linux-kernel - [RFC PATCH 2/2] dt-bindings: spi: QuadSPI driver for Atmel SAMA5D2 documentation

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Date:   Mon, 18 Jun 2018 18:21:24 +0200
From:   Piotr Bugalski <bugalski.piotr@...il.com>
To:     Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Cyrille Pitchen <cyrille.pitchen@...rochip.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Piotr Bugalski <bugalski.piotr@...il.com>,
        Piotr Bugalski <pbu@...ptera.com>
Subject: [RFC PATCH 2/2] dt-bindings: spi: QuadSPI driver for Atmel SAMA5D2 documentation

Documentation for DT-binding change.

Suggested-by: Boris Brezillon <boris.brezillon@...tlin.com>
Signed-off-by: Piotr Bugalski <pbu@...ptera.com>

---
 .../devicetree/bindings/spi/spi_atmel-qspi.txt     | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/spi_atmel-qspi.txt

diff --git a/Documentation/devicetree/bindings/spi/spi_atmel-qspi.txt b/Documentation/devicetree/bindings/spi/spi_atmel-qspi.txt
new file mode 100644
index 000000000000..d52b534c9c2b
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi_atmel-qspi.txt
@@ -0,0 +1,41 @@
+* Atmel Quad Serial Peripheral Interface (QSPI)
+
+Required properties:
+- compatible:     Should be "atmel,sama5d2-spi-qspi".
+- reg:            Should contain the locations and lengths of the base registers
+                  and the mapped memory.
+- reg-names:      Should contain the resource reg names:
+                  - qspi_base: configuration register address space
+                  - qspi_mmap: memory mapped address space
+- interrupts:     Should contain the interrupt for the device.
+- clocks:         The phandle of the clock needed by the QSPI controller.
+- #address-cells: Should be <1>.
+- #size-cells:    Should be <0>.
+
+Example:
+
+qspi1: spi@...24000 {
+	compatible = "atmel,sama5d2-spi-qspi";
+	reg = <0xf0024000 0x100>, <0xd8000000 0x08000000>;
+	reg-names = "qspi_base", "qspi_mmap";
+	interrupts = <53 IRQ_TYPE_LEVEL_HIGH 7>;
+	clocks = <&qspi1_clk>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_qspi1_default>;
+	status = "okay";
+
+	flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "winbond,w25m02gv", "spi-nand";
+		reg = <0>;
+		spi-max-frequency = <83000000>;
+		spi-rx-bus-width = <4>;
+		spi-tx-bus-width = <4>;
+
+		...
+	};
+};
+
-- 
2.11.0