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Some architectures supports only 16-bit or 32-bit read/write access to their IO space. Add a 'reg-io-width' platform and OF parameter which specifies the IO width to support these platforms. reg-io-width can be specified as 1, 2 or 4, and has a default value of 1 if it is unspecified. Signed-off-by: Ganesan Ramalingam <ganesanr@broadcom.com> Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
34 lines
885 B
Plaintext
34 lines
885 B
Plaintext
Device tree configuration for i2c-ocores
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Required properties:
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- compatible : "opencores,i2c-ocores"
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- reg : bus address start and address range size of device
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- interrupts : interrupt number
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- clock-frequency : frequency of bus clock in Hz
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- #address-cells : should be <1>
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- #size-cells : should be <0>
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Optional properties:
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- reg-shift : device register offsets are shifted by this value
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- reg-io-width : io register width in bytes (1, 2 or 4)
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- regstep : deprecated, use reg-shift above
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Example:
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i2c0: ocores@a0000000 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "opencores,i2c-ocores";
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reg = <0xa0000000 0x8>;
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interrupts = <10>;
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clock-frequency = <20000000>;
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reg-shift = <0>; /* 8 bit registers */
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reg-io-width = <1>; /* 8 bit read/write */
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dummy@60 {
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compatible = "dummy";
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reg = <0x60>;
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};
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};
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