On Thu, Feb 06, 2014 at 06:57:47PM +0200, Ivan T. Ivanov wrote:
> From: "Ivan T. Ivanov" <iivanov@xxxxxxxxxx>
>
> The Qualcomm Universal Peripheral (QUP) core is an
> AHB slave that provides a common data path (an output
> FIFO and an input FIFO) for serial peripheral interface
> (SPI) mini-core.
>
> Signed-off-by: Ivan T. Ivanov <iivanov@xxxxxxxxxx>
> ---
> .../devicetree/bindings/spi/qcom,spi-qup.txt | 86 ++++++++++++++++++++
> 1 file changed, 86 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
>
> diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt b/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
> new file mode 100644
> index 0000000..74565f1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
> @@ -0,0 +1,86 @@
> +Qualcomm Universal Peripheral (QUP) Serial Peripheral Interface (SPI)
> +
> +The QUP core is an AHB slave that provides a common data path (an output FIFO
> +and an input FIFO) for serial peripheral interface (SPI) mini-core.
> +
> +SPI in master mode support up to 50MHz, up to four chip selects, and a
> +programmable data path from 4 bits to 32 bits; supports numerous protocol
> +variants.
> +
> +Required properties:
> +- compatible: Should contain "qcom,spi-qup-v2".
Could be more descriptive. qcom,spi-qup-v2.1.1 for MSM8974 v1 and
qcom,spi-qup-v2.2.1 for MSM8974 v2.
> +- reg: Should contain base register location and length
> +- interrupts: Interrupt number used by this controller
> +
> +- clocks: Should contain the core clock and the AHB clock.
> +- clock-names: Should be "core" for the core clock and "iface" for the
> + AHB clock.
> +
> +- #address-cells: Number of cells required to define a chip select
> + address on the SPI bus. Should be set to 1.
> +- #size-cells: Should be zero.
> +
> +Optional properties:
> +- spi-max-frequency: Specifies maximum SPI clock frequency, Units - Hz. Definition
> + as per Documentation/devicetree/bindings/spi/spi-bus.txt
> +
> +SPI slave nodes must be children of the SPI master node and can
> +contain properties described in Documentation/devicetree/bindings/spi/spi-bus.txt
> +
> +Example:
> +
> + spi_8: spi@f9964000 { /* BLSP2 QUP2 */
> +
> + compatible = "qcom,spi-qup-v2";
> + #address-cells = <1>;
> + #size-cells = <0>;
> + reg = <0xf9964000 0x1000>;
> + interrupts = <0 102 0>;
> + spi-max-frequency = <19200000>;
> +
> + clocks = <&gcc GCC_BLSP2_QUP2_SPI_APPS_CLK>, <&gcc GCC_BLSP2_AHB_CLK>;
> + clock-names = "core", "iface";
> +
> + pinctrl-names = "default";
> + pinctrl-0 = <&spi8_default>;
> +
> + device@0 {
> + compatible = "arm,pl022-dummy";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + reg = <0>; /* Chip select 0 */
> + spi-max-frequency = <19200000>;
> + spi-cpol;
> + };
> +
> + device@1 {
> + compatible = "arm,pl022-dummy";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + reg = <1>; /* Chip select 1 */
> + spi-max-frequency = <9600000>;
> + spi-cpha;
> + };
> +
> + device@2 {
> + compatible = "arm,pl022-dummy";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + reg = <2>; /* Chip select 2 */
> + spi-max-frequency = <19200000>;
> + spi-cpol;
> + spi-cpha;
> + };
> +
> + device@3 {
> + compatible = "arm,pl022-dummy";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + reg = <3>; /* Chip select 3 */
> + spi-max-frequency = <19200000>;
> + spi-cpol;
> + spi-cpha;
> + spi-cs-high;
> + };
> + };
> +
> --
> 1.7.9.5
>
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