From: Rafał Miłecki rafal@milecki.pl
U-Boot environment variables are stored using ASCII format. One of important entries is "ethaddr" which contains base MAC address.
That NVMEM cell requires some extra processing when reading: 1. ASCII needs translating into binary MAC format 2. Final MAC needs to be calculated depending on cell index
This patchset was originally based on top of layouts implementation which sadly ended up dropped for now. To proceed I rebased it on top of the current NVMEM subsystem code. Michael's patch has applied cleanly and this approach *will not* make U-Boot env transition to layouts any harder so I believe it's fine to take those patches without waiting for layouts updated implementation.
Michael Walle (1): nvmem: core: add per-cell post processing
Rafał Miłecki (3): nvmem: core: allow nvmem_cell_post_process_t callbacks to adjust buffer dt-bindings: nvmem: u-boot,env: add MAC's #nvmem-cell-cells nvmem: u-boot-env: post-process "ethaddr" env variable
.../devicetree/bindings/nvmem/u-boot,env.yaml | 7 +++- drivers/nvmem/Kconfig | 1 + drivers/nvmem/core.c | 38 +++++++++++++++---- drivers/nvmem/imx-ocotp.c | 8 ++-- drivers/nvmem/u-boot-env.c | 25 ++++++++++++ include/linux/nvmem-provider.h | 7 +++- 6 files changed, 71 insertions(+), 15 deletions(-)