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

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Message-ID: <757023db21e642a3a4b6d33428c191cc@asem.it>
Date:   Fri, 2 Oct 2020 10:02:19 +0000
From:   Flavio Suligoi <f.suligoi@...m.it>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
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 ...

Hi Andy,

sorry for the delay!

> > > 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)
            }
        }

 
> --
> With Best Regards,
> Andy Shevchenko

Best regards,

Flavio