[Please CC me, I'm not on the list] Hi, I need a driver for the Exar's XR20M1280 SPI-based serial port. It's a 16C950 compatible serial port, it just performs the register accesses over an SPI (or I2C) bus rather than memory-mapped. As far as I can determine, no driver for such a device exists yet. So I'll develop one. A few questions before I start: - I guess I should preferably write it as generically as possible, even though I can test it on only one device? - Should I add a UPIO_SPI to the global I/O types, or should I override the serial_in/serial_out functions in struct plat_serial8250_port? - I guess there should be a 8250_spi file that registers the platform device? - I guess it doesn't make sense to try autoconfig_irq for such a device? The IRQ is typically a gpio which the platform code has to configure as an IRQ. - I'm not sure how to set the uartclk. The XR20M1280's BRG is derived from a 24MHz clock, but other devices or other boards may have different values. Should it be part of platform data? Should I define a new platform data struct for that? Any other suggestions are also welcome. Regards, Arnout -- Arnout Vandecappelle arnout at mind be Senior Embedded Software Architect +32-16-286540 Essensium/Mind http://www.mind.be G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle GPG fingerprint: 7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
