linux-kernel - Re: [PATCH 3/3] iio: st_pressure: Support i2c probe using acpi

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Date:   Tue, 29 Nov 2016 12:25:03 +0800
From:   Shrirang Bagul <shrirang.bagul@...onical.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>,
        Denis CIOCCA <denis.ciocca@...com>,
        Tiberiu Breana <tiberiu.a.breana@...el.com>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Gregor Boirie <gregor.boirie@...rot.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] iio: st_pressure: Support i2c probe using acpi

On Sun, 2016-11-27 at 11:12 +0000, Jonathan Cameron wrote:
> On 24/11/16 14:28, Linus Walleij wrote:
> > On Thu, Nov 24, 2016 at 6:33 AM, Shrirang Bagul
> > <shrirang.bagul@...onical.com> wrote:
> > 
> > > Compatible strings are not available on ACPI based systems. This patch
> > > adds
> > > support to use DSDT information read from platform BIOS instead for
> > > probing
> > > st pressure sensors.
> > > 
> > > Signed-off-by: Shrirang Bagul <shrirang.bagul@...onical.com>
> > 
> > (...)
> > > +#ifdef CONFIG_ACPI
> > > +static const struct acpi_device_id st_press_acpi_match[] = {
> > > +       {"SNO9210", LPS22HB},
> > > +       { },
> > > +};
> > 
> > Same comment. One sensor only supported by ACPI really?
> 
> As demonstrated by this one, they are often registered under effectively
> random names!
> Digging out those random names and associating them with a particular chip is
> always
> going to be a non trivial job.
> 
> Hence I'm happy to take these as they stand.  We can add more entries when we
> come
> across them.
> > 
> > Take a wider look.
Yes, I will.
> 
> Shirang has done a good job identifying this one and sending it upstream.
> Be nice Linus and don't try to get him to do all the hard work ;)
> 
> As such applied to the togreg branch of iio.git. Will be pushed out as testing
> for
> the autobuilders to play with it.
> 
> Note there will be some weeks before I push this out as togreg (given merge
> window
> is about to open) so plenty of time for others to take a look!
> 
> Thanks,
> 
> Jonathan
Thank you Jonathan. I'll follow-up on Linus's suggestion and try and identify
more of these sensors on some of the hardware we have in the lab. and try to add
support for some more devices.

Thanks,
Shrirang
> > 
> > Yours,
> > Linus Walleij
> > --
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> > 
> 
>