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Subject[PATCH] regmap: Add support for 12/20 register formatting
Date
From: Ricardo Ribalda <ricardo@ribalda.com>

Devices such as the AD5628 require 32 bits of data divided in 12 bits
for dummy, command and address, and 20 for data and dummy.

Signed-off-by: Ricardo Ribalda <ricardo@ribalda.com>
---
drivers/base/regmap/regmap.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index e93700af7e6e..14cdfee4c6ba 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -209,6 +209,18 @@ static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
return true;
}

+static void regmap_format_12_20_write(struct regmap *map,
+ unsigned int reg, unsigned int val)
+{
+ u8 *out = map->work_buf;
+
+ out[0] = reg >> 4;
+ out[1] = (reg << 4) | (val >> 16);
+ out[2] = val >> 8;
+ out[3] = val;
+}
+
+
static void regmap_format_2_6_write(struct regmap *map,
unsigned int reg, unsigned int val)
{
@@ -867,6 +879,16 @@ struct regmap *__regmap_init(struct device *dev,
}
break;

+ case 12:
+ switch (config->val_bits) {
+ case 20:
+ map->format.format_write = regmap_format_12_20_write;
+ break;
+ default:
+ goto err_hwlock;
+ }
+ break;
+
case 8:
map->format.format_reg = regmap_format_8;
break;
--
2.28.0
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