From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-bn1on0057.outbound.protection.outlook.com ([157.56.110.57] helo=na01-bn1-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Ya2aM-0006d5-6e for linux-mtd@lists.infradead.org; Mon, 23 Mar 2015 13:40:07 +0000 From: Graham Moore To: Subject: [PATCH V4 1/2] mtd: spi-nor: Bindings for Cadence Quad SPI Flash Controller driver. Date: Mon, 23 Mar 2015 08:36:21 -0500 Message-ID: <1427117782-14764-1-git-send-email-grmoore@opensource.altera.com> MIME-Version: 1.0 Content-Type: text/plain Cc: Alan Tull , Yves Vandervennet , linux-kernel@vger.kernel.org, Dinh Nguyen , Brian Norris , David Woodhouse , Graham Moore List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Signed-off-by: Graham Moore --- V2: Add cdns prefix to driver-specific bindings. V3: Use existing property "is-decoded-cs" instead of creating a duplicate, "ext-decoder". Timing parameters are in nanoseconds, not master reference clocks. Remove bus-num completely. --- .../devicetree/bindings/mtd/cadence_quadspi.txt | 50 ++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/cadence_quadspi.txt diff --git a/Documentation/devicetree/bindings/mtd/cadence_quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence_quadspi.txt new file mode 100644 index 0000000..1cf0d7e --- /dev/null +++ b/Documentation/devicetree/bindings/mtd/cadence_quadspi.txt @@ -0,0 +1,50 @@ +* Cadence Quad SPI controller + +Required properties: +- compatible : Should be "cdns,qspi-nor". +- reg : Contains two entries, each of which is a tuple consisting of a + physical address and length. The first entry is the address and + length of the controller register set. The second entry is the + address and length of the QSPI Controller data area. +- interrupts : Unit interrupt specifier for the controller interrupt. +- clocks : phandle to the Quad SPI clock. +- fifo-depth : Size of the data FIFO in words. + +Optional properties: +- is-decoded-cs : Flag to indicate whether decoder is used or not. + +Optional subnodes: +Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional +custom properties: +- cdns,page-size : Size, in bytes, of the device's write page +- cdns,block-size : Size of the device's erase block +- cdns,read-delay : Delay for read capture logic, in clock cycles +- cdns,tshsl-ns : Delay in nanoseconds for the length that the master mode chip select outputs are de-asserted between transactions. +- cdns,tsd2d-ns : Delay in nanoseconds between one chip select being de-activated and the activation of another. +- cdns,tchsh-ns : Delay in nanoseconds between last bit of current transaction and deasserting the device chip select (qspi_n_ss_out). +- cdns,tslch-ns : Delay in nanoseconds between setting qspi_n_ss_out low and first bit transfer. + +Example: + + qspi: spi@ff705000 { + compatible = "cdns,qspi-nor"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0xff705000 0x1000>, + <0xffa00000 0x1000>; + interrupts = <0 151 4>; + clocks = <&qspi_clk>; + is-decoded-cs = <1>; + fifo-depth = <128>; + + flash0: n25q00@0 { + ... + cdns,page-size = <256>; + cdns,block-size = <16>; + cdns,read-delay = <4>; + cdns,tshsl-ns = <50>; + cdns,tsd2d-ns = <50>; + cdns,tchsh-ns = <4>; + cdns,tslch-ns = <4>; + } + } -- 1.7.9.5