linux-kernel - [PATCH v2 07/10] clk: mediatek: clk-mt8195-topckgen: Add GPU clock mux notifier

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Message-Id: <20220915072458.18232-8-angelogioacchino.delregno@collabora.com>
Date:   Thu, 15 Sep 2022 09:24:55 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     matthias.bgg@...il.com
Cc:     mturquette@...libre.com, sboyd@...nel.org,
        angelogioacchino.delregno@...labora.com, wenst@...omium.org,
        miles.chen@...iatek.com, rex-bc.chen@...iatek.com,
        nfraprado@...labora.com, chun-jie.chen@...iatek.com,
        jose.exposito89@...il.com, drinkcat@...omium.org,
        weiyi.lu@...iatek.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Subject: [PATCH v2 07/10] clk: mediatek: clk-mt8195-topckgen: Add GPU clock mux notifier

Following the changes done to MT8183, register a similar notifier
for MT8195 as well, allowing safe clockrate updates for the MFGPLL.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Miles Chen <miles.chen@...iatek.com>
---
 drivers/clk/mediatek/clk-mt8195-topckgen.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/clk/mediatek/clk-mt8195-topckgen.c b/drivers/clk/mediatek/clk-mt8195-topckgen.c
index e1c3ab4e146b..4dde23bece66 100644
--- a/drivers/clk/mediatek/clk-mt8195-topckgen.c
+++ b/drivers/clk/mediatek/clk-mt8195-topckgen.c
@@ -1217,6 +1217,21 @@ static const struct of_device_id of_match_clk_mt8195_topck[] = {
 	{}
 };
 
+/* Register mux notifier for MFG mux */
+static int clk_mt8195_reg_mfg_mux_notifier(struct device *dev, struct clk *clk)
+{
+	struct mtk_mux_nb *mfg_mux_nb;
+
+	mfg_mux_nb = devm_kzalloc(dev, sizeof(*mfg_mux_nb), GFP_KERNEL);
+	if (!mfg_mux_nb)
+		return -ENOMEM;
+
+	mfg_mux_nb->ops = &clk_mux_ops;
+	mfg_mux_nb->bypass_index = 0; /* Bypass to TOP_MFG_CORE_TMP */
+
+	return devm_mtk_clk_mux_notifier_register(dev, clk, mfg_mux_nb);
+}
+
 static int clk_mt8195_topck_probe(struct platform_device *pdev)
 {
 	struct clk_hw_onecell_data *top_clk_data;
@@ -1256,6 +1271,11 @@ static int clk_mt8195_topck_probe(struct platform_device *pdev)
 		goto unregister_muxes;
 	top_clk_data->hws[CLK_TOP_MFG_CK_FAST_REF] = hw;
 
+	r = clk_mt8195_reg_mfg_mux_notifier(&pdev->dev,
+					    top_clk_data->hws[CLK_TOP_MFG_CK_FAST_REF]->clk);
+	if (r)
+		goto unregister_muxes;
+
 	r = mtk_clk_register_composites(top_adj_divs, ARRAY_SIZE(top_adj_divs), base,
 					&mt8195_clk_lock, top_clk_data);
 	if (r)
-- 
2.37.2