From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan O'Donovan <dan@emutex.com>
Subject: Re: [PATCH v2 0/3] Init device ids from ACPI of_compatible
Date: Wed, 13 Jul 2016 15:15:44 +0100
Message-ID: <57864D10.2020007@emutex.com>
References: <cover.1468409668.git.leonard.crestez@intel.com>
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Cc: Len Brown <lenb@kernel.org>, linux-i2c@vger.kernel.org,
	Wolfram Sang <wsa@the-dreams.de>, linux-spi@vger.kernel.org,
	Mark Brown <broonie@kernel.org>, linux-kernel@vger.kernel.org,
	Octavian Purdila <octavian.purdila@intel.com>
To: Crestez Dan Leonard <leonard.crestez@intel.com>,
	linux-acpi@vger.kernel.org,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Jarkko Nikula <jarkko.nikula@intel.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>
Return-path: <linux-i2c-owner@vger.kernel.org>
In-Reply-To: <cover.1468409668.git.leonard.crestez@intel.com>
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List-Id: linux-spi.vger.kernel.org

On 07/13/2016 12:53 PM, Crestez Dan Leonard wrote:
> When using devicetree stuff like i2c_client.name or spi_device.modalias
> is initialized to the first DT compatible id with the vendor prefix
> stripped. Since some drivers rely on this in order to differentiate between
> hardware variants try to replicate it when using ACPI with DT ids.
>
> This also makes it so that the i2c_device_id parameter passed to probe is
> non-NULL when matching with ACPI and DT ids.
This solves a problem for me, thanks Leonard!  For the series (in case
it helps):

Tested-by: Dan O'Donovan <dan@emutex.com>

>
> These patches are on top of linux-pm/linux-next. I delayed v2 until ACPI
> overlays got in in order to avoid conflicts. I tested using ACPI overlays but
> there is no actual dependency. This series just extends the PRP0001 feature to
> be more useful for I2C/SPI.
>
> The patches only touches the ACPI-specific parts of the i2c and spi core.
>
> Here is an example .dsl for an SPI accelerometer connected to minnowboard max:
>
> Device (ACCL)
> {
>     Name (_ADR, Zero)
>     Name (_HID, "PRP0001")
>     Name (_CID, "PRP0001")
>     Name (_UID, One)
>
>     Method (_CRS, 0, Serialized)
>     {
> 	Name (RBUF, ResourceTemplate ()
> 	{
> 	    SPISerialBus(1, PolarityLow, FourWireMode, 16,
> 		    ControllerInitiated, 1000000, ClockPolarityLow,
> 		    ClockPhaseFirst, "\\_SB.SPI1",)
> 	    GpioInt (Edge, ActiveHigh, Exclusive, PullDown, 0x0000,
> 		     "\\_SB.GPO2", 0x00, ResourceConsumer, , )
> 	    { // Pin list
> 		    1
> 	    }
> 	})
> 	Return (RBUF)
>     }
>     Name (_DSD, Package ()
>     {
> 	ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> 	Package ()
> 	{
> 	    Package () {"compatible", "st,lis3dh"},
> 	}
>     })
> }
>
> Link to v1: https://www.spinics.net/lists/linux-acpi/msg66469.html
> Changes:
>  * Rebase on after acpi overlays got it.
>  * Change acpi_of_modalias outlen param to size_t
>  * Use {} after else
>
> Crestez Dan Leonard (3):
>   acpi: Export acpi_of_modalias equiv of of_modalias_node
>   acpi i2c: Initialize info.type from of_compatible
>   acpi spi: Initialize modalias from of_compatible
>
>  drivers/acpi/bus.c      | 36 ++++++++++++++++++++++++++++++++++++
>  drivers/i2c/i2c-core.c  |  8 +++++++-
>  drivers/spi/spi.c       | 11 ++++++++++-
>  include/acpi/acpi_bus.h |  1 +
>  4 files changed, 54 insertions(+), 2 deletions(-)
>