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The PWM pins on North Bridge on Armada 37xx can be configured into PWM
or GPIO functions. When in PWM function, each pin can also be configured
to drive low on 0 and tri-state on 1 (LED mode).
The current definitions handle this by declaring two pin groups for each
pin:
- group "pwmN" with functions "pwm" and "gpio"
- group "ledN_od" ("od" for open drain) with functions "led" and "gpio"
This is semantically incorrect. The correct definition for each pin
should be one group with three functions: "pwm", "led" and "gpio".
Change the "pwmN" groups to support "led" function.
Remove "ledN_od" groups. This cannot break backwards compatibility with
older device trees: no device tree uses it since there is no PWM driver
for this SOC yet. Also "ledN_od" groups are not even documented.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
186 lines
No EOL
3.5 KiB
Text
186 lines
No EOL
3.5 KiB
Text
* Marvell Armada 37xx SoC pin and GPIO controller
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Each Armada 37xx SoC comes with two pin and GPIO controllers, one for the
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South Bridge and the other for the North Bridge.
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GPIO and pin controller:
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------------------------
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Main node:
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Refer to pinctrl-bindings.txt in this directory for details of the
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common pinctrl bindings used by client devices, including the meaning
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of the phrase "pin configuration node".
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Required properties for pinctrl driver:
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- compatible: "marvell,armada3710-sb-pinctrl", "syscon, "simple-mfd"
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for the South Bridge
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"marvell,armada3710-nb-pinctrl", "syscon, "simple-mfd"
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for the North Bridge
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- reg: The first set of registers is for pinctrl/GPIO and the second
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set is for the interrupt controller
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- interrupts: list of interrupts used by the GPIO
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Available groups and functions for the North Bridge:
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group: jtag
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- pins 20-24
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- functions jtag, gpio
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group sdio0
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- pins 8-10
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- functions sdio, gpio
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group emmc_nb
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- pins 27-35
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- functions emmc, gpio
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group pwm0
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- pin 11 (GPIO1-11)
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- functions pwm, led, gpio
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group pwm1
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- pin 12
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- functions pwm, led, gpio
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group pwm2
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- pin 13
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- functions pwm, led, gpio
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group pwm3
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- pin 14
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- functions pwm, led, gpio
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group pmic1
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- pin 7
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- functions pmic, gpio
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group pmic0
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- pin 6
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- functions pmic, gpio
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group i2c2
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- pins 2-3
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- functions i2c, gpio
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group i2c1
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- pins 0-1
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- functions i2c, gpio
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group spi_cs1
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- pin 17
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- functions spi, gpio
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group spi_cs2
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- pin 18
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- functions spi, gpio
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group spi_cs3
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- pin 19
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- functions spi, gpio
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group onewire
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- pin 4
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- functions onewire, gpio
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group uart1
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- pins 25-26
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- functions uart, gpio
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group spi_quad
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- pins 15-16
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- functions spi, gpio
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group uart_2
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- pins 9-10
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- functions uart, gpio
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Available groups and functions for the South Bridge:
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group usb32_drvvbus0
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- pin 36
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- functions drvbus, gpio
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group usb2_drvvbus1
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- pin 37
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- functions drvbus, gpio
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group sdio_sb
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- pins 60-65
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- functions sdio, gpio
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group rgmii
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- pins 42-53
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- functions mii, gpio
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group pcie1
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- pins 39-41
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- functions pcie, gpio
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group smi
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- pins 54-55
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- functions smi, gpio
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group ptp
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- pins 56-58
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- functions ptp, gpio
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group ptp_clk
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- pin 57
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- functions ptp, mii
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group ptp_trig
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- pin 58
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- functions ptp, mii
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group mii_col
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- pin 59
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- functions mii, mii_err
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GPIO subnode:
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Please refer to gpio.txt in "gpio" directory for details of gpio-ranges property
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and the common GPIO bindings used by client devices.
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Required properties for the GPIO driver under the gpio subnode:
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- interrupts: List of interrupt specifiers for the controllers interrupt.
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- gpio-controller: Marks the device node as a GPIO controller.
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- #gpio-cells: Should be 2. The first cell is the GPIO number and the
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second cell specifies GPIO flags, as defined in
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<dt-bindings/gpio/gpio.h>. Only the GPIO_ACTIVE_HIGH and
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GPIO_ACTIVE_LOW flags are supported.
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- gpio-ranges: Range of pins managed by the GPIO controller.
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Example:
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pinctrl_sb: pinctrl-sb@18800 {
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compatible = "marvell,armada3710-sb-pinctrl",
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"syscon", "simple-mfd";
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reg = <0x18800 0x100>, <0x18C00 0x20>;
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gpiosb: gpiosb {
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#gpio-cells = <2>;
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gpio-ranges = <&pinctrl_sb 0 0 30>;
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gpio-controller;
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interrupts =
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<GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 159 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 158 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 157 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 156 IRQ_TYPE_LEVEL_HIGH>;
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};
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rgmii_pins: mii-pins {
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groups = "rgmii";
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function = "mii";
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};
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sdio_pins: sdio-pins {
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groups = "sdio_sb";
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function = "sdio";
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};
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pcie_pins: pcie-pins {
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groups = "pcie1";
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function = "pcie";
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};
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}; |