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dt-bindings: pinctrl: stm32: Support I/O synchronization parameters

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Document the support of the I/O synchronization parameters:
- skew-delay-input-ps;
- skew-delay-output-ps;
- st,io-sync.

Forbid 'skew-delay-input-ps' and 'skew-delay-output-ps' to be both
present on the same pin.
Allow the new properties only with compatibles that support them.
Add an example that uses the new properties.

Co-developed-by: Fabien Dessenne <fabien.dessenne@foss.st.com>
Signed-off-by: Fabien Dessenne <fabien.dessenne@foss.st.com>
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Antonio Borneo
2025-10-23 15:26:59 +02:00
committed by Linus Walleij
parent cf7a3d4d3f
commit a730bf753e
1 changed files with 74 additions and 0 deletions
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74
Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
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@@ -220,12 +220,65 @@ patternProperties:
minimum: 0
maximum: 3
skew-delay-input-ps:
description: |
IO synchronization skew rate applied to the input path
enum: [0, 300, 500, 750, 1000, 1250, 1500, 1750, 2000, 2250, 2500, 2750, 3000, 3250]
skew-delay-output-ps:
description: |
IO synchronization latch delay applied to the output path
enum: [0, 300, 500, 750, 1000, 1250, 1500, 1750, 2000, 2250, 2500, 2750, 3000, 3250]
st,io-sync:
$ref: /schemas/types.yaml#/definitions/string
enum:
- pass-through
- clock inverted
- data on rising edge
- data on falling edge
- data on both edges
description: |
IO synchronization through re-sampling or inversion
"pass-through" - data or clock GPIO pass-through
"clock inverted" - clock GPIO inverted
"data on rising edge" - data GPIO re-sampled on clock rising edge
"data on falling edge" - data GPIO re-sampled on clock falling edge
"data on both edges" - data GPIO re-sampled on both clock edges
default: pass-through
required:
- pinmux
# Not allowed both skew-delay-input-ps and skew-delay-output-ps
if:
required:
- skew-delay-input-ps
then:
properties:
skew-delay-output-ps: false
allOf:
- $ref: pinctrl.yaml#
- if:
not:
properties:
compatible:
contains:
enum:
- st,stm32mp257-pinctrl
- st,stm32mp257-z-pinctrl
then:
patternProperties:
'-[0-9]*$':
patternProperties:
'^pins':
properties:
skew-delay-input-ps: false
skew-delay-output-ps: false
st,io-sync: false
required:
- compatible
- '#address-cells'
@@ -306,4 +359,25 @@ examples:
pinctrl-names = "default";
};
- |
#include <dt-bindings/pinctrl/stm32-pinfunc.h>
//Example 4 skew-delay and st,io-sync
pinctrl: pinctrl@44240000 {
compatible = "st,stm32mp257-pinctrl";
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0x44240000 0xa0400>;
eth3_rgmii_pins_a: eth3-rgmii-0 {
pins1 {
pinmux = <STM32_PINMUX('A', 6, AF14)>;
st,io-sync = "data on both edges";
};
pins2 {
pinmux = <STM32_PINMUX('H', 2, AF14)>;
skew-delay-output-ps = <500>;
};
};
};
...