Messages in this thread Patch in this message | | | From | Ricardo Ribalda <> | Subject | [PATCH v2] regmap: Add support for 12/20 register formatting | Date | Thu, 17 Sep 2020 13:47:27 +0200 |
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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. Eg:
XXXXCCCCAAAADDDDDDDDDDDDDDDDXXXX
Where X is dont care, C is command, A is address and D is data bits.
Which would requierd the following regmap_config:
static const struct regmap_config config_dac = { .reg_bits = 12, .val_bits = 20, .max_register = 0xff, };
Signed-off-by: Ricardo Ribalda <ribalda@kernel.org> --- 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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