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authorJames Hogan <james.hogan@imgtec.com>2013-06-25 15:27:44 +0100
committerLinus Walleij <linus.walleij@linaro.org>2013-07-20 19:03:48 +0200
commit79bb6460012c7c9f40aeb7b7d5f28aaac4455912 (patch)
tree02c24499be95b62b2906a8de698423b73ec33392 /Documentation/devicetree/bindings
parent9caf1f2202da2affedf0c9e3c1ccda8ea6d353e1 (diff)
gpio-tz1090-pdc: add TZ1090 PDC gpio driver
Add a GPIO driver for the low-power Powerdown Controller GPIOs in the TZ1090 SoC. The driver is instantiated by device tree and supports interrupts for the SysWake GPIOs only. Changes in v4: - fix typos in DT bindings compatible properties - reference Documentation/devicetree/bindings/gpio/gpio.txt in gpio-ranges description in DT bindings - fix gpio-ranges examples in DT bindings (it must now have 3 cells) Changes in v3: - separated from irq-imgpdc and removed arch/metag changes to allow these patches to go upstream separately via the pinctrl[/gpio] trees (particularly the pinctrl drivers depend on the new pinconf DT bindings). - some s/unsigned/unsigned int/. - gpio-tz1090*: refer to <dt-bindings/gpio/gpio.h> and <dt-bindings/interrupt-controller/irq.h> flags in bindings. - gpio-tz1090*: move initcall from postcore to subsys. Changes in v2: - gpio-tz1090-pdc: remove references to Linux flags in dt bindings - gpio-tz1090-pdc: make use of BIT() from linux/bitops.h - gpio-tz1090-pdc: make register accessors inline to match pinctrl - gpio-tz1090-pdc: update gpio-ranges to use 3 cells after recent ABI breakage Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Rob Landley <rob@landley.net> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: linux-doc@vger.kernel.org Cc: devicetree-discuss@lists.ozlabs.org Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings')
-rw-r--r--Documentation/devicetree/bindings/gpio/gpio-tz1090-pdc.txt45
1 files changed, 45 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-tz1090-pdc.txt b/Documentation/devicetree/bindings/gpio/gpio-tz1090-pdc.txt
new file mode 100644
index 000000000000..1fd98ffa8cb7
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-tz1090-pdc.txt
@@ -0,0 +1,45 @@
+ImgTec TZ1090 PDC GPIO Controller
+
+Required properties:
+- compatible: Compatible property value should be "img,tz1090-pdc-gpio".
+
+- reg: Physical base address of the controller and length of memory mapped
+ region. This starts at and cover the SOC_GPIO_CONTROL registers.
+
+- gpio-controller: Specifies that the node is a gpio controller.
+
+- #gpio-cells: Should be 2. The syntax of the gpio specifier used by client
+ nodes should have the following values.
+ <[phandle of the gpio controller node]
+ [PDC gpio number]
+ [gpio flags]>
+
+ Values for gpio specifier:
+ - GPIO number: a value in the range 0 to 6.
+ - GPIO flags: bit field of flags, as defined in <dt-bindings/gpio/gpio.h>.
+ Only the following flags are supported:
+ GPIO_ACTIVE_HIGH
+ GPIO_ACTIVE_LOW
+
+Optional properties:
+- gpio-ranges: Mapping to pin controller pins (as described in
+ Documentation/devicetree/bindings/gpio/gpio.txt)
+
+- interrupts: Individual syswake interrupts (other GPIOs cannot interrupt)
+
+
+Example:
+
+ pdc_gpios: gpio-controller@02006500 {
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ compatible = "img,tz1090-pdc-gpio";
+ reg = <0x02006500 0x100>;
+
+ interrupt-parent = <&pdc>;
+ interrupts = <8 IRQ_TYPE_NONE>, /* Syswake 0 */
+ <9 IRQ_TYPE_NONE>, /* Syswake 1 */
+ <10 IRQ_TYPE_NONE>; /* Syswake 2 */
+ gpio-ranges = <&pdc_pinctrl 0 0 7>;
+ };

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