forked from Minki/linux
687e3d5550
As of_get_mac_address now supports NVMEM under the hood, we need to update the bindings documentation with the new nvmem-cell* properties, which would mean copy&pasting a lot of redundant information to every binding documentation currently referencing some of the MAC address properties. So I've just removed all the references to the optional MAC address properties and replaced them with the small note referencing net/ethernet.txt file. Signed-off-by: Petr Štetiar <ynezz@true.cz> Signed-off-by: David S. Miller <davem@davemloft.net>
88 lines
2.8 KiB
Plaintext
88 lines
2.8 KiB
Plaintext
* Qualcomm QCA7000
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The QCA7000 is a serial-to-powerline bridge with a host interface which could
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be configured either as SPI or UART slave. This configuration is done by
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the QCA7000 firmware.
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(a) Ethernet over SPI
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In order to use the QCA7000 as SPI device it must be defined as a child of a
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SPI master in the device tree.
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Required properties:
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- compatible : Should be "qca,qca7000"
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- reg : Should specify the SPI chip select
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- interrupts : The first cell should specify the index of the source
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interrupt and the second cell should specify the trigger
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type as rising edge
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- spi-cpha : Must be set
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- spi-cpol : Must be set
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Optional properties:
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- spi-max-frequency : Maximum frequency of the SPI bus the chip can operate at.
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Numbers smaller than 1000000 or greater than 16000000
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are invalid. Missing the property will set the SPI
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frequency to 8000000 Hertz.
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- qca,legacy-mode : Set the SPI data transfer of the QCA7000 to legacy mode.
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In this mode the SPI master must toggle the chip select
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between each data word. In burst mode these gaps aren't
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necessary, which is faster. This setting depends on how
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the QCA7000 is setup via GPIO pin strapping. If the
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property is missing the driver defaults to burst mode.
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The MAC address will be determined using the optional properties
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defined in ethernet.txt.
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SPI Example:
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/* Freescale i.MX28 SPI master*/
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ssp2: spi@80014000 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "fsl,imx28-spi";
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pinctrl-names = "default";
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pinctrl-0 = <&spi2_pins_a>;
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qca7000: ethernet@0 {
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compatible = "qca,qca7000";
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reg = <0x0>;
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interrupt-parent = <&gpio3>; /* GPIO Bank 3 */
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interrupts = <25 0x1>; /* Index: 25, rising edge */
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spi-cpha; /* SPI mode: CPHA=1 */
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spi-cpol; /* SPI mode: CPOL=1 */
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spi-max-frequency = <8000000>; /* freq: 8 MHz */
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local-mac-address = [ A0 B0 C0 D0 E0 F0 ];
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};
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};
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(b) Ethernet over UART
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In order to use the QCA7000 as UART slave it must be defined as a child of a
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UART master in the device tree. It is possible to preconfigure the UART
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settings of the QCA7000 firmware, but it's not possible to change them during
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runtime.
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Required properties:
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- compatible : Should be "qca,qca7000"
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Optional properties:
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- local-mac-address : see ./ethernet.txt
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- current-speed : current baud rate of QCA7000 which defaults to 115200
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if absent, see also ../serial/slave-device.txt
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UART Example:
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/* Freescale i.MX28 UART */
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auart0: serial@8006a000 {
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compatible = "fsl,imx28-auart", "fsl,imx23-auart";
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reg = <0x8006a000 0x2000>;
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pinctrl-names = "default";
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pinctrl-0 = <&auart0_2pins_a>;
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qca7000: ethernet {
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compatible = "qca,qca7000";
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local-mac-address = [ A0 B0 C0 D0 E0 F0 ];
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current-speed = <38400>;
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};
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};
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