regmap: Provide user selectable option to enable regmap

2023-07-13T15:20:28+00:00

Since apparently enabling all the KUnit tests shouldn't enable any new subsystems it is hard to enable the regmap KUnit tests in normal KUnit testing scenarios that don't enable any drivers. Add a Kconfig option to help with this and include it in the KUnit all tests config. Reviewed-by: David Gow Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20230712-regmap-kunit-enable-v1-1-13e296bd0204@kernel.org Signed-off-by: Mark Brown

regmap: REGMAP_KUNIT should not select REGMAP

2023-05-08T00:07:51+00:00

Enabling a (modular) test should not silently enable additional kernel functionality, as that may increase the attack vector of a product. Fix this by: 1. making REGMAP visible if CONFIG_KUNIT_ALL_TESTS is enabled, 2. making REGMAP_KUNIT depend on REGMAP instead of selecting it. After this, one can safely enable CONFIG_KUNIT_ALL_TESTS=m to build modules for all appropriate tests for ones system, without pulling in extra unwanted functionality, while still allowing a tester to manually enable REGMAP and its test suite on a system where REGMAP is not enabled by default. Fixes: 2238959b6ad27040 ("regmap: Add some basic kunit tests") Signed-off-by: Geert Uytterhoeven

regmap: Add some basic kunit tests

2023-03-30T11:25:47+00:00

On the theory that it's better to make a start let's add some KUnit tests for regmap. Currently this is a bit of a mess but it passes and hopefully will at some point help catch problems. We provide very basic cover for most of the core functionality that operates at the register level, repeating each test for each cache type in order to exercise the caches. There is no coverage of anything to do with the bulk operations at the bus level or formatting for byte stream buses yet. Each test creates it's own regmap since the cache structures are built incrementally, meaning we gain coverage from the different access patterns, and some of the tests cover different init scenarios. Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20230324-regmap-kunit-v2-2-b208801dc2c8@kernel.org

regmap: Add RAM backed register map

2023-03-30T11:25:42+00:00

Add a register map that is a simple array of memory, for use in KUnit testing of the framework. This is not exposed in regmap.h since I can't think of a non-test use case, it is purely for use internally. To facilitate testing we track if registers have been read or written to. Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20230324-regmap-kunit-v2-1-b208801dc2c8@kernel.org

regmap: Removed compressed cache support

2023-03-29T11:41:03+00:00

The compressed register cache support has assumptions that make it hard to cover in testing, mainly that it requires raw registers defaults be provided. Rather than either address these assumptions or leave it untested by the forthcoming KUnit tests let's remove it, the use case is quite thin and there are no current users. Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20230324-regcache-lzo-v1-1-08c5d63e2a5e@kernel.org

regmap: Add FSI bus support

2022-11-25T19:17:02+00:00

Add regmap support for the FSI bus. Signed-off-by: Eddie James Link: https://lore.kernel.org/r/20221102205148.1334459-2-eajames@linux.ibm.com Signed-off-by: Mark Brown

regmap: Add MDIO bus support

2021-05-19T13:19:10+00:00

Basic support for MDIO bus access. Support only includes clause-22 register access, with 5-bit addresses, and 16-bit wide registers. Signed-off-by: Sander Vanheule Link: https://lore.kernel.org/r/63b99a2fec2c4ea3c461d59d451af8d675ecf312.1621279162.git.sander@svanheule.net Signed-off-by: Mark Brown

regmap/SoundWire: sdw: add support for SoundWire 1.2 MBQ

2020-11-26T13:19:59+00:00

The SoundWire 1.1 specification only allowed for reads and writes of bytes. The SoundWire 1.2 specification adds a new capability to transfer "Multi-Byte Quantities" (MBQ) across the bus. The transfers still happens one-byte-at-a-time, but the update is atomic. For example when writing a 16-bit volume, the first byte transferred is only taken into account when the second byte is successfully transferred. The mechanism is symmetrical for read and writes: - On a read, the address of the last byte to be read is modified by setting the MBQ bit - On a write, the address of all but the last byte to be written are modified by setting the MBQ bit. The address for the last byte relies on the MBQ bit being cleared. The current definitions for MBQ-based controls in the SDCA draft standard are limited to 16 bits for volumes, so for now this is the only supported format. An update will be provided if and when support for 24-bit and 32-bit values is specified by the SDCA standard. One possible objection is that this code could have been handled with regmap-sdw.c. However this is a new spec addition not handled by every SoundWire 1.1 and non-SDCA device, so there's no reason to load code that will never be used. Also in practice it's extremely unlikely that CONFIG_REGMAP would not be selected with CONFIG_REGMAP_MBQ selected. However there's no functional dependency between the two modules so they can be selected separately. Reviewed-by: Rander Wang Reviewed-by: Guennadi Liakhovetski Reviewed-by: Kai Vehmanen Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao Reviewed-by: Vinod Koul Link: https://lore.kernel.org/r/20201103172226.4278-3-yung-chuan.liao@linux.intel.com Signed-off-by: Mark Brown

regmap: add Intel SPI Slave to AVMM Bus Bridge support

2020-08-26T18:46:38+00:00

This patch add support for regmap APIs that are intended to be used by the drivers of some SPI slave chips which integrate the "SPI slave to Avalon Master Bridge" (spi-avmm) IP. The spi-avmm IP acts as a bridge to convert encoded streams of bytes from the host to the chip's internal register read/write on Avalon bus. The driver implements the register read/write operations for a generic SPI master to access the sub devices behind spi-avmm bridge. Signed-off-by: Xu Yilun Signed-off-by: Wu Hao Signed-off-by: Matthew Gerlach Signed-off-by: Russ Weight Reviewed-by: Tom Rix Reviewed-by: Luis Claudio R. Goncalves Link: https://lore.kernel.org/r/1597822497-25107-2-git-send-email-yilun.xu@intel.com Signed-off-by: Mark Brown

regmap: add missing dependency on SoundWire

2020-07-08T14:27:28+00:00

CONFIG_REGMAP is not selected when no other serial bus is supported. It's largely academic since CONFIG_I2C is usually selected e.g. by DRM, but still this can break randconfig so let's be explicit. Signed-off-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20200707202628.113142-1-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown

kernel/linux.git/drivers/base/regmap/Kconfig, branch v6.6.132