regmap: if format_write is used, declare all registers as "unreadable"

Using .format_write means, we have a custom function to write to the
chip, but not to read back. Also, mark registers as "not precious" and
"not volatile" which is implicit because we cannot read them. Make those
functions use 'regmap_readable' to reuse the checks done there.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 3c34526091da9d54b60845ce3ba9be8e7b1ec10a..b7198f57b69c048c3d2c66172892e796b82328bc 100644 (file)
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -36,6 +36,9 @@ bool regmap_readable(struct regmap *map, unsigned int reg)
        if (map->max_register && reg > map->max_register)
                return false;
 
+       if (map->format.format_write)
+               return false;
+
        if (map->readable_reg)
                return map->readable_reg(map->dev, reg);
 
@@ -44,7 +47,7 @@ bool regmap_readable(struct regmap *map, unsigned int reg)
 
 bool regmap_volatile(struct regmap *map, unsigned int reg)
 {
-       if (map->max_register && reg > map->max_register)
+       if (!regmap_readable(map, reg))
                return false;
 
        if (map->volatile_reg)
@@ -55,7 +58,7 @@ bool regmap_volatile(struct regmap *map, unsigned int reg)
 
 bool regmap_precious(struct regmap *map, unsigned int reg)
 {
-       if (map->max_register && reg > map->max_register)
+       if (!regmap_readable(map, reg))
                return false;
 
        if (map->precious_reg)