Documentation: devicetree: add epson rx6110 binding
Add the binding documentation for the Epson RX6110 RTC. Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
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Documentation/devicetree/bindings/rtc/epson,rx6110.txt
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Documentation/devicetree/bindings/rtc/epson,rx6110.txt
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Epson RX6110 Real Time Clock
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============================
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The Epson RX6110 can be used with SPI or I2C busses. The kind of
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bus depends on the SPISEL pin and can not be configured via software.
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I2C mode
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--------
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Required properties:
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- compatible: should be: "epson,rx6110"
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- reg : the I2C address of the device for I2C
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Example:
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rtc: rtc@32 {
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compatible = "epson,rx6110"
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reg = <0x32>;
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};
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SPI mode
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--------
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Required properties:
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- compatible: should be: "epson,rx6110"
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- reg: chip select number
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- spi-cs-high: RX6110 needs chipselect high
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- spi-cpha: RX6110 works with SPI shifted clock phase
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- spi-cpol: RX6110 works with SPI inverse clock polarity
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Example:
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rtc: rtc@3 {
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compatible = "epson,rx6110"
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reg = <3>
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spi-cs-high;
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spi-cpha;
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spi-cpol;
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};
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