On 2016-10-10 21:54, Rob Herring wrote:
> 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@...
Hmm, I actually think i2c@... is the usual naming for i2c-mux children.
Cheers,
Peter
>> + 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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