On 13/04/2018 at 18:23, Alexandre Belloni wrote:
On 13/04/2018 19:11:16+0300, Radu Pirea wrote:These are bindings for at91-usart IP in spi spi mode. There is no support for internal chip select. Only kind of chip selects available are gpio chip selects. Signed-off-by: Radu Pirea <radu.pirea@xxxxxxxxxxxxx> --- .../bindings/spi/microchip,at91-usart-spi.txt | 24 +++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 Documentation/devicetree/bindings/spi/microchip,at91-usart-spi.txt diff --git a/Documentation/devicetree/bindings/spi/microchip,at91-usart-spi.txt b/Documentation/devicetree/bindings/spi/microchip,at91-usart-spi.txt new file mode 100644 index 000000000000..92d33ccdffae --- /dev/null +++ b/Documentation/devicetree/bindings/spi/microchip,at91-usart-spi.txt @@ -0,0 +1,24 @@ +* Universal Synchronous Asynchronous Receiver/Transmitter (USART) in SPI mode + +Required properties: +- #size-cells : Must be <0> +- #address-cells : Must be <1> +- compatible: Should be "microchip,at91sam9g45-usart-spi" or "microchip,sama5d2-usart-spi" +- reg: Should contain registers location and length +- interrupts: Should contain interrupt +- clocks: phandles to input clocks. +- clock-names: tuple listing input clock names. + Required elements: "usart" +- cs-gpios: chipselects (internal cs not supported) + +Example: + spi0: spi@f001c000 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "microchip,sama5d2-usart-spi", "microchip,at91sam9g45-usart-spi";I'm pretty sure this will be considered configuration rather than hardware description. Why don't you do something like the flexcom mode selection?
Because we are not in the same situation as having a glue layer that would select one of the already existing peripherals with associated drivers above. This layout of the hardware is completely different from the USART one and it seems to makes sense to address it with a different hardware description and so a different compatible string.
Regards, Nicolas
+ reg = <0xf001c000 0x100>; + interrupts = <12 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&usart0_clk>; + clock-names = "usart"; + cs-gpios = <&pioB 3 0>; + }; -- 2.17.0
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