RE: How to add the "gpio-line-names" property in a PCI gpio expander

[Flavio Suligoi <f.suligoi@xxxxxxx>]

Hi Mika and Andy,

> >
> > root@debian:~# lspci -t
> > -[0000:00]-+-00.0
> >            +-02.0
> >            +-0e.0
> >            +-0f.0
> >            +-12.0
> >            +-13.0-[01]----00.0
> >            +-13.1-[02]----00.0
> >            +-13.2-[03]--
> >            +-14.0-[04]----00.0
> >            +-14.1-[05-09]----00.0-[06-09]--+-01.0-[07]----00.0 <-- Exar
> (bus 7, dev 0, funct 0)
> >            |                               +-02.0-[08]----00.0
> >            |                               \-03.0-[09]--
> >            +-15.0
> >            +-16.0
> >            +-16.1
> >            +-19.0
> >            +-19.1
> >            +-19.2
> >            +-1f.0
> >            \-1f.1
> OK, then add the bridge first:
> 
> Scope (_SB.PCI0.RPX) {
>     Device (BRG) { // Bridge
>        Name (_ADR, 0)
> 
>        Device (EXAR) { // Expander
>            Name (_ADR, 0)
>        }
>     }
> 
> Or something like that. RPX is the root port 14.1 and if I read the
> above right both the bridge and the EXAR device have device and function
> 0.

All ok now, I've added the bridge (I had to use the BIOS sources) and
not it works:

Scope (_SB.PCI0.RP02) {

		Device (BRG1) //Bridge
		{
			Name (_ADR, 0x0000)
		
			Device (BRG2) //Bridge
			{
				Name (_ADR, 0x00010000)

				Device (EXAR)
				{
					Name (_ADR, 0x0000)

					Name (_DSD, Package ()
					{
						ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
						Package ()
						{
							Package ()
							{
								"gpio-line-names",
								Package ()
								{
									"exar_0",
									"exar_1",
									"exar_2",
									"exar_3",
									"exar_4",
									"exar_5",
									"exar_6",
									"exar_7"
								} ....
root@debian:~# gpioinfo gpiochip4
gpiochip4 - 16 lines:
	line   0:     "exar_0"       unused   input  active-high 
	line   1:     "exar_1"       unused   input  active-high 
	line   2:     "exar_2"       unused   input  active-high 
	line   3:     "exar_3"       unused   input  active-high 
	line   4:     "exar_4"       unused   input  active-high 
	line   5:     "exar_5"       unused   input  active-high 
	line   6:     "exar_6"       unused   input  active-high 
	line   7:     "exar_7"       unused   input  active-high 
	line   8:      unnamed       unused   input  active-high 
	line   9:      unnamed       unused   input  active-high 
	line  10:      unnamed       unused   input  active-high 
	line  11:      unnamed       unused   input  active-high 
	line  12:      unnamed       unused   input  active-high 
	line  13:      unnamed       unused   input  active-high 
	line  14:      unnamed       unused   input  active-high 
	line  15:      unnamed       unused   input  active-high 
root@debian:~# 

Thanks for your precious help and ideas !!!

Best regards,

Flavio