On Tue 30 Jan 08:17 PST 2018, Lina Iyer wrote: > On Mon, Jan 29 2018 at 19:08 +0000, Rob Herring wrote: > > On Thu, Jan 18, 2018 at 03:28:02PM -0700, Lina Iyer wrote: [..] > > > diff --git a/Documentation/devicetree/bindings/arm/msm/cmd-db.txt b/Documentation/devicetree/bindings/arm/msm/cmd-db.txt [..] > > > +Command DB is a database that provides a mapping between resource key and the > > > +resource address for a system resource managed by a remote processor. The data > > > +is stored in a shared memory region and is loaded by the remote processor. > > > > Is said shared memory described in DT. If so, this should be a child > > node. Only 8 bytes seems kind of fine grained for putting in DT when it > > could be implied by the parent shared memory node. > > > I dont believe this memory will be described in DT for this chipset. > Will ask internally. > Well, these things goes two ways... > > > + > > > +Some of the Qualcomm Technologies Inc SoC's have hardware accelerators for > > > +controlling shared resources. Depending on the board configuration the shared > > > +resource properties may change. These properties are dynamically probed by the > > > +remote processor and made available in the shared memory. > > > > The table may change, but does the presence of it or shared memory > > location (of the pointer) change? > > > The location may change between different SoCs, but will be present in > all chipsets of this architecture. > Where is the actual DB located? System RAM or is it some special device-memory? Regards, Bjorn -- 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
