[PATCH v5 12/17] dt-bindings: qca7000-spi: Rework binding
From: Stefan Wahren <hidden>
Date: 2017-05-10 08:58:03
Also in:
linux-devicetree, lkml, netdev
Subsystem:
networking drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
In preparation for the QCA7000 UART binding rework the binding document. Signed-off-by: Stefan Wahren <redacted> --- .../devicetree/bindings/net/qca-qca7000-spi.txt | 49 +++++++++++++--------- 1 file changed, 29 insertions(+), 20 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/qca-qca7000-spi.txt b/Documentation/devicetree/bindings/net/qca-qca7000-spi.txt
index c74989c..a37f656 100644
--- a/Documentation/devicetree/bindings/net/qca-qca7000-spi.txt
+++ b/Documentation/devicetree/bindings/net/qca-qca7000-spi.txt@@ -1,29 +1,38 @@ -* 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. - -Example: + 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. + +SPI Example: /* Freescale i.MX28 SPI master*/ ssp2: spi@80014000 {
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2.1.4