Re: Help on named object in kernel

[Sudeep Holla <sudeep.holla@arm.com>]

On Wed, Jun 12, 2019 at 04:37:09PM +0000, Schmauss, Erik wrote:
> 
> 
> > -----Original Message-----
> > From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-
> > owner@vger.kernel.org] On Behalf Of Udit Kumar
> > Sent: Wednesday, June 12, 2019 4:48 AM
> > To: ACPI Devel Maling List <linux-acpi@vger.kernel.org>
> > Cc: lenb@kernel.org; Rafael J. Wysocki <rafael@kernel.org>
> > Subject: Help on named object in kernel
> > 
> > Dear ACPI experts,
> > I need your help on defining named objected in ACPI under _CRS.
> > In my firmware, I have defined two addresses for my device using
> > Memory32Fixed and QwordMemory under _CRS.
> > These  two addresses are 32-bit and 64-bit long respectively.
> > For Memory32Fixed, I gave DescriptorName name as REG0 and for
> > QwordMemory I gave DescriptorName as SATA.
> 
> Could you give us the ASL for the code snippet that you're talking about?
>

IIUC, something like below(a very rough example based on the description
above):

    Name (_CRS, ResourceTemplate (){
      QwordMemory (
        ResourceConsumer, PosDecode, MinFixed, MaxFixed, NonCacheable,
        ReadWrite, 0x0, 0x700100520, 0x700100523, 0x0, 4, , , "SATA",)
      Memory32Fixed(ReadWrite, 0x3200000, 0x10000, "REG0")
    }

Basically 2 or more entries of Memory/Address Space Resource Descriptor
which can be identified in OSPM by DescriptorName. IOW if a device has
2 sets of registers/memory/address space associated with it, instead of
relying on the order of declaration, identify them by the descriptor
name provided in ASL namespace.

--
Regards,
Sudeep