linux-kernel - Re: [PATCH v5 1/2] platform/mellanox: Add bootctl driver for Mellanox BlueField Soc

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Date:   Mon, 20 May 2019 21:12:09 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Liming Sun <lsun@...lanox.com>
Cc:     Andy Shevchenko <andy@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Vadim Pasternak <vadimp@...lanox.com>,
        David Woods <dwoods@...lanox.com>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] platform/mellanox: Add bootctl driver for
 Mellanox BlueField Soc

On Mon, May 20, 2019 at 06:07:44PM +0000, Liming Sun wrote:
> > > +static struct platform_driver mlxbf_bootctl_driver = {
> > > +	.probe = mlxbf_bootctl_probe,
> > > +	.driver = {
> > > +		.name = "mlxbf-bootctl",
> > > +		.groups = mlxbf_bootctl_groups,
> > > +		.acpi_match_table = mlxbf_bootctl_acpi_ids,
> > 
> > Why is an acpi driver a platform driver?  Isn't there a "real" acpi
> > driver interface you should be tieing into instead?
> > 
> > Only use a platform driver as an absolute last resort.  I don't think
> > that is the case here.
> 
> The driver is trying to configure boot-swapping and display secure state,
> and is defined/initiated in ACPI table in UEFI. It seems a little hard to
> categorize this driver to any existing subsystem. Any suggestion
> where it might be a better fit (like drivers/misc, drivers/firmware, etc)? 
> Please correct me if I misunderstand the comments. Thanks!.

The comment was asking why an acpi driver is a platform driver, but then
I went and looked now at a bunch of acpi drivers, and they all are
platform drivers :(

Anyway, drivers/acpi/ seems like the best place for this file, right?

thanks,

greg k-h