Changes since v2: Remove mmap_lock_mutex. Optimize enable/disable of mmap mode. Changes since v1: Introduce API in SPI core that MTD flash driver can call for mmap read instead of directly calling spi-master driver callback. This API makes sure that SPI core msg queue is locked during mmap transfers. v1: https://lkml.org/lkml/2015/9/4/103 Cover letter: This patch series adds support for memory mapped read port of ti-qspi. ti-qspi has a special memory mapped port through which SPI flash memories can be accessed directly via SoC specific memory region. First patch adds a method to pass flash specific information like read opcode, dummy bytes etc and to request mmap read. Second patch implements mmap read method in ti-qspi driver. Patch 3 adapts m25p80 to use mmap read method before trying normal SPI transfer. Patch 4 and 5 add memory map region DT entries for DRA7xx and AM43xx SoCs. This patch series is based on the discussions here: http://www.spinics.net/lists/linux-spi/msg04796.html Tested on DRA74 EVM and AM437x-SK. Read performance increases from ~100kB/s to ~2.5MB/s. Vignesh R (5): spi: introduce mmap read support for spi flash devices spi: spi-ti-qspi: add mmap mode read support mtd: devices: m25p80: add support for mmap read request ARM: dts: DRA7: add entry for qspi mmap region ARM: dts: AM4372: add entry for qspi mmap region Documentation/devicetree/bindings/spi/ti_qspi.txt | 19 ++++- arch/arm/boot/dts/am4372.dtsi | 4 +- arch/arm/boot/dts/dra7.dtsi | 7 +- drivers/mtd/devices/m25p80.c | 5 ++ drivers/spi/spi-ti-qspi.c | 99 ++++++++++++++++++++++- drivers/spi/spi.c | 34 ++++++++ include/linux/spi/spi.h | 20 +++++ 7 files changed, 179 insertions(+), 9 deletions(-) -- 2.6.3 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
