From mboxrd@z Thu Jan 1 00:00:00 1970 From: vigneshr@ti.com (Vignesh R) Date: Fri, 4 Sep 2015 13:59:57 +0530 Subject: [PATCH 0/5] Add memory mapped read support for ti-qspi Message-ID: <1441355402-6837-1-git-send-email-vigneshr@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, 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 | 18 +++- arch/arm/boot/dts/am4372.dtsi | 4 +- arch/arm/boot/dts/dra7.dtsi | 6 +- drivers/mtd/devices/m25p80.c | 8 ++ drivers/spi/spi-ti-qspi.c | 106 +++++++++++++++++++++- include/linux/spi/spi.h | 21 +++++ 6 files changed, 154 insertions(+), 9 deletions(-) -- 2.5.1