The LTC7871 is a bidirectional buck or boost
switching regulator controller that operates in
either buck or boost mode on demand. Add
corresponding DT bindings.
Signed-off-by: Celine Joy A. Capua <celinejoy.capua@analog.com>
---
.../bindings/regulator/adi,ltc7871-regulator.yaml | 98 ++++++++++++++++++++++
1 file changed, 98 insertions(+)
diff --git a/Documentation/devicetree/bindings/regulator/adi,ltc7871-regulator.yaml b/Documentation/devicetree/bindings/regulator/adi,ltc7871-regulator.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..b1ae8b16e19c11b3faf2d4a41a4ae4f615ca3c1e
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/adi,ltc7871-regulator.yaml
@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright (c) 2025 Analog Devices, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/adi,ltc7871-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LTC7871 Buck-Boost Voltage Regulator
+maintainers:
+ - Celine Joy Capua <celinejoy.capua@analog.com>
+
+description:
+ The LTC7871 is a high performance bidirectional buck or boost switching
+ regulator controller that operates in either buck or boost mode on demand.
+ It regulates in buck mode from VHIGH-to-VLOW and boost mode from
+ VLOW-to-VHIGH depending on a control signal, making it ideal for 48V/12V
+ automotive dual battery systems
+properties:
+ compatible:
+ enum:
+ - adi,ltc7871
+ - adi,ltc7872
+
+ reg:
+ maxItems: 1
+
+ adi,enable-chip-ctrl-wp:
+ description: If present, this indicates the use of regulator's
+ internal write protection.
+ type: boolean
+
+ adi,ra-external-ohms:
+ description: External Resistor used to compute the value of
+ programmable VLOW in buck mode.
+ default: 10000
+
+ adi,rb-external-ohms:
+ description: External Resistor used to compute the value of
+ programmable VLOW in buck mode.
+ default: 107000
+
+ adi,rc-external-ohms:
+ description: External Resistor used to compute the value of
+ programmable VHIGH in boost mode.
+ default: 12700
+
+ adi,rd-external-ohms:
+ description: External Resistor used to compute the value of
+ programmable VHIGH in boost mode.
+ default: 499000
+
+ adi,idac-setcur-microamp:
+ description: Adjusts the IDAC_SETCUR to program SETCUR
+ pin's sourcing current.
+ minimum: -63
+ maximum: 64
+ default: 0
+
+ adi,freq-spread-percentage:
+ description: Sets the range of modulation with respect to the
+ switching frequency.
+ enum: [+-12%, +-15%, +-10%, +-8%]
+ default: +-12%
+
+ adi,switching-freq-divider:
+ description: The factor at which the switching frequency is
+ divided to get the modulation frequency.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [512, 1024, 2048, 4096, 256, 128, 64]
+ default: 512
+
+required:
+ - compatible
+ - reg
+
+allOf:
+ - $ref: regulator.yaml#
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ regulator@0 {
+ compatible = "adi,ltc7871";
+ reg = <0>;
+ adi,ra-external-ohm = <10000>;
+ adi,rb-external-ohm = <107000>;
+ adi,rc-external-ohm = <12700>;
+ adi,rd-external-ohm = <499000>;
+ adi,idac-setcur-microamp = <0>;
+ adi,freq-spread-percentage = "+-12%";
+ adi,switching-freq-divider = <512>;
+ };
+ };
--
2.34.1On Mon, Feb 10, 2025 at 10:30:53AM +0800, Celine Joy A. Capua wrote: > The LTC7871 is a bidirectional buck or boost > switching regulator controller that operates in > either buck or boost mode on demand. Add > corresponding DT bindings. This fails tests, so limited review follows. Please wrap commit message according to Linux coding style / submission process (neither too early nor over the limit): https://elixir.bootlin.com/linux/v6.4-rc1/source/Documentation/process/submitting-patches.rst#L597 Please use subject prefixes matching the subsystem. You can get them for example with 'git log --oneline -- DIRECTORY_OR_FILE' on the directory your patch is touching. For bindings, the preferred subjects are explained here: https://www.kernel.org/doc/html/latest/devicetree/bindings/submitting-patches.html#i-for-patch-submitters > > Signed-off-by: Celine Joy A. Capua <celinejoy.capua@analog.com> > --- > .../bindings/regulator/adi,ltc7871-regulator.yaml | 98 ++++++++++++++++++++++ > 1 file changed, 98 insertions(+) > > diff --git a/Documentation/devicetree/bindings/regulator/adi,ltc7871-regulator.yaml b/Documentation/devicetree/bindings/regulator/adi,ltc7871-regulator.yaml > new file mode 100644 > index 0000000000000000000000000000000000000000..b1ae8b16e19c11b3faf2d4a41a4ae4f615ca3c1e > --- /dev/null > +++ b/Documentation/devicetree/bindings/regulator/adi,ltc7871-regulator.yaml > @@ -0,0 +1,98 @@ > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > +# Copyright (c) 2025 Analog Devices, Inc. > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/regulator/adi,ltc7871-regulator.