linux-kernel - [PATCH linux-next v9 2/3] mfd: devicetree: add bindings for Atmel Flexcom

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Message-ID: <90fa2e0ded92567a29c996658153d833aaa5e411.1441118159.git.cyrille.pitchen@atmel.com>
Date:	Tue, 1 Sep 2015 16:46:42 +0200
From:	Cyrille Pitchen <cyrille.pitchen@...el.com>
To:	<nicolas.ferre@...el.com>, <boris.brezillon@...e-electrons.com>,
	<alexandre.belloni@...e-electrons.com>, <sameo@...ux.intel.com>,
	<lee.jones@...aro.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<devicetree@...r.kernel.org>,
	Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: [PATCH linux-next v9 2/3] mfd: devicetree: add bindings for Atmel Flexcom

This patch documents the DT bindings for the Atmel Flexcom which will be
introduced by sama5d2x SoCs. These bindings will be used by the actual
Flexcom driver to be sent in another patch.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 .../devicetree/bindings/mfd/atmel-flexcom.txt      | 67 ++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/atmel-flexcom.txt

diff --git a/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt b/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt
new file mode 100644
index 000000000000..fc3511e41542
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt
@@ -0,0 +1,67 @@
+* Device tree bindings for Atmel Flexcom (Flexible Serial Communication Unit)
+
+The Atmel Flexcom is just a wrapper which embeds a SPI controller, an I2C
+controller and an USART. Only one function can be used at a time and is chosen
+at boot time according to the device tree.
+
+Required properties:
+- compatible:		Should be "atmel,sama5d2-flexcom"
+- reg:			Should be the offset/length value for Flexcom dedicated
+			I/O registers (without USART, TWI or SPI registers).
+- clocks:		Should be the Flexcom peripheral clock from PMC.
+- #address-cells:	Should be <1>
+- #size-cells:		Should be <1>
+- ranges:		Should be one range for the full I/O register region
+			(including USART, TWI and SPI registers).
+- atmel,flexcom-mode:	Should be one of the 3 following macros as defined in
+			include/dt-bindings/mfd/atmel-flexcom.h:
+			- ATMEL_FLEXCOM_MODE_USART for USART
+			- ATMEL_FLEXCOM_MODE_SPI for SPI
+			- ATMEL_FLEXCOM_MODE_TWI for I2C
+
+Required child:
+a single child device of type matching the "atmel,flexcom-mode" property.
+
+The reg property of this child should be:
+- <0x200 0x200> for USART
+- <0x400 0x200> for SPI
+- <0x600 0x200> for I2C
+
+The phandle provided by the clocks property of the child is the same as one for
+the Flexcom parent.
+
+Other properties remain unchanged. See documentation of the respective device:
+- ../serial/atmel-usart.txt
+- ../spi/spi_atmel.txt
+- ../i2c/i2c-at91.txt
+
+Example:
+
+flexcom@...34000 {
+	compatible = "atmel,sama5d2-flexcom";
+	reg = <0xf8034000 0x200>;
+	clocks = <&flx0_clk>;
+	#address-cells = <1>;
+	#size-cells = <1>;
+	ranges = <0x0 0xf8034000 0x800>;
+	atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_SPI>;
+
+	spi@400 {
+		compatible = "atmel,at91rm9200-spi";
+		reg = <0x400 0x200>;
+		interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_flx0_default>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		clocks = <&flx0_clk>;
+		clock-names = "spi_clk";
+		atmel,fifo-size = <32>;
+
+		mtd_dataflash@0 {
+			compatible = "atmel,at25f512b";
+			reg = <0>;
+			spi-max-frequency = <20000000>;
+		};
+	};
+};
-- 
1.8.2.2

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