RE: [PATCH 4/7] dt-bindings: firmware: arm,scmi: support pinctrl protocol
From: Peng Fan
Date: Fri Dec 15 2023 - 23:44:53 EST
Hi Rob,
> Subject: Re: [PATCH 4/7] dt-bindings: firmware: arm,scmi: support pinctrl
> protocol
>
> On Fri, Dec 15, 2023 at 07:56:32PM +0800, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@xxxxxxx>
> >
> > Add SCMI v3.2 pinctrl protocol bindings and example.
> >
> > Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> > ---
> > .../devicetree/bindings/firmware/arm,scmi.yaml | 99
> ++++++++++++++++++++++
> > 1 file changed, 99 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> > b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> > index 4591523b51a0..bfd2b6a89979 100644
> > --- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> > +++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> > @@ -247,6 +247,85 @@ properties:
> > reg:
> > const: 0x18
> >
> > + protocol@19:
> > + type: object
> > + allOf:
> > + - $ref: '#/$defs/protocol-node'
> > + - $ref: /schemas/pinctrl/pinctrl.yaml
> > + - if:
> > + properties:
> > + compatible:
> > + const: fsl,imx95-scmi-pinctrl
> > + then:
> > + patternProperties:
> > + "grp$": false
> > + "-pins$": true
> > + else:
> > + patternProperties:
> > + "grp$": false
> > + "-pins$": true
> > + unevaluatedProperties: false
>
> This will not scale if each vendor adds to arm,scmi.yaml. You need to move
> this to its own file. That can have a ref to
> /schemas/firmware/arm,scmi.yaml#/$defs/protocol-node.
>
> Here you can just say compatible is "fsl,imx95-scmi-pinctrl" and
> 'additionalProperties: true'.
Do you have an example for this? I am not able write a correct
one to pass the dt check.
- if:
properties:
compatible:
const: fsl,imx95-scmi-pinctrl
then:
properties:
additionalProperties: true
.......
compatible: true
And in fsl,imx95-scmi-pinctrl.yaml
allOf:
- $ref: '/schemas/firmware/arm,scmi.yaml#/$defs/protocol-node'
properties:
reg:
const: 0x19
compatible:
const: fsl,imx95-scmi-pinctrl
patternProperties:
'grp$':
type: object
description:
Pinctrl node's client devices use subnodes for desired pin configuration.
Client device subnodes use below standard properties.
properties:
fsl,pins:
description:
.....
>
> > +
> > + properties:
> > + reg:
> > + const: 0x19
> > +
> > + '#pinctrl-cells':
> > + const: 0
>
> Generally not used if 0.
Will drop this property.
>
> > +
> > + compatible:
> > + const: fsl,imx95-scmi-pinctrl
> > +
> > + patternProperties:
> > + '-pins$':
> > + type: object
> > + allOf:
> > + - $ref: /schemas/pinctrl/pincfg-node.yaml#
> > + - $ref: /schemas/pinctrl/pinmux-node.yaml#
> > + unevaluatedProperties: false
> > +
> > + description:
> > + A pin multiplexing sub-node describe how to configure a
> > + set of pins is some desired function.
> > + A single sub-node may define several pin configurations.
> > + This sub-node is using default pinctrl bindings to configure
> > + pin multiplexing and using SCMI protocol to apply specified
> > + configuration using SCMI protocol.
> > +
> > + 'grp$':
> > + type: object
> > + description:
> > + Pinctrl node's client devices use subnodes for desired pin
> configuration.
> > + Client device subnodes use below standard properties.
> > +
> > + properties:
> > + fsl,pins:
> > + description:
> > + each entry consists of 6 integers and represents the mux and
> config
> > + setting for one pin. The first 5 integers <mux_reg conf_reg
> input_reg
> > + mux_val input_val> are specified using a PIN_FUNC_ID macro,
> which can
> > + be found in <arch/arm64/boot/dts/freescale/imx95-pinfunc.h>.
> The last
> > + integer CONFIG is the pad setting value like pull-up on this pin.
> Please
> > + refer to i.MX95 Plus Reference Manual for detailed CONFIG
> settings.
> > + $ref: /schemas/types.yaml#/definitions/uint32-matrix
> > + items:
> > + items:
> > + - description: |
> > + "mux_reg" indicates the offset of mux register.
> > + - description: |
> > + "conf_reg" indicates the offset of pad configuration register.
> > + - description: |
> > + "input_reg" indicates the offset of select input register.
> > + - description: |
> > + "mux_val" indicates the mux value to be applied.
> > + - description: |
> > + "input_val" indicates the select input value to be applied.
> > + - description: |
> > + "pad_setting" indicates the pad configuration value to be
> applied.
> > +
> > + required:
> > + - reg
> > +
> > additionalProperties: false
> >
> > $defs:
> > @@ -401,6 +480,26 @@ examples:
> > scmi_powercap: protocol@18 {
> > reg = <0x18>;
> > };
> > +
> > + scmi_pinctrl: protocol@19 {
> > + reg = <0x19>;
> > + #pinctrl-cells = <0>;
>
> Missing compatible. Schema should catch that...
Only i.MX need compatible here.
Thanks,
Peng.
>
> > +
> > + i2c2-pins {
> > + groups = "i2c2_a", "i2c2_b";
> > + function = "i2c2";
> > + };
> > +
> > + mdio-pins {
> > + groups = "avb_mdio";
> > + drive-strength = <24>;
> > + };
> > +
> > + keys_pins: keys-pins {
> > + pins = "GP_5_17", "GP_5_20", "GP_5_22", "GP_2_1";
> > + bias-pull-up;
> > + };
> > + };
> > };
> > };
> >
> >
> > --
> > 2.37.1
> >