lkml.org 
[lkml]   [2012]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 09/19] ARM: ux500: Enable SSP (SPI) for HREF when booting Device Tree
    Hi!

    On 09/10/2012 01:11 PM, Linus Walleij wrote:
    > +SPI slave nodes must be children of the SPI master node and can
    > +contain the following properties.
    > +
    > +- pl022,interface : interface type:
    > + 0: SPI
    > + 1: Texas Instruments Synchronous Serial Frame Format
    > + 2: Microwire (Half Duplex)
    > +- pl022,com-mode : polling, interrupt or dma
    > +- pl022,rx-level-trig : Rx FIFO watermark level
    > +- pl022,tx-level-trig : Tx FIFO watermark level
    > +- pl022,ctrl-len : Microwire interface: Control length
    > +- pl022,wait-state : Microwire interface: Wait state
    > +- pl022,duplex : Microwire interface: Full/Half duplex
    >
    > Currently this is defined as auxdata in board-mop500.c
    > but notanly cs-gpios (num chipselects) should come from
    > device tree instead.
    >
    > It appears Roland has written his bindings such that DT
    > data augments platform data (yes, I am also getting crazy
    > about this prioritization, mea culpa for ACKing this without
    > proper discussion) so it appears that you could actually
    > use AUXDATA and some stuff in the DT at the same
    > time.

    Sorry for the incompleteness of the devicetree conversion. I'm sending a
    patch (separately) that makes it possible to specify everything via
    devicetree, so you can choose between dt and platform data.

    Except in case of callback specification (dma_filter()), you need to
    provide platform data.

    Interestingly, when I removed the actual platform data from the board
    file, I noticed that I still needed to specify a device name (like
    dev:ssp0) to make it work. But this seems to be expected according to
    the documentation of OF_DEV_AUXDATA(). Are there any plans or ideas how
    to fix this?

    When we have sorted out this driver change (please check the new pl022
    specific dt property names!), I will provide patches for arm-soc to
    actually use this new interface via dts files.

    Thanks in advance,

    Roland


    \
     
     \ /
      Last update: 2012-09-17 19:41    [W:0.023 / U:0.524 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site