[PATCH v11 2/6] doc: dt: add altera-ps-spi binding document
From: Joshua Clayton <hidden>
Date: 2017-05-25 17:31:21
Also in:
linux-devicetree, lkml
Subsystem:
fpga manager framework, open firmware and flattened device tree bindings, the rest · Maintainers:
Moritz Fischer, Xu Yilun, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Describe an altera-ps-spi devicetree entry, required features Signed-off-by: Joshua Clayton <redacted> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Anatolij Gustschin <agust@denx.de> --- .../bindings/fpga/altera-passive-serial.txt | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/altera-passive-serial.txt
diff --git a/Documentation/devicetree/bindings/fpga/altera-passive-serial.txt b/Documentation/devicetree/bindings/fpga/altera-passive-serial.txt
new file mode 100644
index 000000000000..3e240b281f21
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/altera-passive-serial.txt@@ -0,0 +1,29 @@ +Altera Passive Serial SPI FPGA Manager + +Altera 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: Must be one of the following: + "altr,fpga-passive-serial", + "altr,fpga-arria10-passive-serial" +- reg: SPI chip select of the FPGA +- nconfig-gpios: config pin (referred to as nCONFIG in the manual) +- nstat-gpios: status pin (referred to as nSTATUS in the manual) + +Optional properties: +- confd-gpios: confd pin (referred to as CONF_DONE in the manual) + +Example: + fpga_spi: evi-fpga-spi at 0 { + compatible = "altr,fpga-passive-serial"; + spi-max-frequency = <20000000>; + reg = <0>; + nconfig-gpios = <&gpio4 9 GPIO_ACTIVE_LOW>; + nstat-gpios = <&gpio4 11 GPIO_ACTIVE_LOW>; + confd-gpios = <&gpio4 12 GPIO_ACTIVE_LOW>; + };
--
2.11.0