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mtd: nand: Cleanup/rework the atmel_nand driver
This is a complete rewrite of the driver whose main purpose is to support the new DT representation where the NAND controller node is now really visible in the DT and appears under the EBI bus. With this new representation, we can add other devices under the EBI bus without risking pinmuxing conflicts (the NAND controller is under the EBI bus logic and as such, share some of its pins with other devices connected on this bus). Even though the goal of this rework was not necessarily to add new features, the new driver has been designed with this in mind. With a clearer separation between the different blocks and different IP revisions, adding new functionalities should be easier (we already have plans to support SMC timing configuration so that we no longer have to rely on the configuration done by the bootloader/bootstrap). Also note that we no longer have a custom ->cmdfunc() implementation, which means we can now benefit from new features added in the core implementation for free (support for new NAND operations for example). The last thing that we gain with this rework is support for multi-chips and multi-dies chips, thanks to the clean NAND controller <-> NAND devices representation. During this transition we also dropped support for AVR32 SoCs which should soon disappear from mainline (removal of the AVR32 arch is planned for 4.12). This new driver has been tested on several platforms (at91sam9261, at91sam9g45, at91sam9x5, sama5d3 and sama5d4) to make sure it did not introduce regressions, and it's worth mentioning that old bindings are still supported (which partly explain the positive diffstat). Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
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