regmap: Updates for v5.18

A couple of small fixes, plus some new features that enable us to handle
 devices that reformat register addresses depending on the bus used to
 handle the control interface more gracefully.
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Merge tag 'regmap-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap updates from Mark Brown:
 "A couple of small fixes, plus some new features that enable us to
  handle devices that reformat register addresses depending on the bus
  used to handle the control interface more gracefully"

* tag 'regmap-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: allow a defined reg_base to be added to every address
  regmap: add configurable downshift for addresses
  regmap: irq: cleanup comments
  regmap-irq: Fix typo in comment

drivers/base/regmap/internal.h

@@ -31,6 +31,7 @@ struct regmap_format {
 	size_t buf_size;
 	size_t reg_bytes;
 	size_t pad_bytes;
+	size_t reg_downshift;
 	size_t val_bytes;
 	void (*format_write)(struct regmap *map,
 			     unsigned int reg, unsigned int val);
@@ -62,6 +63,7 @@ struct regmap {
 	regmap_unlock unlock;
 	void *lock_arg; /* This is passed to lock/unlock functions */
 	gfp_t alloc_flags;
+	unsigned int reg_base;
 
 	struct device *dev; /* Device we do I/O on */
 	void *work_buf;     /* Scratch buffer used to format I/O */

drivers/base/regmap/regmap-irq.c

@@ -535,7 +535,7 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
 
 	/*
 	 * Ignore masked IRQs and ack if we need to; we ack early so
-	 * there is no race between handling and acknowleding the
+	 * there is no race between handling and acknowledging the
 	 * interrupt.  We assume that typically few of the interrupts
 	 * will fire simultaneously so don't worry about overhead from
 	 * doing a write per register.
@@ -1045,7 +1045,7 @@ int devm_regmap_add_irq_chip_fwnode(struct device *dev,
 EXPORT_SYMBOL_GPL(devm_regmap_add_irq_chip_fwnode);
 
 /**
- * devm_regmap_add_irq_chip() - Resource manager regmap_add_irq_chip()
+ * devm_regmap_add_irq_chip() - Resource managed regmap_add_irq_chip()
  *
  * @dev: The device pointer on which irq_chip belongs to.
  * @map: The regmap for the device.
@@ -1074,7 +1074,7 @@ EXPORT_SYMBOL_GPL(devm_regmap_add_irq_chip);
 /**
  * devm_regmap_del_irq_chip() - Resource managed regmap_del_irq_chip()
  *
- * @dev: Device for which which resource was allocated.
+ * @dev: Device for which the resource was allocated.
  * @irq: Primary IRQ for the device.
  * @data: &regmap_irq_chip_data allocated by regmap_add_irq_chip().
  *

drivers/base/regmap/regmap.c

@@ -821,8 +821,11 @@ struct regmap *__regmap_init(struct device *dev,
 	else
 		map->alloc_flags = GFP_KERNEL;
 
+	map->reg_base = config->reg_base;
+
 	map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
 	map->format.pad_bytes = config->pad_bits / 8;
+	map->format.reg_downshift = config->reg_downshift;
 	map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
 	map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
 			config->val_bits + config->pad_bits, 8);
@@ -1735,6 +1738,8 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
 			return ret;
 	}
 
+	reg += map->reg_base;
+	reg >>= map->format.reg_downshift;
 	map->format.format_reg(map->work_buf, reg, map->reg_shift);
 	regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
 				      map->write_flag_mask);
@@ -1905,6 +1910,8 @@ static int _regmap_bus_formatted_write(void *context, unsigned int reg,
 			return ret;
 	}
 
+	reg += map->reg_base;
+	reg >>= map->format.reg_downshift;
 	map->format.format_write(map, reg, val);
 
 	trace_regmap_hw_write_start(map, reg, 1);
@@ -2346,6 +2353,8 @@ static int _regmap_raw_multi_reg_write(struct regmap *map,
 		unsigned int reg = regs[i].reg;
 		unsigned int val = regs[i].def;
 		trace_regmap_hw_write_start(map, reg, 1);
+		reg += map->reg_base;
+		reg >>= map->format.reg_downshift;
 		map->format.format_reg(u8, reg, map->reg_shift);
 		u8 += reg_bytes + pad_bytes;
 		map->format.format_val(u8, val, 0);
@@ -2673,6 +2682,8 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 			return ret;
 	}
 
+	reg += map->reg_base;
+	reg >>= map->format.reg_downshift;
 	map->format.format_reg(map->work_buf, reg, map->reg_shift);
 	regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
 				      map->read_flag_mask);

include/linux/regmap.h

@@ -237,6 +237,10 @@ typedef void (*regmap_unlock)(void *);
  * @reg_stride: The register address stride. Valid register addresses are a
  *              multiple of this value. If set to 0, a value of 1 will be
  *              used.
+ * @reg_downshift: The number of bits to downshift the register before
+ *		   performing any operations.
+ * @reg_base: Value to be added to every register address before performing any
+ *	      operation.
  * @pad_bits: Number of bits of padding between register and value.
  * @val_bits: Number of bits in a register value, mandatory.
  *
@@ -360,6 +364,8 @@ struct regmap_config {
 
 	int reg_bits;
 	int reg_stride;
+	int reg_downshift;
+	unsigned int reg_base;
 	int pad_bits;
 	int val_bits;