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authorWenyou Yang <wenyou.yang@atmel.com>2016-07-20 17:16:28 +0800
committerAndreas Bießmann <andreas@biessmann.org>2016-08-15 22:58:04 +0200
commit256a3f2466be1e4212abff92df285fcb6cdff5eb (patch)
tree8b4bfb44a035b305a58dbc6da16beff71fd50e9e /doc
parentac72e174f95ebce2e4a4e2165828223427b2a5f3 (diff)
atmel: Bring in at91 pio4 device tree file and bindings
Bring in required device tree file and bindings from Linux. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Reviewed-by: Andreas Bießmann <andreas@biessmann.org> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc')
-rw-r--r--doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt66
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diff --git a/doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt b/doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt
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+* Atmel PIO4 Controller
+
+The Atmel PIO4 controller is used to select the function of a pin and to
+configure it.
+
+Required properties:
+- compatible: "atmel,sama5d2-pinctrl".
+- reg: base address and length of the PIO controller.
+
+Please refer to pinctrl-bindings.txt in this directory for details of the
+common pinctrl bindings used by client devices.
+
+Subnode format
+Each node (or subnode) will list the pins it needs and how to configured these
+pins.
+
+ node {
+ pinmux = <PIN_NUMBER_PINMUX>;
+ GENERIC_PINCONFIG;
+ };
+
+Required properties:
+- pinmux: integer array. Each integer represents a pin number plus mux and
+ioset settings. Use the macros from boot/dts/<soc>-pinfunc.h file to get the
+right representation of the pin.
+
+Optional properties:
+- GENERIC_PINCONFIG: generic pinconfig options to use, bias-disable,
+bias-pull-down, bias-pull-up, drive-open-drain, input-schmitt-enable,
+input-debounce.
+
+Example:
+
+#include <sama5d2-pinfunc.h>
+
+...
+{
+ spi0: spi@f8000000 {
+ cs-gpios = <&pioA 17 0>, <0>, <0>, <0>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_spi0_default>;
+ status = "okay";
+
+ spi_flash@0 {
+ compatible = "spi-flash";
+ reg = <0>;
+ spi-max-frequency = <50000000>;
+ };
+ };
+
+ ...
+
+ pioA: pinctrl@fc038000 {
+ compatible = "atmel,sama5d2-pinctrl";
+ reg = <0xfc038000 0x600>;
+
+ pinctrl_spi0_default: spi0_default {
+ pinmux = <PIN_PA14__SPI0_SPCK>,
+ <PIN_PA15__SPI0_MOSI>,
+ <PIN_PA16__SPI0_MISO>;
+ bias-disable;
+ };
+ ...
+ };
+};
+...