1. 02 Dec, 2017 3 commits
  2. 22 Aug, 2017 1 commit
  3. 22 Jul, 2017 1 commit
    • Rob Herring's avatar
      iio: Convert to using %pOF instead of full_name · 3921db46
      Rob Herring authored
      Now that we have a custom printf format specifier, convert users of
      full_name to use %pOF instead. This is preparation to remove storing
      of the full path string for each node.
      Signed-off-by: default avatarRob Herring <robh@kernel.org>
      Cc: Jonathan Cameron <jic23@kernel.org>
      Cc: Hartmut Knaack <knaack.h@gmx.de>
      Cc: Lars-Peter Clausen <lars@metafoo.de>
      Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
      Cc: Carlo Caione <carlo@caione.org>
      Cc: Kevin Hilman <khilman@baylibre.com>
      Cc: linux-iio@vger.kernel.org
      Cc: linux-arm-kernel@lists.infradead.org
      Cc: linux-amlogic@lists.infradead.org
      Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
      3921db46
  4. 09 Jul, 2017 1 commit
  5. 11 Jun, 2017 1 commit
  6. 03 Jun, 2017 1 commit
  7. 07 May, 2017 2 commits
  8. 25 Mar, 2017 1 commit
  9. 19 Feb, 2017 2 commits
  10. 28 Jan, 2017 1 commit
    • Martin Blumenstingl's avatar
      iio: adc: add a driver for the SAR ADC found in Amlogic Meson SoCs · 3adbf342
      Martin Blumenstingl authored
      This adds support for the SAR (Successive Approximation Register) ADC
      on the Amlogic Meson SoCs.
      
      The code is based on the public S805 (Meson8b) and S905 (GXBB)
      datasheets (see [0] and [1]), as well as by reading (various versions
      of) the vendor driver and by inspecting the registers on the vendor
      kernels of my testing-hardware.
      
      Currently the GXBB, GXL and GXM SoCs are supported. GXBB hardware has
      10-bit ADC resolution, while GXL and GXM have 12-bit ADC resolution.
      The code was written to support older SoCs (Meson8 and Meson8b) as well,
      but due to lack of actual testing-hardware no of_device_id was added for
      these.
      
      Two "features" from the vendor driver are currently missing:
      - the vendor driver uses channel #7 for calibration (this improves the
        accuracy of the results - in my tests the results were less than 3%
        off without calibration compared to the vendor driver). Adding support
        for this should be easy, but is not required for most applications.
      - channel #6 is connected to the SoCs internal temperature sensor.
        Adding support for this is probably not so easy since (based on the
        u-boot sources) most SoC versions are using different registers and
        algorithms for the conversion from "ADC value" to temperature.
      
      Supported by the hardware but currently not supported by the driver:
      - reading multiple channels at the same time (the hardware has a FIFO
        buffer which stores multiple results)
      - continuous sampling (this would require a way to enable this
        individually because otherwise the ADC would be drawing power
        constantly)
      - interrupt support (similar to the vendor driver this new driver is
        polling the results. It is unclear if the IRQ-mode is supported on
        older (Meson6 or Meson8) hardware as well or if there are any errata)
      
      [0]
      http://dn.odroid.com/S805/Datasheet/S805_Datasheet%20V0.8%2020150126.pdf
      [1] http://dn.odroid.com/S905/DataSheet/S905_Public_Datasheet_V1.1.4.pdfSigned-off-by: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
      Tested-by: Neil Armstrong's avatarNeil Armstrong <narmstrong@baylibre.com>
      Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
      3adbf342