path: root/drivers
diff options
authorAndrew F. Davis <afd@ti.com>2018-01-07 17:19:09 -0600
committerMark Brown <broonie@kernel.org>2018-01-08 12:15:04 +0000
commit9bf485c955bcb707a5e679bcc74075deb0bc8531 (patch)
tree5d56a0e7983f8c374e250921fb3a7c11bceeb643 /drivers
parent4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323 (diff)
regmap: Allow empty read/write_flag_mask
All zero read and write masks in the regmap config are used to signal no special mask is needed and the bus defaults are used. In some devices all zero read/write masks are the special mask and bus defaults should not be used. To signal this a new variable is added. For example SPI often sets bit 7 in address to signal to the device a read is requested. On TI AFE44xx parts with SPI interfaces no bit needs to be set as registers are either read or write only and the operation can be determined from the address only. For this case both masks must be zero to not effect the address. Signed-off-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers')
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 8d516a9bfc01..025c62358bd6 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -769,7 +769,9 @@ struct regmap *__regmap_init(struct device *dev,
- if (config->read_flag_mask || config->write_flag_mask) {
+ if (config->read_flag_mask ||
+ config->write_flag_mask ||
+ config->zero_flag_mask) {
map->read_flag_mask = config->read_flag_mask;
map->write_flag_mask = config->write_flag_mask;
} else if (bus) {

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