From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anatolij Gustschin Subject: [PATCH v10 1/3] doc: dt: add altera-ps-spi binding document Date: Wed, 17 May 2017 20:23:40 +0200 Message-ID: <1495045422-19183-1-git-send-email-agust@denx.de> Return-path: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: stillcompiling-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, joshua.clayton-DelKAr4a3LpBDgjK7y7TUQ@public.gmane.org, bst-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org Cc: linux-fpga-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, atull-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, moritz.fischer-+aYTwkv1SeIAvxtiuMwx3w@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org List-Id: devicetree@vger.kernel.org From: Joshua Clayton Describe an altera-ps-spi devicetree entry, required features Signed-off-by: Joshua Clayton Acked-by: Rob Herring Signed-off-by: Anatolij Gustschin --- Changes in v10: - fix compatible string in example - add Arria 10 compatible - s/spi/SPI/ - reword to remove entries mentioning cyclone, since it can be used with other FPGAs now (Arria 10, Stratix V) .../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 0000000..3e240b2 --- /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@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>; + }; -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html