On Fri, Oct 07, 2016 at 06:18:32PM +0300, Pantelis Antoniou wrote:
> From: Georgi Vlaev <gvlaev@xxxxxxxxxxx>
>
> Add binding document for the i2c driver of SAM FPGA.
>
> Signed-off-by: Georgi Vlaev <gvlaev@xxxxxxxxxxx>
> [Ported from Juniper kernel]
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
> ---
> .../devicetree/bindings/i2c/i2c-sam-mux.txt | 20 ++++++++++
> Documentation/devicetree/bindings/i2c/i2c-sam.txt | 44 ++++++++++++++++++++++
> 2 files changed, 64 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/i2c/i2c-sam-mux.txt
> create mode 100644 Documentation/devicetree/bindings/i2c/i2c-sam.txt
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-sam-mux.txt b/Documentation/devicetree/bindings/i2c/i2c-sam-mux.txt
> new file mode 100644
> index 0000000..10ddffa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-sam-mux.txt
> @@ -0,0 +1,20 @@
> +Juniper's SAM FPGA I2C accelerator mux
> +
> +The SAM FPGA I2C mux is present only on Juniper SAM FPGA PTX series
> +of routers.
> +
> +The definition of the i2c sam bus is located in the i2c-sam.txt document.
> +
> +Required properties:
> +- compatible: should be "jnx,i2c-sam-mux".
> +- reg: master number and mux number.
This is not how i2c muxes are done.
> +
> +Optional properties:
> +- speed: If present must be either 100000 or 400000. No other values supported.
> +
> +Examples:
> +
> +pe1i2c: i2c-sam-mux@1,0 {
i2c-mux@...
> + compatible = "jnx,i2c-sam-mux";
> + reg = <1 0>;
> +};
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-sam.txt b/Documentation/devicetree/bindings/i2c/i2c-sam.txt
> new file mode 100644
> index 0000000..4830b48
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-sam.txt
> @@ -0,0 +1,44 @@
> +Juniper's SAM FPGA I2C accelerator
> +
> +The SAM FPGA accelerator is used to connect the large number of
> +I2C muxes that are present on Juniper PTX series of routers.
> +While it's an i2c bus, no other devices are located besides
> +i2c-sam-mux devices.
> +
> +The definition of the i2c sam mux is located in the i2c-sam-mux.txt document.
> +
> +Required properties:
> +- compatible: should be "jnx,i2c-sam".
> +- #address-cells: should be 2.
> +- #size-cells: should be 0.
> +- mux-channels: number of mux channels present
What is this needed for?
> +
> +Optional properties:
> +- reg: offset and length of the register set for the device are optional since
> + typically the register range is provided by the parent SAM MFD device.
> +- master-offset: Offset of where the master register memory starts.
> + Default value is 0x8000.
Make this required.
> +- reverse-fill: Fill the start entries of transactions in reverse order
Needs a better explanation.
> +- priority-tables: Use the pre-programmed priority tables in the FPGA
What does not present mean?
> +- i2c-options: list of options to be written to the option field in the
> + FPGA controlling things like SCL push-pull drives, hold-times, etc.
> +- bus-range: start of bus master range and number of masters.
Needs a better explanation.
> +
> +Examples:
> +
> +i2c-sam {
> + compatible = "jnx,i2c-sam";
> + mux-channels = <2>;
> + #size-cells = <0>;
> + #address-cells = <2>;
> +
> + /* PE0 */ pe0i2c: i2c-sam-mux@0,0 {
i2c-mux@...
> + compatible = "jnx,i2c-sam-mux";
> + reg = <0 0>;
> + };
> +
> + /* PE1 */ pe1i2c: i2c-sam-mux@1,0 {
> + compatible = "jnx,i2c-sam-mux";
> + reg = <1 0>;
> + };
> +};
> --
> 1.9.1
>
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