This patch series is a leftover of http://www.spinics.net/lists/arm-kernel/msg314242.html that missed 3.15 because it caused merge conflicts. The USART controllers on sam9x5 chips (and also all AT91/SAMA5 chips but at91rm9200) are not capable of handling DTR/DSR/DCD/RI signal. Moreover, even if the controller can handle CTS/RTS, the dedicated CTS/RTS pins may be already muxed for other peripherals (LCDC/EMAC/MMC). So this patchset adds the possibility to control those lines via GPIO, as it is done for RTS in the patch "switch atmel serial to use gpiolib" NB: The 1st patch should make it for 3.15-final since it corrects a device tree binding documentation example that has been introduced in 3.15-rc1. Patch 1: For 3.15-final: fix GPIO_ACTIVE_LOW usage in device-tree documentation. Patch 2: For 3.16: implements at91_gpiolib_get_direction used in patch 4 Patch 3: For 3.16: implements the generic helpers to control modem lines via GPIO. Patch 4: For 3.16: implements modem control lines in atmel_serial atmel_serial. Patch 5: For 3.16: implements the interrupts of CTS/DSR/DCD/RI. This is based on v3.15-rc5. Tested on at91sam9g35, with a null modem cable between 2 serial ports, one with CTS/RTS controlled by the USART controller, the other via GPIO, full duplex transfers. Did some tests also with null modem cables on a PC, and with real modems. Richard Genoud (5): tty/serial: atmel_serial: Fix device tree documentation ARM: at91: gpio: implement get_direction tty/serial: Add GPIOLIB helpers for controlling modem lines tty/serial: at91: use mctrl_gpio helpers tty/serial: at91: add interrupts for modem control lines .../devicetree/bindings/serial/atmel-usart.txt | 12 +- Documentation/serial/driver | 25 +++ arch/arm/mach-at91/at91rm9200_devices.c | 16 +- arch/arm/mach-at91/at91sam9260_devices.c | 7 - arch/arm/mach-at91/at91sam9261_devices.c | 4 - arch/arm/mach-at91/at91sam9263_devices.c | 4 - arch/arm/mach-at91/at91sam9g45_devices.c | 5 - arch/arm/mach-at91/at91sam9rl_devices.c | 5 - arch/arm/mach-at91/gpio.c | 13 ++ drivers/tty/serial/Kconfig | 4 + drivers/tty/serial/Makefile | 3 + drivers/tty/serial/atmel_serial.c | 230 ++++++++++++++++---- drivers/tty/serial/serial_mctrl_gpio.c | 143 ++++++++++++ drivers/tty/serial/serial_mctrl_gpio.h | 110 ++++++++++ include/linux/platform_data/atmel.h | 1 - 15 files changed, 509 insertions(+), 73 deletions(-) create mode 100644 drivers/tty/serial/serial_mctrl_gpio.c create mode 100644 drivers/tty/serial/serial_mctrl_gpio.h -- 1.7.10.4 -- 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
