linux-kernel - Re: [net-next: PATCH v2 5/7] net: mvmdio: add ACPI support

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Message-ID: <YMqCz0j7/Gdgtf+5@lunn.ch>
Date:   Thu, 17 Jun 2021 01:01:35 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>, upstream@...ihalf.com,
        Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@....com>,
        Jon Nettleton <jon@...id-run.com>,
        Tomasz Nowicki <tn@...ihalf.com>, rjw@...ysocki.net,
        lenb@...nel.org
Subject: Re: [net-next: PATCH v2 5/7] net: mvmdio: add ACPI support

On Thu, Jun 17, 2021 at 12:37:06AM +0200, Marcin Wojtas wrote:
> śr., 16 cze 2021 o 21:51 Andrew Lunn <andrew@...n.ch> napisał(a):
> >
> > On Wed, Jun 16, 2021 at 09:07:57PM +0200, Marcin Wojtas wrote:
> > > This patch introducing ACPI support for the mvmdio driver by adding
> > > acpi_match_table with two entries:
> > >
> > > * "MRVL0100" for the SMI operation
> > > * "MRVL0101" for the XSMI mode
> > >
> > > Also clk enabling is skipped, because the tables do not contain
> > > such data and clock maintenance relies on the firmware.
> >
> > This last part seems to be no longer true.
> >
> 
> Well, it is still relies on firmware (no clocks are passed via ACPI),
> but skipping this enablement is hidden in the internals of
> devm_clk_bulk_get_optional() and clk_bulk_prepare_enable().

A quick grep in driver/clk does not reveal any ACPI code. Nor did i
spot any generic clock code in drivers/acpi. So even if you did add
clocks to the tables, i don't see how they would be used.

       Andrew