Tony, On 13/07/15 10:10, Tony Lindgren wrote: > * Roger Quadros <rogerq@xxxxxx> [150710 05:26]: >> Since the Interrupt Events are used only by the NAND driver, >> there is no point in managing the Interrupt registers >> in the GPMC driver and complicating it with irqchip modeling. > > I don't think it's a good idea to allow external drivers to > tinker directly with GPMC registers. How about just set up GPMC > as an irqchip for the edge detection interrupts? > > I think we already have devices with multiple NAND chips. And > there's nothing stopping other drivers from using the edge > detection interrupts. OK. The GPMC_IRQ registers manage 2 NAND specific interrupts (terminalcount and fifo) and 'n' WAIT pin edge interrupts. So we can model this as a irqchip with 'n + 2' interrupts. We need to take care that if a GPMC chip select needs a wait pin then it can't be used as a generic interrupt. We need to get rid of omap_dev_ready() in nand/omap2.c as it accesses the GPMC_STATUS register directly. Plus it is hard coded to only monitor wait0 pin. What is the best map we should use for irqchip? Some Socs have 4 WAIT pins, some have 3 and some have 2. Should we start with 0,1,2, for the wait pins and use the next available free one for the NAND? cheers, -roger -- 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
