On Mon, Nov 27, 2017 at 02:24:08AM -0800, Stephen Boyd wrote: > Some GIC configurations don't have an accessible ITS, but they > want to support MSIs through the distributor's SETSPI registers > or through the IMPLEMENTATION DEFINED message-based interrupt > request register region. This mode of operation is similar to the > v2m support on gic-400, but we don't necessarily know what > particular SPIs are supported as MSIs so we need some help from > firmware to know what to do. > > Introduce an "arm,spi-ranges" property for this, similar to the > "marvell,spi-ranges" property, that indicates the base and size > of each MSI range. This property applies equally to the > distributor and alias registers. In either case, we detect this > mode of operation by looking for a node with the "msi-controller" > property and then probe the v2m frame code on top of it. Assume > these nodes will have the "arm,spi-ranges" property in them so > that the v2m code works mostly unmodified. > > Cc: <devicetree@xxxxxxxxxxxxxxx> > Cc: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> > Cc: Marc Zyngier <marc.zyngier@xxxxxxx> > Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> > --- > .../bindings/interrupt-controller/arm,gic-v3.txt | 48 +++++++++- Acked-by: Rob Herring <robh@xxxxxxxxxx> > drivers/irqchip/irq-gic-v2m.c | 102 ++++++++++++++++----- > drivers/irqchip/irq-gic-v3.c | 4 + > include/linux/irqchip/arm-gic-common.h | 3 + > 4 files changed, 129 insertions(+), 28 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
