32cde0b514
When booting with device-tree, retrieve GPMC settings for ONENAND from the device-tree blob. This will allow us to remove all static settings stored in the gpmc-nand.c in the future once the migration to device-tree is complete. The user must now specify the ONENAND device width in the device-tree binding so that the GPMC can be programmed correctly. Therefore, update the device-tree binding documentation for ONENAND devices connected to the GPMC to reflect this. Please note that this does not include GPMC timings for ONENAND. The timings are being calculated at runtime. There is some legacy code that only enables read wait monitoring for non-OMAP3 devices. There are no known OMAP3 device issues that prevent this feature being enabled and so when booting with device-tree use the wait-monitoring settings described in the device-tree blob. Signed-off-by: Jon Hunter <jon-hunter@ti.com> Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
46 lines
1.1 KiB
Text
46 lines
1.1 KiB
Text
Device tree bindings for GPMC connected OneNANDs
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GPMC connected OneNAND (found on OMAP boards) are represented as child nodes of
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the GPMC controller with a name of "onenand".
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All timing relevant properties as well as generic gpmc child properties are
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explained in a separate documents - please refer to
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Documentation/devicetree/bindings/bus/ti-gpmc.txt
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Required properties:
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- reg: The CS line the peripheral is connected to
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- gpmc,device-width Width of the ONENAND device connected to the GPMC
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in bytes. Must be 1 or 2.
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Optional properties:
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- dma-channel: DMA Channel index
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For inline partiton table parsing (optional):
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- #address-cells: should be set to 1
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- #size-cells: should be set to 1
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Example for an OMAP3430 board:
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gpmc: gpmc@6e000000 {
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compatible = "ti,omap3430-gpmc";
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ti,hwmods = "gpmc";
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reg = <0x6e000000 0x1000000>;
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interrupts = <20>;
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gpmc,num-cs = <8>;
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gpmc,num-waitpins = <4>;
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#address-cells = <2>;
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#size-cells = <1>;
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onenand@0 {
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reg = <0 0 0>; /* CS0, offset 0 */
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gpmc,device-width = <2>;
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#address-cells = <1>;
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#size-cells = <1>;
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/* partitions go here */
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};
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};
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