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Maximum speed supported by spfi is limited to 1/4 of the spfi clock. But in some SoCs the maximum speed supported by the spfi block can be limited to less than 1/4 of the spfi clock. In such cases we have to define the limit in the device tree so that the driver can pick it up. Signed-off-by: Sifan Naeem <sifan.naeem@imgtec.com> Signed-off-by: Mark Brown <broonie@kernel.org>
40 lines
1.2 KiB
Plaintext
40 lines
1.2 KiB
Plaintext
IMG Synchronous Peripheral Flash Interface (SPFI) controller
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Required properties:
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- compatible: Must be "img,spfi".
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- reg: Must contain the base address and length of the SPFI registers.
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- interrupts: Must contain the SPFI interrupt.
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- clocks: Must contain an entry for each entry in clock-names.
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See ../clock/clock-bindings.txt for details.
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- clock-names: Must include the following entries:
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- spfi: SPI operating clock
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- sys: SPI system interface clock
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- dmas: Must contain an entry for each entry in dma-names.
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See ../dma/dma.txt for details.
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- dma-names: Must include the following entries:
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- rx
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- tx
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- cs-gpios: Must specify the GPIOs used for chipselect lines.
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- #address-cells: Must be 1.
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- #size-cells: Must be 0.
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Optional properties:
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- img,supports-quad-mode: Should be set if the interface supports quad mode
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SPI transfers.
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- spfi-max-frequency: Maximum speed supported by the spfi block.
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Example:
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spi@18100f00 {
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compatible = "img,spfi";
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reg = <0x18100f00 0x100>;
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interrupts = <GIC_SHARED 22 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&spi_clk>, <&system_clk>;
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clock-names = "spfi", "sys";
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dmas = <&mdc 9 0xffffffff 0>, <&mdc 10 0xffffffff 0>;
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dma-names = "rx", "tx";
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#address-cells = <1>;
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#size-cells = <0>;
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};
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