forked from Minki/linux
4a5705a9c2
Reduced Serial Bus is a proprietary 2-line push-pull serial bus supporting multiple slave devices. It was developed by Allwinner, Inc. and used by Allwinner and X-Powers, Inc. for their line of PMICs and other peripheral ICs. Recent Allwinner SoCs, starting with the A23, have an RSB controller. This is used to talk to the PMIC, and later with the A80 and A83 platform, the audio codec IC. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Olof Johansson <olof@lixom.net>
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
Allwinner Reduced Serial Bus (RSB) controller
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The RSB controller found on later Allwinner SoCs is an SMBus like 2 wire
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serial bus with 1 master and up to 15 slaves. It is represented by a node
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for the controller itself, and child nodes representing the slave devices.
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Required properties :
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- reg : Offset and length of the register set for the controller.
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- compatible : Shall be "allwinner,sun8i-a23-rsb".
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- interrupts : The interrupt line associated to the RSB controller.
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- clocks : The gate clk associated to the RSB controller.
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- resets : The reset line associated to the RSB controller.
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- #address-cells : shall be 1
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- #size-cells : shall be 0
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Optional properties :
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- clock-frequency : Desired RSB bus clock frequency in Hz. Maximum is 20MHz.
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If not set this defaults to 3MHz.
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Child nodes:
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An RSB controller node can contain zero or more child nodes representing
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slave devices on the bus. Child 'reg' properties should contain the slave
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device's hardware address. The hardware address is hardwired in the device,
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which can normally be found in the datasheet.
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Example:
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rsb@01f03400 {
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compatible = "allwinner,sun8i-a23-rsb";
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reg = <0x01f03400 0x400>;
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interrupts = <0 39 4>;
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clocks = <&apb0_gates 3>;
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clock-frequency = <3000000>;
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resets = <&apb0_rst 3>;
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#address-cells = <1>;
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#size-cells = <0>;
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pmic@3e3 {
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compatible = "...";
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reg = <0x3e3>;
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/* ... */
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};
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};
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