On Sat, Dec 10, 2016 at 3:49 AM, Cédric Le Goater <clg@xxxxxxxx> wrote:
> Signed-off-by: Cédric Le Goater <clg@xxxxxxxx>
> ---
> .../devicetree/bindings/mtd/aspeed-smc.txt | 51 ++++++++++++++++++++++
> 1 file changed, 51 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mtd/aspeed-smc.txt
>
> diff --git a/Documentation/devicetree/bindings/mtd/aspeed-smc.txt b/Documentation/devicetree/bindings/mtd/aspeed-smc.txt
> new file mode 100644
> index 000000000000..e2c88cea38f6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/aspeed-smc.txt
> @@ -0,0 +1,51 @@
> +* Aspeed Firmware Memory controller
> +* Aspeed SPI Flash Memory Controller
> +
> +The Firmware Memory Controller in the Aspeed AST2500 SoC supports
> +three chip selects, two of which are always of SPI type and the third
> +can be SPI or NOR type flash, but the driver only supports SPI.
As the bindings are a description of the hardware and not the driver,
we might want to reword this. Perhaps "these bindings only describe
SPI"?
Cheers,
Joel
> +
> +The two SPI flash memory controllers in the AST2500 each support two
> +chip selects.
> +
> +Required properties:
> + - compatible : Should be one of
> + "aspeed,ast2400-fmc" for the AST2400 Firmware Memory Controller
> + "aspeed,ast2400-spi" for the AST2400 SPI Flash memory Controller
> + "aspeed,ast2500-fmc" for the AST2500 Firmware Memory Controller
> + "aspeed,ast2500-spi" for the AST2500 SPI flash memory controllers
> +
> + - reg : the first contains the control register location and length,
> + the second contains the memory window mapping address and length
> + - #address-cells : must be 1 corresponding to chip select child binding
> + - #size-cells : must be 0 corresponding to chip select child binding
> +
> +Optional properties:
> + - interrupts : Should contain the interrupt for the dma device if an
> + FMC
> +
> +The child nodes are the SPI flash modules which must have a compatible
> +property as specified in bindings/mtd/jedec,spi-nor.txt
> +
> +Optionally, the child node can contain properties for SPI mode (may be
> +ignored):
> + - spi-max-frequency - max frequency of spi bus
> +
> +
> +Example:
> +fmc: fmc@1e620000 {
> + compatible = "aspeed,ast2500-fmc";
> + reg = < 0x1e620000 0x94
> + 0x20000000 0x02000000 >;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + interrupts = <19>;
> + flash@0 {
> + reg = < 0 >;
> + compatible = "jedec,spi-nor";
> + /* spi-max-frequency = <>; */
> + /* m25p,fast-read; */
> + #address-cells = <1>;
> + #size-cells = <1>;
> + };
> +};
> --
> 2.7.4
>
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