>
> Both DT and ACPI provide means to assign GPIOs to devices. We can then
> use Linux APIs to query those. For example getting GPIO with name
> "reset" is done like:
>
> struct gpio_desc *reset_desc;
>
> reset_desc = gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
>
> This will retrieve the GPIO using firmware description (ACPI, DT) if
> available. No need to deal with the GPIO numbers.
Hi Mika,
Thanks for reply,
But how then to obtain gpio name or if it is possible the list of all
available names?
For example decoded ACPI DSDT shows the following:
how to get gpio name for mentioned in your reply function?
Does it according below DSDT should be "GPO1" or "INT33FC" or something other?
Kind regards,
Serge Kolotylo.
Device (TCS5)
{
Name (_ADR, Zero) // _ADR: Address
Name (_HID, "CHPN0001") // _HID: Hardware ID
Name (_CID, "PNP0C50" /* HID Protocol Device (I2C bus)
*/) // _CID: Compatible ID
Name (_S0W, Zero) // _S0W: S0 Device Wake State
Name (_DEP, Package (0x02) // _DEP: Dependencies
{
GPO1,
I2C5
})
Method (_PS3, 0, Serialized) // _PS3: Power State 3
{
}
Method (_PS0, 0, Serialized) // _PS0: Power State 0
{
If ((^^^GPO1.AVBL == One))
{
^^^GPO1.TCD3 = Zero
}
Sleep (0x05)
If ((^^^I2C5.PMI1.AVBG == One))
{
^^^I2C5.PMI1.TCON = One
}
Sleep (0x1E)
If ((^^^GPO1.AVBL == One))
{
^^^GPO1.TCD3 = One
}
Sleep (0x78)
}
and GPO1 descr
Device (GPO1)
{
Name (_ADR, Zero) // _ADR: Address
Name (_HID, "INT33FC" /* Intel Baytrail GPIO Controller
*/) // _HID: Hardware ID
Name (_CID, "INT33FC" /* Intel Baytrail GPIO Controller
*/) // _CID: Compatible ID
Name (_DDN, "ValleyView GPNCORE controller") // _DDN: DOS
Device Name
Name (_UID, 0x02) // _UID: Unique ID
Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings
{
Name (RBUF, ResourceTemplate ()
{
Memory32Fixed (ReadWrite,
0xFED0D000, // Address Base
0x00001000, // Address Length
)
Interrupt (ResourceConsumer, Level, ActiveLow, Shared, ,, )
{
0x00000030,
}
})
Return (RBUF) /* \_SB_.GPO1._CRS.RBUF */
}
Name (AVBL, Zero)
Method (_REG, 2, NotSerialized) // _REG: Region Availability
{
If ((Arg0 == 0x08))
{
AVBL = Arg1
}
}
OperationRegion (GPOP, GeneralPurposeIo, Zero, 0x0C)
Field (GPOP, ByteAcc, NoLock, Preserve)
{
Connection (
GpioIo (Exclusive, PullDefault, 0x0000, 0x0000,
IoRestrictionOutputOnly,
"\\_SB.GPO1", 0x00, ResourceConsumer, ,
)
{ // Pin list
0x000F
}
),
BST5, 1,
Connection (
GpioIo (Exclusive, PullDefault, 0x0000, 0x0000,
IoRestrictionOutputOnly,
"\\_SB.GPO1", 0x00, ResourceConsumer, ,
)
{ // Pin list
0x001A
}
),
TCD3, 1
}
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