user/sven/linux.git/drivers/base/regmap/regmap.c, branch v4.19.121

regmap: fix bulk writes on paged registers

2019-07-26T07:14:06Z

[ Upstream commit db057679de3e9e6a03c1bcd5aee09b0d25fd9f5b ] On buses like SlimBus and SoundWire which does not support gather_writes yet in regmap, A bulk write on paged register would be silently ignored after programming page. This is because local variable 'ret' value in regmap_raw_write_impl() gets reset to 0 once page register is written successfully and the code below checks for 'ret' value to be -ENOTSUPP before linearising the write buffer to send to bus->write(). Fix this by resetting the 'ret' value to -ENOTSUPP in cases where gather_writes() is not supported or single register write is not possible. Signed-off-by: Srinivas Kandagatla Signed-off-by: Mark Brown Signed-off-by: Sasha Levin

regmap: Add regmap_noinc_read API

2018-08-09T10:00:15Z

The regmap API usually assumes that bulk read operations will read a range of registers but some I2C/SPI devices have certain registers for which a such a read operation will return data from an internal FIFO instead. Add an explicit API to support bulk read without range semantics. Some linux drivers use regmap_bulk_read or regmap_raw_read for such registers, for example mpu6050 or bmi150 from IIO. This only happens to work because when caching is disabled a single regmap read op will map to a single bus read op (as desired). This breaks if caching is enabled and reg+1 happens to be a cacheable register. Without regmap support refactoring a driver to enable regmap caching requires separate I2C and SPI paths. This is exactly what regmap is supposed to help avoid. Suggested-by: Jonathan Cameron Signed-off-by: Crestez Dan Leonard Signed-off-by: Stefan Popa Signed-off-by: Mark Brown

Merge remote-tracking branches 'regmap/topic/debugfs' and 'regmap/topic/mmio-clk' into regmap-next

2018-03-12T16:50:42Z

Merge remote-tracking branch 'regmap/topic/bulk' into regmap-next

2018-03-12T16:50:40Z

Merge remote-tracking branches 'regmap/fix/i2c' and 'regmap/fix/volatile' into regmap-linus

2018-03-12T16:50:35Z

Merge remote-tracking branch 'regmap/fix/core' into regmap-linus

2018-03-12T16:50:32Z

regmap: Merge redundant handling in regmap_bulk_write

2018-02-26T11:00:34Z

The handling for the first two cases in regmap_bulk_write is essentially identical. The first case is just a better implementation of the second, supporting 8 byte registers and doing the locking manually to avoid bouncing the lock for each register. Drop some redundant code by removing the second of these cases and allowing both situations to be handled by the same code. Signed-off-by: Charles Keepax Signed-off-by: Mark Brown

regmap: Tidy up regmap_raw_write chunking code

2018-02-26T11:00:33Z

Raw writes may need to be split into small chunks if max_raw_write is set. Tidy up the code implementing this, the new code is slightly clearer, slightly shorter and slightly more efficient. Signed-off-by: Charles Keepax Signed-off-by: Mark Brown

regmap: Move the handling for max_raw_write into regmap_raw_write

2018-02-26T11:00:32Z

Currently regmap_bulk_write will split a write into chunks before calling regmap_raw_write if max_raw_write is set. It is more logical for this handling to be inside regmap_raw_write itself, as this removes the need to keep re-implementing the chunking code, which would be the same for all users of regmap_raw_write. Signed-off-by: Charles Keepax Signed-off-by: Mark Brown

regmap: Remove unnecessary printk for failed allocation

2018-02-26T11:00:31Z

Signed-off-by: Charles Keepax Signed-off-by: Mark Brown