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From: Anatolij Gustschin <agust-ynQEQJNshbs@public.gmane.org>
To: linux-fpga-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Alan Tull
	<atull-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>,
	Moritz Fischer
	<moritz.fischer-+aYTwkv1SeIAvxtiuMwx3w@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Michal Simek
	<michal.simek-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
Subject: [PATCH v3 1/2] dt: bindings: fpga: add xilinx slave-serial binding description
Date: Wed, 22 Feb 2017 11:39:10 +0100	[thread overview]
Message-ID: <1487759951-20711-2-git-send-email-agust@denx.de> (raw)
In-Reply-To: <1487759951-20711-1-git-send-email-agust-ynQEQJNshbs@public.gmane.org>

Add dt binding documentation details for Xilinx FPGA configuration
over slave serial interface.

Signed-off-by: Anatolij Gustschin <agust-ynQEQJNshbs@public.gmane.org>
---
Changes in v3:

 - extend example to show the usage in SPI master node, connected
   to the fpga-region node

Changes in v2:

 - correct gpios properties in example to match above description

 - use fpga-mgr@0 instead of fpga-spi@0 in example

 .../bindings/fpga/xilinx-slave-serial.txt          | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/xilinx-slave-serial.txt

diff --git a/Documentation/devicetree/bindings/fpga/xilinx-slave-serial.txt b/Documentation/devicetree/bindings/fpga/xilinx-slave-serial.txt
new file mode 100644
index 0000000..9766f74
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/xilinx-slave-serial.txt
@@ -0,0 +1,44 @@
+Xilinx Slave Serial SPI FPGA Manager
+
+Xilinx Spartan-6 FPGAs support a method of loading the bitstream over
+what is referred to as "slave serial" interface.
+The slave 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.xilinx.com/support/documentation/user_guides/ug380.pdf
+
+Required properties:
+- compatible: should contain "xlnx,fpga-slave-serial"
+- reg: spi chip select of the FPGA
+- prog_b-gpios: config pin (referred to as PROGRAM_B in the manual)
+- done-gpios: config status pin (referred to as DONE in the manual)
+
+Example for full FPGA configuration:
+
+	fpga-region0 {
+		compatible = "fpga-region";
+		fpga-mgr = <&fpga_mgr_spi>;
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+	};
+
+	spi1: spi@10680 {
+		compatible = "marvell,armada-xp-spi", "marvell,orion-spi";
+		pinctrl-0 = <&spi0_pins>;
+		pinctrl-names = "default";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		cell-index = <1>;
+		interrupts = <92>;
+		clocks = <&coreclk 0>;
+		status = "okay";
+
+		fpga_mgr_spi: fpga-mgr@0 {
+			compatible = "xlnx,fpga-slave-serial";
+			spi-max-frequency = <60000000>;
+			spi-cpha;
+			reg = <0>;
+			done-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
+			prog_b-gpios = <&gpio0 29 GPIO_ACTIVE_LOW>;
+		};
+	};
-- 
2.7.4

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  parent reply	other threads:[~2017-02-22 10:39 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-22 10:39 [PATCH v3 0/2] Xilinx Slave Serial FPGA Manager Anatolij Gustschin
     [not found] ` <1487759951-20711-1-git-send-email-agust-ynQEQJNshbs@public.gmane.org>
2017-02-22 10:39   ` Anatolij Gustschin [this message]
     [not found]     ` <1487759951-20711-2-git-send-email-agust-ynQEQJNshbs@public.gmane.org>
2017-02-27 22:39       ` [PATCH v3 1/2] dt: bindings: fpga: add xilinx slave-serial binding description Rob Herring
2017-02-22 10:39   ` [PATCH v3 2/2] fpga manager: Add Xilinx slave serial SPI driver Anatolij Gustschin
     [not found]     ` <1487759951-20711-3-git-send-email-agust-ynQEQJNshbs@public.gmane.org>
2017-02-22 15:04       ` Michal Simek
     [not found]         ` <e9620f07-48bd-1f83-a686-6874becbba86-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
2017-02-23  9:28           ` Anatolij Gustschin
2017-02-23  9:33             ` Michal Simek

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