From: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
add binding documentation
Signed-off-by: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
---
.../bindings/spi/brcm,bcm2835-aux-spi.txt | 47 ++++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt
Changelog:
v4->v5: fixed wording for reg
removed reference to syscon
removed documentation on typical GPIO config
diff --git a/Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt b/Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt
new file mode 100644
index 0000000..3ade499
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt
@@ -0,0 +1,47 @@
+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.
+- cs-gpios: the cs-gpios (native cs is NOT supported)
+ see also spi-bus.txt
+- bcrm,aux-enable: the bcrm,bcm2835-aux-enable config entry to handle
+ enabling/disabling of the spi1/spi2/uart1 HW block
+ second "argument" is the mask to apply to the
+ enable register
+
+Example:
+
+spi1@7e215080 {
+ compatible = "brcm,bcm2835-aux-spi";
+ reg = <0x7e215080 0x40>;
+ interrupts = <1 29>;
+ clocks = <&clk_spi>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ cs-gpios = <&gpio 18>, <&gpio 17>, <&gpio 16>;
+ bcrm,aux-enable = <&aux_enable 2>;
+};
+
+spi2@7e2150c0 {
+ compatible = "brcm,bcm2835-aux-spi";
+ reg = <0x7e2150c0 0x40>;
+ interrupts = <1 29>;
+ clocks = <&clk_spi>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ cs-gpios = <&gpio 43>, <&gpio 44>, <&gpio 45>;
+ bcrm,aux-enable = <&aux_enable 4>;
+};
+
+/* the necessary bcm2835 aux-enable referenced above */
+aux_enable: aux_enable@0x7e215004 {
+ compatible = "bcrm,bcm2835-aux";
+ reg = <0x7e215004 0x04>;
+};
--
1.7.10.4
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