linux-kernel - Re: [PATCH 3/3] iio: chemical: Add OF match table for CCS811 VOC sensor

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Date:   Tue, 14 Apr 2020 17:21:53 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     robh+dt@...nel.org, narcisaanamaria12@...il.com, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] iio: chemical: Add OF match table for CCS811 VOC
 sensor

On Mon, Apr 13, 2020 at 05:50:54PM +0100, Jonathan Cameron wrote:
> On Mon, 13 Apr 2020 00:06:58 +0530
> mani@...nel.org wrote:
> 
> > From: Manivannan Sadhasivam <mani@...nel.org>
> > 
> > Add devicetree OF match table support for CCS811 VOC sensor.
> > 
> > Signed-off-by: Manivannan Sadhasivam <mani@...nel.org>
> 
> Hi,
> 
> A few small things to clean up inline
> 
> Thanks,
> 
> Jonathan
> 
> > ---
> >  drivers/iio/chemical/ccs811.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/iio/chemical/ccs811.c b/drivers/iio/chemical/ccs811.c
> > index 6cd92c49c348..313931208f61 100644
> > --- a/drivers/iio/chemical/ccs811.c
> > +++ b/drivers/iio/chemical/ccs811.c
> > @@ -24,6 +24,7 @@
> >  #include <linux/iio/triggered_buffer.h>
> >  #include <linux/iio/trigger_consumer.h>
> >  #include <linux/module.h>
> > +#include <linux/of.h>
> 
> You are including this just to get things in mod_devicetable.h
> so include that directly instead.
> 

I added this include for of_match_ptr. Since it is not needed anymore, I'll drop
this.

> >  
> >  #define CCS811_STATUS		0x00
> >  #define CCS811_MEAS_MODE	0x01
> > @@ -538,9 +539,16 @@ static const struct i2c_device_id ccs811_id[] = {
> >  };
> >  MODULE_DEVICE_TABLE(i2c, ccs811_id);
> >  
> > +static const struct of_device_id ccs811_dt_ids[] = {
> > +	{ .compatible = "ams,ccs811" },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(of, ccs811_dt_ids);
> > +
> >  static struct i2c_driver ccs811_driver = {
> >  	.driver = {
> >  		.name = "ccs811",
> > +		.of_match_table = of_match_ptr(ccs811_dt_ids),
> No need for the of_match_ptr macro.  It has several issues.
> 
> 1) Blocks PRP001 ACPI magic device types being used to instantiate
> this using the device tree binding but under ACPI.
> 2) Will give warnings about ccs811_dt_ids being unused on no
>    device tree builds.
> 

Okay, will use ccs811_dt_ids directly.

Thanks,
Mani

> >  	},
> >  	.probe = ccs811_probe,
> >  	.remove = ccs811_remove,
>