linux-kernel - Re: [PATCH 1/1] i2c: dln2: Pass forward ACPI companion

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Date:	Mon, 18 Apr 2016 10:54:13 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Irina Tirdea <irina.tirdea@...el.com>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Octavian Purdila <octavian.purdila@...el.com>,
	Laurentiu Palcu <laurentiu.palcu@...el.com>
Subject: Re: [PATCH 1/1] i2c: dln2: Pass forward ACPI companion

On Sat, Apr 16, 2016 at 11:33:04PM +0200, Wolfram Sang wrote:
> On Thu, Mar 24, 2016 at 08:59:16PM +0200, Irina Tirdea wrote:
> > Share the ACPI companion for the platform device with the
> > i2c adapter, so that the adapter has access to the properties
> > defined in ACPI tables.
> > 
> > Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
> > ---
> 
> Adding Mika for my question: A few drivers do this, does it make sense
> to put this into the core?

It is pretty much dependent on the driver in question, how it wants to
deal with the ACPI companion.

DT does the same for of_node:

	ACPI_COMPANION_SET(&dln2->adapter.dev, ACPI_COMPANION(&pdev->dev));
  	dln2->adapter.dev.of_node = dev->of_node;

> Apart from that, looks good to me.

Looks good to me too.

> >  drivers/i2c/busses/i2c-dln2.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/i2c/busses/i2c-dln2.c b/drivers/i2c/busses/i2c-dln2.c
> > index 1600edd..f2eb4f7 100644
> > --- a/drivers/i2c/busses/i2c-dln2.c
> > +++ b/drivers/i2c/busses/i2c-dln2.c
> > @@ -19,6 +19,7 @@
> >  #include <linux/i2c.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/mfd/dln2.h>
> > +#include <linux/acpi.h>
> >  
> >  #define DLN2_I2C_MODULE_ID		0x03
> >  #define DLN2_I2C_CMD(cmd)		DLN2_CMD(cmd, DLN2_I2C_MODULE_ID)
> > @@ -210,6 +211,7 @@ static int dln2_i2c_probe(struct platform_device *pdev)
> >  	dln2->adapter.algo = &dln2_i2c_usb_algorithm;
> >  	dln2->adapter.quirks = &dln2_i2c_quirks;
> >  	dln2->adapter.dev.parent = dev;
> > +	ACPI_COMPANION_SET(&dln2->adapter.dev, ACPI_COMPANION(&pdev->dev));
> >  	dln2->adapter.dev.of_node = dev->of_node;
> >  	i2c_set_adapdata(&dln2->adapter, dln2);
> >  	snprintf(dln2->adapter.name, sizeof(dln2->adapter.name), "%s-%s-%d",
> > -- 
> > 1.9.1
> >