Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>lime2-spi
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GPIO via CREG (control registers) driver |
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31 9 7 5 0 < bit number |
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[ not used | gpio-1 | gpio-0 | <-shift-> ] < 32 bit register |
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^ ^ |
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write 0x2 == set output to "1" (activate) |
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write 0x3 == set output to "0" (deactivate) |
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Required properties: |
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- compatible : "snps,creg-gpio" |
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- reg : Exactly one register range with length 0x4. |
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- #gpio-cells : Should be one - the pin number. |
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- gpio-controller : Marks the device node as a GPIO controller. |
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- gpio-count: Number of GPIO pins. |
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- gpio-bit-per-line: Number of bits per gpio line (see picture). |
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- gpio-first-shift: Shift (in bits) of the first GPIO field in register |
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(see picture). |
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- gpio-activate-val: Value should be set in corresponding field to set |
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output to "1" (see picture). Applied to all GPIO ports. |
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- gpio-deactivate-val: Value should be set in corresponding field to set |
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output to "0" (see picture). Applied to all GPIO ports. |
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Optional properties: |
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- gpio-bank-name: name of bank (as default driver name is used is used) |
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- gpio-default-val: array of default output values (must me 0 or 1) |
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Example (see picture): |
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gpio: gpio@f00014b0 { |
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compatible = "snps,creg-gpio"; |
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reg = <0xf00014b0 0x4>; |
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gpio-controller; |
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#gpio-cells = <1>; |
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gpio-bank-name = "hsdk-spi-cs"; |
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gpio-count = <2>; |
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gpio-first-shift = <5>; |
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gpio-bit-per-line = <2>; |
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gpio-activate-val = <2>; |
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gpio-deactivate-val = <3>; |
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gpio-default-val = <1 1>; |
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}; |
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