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spi: bcm2835aux: spi: add bindings for the bcm2835 auxiliary spi devices

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This defines the spi1 and spi2 devices in the device-tree.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Martin Sperl 2015-09-11 11:22:03 +00:00 committed by Mark Brown
parent 6ff33f3902
commit 541cf5de02
1 changed files with 38 additions and 0 deletions
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38
Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt Normal file
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Broadcom BCM2835 auxiliar SPI1/2 controller
The BCM2835 contains two forms of SPI master controller, one known simply as
SPI0, and the other known as the "Universal SPI Master"; part of the
auxiliary block. This binding applies to the SPI1/2 controller.
Required properties:
- compatible: Should be "brcm,bcm2835-aux-spi".
- reg: Should contain register location and length for the spi block
- interrupts: Should contain shared interrupt of the aux block
- clocks: The clock feeding the SPI controller - needs to
point to the auxiliar clock driver of the bcm2835,
as this clock will enable the output gate for the specific
clock.
- cs-gpios: the cs-gpios (native cs is NOT supported)
see also spi-bus.txt
Example:
spi1@7e215080 {
compatible = "brcm,bcm2835-aux-spi";
reg = <0x7e215080 0x40>;
interrupts = <1 29>;
clocks = <&aux_clocks BCM2835_AUX_CLOCK_SPI1>;
#address-cells = <1>;
#size-cells = <0>;
cs-gpios = <&gpio 18>, <&gpio 17>, <&gpio 16>;
};
spi2@7e2150c0 {
compatible = "brcm,bcm2835-aux-spi";
reg = <0x7e2150c0 0x40>;
interrupts = <1 29>;
clocks = <&aux_clocks BCM2835_AUX_CLOCK_SPI2>;
#address-cells = <1>;
#size-cells = <0>;
cs-gpios = <&gpio 43>, <&gpio 44>, <&gpio 45>;
};