linux-kernel - [PATCH 04/30] clk: mediatek: clk-mtk: Introduce mtk_clk_get_hwv

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Message-Id: <20250623102940.214269-5-laura.nao@collabora.com>
Date: Mon, 23 Jun 2025 12:29:14 +0200
From: Laura Nao <laura.nao@...labora.com>
To: mturquette@...libre.com,
	sboyd@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	p.zabel@...gutronix.de,
	richardcochran@...il.com
Cc: guangjie.song@...iatek.com,
	wenst@...omium.org,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	netdev@...r.kernel.org,
	kernel@...labora.com,
	Laura Nao <laura.nao@...labora.com>
Subject: [PATCH 04/30] clk: mediatek: clk-mtk: Introduce mtk_clk_get_hwv_regmap()

On MT8196, some clock controllers use a separate regmap for hardware
voting via set/clear/status registers. Add mtk_clk_get_hwv_regmap() to
retrieve this optional regmap, avoiding duplicated lookup code in 
mtk_clk_register_muxes() and mtk_clk_register_gate().

Signed-off-by: Laura Nao <laura.nao@...labora.com>
---
 drivers/clk/mediatek/clk-mtk.c | 16 ++++++++++++++++
 drivers/clk/mediatek/clk-mtk.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
index ba1d1c495bc2..19cd27941747 100644
--- a/drivers/clk/mediatek/clk-mtk.c
+++ b/drivers/clk/mediatek/clk-mtk.c
@@ -685,4 +685,20 @@ void mtk_clk_simple_remove(struct platform_device *pdev)
 }
 EXPORT_SYMBOL_GPL(mtk_clk_simple_remove);
 
+struct regmap *mtk_clk_get_hwv_regmap(struct device_node *node)
+{
+	struct device_node *hwv_node;
+	struct regmap *regmap_hwv;
+
+	hwv_node = of_parse_phandle(node, "mediatek,hardware-voter", 0);
+	if (!hwv_node)
+		return NULL;
+
+	regmap_hwv = device_node_to_regmap(hwv_node);
+	of_node_put(hwv_node);
+
+	return regmap_hwv;
+}
+EXPORT_SYMBOL_GPL(mtk_clk_get_hwv_regmap);
+
 MODULE_LICENSE("GPL");
diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index 136a4bc6dbe6..8ed2c9208b1f 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -247,5 +247,6 @@ int mtk_clk_pdev_probe(struct platform_device *pdev);
 void mtk_clk_pdev_remove(struct platform_device *pdev);
 int mtk_clk_simple_probe(struct platform_device *pdev);
 void mtk_clk_simple_remove(struct platform_device *pdev);
+struct regmap *mtk_clk_get_hwv_regmap(struct device_node *node);
 
 #endif /* __DRV_CLK_MTK_H */
-- 
2.39.5