[PATCH 1/1] regmap: Add support for continously numbered pages across regmap range

[Mukund Navada]

  Page number in some devices increases across regmap ranges since the
selector register to choose the page remains the same. So in order to
write correct page number, the start_page_num is stored in
regmap_range_cfg.

Signed-off-by: Mukund Navada <navada@xxxxxx>
---
 drivers/base/regmap/internal.h |    2 ++
 drivers/base/regmap/regmap.c   |    2 ++
 include/linux/regmap.h         |    5 +++++
 3 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 288e135..fd31f5d 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -134,6 +134,8 @@ struct regmap_range_node {
 
 	unsigned int window_start;
 	unsigned int window_len;
+
+	unsigned int start_page_num;
 };
 
 #ifdef CONFIG_DEBUG_FS
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 42d5cb0..39e37a4 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -645,6 +645,7 @@ struct regmap *regmap_init(struct device *dev,
 		new->selector_shift = range_cfg->selector_shift;
 		new->window_start = range_cfg->window_start;
 		new->window_len = range_cfg->window_len;
+		new->start_page_num = range_cfg->start_page_num;
 
 		if (_regmap_range_add(map, new) == false) {
 			dev_err(map->dev, "Failed to add range %d\n", i);
@@ -833,6 +834,7 @@ static int _regmap_select_page(struct regmap *map, unsigned int *reg,
 
 	win_offset = (*reg - range->range_min) % range->window_len;
 	win_page = (*reg - range->range_min) / range->window_len;
+	win_page += range->start_page_num;
 
 	if (val_num > 1) {
 		/* Bulk write shouldn't cross range boundary */
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index b7e95bf..96f029e 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -217,6 +217,8 @@ struct regmap_config {
  *
  * @window_start: Address of first (lowest) register in data window.
  * @window_len: Number of registers in data window.
+ *
+ * @start_page_num: Start page number for the range
  */
 struct regmap_range_cfg {
 	const char *name;
@@ -233,6 +235,9 @@ struct regmap_range_cfg {
 	/* Data window (per each page) */
 	unsigned int window_start;
 	unsigned int window_len;
+
+	/* Starting page number when it increases across range */
+	unsigned int start_page_num;
 };
 
 typedef int (*regmap_hw_write)(void *context, const void *data,
-- 
1.7.1

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