Hi Stephen, On 25 July 2016 at 13:57, Stephen Warren <swar...@wwwdotorg.org> wrote: > On 07/22/2016 08:08 PM, Simon Glass wrote: >> >> Hi Stephen, >> >> On 18 July 2016 at 12:17, Stephen Warren <swar...@wwwdotorg.org> wrote: >>> >>> From: Stephen Warren <swar...@nvidia.com> >>> >>> IVC (Inter-VM Communication) protocol is a Tegra-specific IPC (Inter >>> Processor Communication) framework. Within the context of U-Boot, it is >>> typically used for communication between the main CPU and various >>> auxiliary processors. In particular, it will be used to communicate with >>> the BPMP (Boot and Power Management Processor) on Tegra186 in order to >>> manipulate clocks and reset signals. >>> >>> Signed-off-by: Stephen Warren <swar...@nvidia.com> >>> --- >>> This depends on "ARM: tegra: unify Tegra186 Makefile a bit" (which I just >>> sent) purely for a tiny bit of diff context in the Makefile. Otherwise, >>> it's entirely independent. >>> >>> arch/arm/include/asm/arch-tegra/ivc.h | 179 +++++++++++ >>> arch/arm/mach-tegra/Kconfig | 9 + >>> arch/arm/mach-tegra/Makefile | 1 + >>> arch/arm/mach-tegra/ivc.c | 553 >>> ++++++++++++++++++++++++++++++++++ >>> 4 files changed, 742 insertions(+) >>> create mode 100644 arch/arm/include/asm/arch-tegra/ivc.h >>> create mode 100644 arch/arm/mach-tegra/ivc.c >> >> >> Can this use driver model? It seems different from remoteproc. Maybe >> mailbox or blk? > > > This code is essentially utility/implementation code that will be called > from a "DM-enabled" driver. The BPMP driver will be instantiated from DT > like any other device, and will "host"/use an IVC channel, hence call the > IVC code. >
If you take a look at the cros_ec driver you can see that it has a similar interface. There is a command which allows you to perform various operations on the device. A few drivers sit on top of this device (keyboard, i2c tunnel). This allows debugging and better visibility into the device. What do you think? Regards, Simon _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
