x86: Add SPI slaves to PCIe SPI master?

[Alexander Stein <alexander.stein@xxxxxxxxxxxxxxxxxxxxx>]

Hi,

I have a customer board using Baytrail E3805 CPU. I want to access a chip 
attached to SPI using spidev. but for this the slave has to be attached.
This is the corresponding lspci entry:
> 00:1e.5 Serial bus controller [0c80]: Intel Corporation Atom Processor 
Z36xxx/Z37xxx Series LPIO1 SPI Controller (rev 11)
PCIe vendor and product ID is 8086:0f0e

I tried using the following entry in APCI DSDT as a subnode to the SPI device:
> Device (TAMP)
> {
>     Name (_ADR, 1)
>     Name (_CID, "SPT0001") // Dummy name for spidev
>     Method (_CRS, 0, Serialized)  // _CRS: Current Resource Settings
>     {
>         Name (UBUF, ResourceTemplate ()
>         {
>             SPISerialBus
>             (
>                 1,          //Slave select CS0 (_ADR)
>                 PolarityLow,        //Polarity of CS0 output(_DPL)
>                 FourWireMode,       //(_MOD)
>                 8,          //8-bit frame(_LEN)
>                 ControllerInitiated,    //(_SLV)
>                 2000000,       //Speed Hz (_SPE)
>                 ClockPolarityLow,  //(_POL)
>                 ClockPhaseFirst,   //(_PHA)
>                 "\\_SB.SPI1",          //Controller
>             )
>         })
>         Return (UBUF)
>     }
>     
>     Method (_STA, 0, NotSerialized)  // _STA: Status
>     {
>         Return (0x0F)
>     }
> }

Apparently this only works when the device is probed by ACPI but not when 
using PCIe (driver: pxa2xx_spi_pci). So I am wondering: How can I add a slave 
to this PCIe spi master.

Best regards,
Alexander
-- 
Dipl.-Inf. Alexander Stein
SYS TEC electronic GmbH
alexander.stein@xxxxxxxxxxxxxxxxxxxxx

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