On Mon, 2020-08-03 at 15:46 -0600, Rob Herring wrote: > On Sat, Aug 01, 2020 at 12:33:02PM +0800, Zhiyong Tao wrote: > > The commit adds mt8192 compatible node in binding document. > > > > Signed-off-by: Zhiyong Tao <zhiyong.tao@xxxxxxxxxxxx> > > --- > > .../bindings/pinctrl/pinctrl-mt8192.yaml | 175 ++++++++++++++++++ > > 1 file changed, 175 insertions(+) > > create mode 100755 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 100755 > > index 000000000000..88e18e2e23a0 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml > > @@ -0,0 +1,175 @@ > > +# 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: > > + - Sean Wang <sean.wang@xxxxxxxxxxxx> > > + > > +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. > > + maxItems: 11 > > + > > + interrupt-controller: true > > + > > + '#interrupt-cells': > > + const: 2 > > + > > + interrupts: > > + description: The interrupt outputs to sysirq. > > + maxItems: 1 > > + > > +#PIN CONFIGURATION NODES > > +patternProperties: > > + '^pins': > > + type: object > > + 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. > > + An example of using macro: > > + node { > > 'node' doesn't match '^pins' regex. > > Better to put an example in the actual example so it is checked. ==> Dear Rob, we will change it as the actual example in v3: pincontroller { /* GPIO0 set as multifunction GPIO0*/ state_0_node_a { pinmux = <PINMUX_GPIO0__FUNC_GPIO0>; }; /* GPIO0 set as multifunction PWM*/ state_0_node_b { pinmux = <PINMUX_GPIO1__FUNC_PWM_1>; }; }; Is it ok? > > + pinmux = <PIN_NUMBER_PINMUX>; > > + GENERIC_PINCONFIG; > > + }; > > + properties: > > + pinmux: > > + $ref: "/schemas/types.yaml#/definitions/uint32-array" > > Already a common definition in pinmux-node.yaml. Reference that file in > '^pins' > . ==> we will change the ref as "$ref: "pinmux-node.yaml"" in v3. > > + 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. > > + > > + GENERIC_PINCONFIG: > > That's not a property name. ==> we will remove it in v3. and separate out the property name "mediatek,pull-up-adv", "mediatek,pull-down-adv", "mediatek,tdsel", "mediatek,rdsel", "drive-strength", "mediatek,drive-strength-adv = <XXX>;" in v3. > > > + 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. > > + > > + bias-pull-down: true > > + > > + bias-pull-up: true > > + > > + bias-disable: true > > + > > + output-high: true > > + > > + output-low: true > > + > > + input-enable: true > > + > > + input-disable: true > > + > > + input-schmitt-enable: true > > + > > + input-schmitt-disable: true > > + > > + required: > > + - pinmux > > + > > +required: > > + - compatible > > + - reg > > + - interrupts > > + - interrupt-controller > > + - '#interrupt-cells' > > + - gpio-controller > > + - '#gpio-cells' > > + - gpio-ranges > > additionalProperties: false > ==> We will add it in v3. Thanks. > > + > > +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>; > > + }; > > -- > > 2.18.0
