This patchset improves polling mode of s3c64xx driver. s3cx64xx driver was supporing polling mode using quirk for SOC without DMA. However there are situations in which spi polling mode should be supported in some environments. To solve this situation, polling mode can be used selectively by using device-tree as well as quirk. When using the existing polling mode, the CPU utilization goes up to 100% becuase it checks register too frequently. In order to improve this problem, IRQ is used by using the FIFO Trigger Level function. Jaewon Kim (3): spi: s3c64xx: support spi polling mode using devicetree spi: dt-bindings: samsung: add samsung,spi-polling property spi: s3c64xx: support interrupt based pio mode .../devicetree/bindings/spi/samsung,spi.yaml | 6 ++ drivers/spi/spi-s3c64xx.c | 77 ++++++++++++++++--- include/linux/platform_data/spi-s3c64xx.h | 1 + 3 files changed, 72 insertions(+), 12 deletions(-) -- 2.17.1
