[PATCH 10/20] regmap: _regmap_raw_multi_reg_write: Add reg_write() support

Markus Pargmann
2015-08-12T10:20:01Z

Define a fallback for busses which do not define a write() function.
Instead we write one register at a time using reg_write().

Without this patch, _regmap_raw_multi_reg_write would break as it tries
to call bus->write() without checking if it exists before.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---
drivers/base/regmap/regmap.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 78eb96288a68..87f15fb60bc5 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1778,6 +1778,20 @@ static int _regmap_raw_multi_reg_write(struct regmap *map,
if (!len)
return -EINVAL;

+ /*
+ * If bus->write is not supported we have to use reg_write for each
+ * register value.
+ */
+ if (!map->bus->write) {
+ for (i = 0; i < num_regs; i++) {
+ ret = map->reg_write(map, regs[i].reg, regs[i].def);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+ }
+
buf = kzalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
--
2.4.6