1. 14 Feb, 2017 1 commit
    • Romain Izard's avatar
      atmel_serial: Use the fractional divider when possible · 2867af2d
      Romain Izard authored
      The fractional baud rate generator is available when using the
      asynchronous mode of Atmel USART controllers. It makes it possible to
      use higher baudrates, in exchange for a less precise clock with a
      variable duty cycle.
      
      The existing code restricts its use to the normal mode of the USART
      controller, following the recommendation from the datasheet for the
      first chip embedding this type of controller. This recommendation has
      been removed from the documentation for the newer chips. After
      verification, all revisions of this controller should be able to use the
      fractional baud rate generator with the different asynchronous modes.
      
      Removing the condition on ATMEL_US_USMODE makes it possible to get
      correct baudrates at high speed in more cases.
      
      This was tested with a board using an Atmel SAMA5D2 chip and a TI
      WL1831 WiFi/Bluetooth combo chip at 3 Mbauds, with hardware flow control
      enabled.
      Signed-off-by: default avatarRomain Izard <romain.izard.pro@gmail.com>
      Acked-by: default avatarLudovic Desroches <ludovic.desroches@microchip.com>
      Signed-off-by: default avatarRichard Genoud <richard.genoud@gmail.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      2867af2d
  2. 10 Feb, 2017 11 commits
  3. 09 Feb, 2017 2 commits
  4. 06 Feb, 2017 14 commits
  5. 03 Feb, 2017 12 commits