturquette@...libre.com, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, wenst@...omium.org,
        miles.chen@...iatek.com, nfraprado@...labora.com,
        rex-bc.chen@...iatek.com, chun-jie.chen@...iatek.com,
        jose.exposito89@...il.com, yangyingliang@...wei.com,
        msp@...libre.com, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 10/10] clk: mediatek: mt8186-topckgen: Add GPU clock mux notifier

Following the changes done to MT8183, MT8192, MT8195, register a
clock notifier for MT8186, allowing safe clockrate updates for the
MFG PLL.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/clk/mediatek/clk-mt8186-topckgen.c | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/clk/mediatek/clk-mt8186-topckgen.c b/drivers/clk/mediatek/clk-mt8186-topckgen.c
index 62b5ff4a5723..c2beda7ef976 100644
--- a/drivers/clk/mediatek/clk-mt8186-topckgen.c
+++ b/drivers/clk/mediatek/clk-mt8186-topckgen.c
@@ -689,6 +689,28 @@ static const struct of_device_id of_match_clk_mt8186_topck[] = {
 	{}
 };
 
+/* Register mux notifier for MFG mux */
+static int clk_mt8186_reg_mfg_mux_notifier(struct device *dev, struct clk *clk)
+{
+	struct mtk_mux_nb *mfg_mux_nb;
+	int i;
+
+	mfg_mux_nb = devm_kzalloc(dev, sizeof(*mfg_mux_nb), GFP_KERNEL);
+	if (!mfg_mux_nb)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(top_mtk_muxes); i++)
+		if (top_mtk_muxes[i].id == CLK_TOP_MFG)
+			break;
+	if (i == ARRAY_SIZE(top_mtk_muxes))
+		return -EINVAL;
+
+	mfg_mux_nb->ops = top_mtk_muxes[i].ops;
+	mfg_mux_nb->bypass_index = 0; /* Bypass to 26M crystal */
+
+	return devm_mtk_clk_mux_notifier_register(dev, clk, mfg_mux_nb);
+}
+
 static int clk_mt8186_topck_probe(struct platform_device *pdev)
 {
 	struct clk_hw_onecell_data *clk_data;
@@ -730,6 +752,11 @@ static int clk_mt8186_topck_probe(struct platform_device *pdev)
 	if (r)
 		goto unregister_composite_muxes;
 
+	r = clk_mt8186_reg_mfg_mux_notifier(&pdev->dev,
+					    clk_data->hws[CLK_TOP_MFG]->clk);
+	if (r)
+		goto unregister_composite_divs;
+
 	r = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
 	if (r)
 		goto unregister_composite_divs;
-- 
2.37.2