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authorLukas Wunner <lukas@wunner.de>2019-05-09 20:03:00 +0300
committerFlorian Fainelli <f.fainelli@gmail.com>2019-06-23 05:28:34 +0300
commitcbbe883330623ba88019f8bce48af59addf7237c (patch)
tree1a7d626ec298d6933c3c16b8e72c8a059dbae139 /arch/arm/boot/dts/rk3288-veyron-mickey.dts
parente8bd76dccd792b371a934336c3e7d8c389755d9f (diff)
downloadlinux-cbbe883330623ba88019f8bce48af59addf7237c.tar.xz
ARM: bcm283x: Enable DMA support for SPI controller
Without this, the driver for the BCM2835 SPI controller uses interrupt mode instead of DMA mode, incurring a significant performance penalty. The Foundation's device tree has had these attributes for years, but for some reason they were never upstreamed. They were originally contributed by Noralf Trønnes and Martin Sperl: https://github.com/raspberrypi/linux/commit/25f3e064afc8 https://github.com/raspberrypi/linux/commit/e0edb52b47e6 The DREQ numbers 6 and 7 are documented in section 4.2.1.3 of: https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Martin Sperl <kernel@martin.sperl.org> Signed-off-by: Stefan Wahren <wahrenst@gmx.net> Cc: Martin Sperl <kernel@martin.sperl.org> Cc: Noralf Trønnes <noralf@tronnes.org>
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