From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Fri, 16 Sep 2016 13:55:18 +0200 Subject: [PATCH v2 1/3] ipmi: add an Aspeed BT IPMI BMC driver In-Reply-To: <1474022367-21029-2-git-send-email-clg@kaod.org> References: <1474022367-21029-1-git-send-email-clg@kaod.org> <1474022367-21029-2-git-send-email-clg@kaod.org> Message-ID: <2571846.lBvYOIiu5M@wuerfel> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Friday, September 16, 2016 12:39:25 PM CEST C?dric Le Goater wrote: > From: Alistair Popple > > This patch adds a simple device driver to expose the iBT interface on > Aspeed SOCs (AST2400 and AST2500) as a character device. Such SOCs are > commonly used as BMCs (BaseBoard Management Controllers) and this > driver implements the BMC side of the BT interface. > > The BT (Block Transfer) interface is used to perform in-band IPMI > communication between a host and its BMC. Entire messages are buffered > before sending a notification to the other end, host or BMC, that > there is data to be read. Usually, the host emits requests and the BMC > responses but the specification provides a mean for the BMC to send > SMS Attention (BMC-to-Host attention or System Management Software > attention) messages. > > For this purpose, the driver introduces a specific ioctl on the > device: 'BT_BMC_IOCTL_SMS_ATN' that can be used by the system running > on the BMC to signal the host of such an event. > > The device name defaults to '/dev/ipmi-bt-host' > > Signed-off-by: Alistair Popple > Signed-off-by: Jeremy Kerr > Signed-off-by: Joel Stanley > Acked-by: Arnd Bergmann