linux-kernel - RE: [PATCH v3 1/2] gpio: mlxbf2: Introduce IRQ support

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Message-ID: <CH2PR12MB38956613C5D7ACD6078FC86ED7A79@CH2PR12MB3895.namprd12.prod.outlook.com>
Date:   Mon, 27 Sep 2021 14:26:33 +0000
From:   Asmaa Mnebhi <asmaa@...dia.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        David Thompson <davthompson@...dia.com>
Subject: RE: [PATCH v3 1/2] gpio: mlxbf2: Introduce IRQ support

> The BlueField GPIO HW only support Edge interrupts.

O.K. So please remove all level support from this driver,
and return -EINVAL if requested to do level.
This also means, you cannot use interrupts with the
Ethernet PHY. The PHY is using level interrupts.

Why not? The HW folks said it is alright because they
Do some internal conversion of PHY signal and we have
tested This extensively.

Oh sorry I misunderstood what you meant.
In software we don't use the GPIO pin value itself to
Register the interrupt. We use a HW interrupt common
To all GPIO pins. So we should be ok. We only set this
EDGE register because it is required from a HW
Perspective to detect the INT_N signal.