linux-kernel - Re: How to use an ACPI declared GPIO in a userspace ...

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Message-ID: <CAHp75Vf-hJ78LmXF8PqOeF-CfWEYqYzMiGCEGaEfnMqxmtiwiw@mail.gmail.com>
Date:   Fri, 2 Oct 2020 15:48:18 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Flavio Suligoi <f.suligoi@...m.it>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: How to use an ACPI declared GPIO in a userspace ...

On Fri, Oct 2, 2020 at 1:02 PM Flavio Suligoi <f.suligoi@...m.it> wrote:

> > > > My SSDT table is:
> > >
> > > ^^^^ See the difference? I can't help here.
>
> This is the DSDT table related to the GPIO controller of my board:
>
> Device (GPO1)
>         {
>             Name (_ADR, Zero)  // _ADR: Address
>             Name (_HID, "INT3452")  // _HID: Hardware ID
>             Name (_CID, "INT3452")  // _CID: Compatible ID
>             Name (_DDN, "General Purpose Input/Output (GPIO) Controller - Northwest")  // _DDN: DOS Device Name
>             Name (_UID, 0x02)  // _UID: Unique ID
>             Name (RBUF, ResourceTemplate ()
>             {
>                 Memory32Fixed (ReadWrite,
>                     0x00000000,         // Address Base
>                     0x00004000,         // Address Length
>                     _Y08)
>                 Interrupt (ResourceConsumer, Level, ActiveLow, Shared, ,, )
>                 {
>                     0x0000000E,
>                 }
>             })
>             Method (_CRS, 0, NotSerialized)  // _CRS: Current Resource Settings
>             {
>                 CreateDWordField (RBUF, \_SB.GPO1._Y08._BAS, B0BA)  // _BAS: Base Address
>                 CreateDWordField (RBUF, \_SB.GPO1._Y08._LEN, B0LN)  // _LEN: Length
>                 B0BA = GP1A /* \GP1A */
>                 B0LN = GP1L /* \GP1L */
>                 Return (RBUF) /* \_SB_.GPO1.RBUF */
>             }
>
>             Method (_STA, 0, NotSerialized)  // _STA: Status
>             {
>                 If ((OSYS < 0x07DC))
>                 {
>                     Return (Zero)
>                 }
>
>                 Return (0x0F)
>             }
>         }

So, what about adding the following

DefinitionBlock ("linename.aml", "SSDT", 5, "", "LINENAME", 1)
{
  External (_SB_.GPO1, DeviceObj)
  Scope (\_SB.GPO1)
  {
      Name (_DSD, Package () {
          ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
          Package () {
              Package () {
                  "gpio-line-names",
                  Package () {
                      "Line0",
                      "Line1",
                      "Line2",
                      ...
                  }
              },
          }
      })
  }
}

?

(Replace '...' with meaningful line names or drop for now, but in any
case you need to provide as much names as lines of such GPIO
controller)

-- 
With Best Regards,
Andy Shevchenko