Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754174AbbGWQnd (ORCPT ); Thu, 23 Jul 2015 12:43:33 -0400 Received: from eusmtp01.atmel.com ([212.144.249.242]:31220 "EHLO eusmtp01.atmel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754102AbbGWQm7 (ORCPT ); Thu, 23 Jul 2015 12:42:59 -0400 From: Cyrille Pitchen To: , , , , CC: , , , , , , , , Cyrille Pitchen Subject: [PATCH v7 1/2] mfd: devicetree: add bindings for Atmel Flexcom Date: Thu, 23 Jul 2015 18:42:55 +0200 Message-ID: <60057bbf7d39ec63d391d26271747cf0228a3ed1.1437669004.git.cyrille.pitchen@atmel.com> X-Mailer: git-send-email 1.8.2.2 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3263 Lines: 92 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 --- .../devicetree/bindings/mfd/atmel-flexcom.txt | 68 ++++++++++++++++++++++ 1 file changed, 68 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..a63226b7a9cb --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt @@ -0,0 +1,68 @@ +* 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 pair (offset, size) for the Flexcom + dedicated I/O registers (without USART, TWI or SPI + registers). +- clocks: Should be the Flexcom peripheral clock from PMC. +- #address-cells: Should be <2> +- #size-cells: Should be <1> +- ranges: Should be a list of ranges. + One range per peripheral wrapped by the Flexcom. So each + range is a triplet (child_addr, parent_addr, size). The + first u32 of "child_addr" is the value to be set in the + Operating Mode bitfield of the Flexcom Mode Register. + Then "parent_addr" stores the base address of the + corresponding peripheral in the system memory. Finally, + "size" if the size of the memory region of this + peripheral. + +Required child: +A single available child for the serial controller to enable. + +Required properties of this child: +- reg: Should be a pair (child_addr, size) with child_addr + matching one of the parent ranges. +- clocks: Should be the very same phandle as for the parent's one. + +Other properties remain unchanged. See documentation of the respective device: +- ../serial/atmel-usart.txt +- ../spi/spi_atmel.txt +- ../i2c/i2c-at91.txt + +Example: + +flexcom@f8034000 { + compatible = "atmel,sama5d2-flexcom"; + reg = <0xf8034000 0x200>; + clocks = <&flx0_clk>; + #address-cells = <2>; + #size-cells = <1>; + ranges = <1 0 0xf8034200 0x200 /* opmode 1: USART */ + 2 0 0xf8034400 0x200 /* opmode 2: SPI */ + 3 0 0xf8034600 0x200>; /* opmode 3: I2C */ + + spi@f8034400 { + compatible = "atmel,at91rm9200-spi"; + reg = <2 0 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/