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b2497c1a7d
As a kernel newcomer, I got bitten by lack of examples on this front. I
had troubles figuring out where these clocks could be defined ("/clocks"
is where the generic infrastructure expects them).
One should also ensure that a unique name is used. Generic names such as
"osc" tend to be already used by some board-wide clock crystals.
Signed-off-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
51 lines
1.4 KiB
Plaintext
51 lines
1.4 KiB
Plaintext
* Maxim MAX310X advanced Universal Asynchronous Receiver-Transmitter (UART)
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Required properties:
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- compatible: Should be one of the following:
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- "maxim,max3107" for Maxim MAX3107,
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- "maxim,max3108" for Maxim MAX3108,
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- "maxim,max3109" for Maxim MAX3109,
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- "maxim,max14830" for Maxim MAX14830.
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- reg: SPI chip select number.
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- interrupt-parent: The phandle for the interrupt controller that
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services interrupts for this IC.
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- interrupts: Specifies the interrupt source of the parent interrupt
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controller. The format of the interrupt specifier depends on the
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parent interrupt controller.
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- clocks: phandle to the IC source clock.
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- clock-names: Should be "xtal" if clock is an external crystal or
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"osc" if an external clock source is used.
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Optional properties:
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- gpio-controller: Marks the device node as a GPIO controller.
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- #gpio-cells: Should be two. The first cell is the GPIO number and
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the second cell is used to specify the GPIO polarity:
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0 = active high,
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1 = active low.
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Example:
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/ {
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clocks {
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spi_uart_clk: osc_max14830 {
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compatible = "fixed-clock";
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#clock-cells = <0>;
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clock-frequency = <3686400>;
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};
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};
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};
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&spi0 {
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max14830: max14830@0 {
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compatible = "maxim,max14830";
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reg = <0>;
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clocks = <&spi_uart_clk>;
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clock-names = "osc";
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interrupt-parent = <&gpio3>;
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interrupts = <7 IRQ_TYPE_LEVEL_LOW>;
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gpio-controller;
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#gpio-cells = <2>;
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};
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};
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