clk: mediatek: clk-gate: Refactor mtk_clk_register_gate to use mtk_gate struct

MT8196 uses a HW voter for gate enable/disable control, with
set/clr/sta registers located in a separate regmap. Refactor
mtk_clk_register_gate() to take a struct mtk_gate, and add a pointer to
it in struct mtk_clk_gate. This allows reuse of the static gate data
(including HW voter register offsets) without adding extra function
arguments, and removes redundant duplication in the runtime data struct.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Laura Nao <laura.nao@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: laura-nao

drivers/clk/mediatek/clk-gate.c

@@ -17,10 +17,7 @@
 struct mtk_clk_gate {
 	struct clk_hw	hw;
 	struct regmap	*regmap;
-	int		set_ofs;
-	int		clr_ofs;
-	int		sta_ofs;
-	u8		bit;
+	const struct mtk_gate *gate;
 };
 
 static inline struct mtk_clk_gate *to_mtk_clk_gate(struct clk_hw *hw)
@@ -33,9 +30,9 @@ static u32 mtk_get_clockgating(struct clk_hw *hw)
 	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
 	u32 val;
 
-	regmap_read(cg->regmap, cg->sta_ofs, &val);
+	regmap_read(cg->regmap, cg->gate->regs->sta_ofs, &val);
 
-	return val & BIT(cg->bit);
+	return val & BIT(cg->gate->shift);
 }
 
 static int mtk_cg_bit_is_cleared(struct clk_hw *hw)
@@ -52,28 +49,30 @@ static void mtk_cg_set_bit(struct clk_hw *hw)
 {
 	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
 
-	regmap_write(cg->regmap, cg->set_ofs, BIT(cg->bit));
+	regmap_write(cg->regmap, cg->gate->regs->set_ofs, BIT(cg->gate->shift));
 }
 
 static void mtk_cg_clr_bit(struct clk_hw *hw)
 {
 	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
 
-	regmap_write(cg->regmap, cg->clr_ofs, BIT(cg->bit));
+	regmap_write(cg->regmap, cg->gate->regs->clr_ofs, BIT(cg->gate->shift));
 }
 
 static void mtk_cg_set_bit_no_setclr(struct clk_hw *hw)
 {
 	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
 
-	regmap_set_bits(cg->regmap, cg->sta_ofs, BIT(cg->bit));
+	regmap_set_bits(cg->regmap, cg->gate->regs->sta_ofs,
+			BIT(cg->gate->shift));
 }
 
 static void mtk_cg_clr_bit_no_setclr(struct clk_hw *hw)
 {
 	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
 
-	regmap_clear_bits(cg->regmap, cg->sta_ofs, BIT(cg->bit));
+	regmap_clear_bits(cg->regmap, cg->gate->regs->sta_ofs,
+			  BIT(cg->gate->shift));
 }
 
 static int mtk_cg_enable(struct clk_hw *hw)
@@ -152,12 +151,9 @@ const struct clk_ops mtk_clk_gate_ops_no_setclr_inv = {
 };
 EXPORT_SYMBOL_GPL(mtk_clk_gate_ops_no_setclr_inv);
 
-static struct clk_hw *mtk_clk_register_gate(struct device *dev, const char *name,
-					 const char *parent_name,
-					 struct regmap *regmap, int set_ofs,
-					 int clr_ofs, int sta_ofs, u8 bit,
-					 const struct clk_ops *ops,
-					 unsigned long flags)
+static struct clk_hw *mtk_clk_register_gate(struct device *dev,
+						const struct mtk_gate *gate,
+						struct regmap *regmap)
 {
 	struct mtk_clk_gate *cg;
 	int ret;
@@ -167,18 +163,14 @@ static struct clk_hw *mtk_clk_register_gate(struct device *dev, const char *name
 	if (!cg)
 		return ERR_PTR(-ENOMEM);
 
-	init.name = name;
-	init.flags = flags | CLK_SET_RATE_PARENT;
-	init.parent_names = parent_name ? &parent_name : NULL;
-	init.num_parents = parent_name ? 1 : 0;
-	init.ops = ops;
+	init.name = gate->name;
+	init.flags = gate->flags | CLK_SET_RATE_PARENT;
+	init.parent_names = gate->parent_name ? &gate->parent_name : NULL;
+	init.num_parents = gate->parent_name ? 1 : 0;
+	init.ops = gate->ops;
 
 	cg->regmap = regmap;
-	cg->set_ofs = set_ofs;
-	cg->clr_ofs = clr_ofs;
-	cg->sta_ofs = sta_ofs;
-	cg->bit = bit;
-
+	cg->gate = gate;
 	cg->hw.init = &init;
 
 	ret = clk_hw_register(dev, &cg->hw);
@@ -228,13 +220,7 @@ int mtk_clk_register_gates(struct device *dev, struct device_node *node,
 			continue;
 		}
 
-		hw = mtk_clk_register_gate(dev, gate->name, gate->parent_name,
-					    regmap,
-					    gate->regs->set_ofs,
-					    gate->regs->clr_ofs,
-					    gate->regs->sta_ofs,
-					    gate->shift, gate->ops,
-					    gate->flags);
+		hw = mtk_clk_register_gate(dev, gate, regmap);
 
 		if (IS_ERR(hw)) {
 			pr_err("Failed to register clk %s: %pe\n", gate->name,