linux-kernel - Re: [net-next: PATCH v2 5/5] net: mvpp2: enable ACPI support in the driver

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Message-ID: <20171231192354.GB20455@lunn.ch>
Date:   Sun, 31 Dec 2017 20:23:54 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org, linux-acpi@...r.kernel.org,
        graeme.gregory@...aro.org, davem@...emloft.net,
        linux@...linux.org.uk, rafael.j.wysocki@...el.com,
        f.fainelli@...il.com, antoine.tenart@...e-electrons.com,
        thomas.petazzoni@...e-electrons.com,
        gregory.clement@...e-electrons.com,
        ezequiel.garcia@...e-electrons.com, nadavh@...vell.com,
        neta@...vell.com, ard.biesheuvel@...aro.org, jaz@...ihalf.com,
        tn@...ihalf.com
Subject: Re: [net-next: PATCH v2 5/5] net: mvpp2: enable ACPI support in the
 driver

> * Modify way of obtaining interrupts - with ACPI they are resources
>   bound to struct platform_device and it's not possible to obtain
>   them directly from the child node. Hence a formula is used, depending
>   on the port_id and number of possible CPUs.

Hi Marcin

I know nothing about ACPI. Is this limitation with respect to
interrupts fundamental to ACPI, or just that nobody has implemented
flexible interrupt support yet?

> * Until proper MDIO bus and PHY handling with ACPI is established in the
>   kernel, use only link interrupts feature in the driver.

I think interrupts might be interesting with PHY devices, since they
are child nodes of the MDIO device....

    Andrew