linux-kernel - Re: [RFC PATCH 06/10] spi: add support for ACPI reconfigure notifications

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Message-ID: <20160401140856.GW2350@sirena.org.uk>
Date:	Fri, 1 Apr 2016 07:08:56 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Wolfram Sang <wsa@...-dreams.de>,
	Joel Becker <jlbec@...lplan.org>,
	Christoph Hellwig <hch@....de>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	linux-efi@...r.kernel.org, linux-i2c <linux-i2c@...r.kernel.org>,
	linux-spi@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	Irina Tirdea <irina.tirdea@...el.com>
Subject: Re: [RFC PATCH 06/10] spi: add support for ACPI reconfigure
 notifications

On Fri, Apr 01, 2016 at 01:54:28PM +0300, Octavian Purdila wrote:

> I probably don't fully understand your question, but I don't see a way
> of how we can create a new SPI device from generic ACPI code. For
> example, in acpi_spi_add_device() we need the spi_master node so that
> we can allocate the spi device.

Right, but the same applies to initial enumeration so we also have to
manually instantiate ACPI devices on startup.  Why do we need to do
that?

> The handling is identical because we don't have yet have a way to
> identify what where the new nodes added when a new ACPI table /
> overlay has been loaded, so we have to rescan the ACPI namespace under
> each controller.

That's not the point.  The point is that since the handling is identical
why are we handling it through exactly the same code?

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