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iio: Allow to read mount matrix from ACPI

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Currently mount matrix is allowed in Device Tree, though there is
no technical issue to extend it to support ACPI.

Convert the function to use device_property_read_string_array() and
thus allow to read mount matrix from ACPI if available.

Example of use in _DSD method:

  Name (_DSD, Package ()
  {
     ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
     Package ()
     {
        Package () { "mount-matrix", Package() {
                "1", "0",     "0",
                "0", "0.866", "0.5",
                "0", "-0.5",  "0.866",
        } },
     }
  })

At the same time drop the "of" prefix from its name and
convert current users.

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Andy Shevchenko
2019-02-21 18:02:46 +01:00
committed by Jonathan Cameron
parent 0a39ac29e0
commit fb1589710e
7 changed files with 28 additions and 43 deletions
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4
include/linux/iio/iio.h
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@@ -130,8 +130,8 @@ struct iio_mount_matrix {
ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
const struct iio_chan_spec *chan, char *buf);
int of_iio_read_mount_matrix(const struct device *dev, const char *propname,
struct iio_mount_matrix *matrix);
int iio_read_mount_matrix(struct device *dev, const char *propname,
struct iio_mount_matrix *matrix);
typedef const struct iio_mount_matrix *
(iio_get_mount_matrix_t)(const struct iio_dev *indio_dev,