On Thu, 4 Dec 2014 11:30:39 +0100
Nicolas Ferre <nicolas.fe...@atmel.com> wrote:

> Le 03/12/2014 21:44, Boris Brezillon a écrit :
> > The EBI (External Bus Interface) is used to access external peripherals
> > (NOR, SRAM, NAND, and other specific devices like ethernet controllers).
> > Each device is assigned a CS line and an address range and can have its
> > own configuration (timings, access mode, bus width, ...).
> > This driver provides a generic DT binding to configure a device according
> > to its requirements.
> > For specific device controllers (like the NAND one) the SMC timings
> > should be configured by the controller driver through the matrix and smc
> > syscon regmaps.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezil...@free-electrons.com>
> > ---
> >  .../bindings/memory-controllers/atmel-ebi.txt      | 155 
> > +++++++++++++++++++++
> >  1 file changed, 155 insertions(+)
> >  create mode 100644 
> > Documentation/devicetree/bindings/memory-controllers/atmel-ebi.txt
> > 
> > diff --git 
> > a/Documentation/devicetree/bindings/memory-controllers/atmel-ebi.txt 
> > b/Documentation/devicetree/bindings/memory-controllers/atmel-ebi.txt
> > new file mode 100644
> > index 0000000..3749ea1
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/memory-controllers/atmel-ebi.txt
> > @@ -0,0 +1,155 @@
> > +* Device tree bindings for Atmel EBI
> > +
> > +The External Bus Interface (EBI) controller is a bus where you can connect
> > +asynchronous (NAND, NOR, SRAM, ....) and synchronous memories (SDR/DDR 
> > SDRAMs).
> > +The EBI provides a glue-less interface to asynchronous memories though the 
> > SMC
> > +(Static Memory Controller).
> > +Synchronous memories (and some asynchronous memories like NANDs) can be
> > +attached to specialized controllers which are responsible for configuring 
> > the
> > +bus appropriately according to the connected device.
> > +In the other hand, the bus interface can be automated for simple 
> > asynchronous
> > +devices.
> > +
> > +Required properties:
> > +
> > +- compatible:              "atmel,at91sam9260-ebi"
> > +                   "atmel,at91sam9261-ebi"
> > +                   "atmel,at91sam9263-ebi0"
> > +                   "atmel,at91sam9263-ebi1"
> > +                   "atmel,at91sam9g45-ebi"
> > +                   "atmel,at91sam9x5-ebi"
> > +                   "atmel,sama5d3-ebi"
> > +
> > +- reg:                     Contains offset/length value for EBI memory 
> > mapping.
> > +                   This property might contain several entries if the EBI
> > +                   memory range is not contiguous
> > +
> > +- #address-cells:  Must be 2.
> > +                   The first cell encodes the CS.
> > +                   The second cell encode the offset into the CS memory
> > +                   range.
> > +
> > +- #size-cells:             Must be set to 1.
> > +
> > +- ranges:          Encodes CS to memory region association.
> > +
> > +- clocks:          Clock feeding the EBI controller.
> > +                   See clock-bindings.txt
> > +
> > +Child chip-select (cs) nodes contain the memory devices nodes connected to
> > +such as NOR (e.g. cfi-flash) and NAND.
> > +There might be board specific devices like FPGAs.
> > +You'll define you device requirements in these child nodes.
> > +
> > +Required child cs node properties:
> > +
> > +- #address-cells:  Must be 2.
> > +
> > +- #size-cells:             Must be 1.
> > +
> > +- ranges:          Empty property indicating that child nodes can inherit
> > +                   memory layout.
> > +
> > +Optional child cs node properties:
> > +- atmel,generic-dev                boolean property specifying if the 
> > device is
> > +                           a generic device.
> 
> Here, you mean: "atmel,specialized-logic" and the corresponding text...
> 

Yep, apparently I squashed the doc fixes in the wrong commit :-(.
I'll fix that.

Thanks,

Boris


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Reply via email to