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Analog Devices LTC7871 Buck-Boost Voltage Regulator Blank line > +maintainers: > + - Celine Joy Capua <celinejoy.capua@analog.com> > + > +description: > + The LTC7871 is a high performance bidirectional buck or boost switching > + regulator controller that operates in either buck or boost mode on demand. > + It regulates in buck mode from VHIGH-to-VLOW and boost mode from > + VLOW-to-VHIGH depending on a control signal, making it ideal for 48V/12V > + automotive dual battery systems Blank line. Open existing bindings and see how it is done there. > +properties: > + compatible: > + enum: > + - adi,ltc7871 > + - adi,ltc7872 Are devices compatible? > + > + reg: > + maxItems: 1 > + > + adi,enable-chip-ctrl-wp: > + description: If present, this indicates the use of regulator's > + internal write protection. > + type: boolean > + > + adi,ra-external-ohms: > + description: External Resistor used to compute the value of > + programmable VLOW in buck mode. > + default: 10000 > + > + adi,rb-external-ohms: > + description: External Resistor used to compute the value of > + programmable VLOW in buck mode. > + default: 107000 > + > + adi,rc-external-ohms: > + description: External Resistor used to compute the value of > + programmable VHIGH in boost mode. > + default: 12700 > + > + adi,rd-external-ohms: > + description: External Resistor used to compute the value of > + programmable VHIGH in boost mode. > + default: 499000 > + > + adi,idac-setcur-microamp: > + description: Adjusts the IDAC_SETCUR to program SETCUR > + pin's sourcing current. > + minimum: -63 > + maximum: 64 > + default: 0 > + > + adi,freq-spread-percentage: > + description: Sets the range of modulation with respect to the > + switching frequency. > + enum: [+-12%, +-15%, +-10%, +-8%] That's something new. Where is such property suffix defined? > + default: +-12% > + > + adi,switching-freq-divider: > + description: The factor at which the switching frequency is > + divided to get the modulation frequency. > + $ref: /schemas/types.yaml#/definitions/uint32 > + enum: [512, 1024, 2048, 4096, 256, 128, 64] Keep this ordered by increasing value. > + default: 512 > + > +required: > + - compatible > + - reg Best regards, Krzysztof
On Mon, 10 Feb 2025 10:30:53 +0800, Celine Joy A. Capua wrote:
> The LTC7871 is a bidirectional buck or boost
> switching regulator controller that operates in
> either buck or boost mode on demand. Add
> corresponding DT bindings.
>
> Signed-off-by: Celine Joy A. Capua <celinejoy.capua@analog.com>
> ---
> .../bindings/regulator/adi,ltc7871-regulator.yaml | 98 ++++++++++++++++++++++
> 1 file changed, 98 insertions(+)
>
My bot found errors running 'make dt_binding_check' on your patch:
yamllint warnings/errors:
dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/regulator/adi,ltc7871-regulator.example.dtb: regulator@0: Unevaluated properties are not allowed ('adi,ra-external-ohm', 'adi,rb-external-ohm', 'adi,rc-external-ohm', 'adi,rd-external-ohm' were unexpected)
from schema $id: http://devicetree.org/schemas/regulator/adi,ltc7871-regulator.yaml#
doc reference errors (make refcheckdocs):
See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20250210-staging-ltc7871-v1-2-c593ad86aab2@analog.com
The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.
If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:
pip3 install dtschema --upgrade
Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.
© 2016 - 2026 Red Hat, Inc.