62 lines
1.7 KiB
Plaintext
62 lines
1.7 KiB
Plaintext
|
* Freescale i.MX7ULP IOMUX Controller
|
||
|
|
|
||
|
|
i.MX 7ULP has three IOMUXC instances: IOMUXC0 for M4 ports, IOMUXC1 for A7
|
||
|
|
ports and IOMUXC DDR for DDR interface.
|
||
|
|
|
||
|
|
Note:
|
||
|
|
This binding doc is only for the IOMUXC1 support in A7 Domain and it only
|
||
|
|
supports generic pin config.
|
||
|
|
|
||
|
|
Please also refer pinctrl-bindings.txt in this directory for generic pinctrl
|
||
|
|
binding.
|
||
|
|
|
||
|
|
=== Pin Controller Node ===
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
- compatible: "fsl,imx7ulp-iomuxc1"
|
||
|
|
- reg: Should contain the base physical address and size of the iomuxc
|
||
|
|
registers.
|
||
|
|
|
||
|
|
=== Pin Configuration Node ===
|
||
|
|
- pinmux: One integers array, represents a group of pins mux setting.
|
||
|
|
The format is pinmux = <PIN_FUNC_ID>, PIN_FUNC_ID is a pin working on
|
||
|
|
a specific function.
|
||
|
|
|
||
|
|
NOTE: i.MX7ULP PIN_FUNC_ID consists of 4 integers as it shares one mux
|
||
|
|
and config register as follows:
|
||
|
|
<mux_conf_reg input_reg mux_mode input_val>
|
||
|
|
|
||
|
|
Refer to imx7ulp-pinfunc.h in in device tree source folder for all
|
||
|
|
available imx7ulp PIN_FUNC_ID.
|
||
|
|
|
||
|
|
Optional Properties:
|
||
|
|
- drive-strength Integer. Controls Drive Strength
|
||
|
|
0: Standard
|
||
|
|
1: Hi Driver
|
||
|
|
- drive-push-pull Bool. Enable Pin Push-pull
|
||
|
|
- drive-open-drain Bool. Enable Pin Open-drian
|
||
|
|
- slew-rate: Integer. Controls Slew Rate
|
||
|
|
0: Standard
|
||
|
|
1: Slow
|
||
|
|
- bias-disable: Bool. Pull disabled
|
||
|
|
- bias-pull-down: Bool. Pull down on pin
|
||
|
|
- bias-pull-up: Bool. Pull up on pin
|
||
|
|
|
||
|
|
Examples:
|
||
|
|
#include "imx7ulp-pinfunc.h"
|
||
|
|
|
||
|
|
/* Pin Controller Node */
|
||
|
|
iomuxc1: iomuxc@40ac0000 {
|
||
|
|
compatible = "fsl,imx7ulp-iomuxc1";
|
||
|
|
reg = <0x40ac0000 0x1000>;
|
||
|
|
|
||
|
|
/* Pin Configuration Node */
|
||
|
|
pinctrl_lpuart4: lpuart4grp {
|
||
|
|
pinmux = <
|
||
|
|
IMX7ULP_PAD_PTC3__LPUART4_RX
|
||
|
|
IMX7ULP_PAD_PTC2__LPUART4_TX
|
||
|
|
>;
|
||
|
|
bias-pull-up;
|
||
|
|
};
|
||
|
|
};
|