This adds support for the nvmem-cells properties cropping up in manyb device trees. This is an easy way to load configuration, version information, or calibration data from a non-volatile memory source. For more information, refer to patch 6 ("misc: Add support for nvmem cells").
For the moment I have only added some integration tests using the ethernet addresses. This hits the main code paths (looking up nvmem cells) but doesn't test writing. I can add a few stand-alone tests if desired.
CI: https://dev.azure.com/u-boot/u-boot/_build/results?buildId=4167&view=res...
The patches are structured in the following manner: 1-9: These are general cleanups, and may be applied independently of the rest of the series. 10-12: Add NVMEM support 13-15: Support reading ethernet addresses using the NVMEM API and add some tests. 16: Example demonstrating how this series could be reworked to be a uclass. It should not be applied.
Changes in v4: - Fix dm_test_alias_highest_id test failing because we changed the number of aliases - Fix segmentation fault if DSA master fails to probe - Add fallbacks for i2c_eeprom_* functions. This fixes build errors if CONFIG_I2C_EEPROM was not enabled. - Fix failing to find nvmem devices if some supported uclasses were not enabled. - Remove typedefs from documentation - Document some of the design background, and why a new uclass was not created. - Enable CONFIG_NVMEM for sandbox_spl_defconfig - Enable CONFIG_I2C_EEPROM for sandbox_spl_defconfig - Add RFC patch illustrating how this series could be reworked to use a more conventional, uclass-based approach.
Changes in v3: - Add aliases for ethernet devices - Add mac address for eth8 to environment - Move patch adding test earlier in the series - Add test for eth8 as well
Changes in v2: - Call the appropriate API functions directly from nvmem_cell_(read|write). This means we can drop the nvmem_interface machinery.
Sean Anderson (16): sandbox: net: Add aliases for ethernet devices sandbox: net: Add mac address for eth8 to environment test: eth: Add test for ethernet addresses sandbox: net: Remove fake-host-hwaddr sandbox: Remove eth2addr from environment sandbox: Move some mac addresses to device tree net: dsa: Fix segmentation fault if master fails to probe misc: i2c_eeprom: Make i2c_eeprom_write use a const buf misc: i2c_eeprom: Add fallbacks misc: Add support for nvmem cells sandbox: Enable NVMEM net: Add support for reading mac addresses from nvmem cells test: Load mac address with i2c eeprom test: Load mac address using RTC test: Load mac address using misc device [RFC] misc: nvmem: Convert to using udevices
MAINTAINERS | 7 ++ arch/sandbox/dts/sandbox.dts | 1 - arch/sandbox/dts/sandbox64.dts | 1 - arch/sandbox/dts/test.dts | 34 +++++- board/sandbox/sandbox.env | 4 - configs/sandbox64_defconfig | 1 + configs/sandbox_defconfig | 1 + configs/sandbox_flattree_defconfig | 1 + configs/sandbox_noinst_defconfig | 1 + configs/sandbox_spl_defconfig | 3 + doc/api/index.rst | 1 + doc/api/nvmem.rst | 7 ++ drivers/misc/Kconfig | 16 +++ drivers/misc/Makefile | 1 + drivers/misc/i2c_eeprom.c | 40 ++++++- drivers/misc/i2c_eeprom_emul.c | 4 + drivers/misc/misc-uclass.c | 58 ++++++++- drivers/misc/misc_sandbox.c | 3 + drivers/misc/nvmem.c | 106 +++++++++++++++++ drivers/net/sandbox.c | 10 +- drivers/rtc/i2c_rtc_emul.c | 10 ++ drivers/rtc/rtc-uclass.c | 46 ++++++- include/dm/uclass-id.h | 1 + include/i2c_eeprom.h | 27 ++++- include/nvmem.h | 185 +++++++++++++++++++++++++++++ net/dsa-uclass.c | 6 +- net/eth-uclass.c | 13 +- test/dm/eth.c | 29 +++++ test/dm/test-fdt.c | 2 +- 29 files changed, 584 insertions(+), 35 deletions(-) create mode 100644 doc/api/nvmem.rst create mode 100644 drivers/misc/nvmem.c create mode 100644 include/nvmem.h