On Tuesday 22 March 2016 01:07 PM, Jagan Teki wrote:
Some of the SPI device drivers at drivers/spi not a real spi controllers, Unlike normal/generic SPI controllers they operates only with SPI-NOR flash devices. these were technically termed as SPI-NOR controllers, Ex: drivers/spi/fsl_qspi.cThe problem with these were resides at drivers/spi is entire SPI layer becomes SPI-NOR flash oriented which is absolutely a wrong indication where SPI layer getting effected more with flash operations - So this SPI-NOR core will resolve this issue by separating all SPI-NOR flash operations from spi layer and creats a generic layer called SPI-NOR core which can be used to interact SPI-NOR to SPI driver interface layer and the SPI-NOR controller driver. The idea is taken from Linux spi-nor framework. Before SPI-NOR: ----------------------- cmd/sf.c ----------------------- spi_flash.c ----------------------- sf_probe.c ----------------------- spi-uclass ----------------------- spi drivers ----------------------- SPI NOR chip ----------------------- After SPI-NOR: ------------------------------ cmd/sf.c ------------------------------ spi-nor.c ------------------------------- m25p80.c spi nor drivers ------------------------------- spi-uclass SPI NOR chip ------------------------------- spi drivers ------------------------------- SPI NOR chip ------------------------------- SPI-NOR with MTD: ------------------------------ cmd/sf.c ------------------------------ MTD core ------------------------------ spi-nor.c ------------------------------- m25p80.c spi nor drivers ------------------------------- spi-uclass SPI NOR chip ------------------------------- spi drivers ------------------------------- SPI NOR chip ------------------------------- drivers/mtd/spi-nor/spi-nor.c: spi-nor core drivers/mtd/spi-nor/m25p80.c: mtd uclass driver which is an interface layer b/w spi-nor core drivers/spi drivers/mtd/spi-nor/fsl_qspi.c: spi-nor controller driver(mtd uclass) Changes for v7: - Rebase to latest - Fixed git bisectable issues, with buildman. - Fixed spi-nor compilation issues - newly designed changes. Changes for v6: - Fixed git bisectable issues, with buildman. - Fixed spi-nor compilation issues - newly designed changes. Changes for v5: - newly designed changes Testing: $ git clone git://git.denx.de/u-boot-spi.git $ cd u-boot-spi $ git checkout -b spi-nor-test origin/spi-nor-test Alison Wang (1): defconfig: ls1021atwr_sdcard_qspi: Enable CONFIG_MTD
Tested in hardware and sandbox [1] Tested-by: Jagan Teki <[email protected]> [1] http://paste.ubuntu.com/15470696/ _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
