misc/bt-host: Add Aspeed BT IPMI host driver

2015-11-18T04:13:09+00:00

This patch adds a simple device driver to expose the iBT interface on Aspeed chips as a character device (/dev/bt). Plus various fixes from jk: - Fix compile warnings. We have a bunch of unused functions. - Remove unused members of struct bt_host - Fix whitespace issues - Use explicit u8 type for bt registers to avoid any issues with signed vs unsigned types. - Remove chrdev_region, use module_platform_driver - Unify device name to bt-host - Use a more explicit compatible string. The interface we're using here is specific to the aspeed hardware implementation. - Use a dynamic miscdev; no need to use a global miscdev here. - Avoid global bt_host. Rather than having a global bt_host, use references from the file & miscdev. This removes the restriction on the number of bt-host devices. - Add ioctl to assert SMS_ATN - Remove bt_host->ctrl, nothing uses it. - Read bt ctrl state after poll_wait - Fix unit address for ibt - Add facility for interrupt-driven BT messages. This change adds a facility for the bt-host driver to use interrupts rather than polling via a timer. If we find an interrupts property in the device tree, we'll enable interrupts on the bt device. - Use devm_ioremap_resource(). No need to unpack struct resource, and we don't need ioremap_uncached here. Signed-off-by: Alistair Popple Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley

BMC/Intel-BMC/linux.git/drivers/misc/bt-host.c, branch dev-4.3

misc/bt-host: Add Aspeed BT IPMI host driver