From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joshua Clayton Subject: [PATCH v2 2/5] doc: dt: add cyclone-spi binding document Date: Fri, 28 Oct 2016 09:56:39 -0700 Message-ID: <2de74f6d2f2689b8ef090a9017db2ffb3bd319cb.1477669745.git.stillcompiling@gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: In-Reply-To: References: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Alan Tull , Moritz Fischer Cc: Mark Rutland , devicetree@vger.kernel.org, Joshua Clayton , Russell King , linux-kernel@vger.kernel.org, Rob Herring , Sascha Hauer , Fabio Estevam , Shawn Guo , linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org Describe a cyclonei-ps-spi devicetree entry, required features Signed-off-by: Joshua Clayton --- .../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.txt diff --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) + +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>; + }; -- 2.7.4