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Message-ID: <53B3F23F.3030809@cogentembedded.com>
Date: Wed, 02 Jul 2014 15:51:27 +0400
From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To: Stefan Wahren <stefan.wahren@...e.com>, davem@...emloft.net,
robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
f.fainelli@...il.com, eric.dumazet@...il.com, dave.taht@...il.com
CC: netdev@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH RFC V2 1/2] Documentation: add Device tree bindings for
QCA7000
Hello.
On 07/02/2014 11:01 AM, 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@...e.com>
>>> ---
>>> .../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?
Make it optional, please.
>>> +- 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.
Yes, of course.
>>> +- 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@...14000 {
The node name should probably be "spi" here.
>>> + #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?
I don't know the differences between Ethernet and PowerLine but looks like
they are minimal as you're implementing an Ethernet driver. So I'm still for
"ethernet".
>>> + 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
> BR Stefan Wahren
WBR, Sergei
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