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SubjectRe: [PATCH v2 1/2] dt-bindings: Add power-efuse binding
On Mon, Mar 07, 2022 at 05:18:09PM -0800, Zev Weiss wrote:
> This can be used to describe a power output supplied by a regulator
> device that the system controls.
>
> Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
> ---
> .../devicetree/bindings/misc/power-efuse.yaml | 49 +++++++++++++++++++
> 1 file changed, 49 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/misc/power-efuse.yaml
>
> diff --git a/Documentation/devicetree/bindings/misc/power-efuse.yaml b/Documentation/devicetree/bindings/misc/power-efuse.yaml
> new file mode 100644
> index 000000000000..5f8f0b21af0e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/power-efuse.yaml
> @@ -0,0 +1,49 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/misc/power-efuse.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic power efuse device
> +
> +maintainers:
> + - Zev Weiss <zev@bewilderbeest.net>
> +
> +description: |
> + This binding describes a physical power output supplied by a
> + regulator providing efuse functionality (manual on/off control, and
> + auto-shutoff if current, voltage, or thermal limits are exceeded).
> +
> + These may be found on systems such as "smart" network PDUs, and
> + typically supply power to devices entirely separate from the system
> + described by the device-tree by way of an external connector such as
> + an Open19 power cable:
> +
> + https://www.open19.org/marketplace/coolpower-cable-assembly-8ru/

Not really a helpful link...

I still don't understand what the h/w looks like here. At least I now
understand we're talking a fuse on power rail, not efuses in an SoC
used as OTP bits or feature disables.

> +
> +properties:
> + compatible:
> + const: power-efuse
> +
> + vout-supply:
> + description:
> + phandle to the regulator providing power for the efuse

Vout is a supply to the efuse and not the rail being fused?

Sorry, I know nothing about how an efuse is implemented so you are going
to have to explain or draw it.

> +
> + error-flags-cache-ttl-ms:
> + description:
> + The number of milliseconds the vout-supply regulator's error
> + flags should be cached before re-fetching them.

How does one fetch/read? the error flags?

> +
> +required:
> + - compatible
> + - vout-supply
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + efuse {
> + compatible = "power-efuse";
> + vout-supply = <&efuse_reg>;
> + error-flags-cache-ttl-ms = <500>;
> + };
> --
> 2.35.1
>
>

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