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dt-bindings: qca7000-spi: Rework binding 

In preparation for the QCA7000 UART binding rework the binding document.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefan Wahren 2017-05-29 13:57:21 +02:00 committed by David S. Miller
parent b2f98200c7
commit fd787048a9
1 changed files with 28 additions and 19 deletions
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47
Documentation/devicetree/bindings/net/qca-qca7000-spi.txt
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* Qualcomm QCA7000 (Ethernet over SPI protocol)
* Qualcomm QCA7000
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.
The QCA7000 is a serial-to-powerline bridge with a host interface which could
be configured either as SPI or UART slave. This configuration is done by
the QCA7000 firmware.
(a) Ethernet over SPI
In order to use the QCA7000 as SPI device 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
- 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
- compatible : Should be "qca,qca7000"
- reg : Should specify the SPI chip select
- 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:
- interrupt-parent : Specify the pHandle of the source interrupt
- interrupt-parent : Specify the pHandle of the source interrupt
- 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
- 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.
Numbers smaller than 1000000 or greater than 16000000
are invalid. Missing the property will set the SPI
frequency to 8000000 Hertz.
- local-mac-address : see ./ethernet.txt
- 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:
SPI Example:
/* Freescale i.MX28 SPI master*/
ssp2: spi@80014000 {