en Copyright 2015 Java http://172.16.0.5:8080/history/linux-6.15/Documentation/ABI/stable/sysfs-driver-aspeed-vuart#8d310c91 drivers/tty/serial/8250: Make Aspeed VUART SIRQ polarity configurableMake the SIRQ polarity for Aspeed AST24xx/25xx VUART configurable viasysfs. This setting need to be changed on specific host platformsdepending on the selected host interface (LPC / eSPI).The setting is configurable via sysfs rather than device-tree to stay inline with other related configurable settings.On AST2500 the VUART SIRQ polarity can be auto-configured by reading abit from a configuration register, e.g. the LPC/eSPI interfaceconfiguration bit.Tested: Verified on TYAN S7106 mainboard.Signed-off-by: Oskar Senft <osk@google.com>Link: https://lore.kernel.org/r/20190905144130.220713-1-osk@google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> List of files: /linux-6.15/Documentation/ABI/stable/sysfs-driver-aspeed-vuart Thu, 05 Sep 2019 14:41:28 +0000 Oskar Senft <osk@google.com> http://172.16.0.5:8080/history/linux-6.15/Documentation/ABI/stable/sysfs-driver-aspeed-vuart#7fbcf3af drivers/serial: Add driver for Aspeed virtual UARTThis change adds a driver for the 16550-based Aspeed virtual UARTdevice. We use a similar process to the of_serial driver for deviceprobe, but expose some VUART-specific functions through sysfs too.The VUART is two UART 'front ends' connected by their FIFO (no actualserial line in between). One is on the BMC side (management controller)and one is on the host CPU side.This driver is for the BMC side. The sysfs files allow the BMCuserspace, which owns the system configuration policy, to specify atwhat IO port and interrupt number the host side will appear to the hoston the Host <-> BMC LPC bus. It could be different on a different system(though most of them use 3f8/4).OpenPOWER host firmware doesn't like it when the host-side of theVUART's FIFO is not drained. This driver only disables host TX discardmode when the port is in use. We set the VUART enabled bit when we bindto the device, and clear it on unbind.We don't want to do this on open/release, as the host may be using thisbit to configure serial output modes, which is independent of whetherthe devices has been opened by BMC userspace.Signed-off-by: Jeremy Kerr <jk@ozlabs.org>Signed-off-by: Joel Stanley <joel@jms.id.au>Acked-by: Rob Herring <robh@kernel.org>Reviewed-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> List of files: /linux-6.15/Documentation/ABI/stable/sysfs-driver-aspeed-vuart Tue, 02 May 2017 07:45:43 +0000 Jeremy Kerr <jk@ozlabs.org>