serial: sh-sci: Add device tree bindings documentation
Document the device tree bindings for the sci serial port devices. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: Simon Horman <horms+renesas@verge.net.au> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
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* Renesas SH-Mobile Serial Communication Interface
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Required properties:
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- compatible: Must contain one of the following:
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- "renesas,scif-r8a7790" for R8A7790 (R-Car H2) SCIF compatible UART.
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- "renesas,scifa-r8a7790" for R8A7790 (R-Car H2) SCIFA compatible UART.
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- "renesas,scifb-r8a7790" for R8A7790 (R-Car H2) SCIFB compatible UART.
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- "renesas,hscif-r8a7790" for R8A7790 (R-Car H2) HSCIF compatible UART.
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- "renesas,scif-r8a7791" for R8A7791 (R-Car M2) SCIF compatible UART.
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- "renesas,scifa-r8a7791" for R8A7791 (R-Car M2) SCIFA compatible UART.
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- "renesas,scifb-r8a7791" for R8A7791 (R-Car M2) SCIFB compatible UART.
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- "renesas,hscif-r8a7791" for R8A7791 (R-Car M2) HSCIF compatible UART.
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- "renesas,scif" for generic SCIF compatible UART.
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- "renesas,scifa" for generic SCIFA compatible UART.
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- "renesas,scifb" for generic SCIFB compatible UART.
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- "renesas,hscif" for generic HSCIF compatible UART.
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When compatible with the generic version, nodes must list the
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SoC-specific version corresponding to the platform first followed by the
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generic version.
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- reg: Base address and length of the I/O registers used by the UART.
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- interrupts: Must contain an interrupt-specifier for the SCIx interrupt.
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- clocks: Must contain a phandle and clock-specifier pair for each entry
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in clock-names.
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- clock-names: Must contain "sci_ick" for the SCIx UART interface clock.
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Note: Each enabled SCIx UART should have an alias correctly numbered in the
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"aliases" node.
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Example:
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aliases {
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serial0 = &scifa0;
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};
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scifa0: serial@e6c40000 {
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compatible = "renesas,scifa-r8a7790", "renesas,scifa-generic";
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reg = <0 0xe6c40000 0 64>;
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interrupt-parent = <&gic>;
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interrupts = <0 144 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&mstp2_clks R8A7790_CLK_SCIFA0>;
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clock-names = "sci_ick";
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};
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