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79bb646001
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>
46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
ImgTec TZ1090 PDC GPIO Controller
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Required properties:
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- compatible: Compatible property value should be "img,tz1090-pdc-gpio".
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- reg: Physical base address of the controller and length of memory mapped
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region. This starts at and cover the SOC_GPIO_CONTROL registers.
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- gpio-controller: Specifies that the node is a gpio controller.
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- #gpio-cells: Should be 2. The syntax of the gpio specifier used by client
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nodes should have the following values.
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<[phandle of the gpio controller node]
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[PDC gpio number]
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[gpio flags]>
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Values for gpio specifier:
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- GPIO number: a value in the range 0 to 6.
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- GPIO flags: bit field of flags, as defined in <dt-bindings/gpio/gpio.h>.
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Only the following flags are supported:
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GPIO_ACTIVE_HIGH
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GPIO_ACTIVE_LOW
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Optional properties:
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- gpio-ranges: Mapping to pin controller pins (as described in
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Documentation/devicetree/bindings/gpio/gpio.txt)
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- interrupts: Individual syswake interrupts (other GPIOs cannot interrupt)
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Example:
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pdc_gpios: gpio-controller@02006500 {
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gpio-controller;
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#gpio-cells = <2>;
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compatible = "img,tz1090-pdc-gpio";
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reg = <0x02006500 0x100>;
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interrupt-parent = <&pdc>;
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interrupts = <8 IRQ_TYPE_NONE>, /* Syswake 0 */
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<9 IRQ_TYPE_NONE>, /* Syswake 1 */
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<10 IRQ_TYPE_NONE>; /* Syswake 2 */
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gpio-ranges = <&pdc_pinctrl 0 0 7>;
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};
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