Hello Sergei,
Am 01.07.2014 19:33, schrieb Sergei Shtylyov:
> Hello.
>
> On 07/01/2014 08:36 PM, Stefan Wahren wrote:
>
>> This patch adds the Device tree bindings for the
>> Ethernet over SPI protocol driver of the Qualcomm
>> QCA7000 HomePlug GreenPHY.
>
>> Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
>> ---
>> .../devicetree/bindings/net/qca-qca7000-spi.txt | 47
>> ++++++++++++++++++++
>> 1 file changed, 47 insertions(+)
>> create mode 100644
>> Documentation/devicetree/bindings/net/qca-qca7000-spi.txt
>
>> diff --git
>> a/Documentation/devicetree/bindings/net/qca-qca7000-spi.txt
>> b/Documentation/devicetree/bindings/net/qca-qca7000-spi.txt
>> new file mode 100644
>> index 0000000..66ff588
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/net/qca-qca7000-spi.txt
>> @@ -0,0 +1,47 @@
>> +* Qualcomm QCA7000 (Ethernet over SPI protocol)
>> +
>> +Note: The QCA7000 is useable as a SPI device. In this case it must
>> be defined
>> +as a child of a SPI master in the device tree.
>> +
>> +Required properties:
>> +- compatible : Should be "qca,qca7000"
>> +- reg : Should specify the SPI chip select
>> +- interrupt-parent : Should specify the pHandle of the source interrupt
>
> This property is not really required, it could be inherited from an
> upper-level node.
should i move this property to the optional properties or drop it from
the properties?
>
>> +- interrupts : The first cell should specify the index of the source
>> interrupt
>> + and the second cell should specify the trigger type as rising edge
>> +- spi-cpha : Must be set
>> +- spi-cpol: Must be set
>> +
>> +Optional properties:
>> +- spi-max-frequency : Maximum frequency of the SPI bus the chip can
>> operate at.
>> + Numbers smaller than 1000000 or greater than 16000000 are invalid.
>> Missing
>> + the property will set the SPI frequency to 8000000 Hertz.
>> +- local-mac-address: 6 bytes, mac address
>
> s/mac/MAC/.
I assume that the replacement should apply only to the property
description not to the property name.
>
>
>> +- qca,legacy-mode : Set the SPI data transfer of the QCA7000 to
>> legacy mode.
>> + In this mode the SPI master must toggle the chip select between
>> each data
>> + word. In burst mode these gaps aren't necessary, which is faster.
>> + This setting depends on how the QCA7000 is setup via GPIO pin
>> strapping.
>> + If the property is missing the driver defaults to burst mode.
>> +
>> +Example:
>> +
>> +/* Freescale i.MX28 SPI master*/
>> +ssp2: ssp@80014000 {
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> + compatible = "fsl,imx28-spi";
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&spi2_pins_a>;
>> + status = "okay";
>> +
>> + qca7000@0 {
>
> According to the ePAPR standard [1]:
>
> The name of a node should be somewhat generic, reflecting the function
> of the device and not its precise programming model. If appropriate,
> the name should be one of the following choices:
> [...]
> - ethernet;
I have doubts about that. I agree that the current node name doesn't fit
to ePAPR. The function of a QCA7000 isn't really a ethernet device. Yes,
this linux driver implementation handle the QCA7000 as a ethernet
device. But the QCA7000 a powerline device according to Homeplug GreenPHY.
How about using powerline as node name?
>
>> + compatible = "qca,qca7000";
>> + interrupt-parent = <&gpio3>; /* GPIO Bank 3 */
>> + interrupts = <25 0x1>; /* Index: 25, rising edge */
>> + reg = <0x0>;
>> + spi-cpha; /* SPI mode: CPHA=1 */
>> + spi-cpol; /* SPI mode: CPOL=1 */
>> + spi-max-frequency = <8000000>; /* freq: 8 MHz */
>> + local-mac-address = [ A0 B0 C0 D0 E0 F0 ];
>> + };
>> +};
>
> [1]
> http://www.power.org/resources/downloads/Power_ePAPR_APPROVED_v1.0.pdf
>
> WBR, Sergei
>
BR Stefan Wahren
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