[PATCH v3 01/16] regmap-irq: Use sub_irq_reg() to calculate unmask register address

[Aidan MacDonald <aidanmacdonald.0x0@gmail.com>]

Call sub_irq_reg() instead of calculating the offset of the register
to avoid relying on the fact that sub_irq_reg() is a linear function
of "base_reg" and "i".

Unmask registers were the only type that didn't use sub_irq_reg() for
address calculation; thus, sub_irq_reg() is now the only method used
to obtain register addresses.

This prepares for allowing drivers to override the default sub_irq_reg
implementation if the default behavior is unsuitable.

Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
---
 drivers/base/regmap/regmap-irq.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 400c7412a7dc..4a2e1f6aa94d 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -97,7 +97,6 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
 	struct regmap *map = d->map;
 	int i, j, ret;
 	u32 reg;
-	u32 unmask_offset;
 	u32 val;
 
 	if (d->chip->runtime_pm) {
@@ -141,11 +140,11 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
 				dev_err(d->map->dev,
 					"Failed to sync unmasks in %x\n",
 					reg);
-			unmask_offset = d->chip->unmask_base -
-							d->chip->mask_base;
+
 			/* clear mask with unmask_base register */
+			reg = sub_irq_reg(d, d->chip->unmask_base, i);
 			ret = regmap_irq_update_bits(d,
-					reg + unmask_offset,
+					reg,
 					d->mask_buf_def[i],
 					d->mask_buf[i]);
 		} else {
@@ -632,7 +631,6 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 	int ret = -ENOMEM;
 	int num_type_reg;
 	u32 reg;
-	u32 unmask_offset;
 
 	if (chip->num_regs <= 0)
 		return -EINVAL;
@@ -773,10 +771,9 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 			ret = regmap_irq_update_bits(d, reg,
 					 d->mask_buf[i], ~d->mask_buf[i]);
 		else if (d->chip->unmask_base) {
-			unmask_offset = d->chip->unmask_base -
-					d->chip->mask_base;
+			reg = sub_irq_reg(d, d->chip->unmask_base, i);
 			ret = regmap_irq_update_bits(d,
-					reg + unmask_offset,
+					reg,
 					d->mask_buf[i],
 					d->mask_buf[i]);
 		} else
-- 
2.35.1