Hello Mark, This is an RFC patch series to add SPI flash support for the Exynos Chromebooks. These machines store in the flash, firmware and system parameters such as the Google Binary Block flags that controls many aspects of the system. There isn't a driver for this flash memory device so the downstream tree uses spidev to access the device from userspace (i.e: flashrom). For example, the Google Binary Block (GBB) flags can be updated with: # flashrom -p linux_spi:dev=/dev/spidev1.0 -r gbb.bin # gbb_utility -s --flags=0x39 gbb.bin # flashrom -p linux_spi:dev=/dev/spidev1.0 -w gbb.bin I took the downstream patches and posted a while ago [0] but you said that using compatible = "spidev" is wrong since is an implementation detail of Linux and does not describe the hardware [1]. By looking at a recent discussion [2] and commit [3], it seems that you agree to use spidev as long as a relevant device ID is added to the spidev OF device table. This is a RFC series though since I may missunderstood your comments. The series is composed of the following patches: Doug Anderson (1): ARM: dts: Add spidev registration to exynos5250-snow Javier Martinez Canillas (2): spi: spidev: Add Google SPI flash compatible string ARM: exynos_defconfig: Enable user mode SPI device support Simon Glass (1): ARM: dts: Add SPI flash node for Peach boards arch/arm/boot/dts/exynos5250-snow.dts | 20 ++++++++++++++++++++ arch/arm/boot/dts/exynos5420-peach-pit.dts | 26 ++++++++++++++++++++++++++ arch/arm/boot/dts/exynos5800-peach-pi.dts | 26 ++++++++++++++++++++++++++ arch/arm/configs/exynos_defconfig | 1 + drivers/spi/spidev.c | 1 + 5 files changed, 74 insertions(+) Patch #1 adds a "google,spi-flash" entry to the spidev OF ID device table. Patch #2 and #3 add as device node for the SPI flash to the Snow and Peach Chromebooks DTS. Patch #4 enables support for spidev to the exynos_defconfig. The patches have been tested on an Exynos5250 Snow and Exynos5420 Peach Pit and #1 should go through the spi tree while #2-4 through linux-samsung tree. Best regards, Javier [0]: http://lists.infradead.org/pipermail/linux-arm-kernel/2014-November/303348.html [1]: http://lists.infradead.org/pipermail/linux-arm-kernel/2014-November/304256.html [2]: https://lkml.org/lkml/2015/4/26/28 [3]: https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=956b200a846e324322f6211034c734c65a38e550 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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