linux-kernel - [PATCH 1/2] spi: qup: Add device tree bindings information

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Message-Id: <1391705868-20091-2-git-send-email-iivanov@mm-sol.com>
Date:	Thu,  6 Feb 2014 18:57:47 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>
Cc:	"Ivan T. Ivanov" <iivanov@...sol.com>, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] spi: qup: Add device tree bindings information

From: "Ivan T. Ivanov" <iivanov@...sol.com>

The Qualcomm Universal Peripheral (QUP) core is an
AHB slave that provides a common data path (an output
FIFO and an input FIFO) for serial peripheral interface
(SPI) mini-core.

Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
---
 .../devicetree/bindings/spi/qcom,spi-qup.txt       |   86 ++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/qcom,spi-qup.txt

diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt b/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
new file mode 100644
index 0000000..74565f1
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
@@ -0,0 +1,86 @@
+Qualcomm Universal Peripheral (QUP) Serial Peripheral Interface (SPI)
+
+The QUP core is an AHB slave that provides a common data path (an output FIFO
+and an input FIFO) for serial peripheral interface (SPI) mini-core.
+
+SPI in master mode support up to 50MHz, up to four chip selects, and a
+programmable data path from 4 bits to 32 bits; supports numerous protocol
+variants.
+
+Required properties:
+- compatible: 		Should contain "qcom,spi-qup-v2".
+- reg: 				Should contain base register location and length
+- interrupts: 		Interrupt number used by this controller
+
+- clocks: 			Should contain the core clock and the AHB clock.
+- clock-names: 		Should be "core" for the core clock and "iface" for the
+                	AHB clock.
+
+- #address-cells: 	Number of cells required to define a chip select
+					address on the SPI bus. Should be set to 1.
+- #size-cells: 		Should be zero.
+
+Optional properties:
+- spi-max-frequency: Specifies maximum SPI clock frequency, Units - Hz. Definition
+                    as per Documentation/devicetree/bindings/spi/spi-bus.txt
+
+SPI slave nodes must be children of the SPI master node and can
+contain properties described in Documentation/devicetree/bindings/spi/spi-bus.txt
+
+Example:
+
+	spi_8: spi@...64000 { /* BLSP2 QUP2 */
+
+		compatible = "qcom,spi-qup-v2";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0xf9964000 0x1000>;
+		interrupts = <0 102 0>;
+		spi-max-frequency = <19200000>;
+
+		clocks = <&gcc GCC_BLSP2_QUP2_SPI_APPS_CLK>, <&gcc GCC_BLSP2_AHB_CLK>;
+		clock-names = "core", "iface";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&spi8_default>;
+
+		device@0 {
+			compatible = "arm,pl022-dummy";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <0>; /* Chip select 0 */
+			spi-max-frequency = <19200000>;
+			spi-cpol;
+		};
+
+		device@1 {
+			compatible = "arm,pl022-dummy";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <1>; /* Chip select 1 */
+			spi-max-frequency = <9600000>;
+			spi-cpha;
+		};
+
+		device@2 {
+			compatible = "arm,pl022-dummy";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <2>; /* Chip select 2 */
+			spi-max-frequency = <19200000>;
+			spi-cpol;
+			spi-cpha;
+		};
+
+		device@3 {
+			compatible = "arm,pl022-dummy";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <3>; /* Chip select 3 */
+			spi-max-frequency = <19200000>;
+			spi-cpol;
+			spi-cpha;
+			spi-cs-high;
+		};
+	};
+
-- 
1.7.9.5

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