[PATCH 11/20] regmap: _regmap_raw_read: Add handling of busses without bus->read()

[Markus Pargmann]

Handle easy reads by using bus->reg_read(). Return with an error value
if a read is requested that can not be handled with reg_read().

Signed-off-by: Markus Pargmann <m...@pengutronix.de>
---
 drivers/base/regmap/regmap.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 87f15fb60bc5..3b663350c573 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2071,6 +2071,21 @@ static int _regmap_raw_read(struct regmap *map, unsigned 
int reg, void *val,
 
        WARN_ON(!map->bus);
 
+       /*
+        * There are busses that do not have a read function as it is optional.
+        * Use their reg_read function instead if the requested number of bytes
+        * is correct.
+        */
+       if (!map->bus->read) {
+               /*
+                * bus_reg_read() does not support reading values that are not
+                * exactly the size of format.val_bytes
+                */
+               if (val_len != map->format.val_bytes)
+                       return -EINVAL;
+               return _regmap_bus_reg_read(map, reg, val);
+       }
+
        range = _regmap_range_lookup(map, reg);
        if (range) {
                ret = _regmap_select_page(map, &reg, range,
-- 
2.4.6

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