1* Qualcomm QCA7000 2 3The QCA7000 is a serial-to-powerline bridge with a host interface which could 4be configured either as SPI or UART slave. This configuration is done by 5the QCA7000 firmware. 6 7(a) Ethernet over SPI 8 9In order to use the QCA7000 as SPI device it must be defined as a child of a 10SPI master in the device tree. 11 12Required properties: 13- compatible : Should be "qca,qca7000" 14- reg : Should specify the SPI chip select 15- interrupts : The first cell should specify the index of the source 16 interrupt and the second cell should specify the trigger 17 type as rising edge 18- spi-cpha : Must be set 19- spi-cpol : Must be set 20 21Optional properties: 22- spi-max-frequency : Maximum frequency of the SPI bus the chip can operate at. 23 Numbers smaller than 1000000 or greater than 16000000 24 are invalid. Missing the property will set the SPI 25 frequency to 8000000 Hertz. 26- qca,legacy-mode : Set the SPI data transfer of the QCA7000 to legacy mode. 27 In this mode the SPI master must toggle the chip select 28 between each data word. In burst mode these gaps aren't 29 necessary, which is faster. This setting depends on how 30 the QCA7000 is setup via GPIO pin strapping. If the 31 property is missing the driver defaults to burst mode. 32 33The MAC address will be determined using the optional properties 34defined in ethernet.txt. 35 36SPI Example: 37 38/* Freescale i.MX28 SPI master*/ 39ssp2: spi@80014000 { 40 #address-cells = <1>; 41 #size-cells = <0>; 42 compatible = "fsl,imx28-spi"; 43 pinctrl-names = "default"; 44 pinctrl-0 = <&spi2_pins_a>; 45 46 qca7000: ethernet@0 { 47 compatible = "qca,qca7000"; 48 reg = <0x0>; 49 interrupt-parent = <&gpio3>; /* GPIO Bank 3 */ 50 interrupts = <25 0x1>; /* Index: 25, rising edge */ 51 spi-cpha; /* SPI mode: CPHA=1 */ 52 spi-cpol; /* SPI mode: CPOL=1 */ 53 spi-max-frequency = <8000000>; /* freq: 8 MHz */ 54 local-mac-address = [ A0 B0 C0 D0 E0 F0 ]; 55 }; 56}; 57 58(b) Ethernet over UART 59 60In order to use the QCA7000 as UART slave it must be defined as a child of a 61UART master in the device tree. It is possible to preconfigure the UART 62settings of the QCA7000 firmware, but it's not possible to change them during 63runtime. 64 65Required properties: 66- compatible : Should be "qca,qca7000" 67 68Optional properties: 69- local-mac-address : see ./ethernet.txt 70- current-speed : current baud rate of QCA7000 which defaults to 115200 71 if absent, see also ../serial/serial.yaml 72 73UART Example: 74 75/* Freescale i.MX28 UART */ 76auart0: serial@8006a000 { 77 compatible = "fsl,imx28-auart", "fsl,imx23-auart"; 78 reg = <0x8006a000 0x2000>; 79 pinctrl-names = "default"; 80 pinctrl-0 = <&auart0_2pins_a>; 81 82 qca7000: ethernet { 83 compatible = "qca,qca7000"; 84 local-mac-address = [ A0 B0 C0 D0 E0 F0 ]; 85 current-speed = <38400>; 86 }; 87}; 88