Previously, polling mode was supported as quirk for SOC without DMA. In order to use it more flexibly, it is supported when there is no dmas property in devicetree, and the issue of using excessive CPU usage in polling mode is solved by adding sleep during transfer time and supporting interrupt mode. Changes in V3. - Fix patch commit message. - Change of_find_property() to of_property_present() with code cleanup - Remove cpu_relax() related patch. - Changes use_irq variable type to bool Changes in V2. - Switched to polling mode if there is no dmas property in devicetree. - Add cpu_releax() in polling loop - Add lower limit in IRQ mode Jaewon Kim (3): spi: s3c64xx: change polling mode to optional spi: s3c64xx: add sleep during transfer spi: s3c64xx: support interrupt based pio mode drivers/spi/spi-s3c64xx.c | 81 +++++++++++++++++++---- include/linux/platform_data/spi-s3c64xx.h | 1 + 2 files changed, 70 insertions(+), 12 deletions(-) -- 2.17.1
