[PATCH v4 2/5] dt-bindings: Add pinctrl bindings for mt65xx/mt81xx.
Matthias Brugger
matthias.bgg at gmail.com
Tue Jan 20 07:46:54 PST 2015
2014-12-17 0:34 GMT+01:00 Hongzhou Yang <hongzhou.yang at mediatek.com>:
> From: Hongzhou Yang <hongzhou.yang at mediatek.com>
>
> Add devicetree bindings for Mediatek SoC pinctrl driver.
>
> Signed-off-by: Hongzhou Yang <hongzhou.yang at mediatek.com>
> ---
> .../devicetree/bindings/pinctrl/pinctrl-mt65xx.txt | 142 +++++++++++++++++++++
> 1 file changed, 142 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl-mt65xx.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt65xx.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt65xx.txt
> new file mode 100644
> index 0000000..3bf34f9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt65xx.txt
> @@ -0,0 +1,142 @@
> +* Mediatek MT65XX Pin Controller
> +
> +The Mediatek's Pin controller is used to control SoC pins.
> +
> +Required properties:
> +- compatible: value should be either of the following.
> + (a) "mediatek,mt8135-pinctrl", compatible with mt8135 pinctrl.
> +- mediatek,pctl-regmap: Should be a phandle of the syscfg node.
> +- gpio-controller : Marks the device node as a gpio controller.
> +- #gpio-cells: number of cells in GPIO specifier. Since the generic GPIO
> + binding is used, the amount of cells must be specified as 2. See the below
> + mentioned gpio binding representation for description of particular cells.
> +
> + Eg: <&pio 6 0>
> + <[phandle of the gpio controller node]
> + [pin number within the gpio controller]
> + [flags]>
> +
> + Values for gpio specifier:
> + - Pin number: is a value between 0 to 202.
> + - Flags: bit field of flags, as defined in <dt-bindings/gpio/gpio.h>.
> + Only the following flags are supported:
> + 0 - GPIO_ACTIVE_HIGH
> + 1 - GPIO_ACTIVE_LOW
> +- reg: physicall address base for EINT registers
> +- interrupt-controller: Marks the device node as an interrupt controller
> +- #interrupt-cells: Should be two.
> +- interrupts : The interrupt outputs from the controller.
> +
> +Please refer to pinctrl-bindings.txt in this directory for details of the
> +common pinctrl bindings used by client devices.
> +
> +A pinctrl node should contain at least one subnodes representing the
> +pinctrl groups available on the machine. Each subnode will list the
> +pins it needs, and how they should be configured, with regard to muxer
> +configuration, pullups, drive strngth, input enable/disable and input schmitt.
drive strength
> +
> +Required subnode-properties:
> +
> +- pins: 2 integers array, represents gpio pinmux number and config
> + setting. The format as following
> +
> + node {
> + pins = <PIN_NUMBER_PINMUX>;
> + GENERIC_PINCONFIG;
> + };
> +
> + The PIN_NUMBER_PINMUX is combination of GPIO number and pinmux, it can
> + use macros which already defind in boot/dts/mt8135-pinfunc.h directly.
> + The GENERIC_PINCONFIG is the generic pinconfig options to use, bias-disable,
> + bias-pull-down, bias-pull-up, input-enable, input-disable, output-low, output-high,
> + input-schmitt-enable, input-schmitt-disable and drive-strength are valid.
> +
> + Some special pins have extra pull up strength, there are R0 and R1 pull-up
> + resistors available, but for user, it's only need to set R1R0 as 00, 01, 10 or 11.
> + So when config bias-pull-up, it support arguments for those special pins.
> + Some macros have been defined for this usage, such as MTK_PUPD_SET_R1R0_00.
> + See dt-bindings/pinctrl/mt65xx.h.
> +
> + When config drive-strength, it can support some arguments, such as
> + MTK_DRIVE_4mA, MTK_DRIVE_6mA, etc. See dt-bindings/pinctrl/mt65xx.h.
> +
> +Examples:
> +
> +#include "mt8135-pinfunc.h"
> +
> +...
> +{
> + syscfg_pctl_a: syscfg_pctl_a at 10005000 {
> + compatible = "mediatek,mt8135-pctl-a-syscfg", "syscon";
> + reg = <0 0x10005000 0 0x1000>;
> + };
> +
> + syscfg_pctl_b: syscfg_pctl_b at 1020C020 {
> + compatible = "mediatek,mt8135-pctl-b-syscfg", "syscon";
> + reg = <0 0x1020C020 0 0x1000>;
> + };
> +
> + pinctrl at 01c20800 {
> + compatible = "mediatek,mt8135-pinctrl";
> + reg = <0 0x1000B000 0 0x1000>;
> + mediatek,pctl-regmap = <&syscfg_pctl_a &syscfg_pctl_b>;
> + gpio-controller;
> + #gpio-cells = <2>;
> + interrupt-controller;
> + #interrupt-cells = <2>;
> + interrupts = <GIC_SPI 116 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 118 IRQ_TYPE_LEVEL_HIGH>;
> +
> + i2c0_pins_a: i2c0 at 0 {
> + pins1 {
> + pins = <MT8135_PIN_100_SDA0__FUNC_SDA0>,
> + <MT8135_PIN_101_SCL0__FUNC_SCL0>;
> + bias-disable;
> + };
> + };
> +
> + i2c1_pins_a: i2c1 at 0 {
> + pins {
> + pins = <MT8135_PIN_195_SDA1__FUNC_SDA1>,
> + <MT8135_PIN_196_SCL1__FUNC_SCL1>;
> + bias-pull-up = <55>;
> + };
> + };
> +
> + i2c2_pins_a: i2c2 at 0 {
> + pins1 {
> + pins = <MT8135_PIN_193_SDA2__FUNC_SDA2>;
> + bias-pull-down;
> + };
> +
> + pins2 {
> + pins = <MT8135_PIN_49_WATCHDOG__FUNC_GPIO49>;
> + bias-pull-up;
> + };
> + };
> +
> + i2c3_pins_a: i2c3 at 0 {
> + pins1 {
> + pins = <MT8135_PIN_40_DAC_CLK__FUNC_GPIO40>,
> + <MT8135_PIN_41_DAC_WS__FUNC_GPIO41>;
> + bias-pull-up = <55>;
> + };
> +
> + pins2 {
> + pins = <MT8135_PIN_35_SCL3__FUNC_SCL3>,
> + <MT8135_PIN_36_SDA3__FUNC_SDA3>;
> + output-low;
> + bias-pull-up = <55>;
> + };
> +
> + pins3 {
> + pins = <MT8135_PIN_57_JTCK__FUNC_GPIO57>,
> + <MT8135_PIN_60_JTDI__FUNC_JTDI>;
> + drive-strength = <32>;
> + };
> + };
> +
> + ...
> + }
> +};
> --
> 1.8.1.1.dirty
>
--
motzblog.wordpress.com
More information about the linux-arm-kernel
mailing list