Re: [PATCH v2 2/5] doc: dt: add cyclone-spi binding document
From: Rob Herring <hidden>
Date: 2016-10-31 06:16:33
Also in:
linux-arm-kernel, lkml
On Fri, Oct 28, 2016 at 09:56:39AM -0700, Joshua Clayton wrote:
quoted hunk ↗ jump to hunk
Describe a cyclonei-ps-spi devicetree entry, required features Signed-off-by: Joshua Clayton <redacted> --- .../bindings/fpga/cyclone-ps-spi-fpga-mgr.txt | 23 ++++++++++++++++++++++ 1 file changed, 23 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..c942281 --- /dev/null +++ b/Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txt@@ -0,0 +1,23 @@ +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-gpio : config pin (referred to as nCONFIG in the cyclone manual) +- status-gpio : status pin (referred to as nSTATUS in the cyclone manual)
'-gpios' is the preferred form. Looks like active low to me with nXXXX, but the example says active high. Please be specific here.
+
+Example:
+ fpga_spi: evi-fpga-spi@0 {
+ compatible = "altr,cyclone-ps-spi-fpga-mgr";
+ spi-max-frequency = <20000000>;
+ reg = <0>;
+ config-gpio = <&gpio4 9 GPIO_ACTIVE_HIGH>;
+ status-gpio = <&gpio4 11 GPIO_ACTIVE_HIGH>;
+ };
--
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