Re: [PATCH v6 3/5] doc: dt: add cyclone-ps-spi binding document
From: Alan Tull <atull@kernel.org>
Date: 2016-12-19 02:19:59
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linux-arm-kernel, lkml
On Fri, 16 Dec 2016, Joshua Clayton wrote:
Describe a cyclone-ps-spi devicetree entry, required features Signed-off-by: Joshua Clayton <redacted> Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Alan Tull <redacted>
quoted hunk ↗ jump to hunk
--- .../bindings/fpga/cyclone-ps-spi-fpga-mgr.txt | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txtdiff --git a/Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txt b/Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txt new file mode 100644 index 0000000..3f515c7 --- /dev/null +++ b/Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txt@@ -0,0 +1,25 @@ +Altera Cyclone Passive Serial SPI FPGA Manager + +Altera Cyclone FPGAs support a method of loading the bitstream over what is +referred to as "passive serial". +The passive serial link is not technically spi, and might require extra +circuits in order to play nicely with other spi slaves on the same bus. + +See https://www.altera.com/literature/hb/cyc/cyc_c51013.pdf + +Required properties: +- compatible : should contain "altr,cyclone-ps-spi-fpga-mgr" +- reg : spi slave id of the fpga +- config-gpios : config pin (referred to as nCONFIG in the cyclone manual) +- status-gpios : status pin (referred to as nSTATUS in the cyclone manual) + +both gpios pins are normally active low open drain. + +Example: + fpga_spi: evi-fpga-spi@0 { + compatible = "altr,cyclone-ps-spi-fpga-mgr"; + spi-max-frequency = <20000000>; + reg = <0>; + config-gpios = <&gpio4 9 GPIO_ACTIVE_LOW>; + status-gpios = <&gpio4 11 GPIO_ACTIVE_LOW>; + };-- 2.9.3