NVIDIA Tegra20 SFLASH controller.Required properties:- compatible : should be "nvidia,tegra20-sflash".- reg: Should contain SFLASH registers location and length.- interrupts: Should contain SFLASH interrupts.- nvidia,dma-request-selector : The Tegra DMA controller's phandle and request selector for this SFLASH controller.Recommended properties:- spi-max-frequency: Definition as per Documentation/devicetree/bindings/spi/spi-bus.txtExample: