linux-kernel - [PATCH v3 0/2] IIO: st_sensors_i2c: improve device enumeration

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Date:   Wed, 4 Jul 2018 15:27:06 +0200
From:   Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
To:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiongfeng Wang <xiongfeng.wang@...aro.org>,
        Javier Martinez Canillas <javier@...hile0.org>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/2] IIO: st_sensors_i2c: improve device enumeration

When trying to instantiate a st_accel_i2c device from an ACPI based
system, I ran into some problems:

For my device, there is no ACPI match table entry, so rather than
creating /allocating a new ACPI HID for the device, I wanted to use an
existing DT table compatible entry via creating an ACPI_DT_NAMESPACE_HID
/PRP0001 HID ACPI entry (see Documentation/acpi/enumeration.txt).

This did not work because st_accel_i2c.c bails out if there is a ACPI
node but no ACPI table match. Use device_get_match_data API to get the
right driver data.

acpi_device_get_match_data() currently doesn't return DT compatible
matches. A separate patch is submitted to fix this.

v3:
  - remove unused i2c_device_id .driver_data fields as suggested by
    Javier Martinez Canillas.
v2:
  - use device_get_match_data API as suggested by Andy Shevchenko
  - removed syncing DT/I2C table names as Jonathan Cameron pointed out
    this would be an ABI change
  - converting from probe() to probe_new() is moved into a separate
    patch (as suggested by Jonathan Cameron)

Nikolaus Voss (2):
  IIO: st_accel_i2c.c: Simplify access to driver data
  IIO: st_accel_i2c.c: Use probe_new() instead of probe()

 drivers/iio/accel/st_accel_i2c.c | 61 ++++++++++++++------------------
 1 file changed, 26 insertions(+), 35 deletions(-)

-- 
2.17.1