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Message-ID: <547F24B6.8070504@atmel.com>
Date: Wed, 3 Dec 2014 15:56:54 +0100
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: Boris Brezillon <boris.brezillon@...e-electrons.com>,
"Jean-Christophe Plagniol-Villard" <plagnioj@...osoft.com>,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
Andrew Victor <linux@...im.org.za>,
Samuel Ortiz <sameo@...ux.intel.com>,
Lee Jones <lee.jones@...aro.org>
CC: 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>,
<devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, "Arnd Bergmann" <arnd@...db.de>,
Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: Re: [PATCH v3 06/11] memory: atmel-ebi: add DT bindings documentation
Le 01/12/2014 11:27, Boris Brezillon a écrit :
> The EBI (External Bus Interface) is used to access external peripherals
> (NOR, SRAM, NAND, and other specific devices like ethernet controllers).
> Each device is assigned a CS line and an address range and can have its
> own configuration (timings, access mode, bus width, ...).
> This driver provides a generic DT binding to configure a device according
> to its requirements.
> For specific device controllers (like the NAND one) the SMC timings
> should be configured by the controller driver through the matrix and smc
> syscon regmaps.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
> .../bindings/memory-controllers/atmel-ebi.txt | 155 +++++++++++++++++++++
> 1 file changed, 155 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/memory-controllers/atmel-ebi.txt
>
> diff --git a/Documentation/devicetree/bindings/memory-controllers/atmel-ebi.txt b/Documentation/devicetree/bindings/memory-controllers/atmel-ebi.txt
> new file mode 100644
> index 0000000..3749ea1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/memory-controllers/atmel-ebi.txt
> @@ -0,0 +1,155 @@
> +* Device tree bindings for Atmel EBI
> +
> +The External Bus Interface (EBI) controller is a bus where you can connect
> +asynchronous (NAND, NOR, SRAM, ....) and synchronous memories (SDR/DDR SDRAMs).
> +The EBI provides a glue-less interface to asynchronous memories though the SMC
> +(Static Memory Controller).
> +Synchronous memories (and some asynchronous memories like NANDs) can be
> +attached to specialized controllers which are responsible for configuring the
> +bus appropriately according to the connected device.
> +In the other hand, the bus interface can be automated for simple asynchronous
> +devices.
> +
> +Required properties:
> +
> +- compatible: "atmel,at91sam9260-ebi"
> + "atmel,at91sam9261-ebi"
> + "atmel,at91sam9263-ebi0"
> + "atmel,at91sam9263-ebi1"
Ditto: 9263 twice.
> + "atmel,at91sam9g45-ebi"
> + "atmel,at91sam9x5-ebi"
> + "atmel,sama5d3-ebi"
> +
> +- reg: Contains offset/length value for EBI memory mapping.
> + This property might contain several entries if the EBI
> + memory range is not contiguous
> +
> +- #address-cells: Must be 2.
> + The first cell encodes the CS.
> + The second cell encode the offset into the CS memory
> + range.
> +
> +- #size-cells: Must be set to 1.
> +
> +- ranges: Encodes CS to memory region association.
> +
> +- clocks: Clock feeding the EBI controller.
> + See clock-bindings.txt
> +
> +Child chip-select (cs) nodes contain the memory devices nodes connected to
> +such as NOR (e.g. cfi-flash) and NAND.
> +There might be board specific devices like FPGAs.
> +You'll define you device requirements in these child nodes.
> +
> +Required child cs node properties:
> +
> +- #address-cells: Must be 2.
> +
> +- #size-cells: Must be 1.
> +
> +- ranges: Empty property indicating that child nodes can inherit
> + memory layout.
> +
> +Optional child cs node properties:
> +- atmel,generic-dev boolean property specifying if the device is
> + a generic device.
> + The following properties are only parsed if
> + this property is present.
> + Specialized devices are attached to specialized
> + controllers which are responsible for
> + configuring the bus appropriately.
> + Here are some examples of specialized
> + controllers: NAND, CompactFlash, SDR-SDRAM.
> +
> +- atmel,bus-width: width of the asynchronous device's data bus
> + 8, 16 or 32.
> + 8 if not present.
> +
> +- atmel,byte-access-type "write" or "select" (see Atmel datasheet).
> + "select" if not present.
> +
> +- atmel,read-mode "nrd" or "ncs".
> + "ncs" is not present.
> +
> +- atmel,write-mode "nwe" or "ncs".
> + "ncs" is not present.
> +
> +- atmel,exnw-mode "disabled", "frozen" or "ready".
> + "disabled" if not present.
> +
> +- atmel,page-mode enable page mode if present. The provided value
> + defines the page size (supported values: 4, 8,
> + 16 and 32).
> +
> +Optional device timings expressed in nanoseconds (if the property is not
> +present 0 is assumed):
> +
> +- atmel,ncs-rd-setup-ns
> +- atmel,nrd-setup-ns
> +- atmel,ncs-wr-setup-ns
> +- atmel,nwe-setup-ns
> +- atmel,ncs-rd-pulse-ns
> +- atmel,nrd-pulse-ns
> +- atmel,ncs-wr-pulse-ns
> +- atmel,nwe-pulse-ns
> +- atmel,nwe-cycle-ns
> +- atmel,nrd-cycle-ns
> +- atmel,tdf-ns
> +
> +- atmel,tdf-optimized data float optimized mode. If present the data
> + float time is optimized depending on the next
> + device being accessed (next device setup
> + time is substracted to the current devive data
Typo: subtract, device
> + float time).
> +
> +
> +
> +Example:
> +
> + ebi: ebi@...00000 {
> + compatible = "atmel,sama5d3-ebi", "simple-bus";
> + #address-cells = <2>;
> + #size-cells = <1>;
> + atmel,smc = <&hsmc>;
> + atmel,matrix = <&matrix>;
> + reg = <0x10000000 0x10000000
> + 0x40000000 0x30000000>;
> + ranges = <0x0 0x0 0x10000000 0x10000000
> + 0x1 0x0 0x40000000 0x10000000
> + 0x2 0x0 0x50000000 0x10000000
> + 0x3 0x0 0x60000000 0x10000000>;
> + clocks = <&mck>;
> +
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_ebi_addr>;
> +
> + cs@0 {
> + #address-cells = <2>;
> + #size-cells = <1>;
> + ranges;
> + atmel,generic-dev;
> + atmel,read-mode = "nrd";
> + atmel,write-mode = "nwe";
> + atmel,bus-width = <16>;
> + atmel,ncs-rd-setup-ns = <0>;
> + atmel,ncs-wr-setup-ns = <0>;
> + atmel,nwe-setup-ns = <8>;
> + atmel,nrd-setup-ns = <16>;
> + atmel,ncs-rd-pulse-ns = <84>;
> + atmel,ncs-wr-pulse-ns = <84>;
> + atmel,nrd-pulse-ns = <76>;
> + atmel,nwe-pulse-ns = <76>;
> + atmel,nrd-cycle-ns = <107>;
> + atmel,nwe-cycle-ns = <84>;
> + atmel,tdf-ns = <16>;
> +
> + nor: flash@0,0 {
> + compatible = "cfi-flash";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + reg = <0x0 0x0 0x1000000>;
> + bank-width = <2>;
> + };
> + };
> + };
> +
>
--
Nicolas Ferre
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