The commit adds mt8192 compatible node in binding document. Signed-off-by: Zhiyong Tao <zhiyong.tao@xxxxxxxxxxxx> --- .../bindings/pinctrl/pinctrl-mt8192.yaml | 170 ++++++++++++++++++ 1 file changed, 170 insertions(+) create mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml new file mode 100644 index 000000000000..c698b7f65950 --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml @@ -0,0 +1,170 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pinctrl/pinctrl-mt8192.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Mediatek MT8192 Pin Controller + +maintainers: + - Linus Walleij <linus.walleij@xxxxxxxxxx> + +description: | + The Mediatek's Pin controller is used to control SoC pins. + +properties: + compatible: + const: mediatek,mt8192-pinctrl + + gpio-controller: true + + '#gpio-cells': + description: + 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. + const: 2 + + gpio-ranges: + description: gpio valid number range. + maxItems: 1 + + reg: + description: + Physical address base for gpio base registers. There are 11 GPIO + physical address base in mt8192. + maxItems: 11 + + reg-names: + description: + Gpio base register names. There are 11 gpio base register names in mt8192. + They are "iocfg0", "iocfg_rm", "iocfg_bm", "iocfg_bl", "iocfg_br", + "iocfg_lm", "iocfg_lb", "iocfg_rt", "iocfg_lt", "iocfg_tl", "eint". + maxItems: 11 + + interrupt-controller: true + + '#interrupt-cells': + const: 2 + + interrupts: + description: The interrupt outputs to sysirq. + maxItems: 1 + +#PIN CONFIGURATION NODES +patternProperties: + subnode format: + description: + 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 strength, input enable/disable and + input schmitt. + + node { + pinmux = <PIN_NUMBER_PINMUX>; + GENERIC_PINCONFIG; + }; + '-pinmux$': + description: + Integer array, represents gpio pin number and mux setting. + Supported pin number and mux varies for different SoCs, and are defined + as macros in dt-bindings/pinctrl/<soc>-pinfunc.h directly. + $ref: "/schemas/pinctrl/pincfg-node.yaml" + + GENERIC_PINCONFIG: + description: + It 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 It needs config "mediatek,pull-up-adv" or + "mediatek,pull-down-adv" to support arguments for those special pins. + Valid arguments are from 0 to 3. + + We can use "mediatek,tdsel" which is an integer describing the steps for + output level shifter duty cycle when asserted (high pulse width adjustment). + Valid arguments are from 0 to 15. + We can use "mediatek,rdsel" which is an integer describing the steps for + input level shifter duty cycle when asserted (high pulse width adjustment). + Valid arguments are from 0 to 63. + + When config drive-strength, it can support some arguments, such as + MTK_DRIVE_4mA, MTK_DRIVE_6mA, etc. See dt-bindings/pinctrl/mt65xx.h. + It can only support 2/4/6/8/10/12/14/16mA in mt8192. + For I2C pins, there are existing generic driving setup and the specific + driving setup. I2C pins can only support 2/4/6/8/10/12/14/16mA driving + adjustment in generic driving setup. But in specific driving setup, + they can support 0.125/0.25/0.5/1mA adjustment. If we enable specific + driving setup for I2C pins, the existing generic driving setup will be + disabled. For some special features, we need the I2C pins specific + driving setup. The specific driving setup is controlled by E1E0EN. + So we need add extra vendor driving preperty instead of + the generic driving property. + We can add "mediatek,drive-strength-adv = <XXX>;" to describe the specific + driving setup property. "XXX" means the value of E1E0EN. EN is 0 or 1. + It is used to enable or disable the specific driving setup. + E1E0 is used to describe the detail strength specification of the I2C pin. + When E1=0/E0=0, the strength is 0.125mA. + When E1=0/E0=1, the strength is 0.25mA. + When E1=1/E0=0, the strength is 0.5mA. + When E1=1/E0=1, the strength is 1mA. + So the valid arguments of "mediatek,drive-strength-adv" are from 0 to 7. + +required: + - compatible + - reg + - interrupts + - interrupt-controller + - '#interrupt-cells' + - gpio-controller + - '#gpio-cells' + - gpio-ranges + +examples: + - | + #include <dt-bindings/pinctrl/mt8192-pinfunc.h> + #include <dt-bindings/interrupt-controller/arm-gic.h> + pio: pinctrl@10005000 { + compatible = "mediatek,mt8192-pinctrl"; + reg = <0 0x10005000 0 0x1000>, + <0 0x11c20000 0 0x1000>, + <0 0x11d10000 0 0x1000>, + <0 0x11d30000 0 0x1000>, + <0 0x11d40000 0 0x1000>, + <0 0x11e20000 0 0x1000>, + <0 0x11e70000 0 0x1000>, + <0 0x11ea0000 0 0x1000>, + <0 0x11f20000 0 0x1000>, + <0 0x11f30000 0 0x1000>, + <0 0x1000b000 0 0x1000>; + reg-names = "iocfg0", "iocfg_rm", "iocfg_bm", + "iocfg_bl", "iocfg_br", "iocfg_lm", + "iocfg_lb", "iocfg_rt", "iocfg_lt", + "iocfg_tl", "eint"; + gpio-controller; + #gpio-cells = <2>; + gpio-ranges = <&pio 0 0 220>; + interrupt-controller; + interrupts = <GIC_SPI 212 IRQ_TYPE_LEVEL_HIGH 0>; + #interrupt-cells = <2>; + i2c0_pins_a: i2c0 { + pins { + pinmux = <PINMUX_GPIO118__FUNC_SCL1>, + <PINMUX_GPIO119__FUNC_SDA1>; + mediatek,pull-up-adv = <3>; + mediatek,drive-strength-adv = <7>; + }; + }; + i2c1_pins_a: i2c1 { + pins { + pinmux = <PINMUX_GPIO141__FUNC_SCL2>, + <PINMUX_GPIO142__FUNC_SDA2>; + mediatek,pull-down-adv = <2>; + mediatek,drive-strength-adv = <4>; + }; + }; + }; -- 2.18.0
