linux-kernel - [PATCH v8 2/3] Documentation: Add binding document for Lattice iCE40 FPGA manager

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Message-Id: <1478486962-26794-2-git-send-email-joel@airwebreathe.org.uk>
Date:   Sun,  6 Nov 2016 19:49:21 -0700
From:   Joel Holdsworth <joel@...webreathe.org.uk>
To:     atull@...nsource.altera.com, moritz.fischer@...us.com,
        geert@...ux-m68k.org, robh@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        marex@...x.de, clifford@...fford.at
Cc:     Joel Holdsworth <joel@...webreathe.org.uk>
Subject: [PATCH v8 2/3] Documentation: Add binding document for Lattice iCE40 FPGA manager

This adds documentation of the device tree bindings of the Lattice iCE40
FPGA driver for the FPGA manager framework.

Signed-off-by: Joel Holdsworth <joel@...webreathe.org.uk>
---
 .../bindings/fpga/lattice-ice40-fpga-mgr.txt        | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt

diff --git a/Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt b/Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt
new file mode 100644
index 0000000..7e7a78b
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt
@@ -0,0 +1,21 @@
+Lattice iCE40 FPGA Manager
+
+Required properties:
+- compatible:		Should contain "lattice,ice40-fpga-mgr"
+- reg:			SPI chip select
+- spi-max-frequency:	Maximum SPI frequency (>=1000000, <=25000000)
+- cdone-gpios:		GPIO input connected to CDONE pin
+- reset-gpios:		Active-low GPIO output connected to CRESET_B pin. Note
+			that unless the GPIO is held low during startup, the
+			FPGA will enter Master SPI mode and drive SCK with a
+			clock signal potentially jamming other devices on the
+			bus until the firmware is loaded.
+
+Example:
+	ice40: ice40@0 {
+		compatible = "lattice,ice40-fpga-mgr";
+		reg = <0>;
+		spi-max-frequency = <1000000>;
+		cdone-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+	};
-- 
2.7.4