On Thu, Jul 05, 2018 at 03:46:41PM -0600, Girish Mahadevan wrote:
> Signed-off-by: Girish Mahadevan <girishm@xxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/spi/qcom,spi-qcom-qspi.txt | 36 ++++++++++++++++++++++
> err.txt | 27 ----------------
> 2 files changed, 36 insertions(+), 27 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt
> delete mode 100644 err.txt
>
> diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt
> new file mode 100644
> index 0000000..3baa893
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.txt
> @@ -0,0 +1,36 @@
> +QTI [Qualcomm Technologies Inc] Quad Serial Peripheral Interface (QSPI)
> +
> +QSPI [Quad Serial Peripheral Interface] allows single dual and quad read/write
> +access to slaves. QTI's QSPI controller implements the QSPI protocol to interface
> +with slaves like NOR Flash devices.
> +
> +Required properties:
> +- compatible: Should contain:
> + "qcom,qspi-v1"
Needs an SoC specific compatible string.
> +- reg: Contains the base register location and length
> +- interrupts: Interrupt number used by the controller.
> +- clocks: Contains the core and AHB clock names.
> +- clock-names: "core" for core clock and "iface" for AHB clock.
> +- spi-max-frequency: Maximum SPI core clock frequency in Hz.
This goes in the slave device nodes.
> +
> +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:
> +
> + qspi: qspi@7418000 {
> + compatible = "qcom,qspi-v1";
> + #address-cells = <1>;
> + #size-cells = <0>;
> + reg = <0x7418000 0x600>;
> + interrupts = <0 459 0>;
> + clock-names = "iface", "core";
> + clocks = <&clock_gcc clk_gcc_qspi_ahb_clk>,
> + <&clock_gcc clk_gcc_qspi_ser_clk>;
> +
> + device@0 {
> + compatible = "dummy_device";
Why don't you use an actual NOR flash chip here.
> + reg = <x>; /* CS for the device */
It's an example, show a CS#.
> + spi-max-frequency = <f>; /* Max supported frequency of the slave (Hz) */
> + };
> + };
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