F_MEM_ADDR_WIDTH
ret = regmap_field_write(i2c->fields[F_MEM_ADDR_WIDTH], len);
[F_MEM_ADDR_WIDTH] = MST_REG_FIELD(RTL9300_I2C_MST_CTRL2, 2, 3),
[F_MEM_ADDR_WIDTH] = MST_REG_FIELD(RTL9310_I2C_MST_CTRL, 9, 10),
[F_MEM_ADDR_WIDTH] = MST_REG_FIELD(RTL9607_I2C_CONFIG, 12, 13),