clk: rockchip: add lookup table support

Add support for mapping reset IDs to register offsets
to support gapless continous platform reset IDs.
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20221018151407.63395-9-sebastian.reichel@collabora.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

drivers/clk/rockchip/clk.h

@@ -958,15 +958,24 @@ struct clk *rockchip_clk_register_halfdiv(const char *name,
 					  spinlock_t *lock);
 
 #ifdef CONFIG_RESET_CONTROLLER
-void rockchip_register_softrst(struct device_node *np,
-			       unsigned int num_regs,
-			       void __iomem *base, u8 flags);
+void rockchip_register_softrst_lut(struct device_node *np,
+				   const int *lookup_table,
+				   unsigned int num_regs,
+				   void __iomem *base, u8 flags);
 #else
-static inline void rockchip_register_softrst(struct device_node *np,
-			       unsigned int num_regs,
-			       void __iomem *base, u8 flags)
+static inline void rockchip_register_softrst_lut(struct device_node *np,
+				   const int *lookup_table,
+				   unsigned int num_regs,
+				   void __iomem *base, u8 flags)
 {
 }
 #endif
 
+static inline void rockchip_register_softrst(struct device_node *np,
+					     unsigned int num_regs,
+					     void __iomem *base, u8 flags)
+{
+	return rockchip_register_softrst_lut(np, NULL, num_regs, base, flags);
+}
+
 #endif

drivers/clk/rockchip/softrst.c

@@ -12,6 +12,7 @@
 
 struct rockchip_softrst {
 	struct reset_controller_dev	rcdev;
+	const int			*lut;
 	void __iomem			*reg_base;
 	int				num_regs;
 	int				num_per_reg;
@@ -25,8 +26,13 @@ static int rockchip_softrst_assert(struct reset_controller_dev *rcdev,
 	struct rockchip_softrst *softrst = container_of(rcdev,
 						     struct rockchip_softrst,
 						     rcdev);
-	int bank = id / softrst->num_per_reg;
-	int offset = id % softrst->num_per_reg;
+	int bank, offset;
+
+	if (softrst->lut)
+		id = softrst->lut[id];
+
+	bank = id / softrst->num_per_reg;
+	offset = id % softrst->num_per_reg;
 
 	if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) {
 		writel(BIT(offset) | (BIT(offset) << 16),
@@ -52,8 +58,13 @@ static int rockchip_softrst_deassert(struct reset_controller_dev *rcdev,
 	struct rockchip_softrst *softrst = container_of(rcdev,
 						     struct rockchip_softrst,
 						     rcdev);
-	int bank = id / softrst->num_per_reg;
-	int offset = id % softrst->num_per_reg;
+	int bank, offset;
+
+	if (softrst->lut)
+		id = softrst->lut[id];
+
+	bank = id / softrst->num_per_reg;
+	offset = id % softrst->num_per_reg;
 
 	if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) {
 		writel((BIT(offset) << 16), softrst->reg_base + (bank * 4));
@@ -77,9 +88,10 @@ static const struct reset_control_ops rockchip_softrst_ops = {
 	.deassert	= rockchip_softrst_deassert,
 };
 
-void rockchip_register_softrst(struct device_node *np,
-			       unsigned int num_regs,
-			       void __iomem *base, u8 flags)
+void rockchip_register_softrst_lut(struct device_node *np,
+				   const int *lookup_table,
+				   unsigned int num_regs,
+				   void __iomem *base, u8 flags)
 {
 	struct rockchip_softrst *softrst;
 	int ret;
@@ -91,13 +103,17 @@ void rockchip_register_softrst(struct device_node *np,
 	spin_lock_init(&softrst->lock);
 
 	softrst->reg_base = base;
+	softrst->lut = lookup_table;
 	softrst->flags = flags;
 	softrst->num_regs = num_regs;
 	softrst->num_per_reg = (flags & ROCKCHIP_SOFTRST_HIWORD_MASK) ? 16
 								      : 32;
 
 	softrst->rcdev.owner = THIS_MODULE;
-	softrst->rcdev.nr_resets =  num_regs * softrst->num_per_reg;
+	if (lookup_table)
+		softrst->rcdev.nr_resets = num_regs;
+	else
+		softrst->rcdev.nr_resets = num_regs * softrst->num_per_reg;
 	softrst->rcdev.ops = &rockchip_softrst_ops;
 	softrst->rcdev.of_node = np;
 	ret = reset_controller_register(&softrst->rcdev);
@@ -107,4 +123,4 @@ void rockchip_register_softrst(struct device_node *np,
 		kfree(softrst);
 	}
 };
-EXPORT_SYMBOL_GPL(rockchip_register_softrst);
+EXPORT_SYMBOL_GPL(rockchip_register_softrst_lut);