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dt-bindings: gpio: lpc18xx: describe interrupt controllers of GPIO controller

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From LPC18xx and LPC43xx User Manuals the GPIO controller consists of
the following weakly connected blocks:
* GPIO pin interrupt block at 0x40087000,
* GPIO GROUP0 interrupt block at 0x40088000,
* GPIO GROUP1 interrupt block at 0x40089000,
* GPIO port block at 0x400F4000.

While all 4 sub-controller blocks have their own I/O addresses, moreover
all 3 interrupt blocks are APB0 peripherals and high-speed GPIO block is
an AHB slave, according to the hardware manual interrupt controllers and
GPIO controller block are seen as a single device, all 4 sub-controllers
have the shared reset signal RGU #28 and the same shared clock to access
registers CLK_Mx_GPIO on CCU1.

The change adds descriptions of the currently missing interrupt controller
blocks found on GPIO controller, new added properties are 'reg-names',
'resets', 'interrupt-controller' and '#interrupt-cells', also the example
is updated to reflect the changes in device tree binding description.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Vladimir Zapolskiy 2018-11-29 00:48:40 +02:00 committed by Linus Walleij
parent 5ddabfe8d3
commit e96fd5ce5f
1 changed files with 29 additions and 9 deletions
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38
Documentation/devicetree/bindings/gpio/nxp,lpc1850-gpio.txt
View File

@ -3,12 +3,24 @@ NXP LPC18xx/43xx GPIO controller Device Tree Bindings
Required properties:
- compatible : Should be "nxp,lpc1850-gpio"
- reg : Address and length of the register set for the device
- clocks : Clock specifier (see clock bindings for details)
- gpio-controller : Marks the device node as a GPIO controller.
- #gpio-cells : Should be two
- First cell is the GPIO line number
- Second cell is used to specify polarity
- reg : List of addresses and lengths of the GPIO controller
register sets
- reg-names : Should be "gpio", "gpio-pin-ic", "gpio-group0-ic" and
"gpio-gpoup1-ic"
- clocks : Phandle and clock specifier pair for GPIO controller
- resets : Phandle and reset specifier pair for GPIO controller
- gpio-controller : Marks the device node as a GPIO controller
- #gpio-cells : Should be two:
- The first cell is the GPIO line number
- The second cell is used to specify polarity
- interrupt-controller : Marks the device node as an interrupt controller
- #interrupt-cells : Should be two:
- The first cell is an interrupt number within
0..9 range, for GPIO pin interrupts it is equal
to 'nxp,gpio-pin-interrupt' property value of
GPIO pin configuration, 8 is for GPIO GROUP0
interrupt, 9 is for GPIO GROUP1 interrupt
- The second cell is used to specify interrupt type
Optional properties:
- gpio-ranges : Mapping between GPIO and pinctrl
@ -19,21 +31,29 @@ Example:
gpio: gpio@400f4000 {
compatible = "nxp,lpc1850-gpio";
reg = <0x400f4000 0x4000>;
reg = <0x400f4000 0x4000>, <0x40087000 0x1000>,
<0x40088000 0x1000>, <0x40089000 0x1000>;
reg-names = "gpio", "gpio-pin-ic",
"gpio-group0-ic", "gpio-gpoup1-ic";
clocks = <&ccu1 CLK_CPU_GPIO>;
resets = <&rgu 28>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
gpio-ranges = <&pinctrl LPC_GPIO(0,0) LPC_PIN(0,0) 2>,
...
<&pinctrl LPC_GPIO(7,19) LPC_PIN(f,5) 7>;
};
gpio_joystick {
compatible = "gpio-keys-polled";
compatible = "gpio-keys";
...
button@0 {
button0 {
...
interrupt-parent = <&gpio>;
interrupts = <1 IRQ_TYPE_EDGE_BOTH>;
gpios = <&gpio LPC_GPIO(4,8) GPIO_ACTIVE_LOW>;
};
};