linux-kernel - Re: [PATCH v3 1/5] dt-bindings: leds: Add binding for qcom-spmi-flash

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Date:   Wed, 11 Aug 2021 12:35:59 -0600
From:   Rob Herring <robh@...nel.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
Cc:     Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-leds@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Brian Masney <masneyb@...tation.org>,
        Luca Weiss <luca@...tu.xyz>,
        Russell King <linux@...linux.org.uk>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, ~lkcamp/patches@...ts.sr.ht,
        André Almeida <andrealmeid@...labora.com>,
        kernel@...labora.com
Subject: Re: [PATCH v3 1/5] dt-bindings: leds: Add binding for qcom-spmi-flash

On Tue, Aug 03, 2021 at 01:26:37PM -0300, Nícolas F. R. A. Prado wrote:
> Add devicetree binding for Qualcomm's SPMI Flash LEDs which are part of
> the PM8941 PMIC. These LEDs are used both as lantern and camera flash on
> phones based on the MSM8974 SoC, like the Nexus 5.
> 
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> ---
> 
> Changes in v3:
> - Removed clamp-curr, headroom, startup-dly and safety-timer properties since
>   they didn't impact the behavior. They're now hardcoded in the driver (patch 2)
> - Added valid ranges for led-max-microamp, flash-max-microamp and
>   flash-max-timeout-us
> - Removed dt-bindings header file that held some constants (moved to inside the
>   driver in patch 2)
> 
> Added in v2
> 
>  .../bindings/leds/leds-qcom-spmi-flash.yaml   | 93 +++++++++++++++++++
>  1 file changed, 93 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml
> new file mode 100644
> index 000000000000..da674d73c033
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml
> @@ -0,0 +1,93 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-qcom-spmi-flash.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm SPMI Flash LEDs
> +
> +maintainers:
> +  - Nícolas F. R. A. Prado <n@...aprado.net>
> +
> +description: |
> +  The Qualcomm SPMI Flash LEDs are part of Qualcomm PMICs and are used primarily
> +  as a camera or video flash. They can also be used as a lantern when on torch
> +  mode.
> +  The PMIC is connected to Host processor via SPMI bus.
> +
> +properties:
> +  compatible:
> +    const: qcom,spmi-flash-leds
> +
> +  reg:
> +    maxItems: 1
> +
> +  flash-boost-supply:
> +    description: SMBB regulator for LED flash mode
> +
> +  torch-boost-supply:
> +    description: SMBB regulator for LED torch mode
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +patternProperties:
> +  "^led@[0-1]$":
> +    type: object
> +    $ref: common.yaml#
> +
> +    properties:
> +      reg:
> +        maxItems: 1

Instead of maxItems, this would be a bit more specific:

enum: [ 0, 1 ]

With that,

Reviewed-by: Rob Herring <robh@...nel.org>

> +
> +      led-max-microamp:
> +        minimum: 12500
> +        maximum: 200000
> +        multipleOf: 12500
> +
> +      flash-max-microamp:
> +        minimum: 12500
> +        maximum: 1000000
> +        multipleOf: 12500
> +
> +      flash-max-timeout-us:
> +        minimum: 10000
> +        maximum: 1280000
> +        multipleOf: 10000
> +
> +    required:
> +      - reg
> +
> +required:
> +  - compatible
> +  - reg
> +  - flash-boost-supply
> +  - torch-boost-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    spmi-flash-leds@...0 {
> +        compatible = "qcom,spmi-flash-leds";
> +        reg = <0xd300 0x100>;
> +        flash-boost-supply = <&pm8941_5vs1>;
> +        torch-boost-supply = <&pm8941_5v>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        led@0 {
> +            reg = <0>;
> +            function = LED_FUNCTION_FLASH;
> +            color = <LED_COLOR_ID_WHITE>;
> +            led-max-microamp = <200000>;
> +            flash-max-microamp = <1000000>;
> +            flash-max-timeout-us = <1280000>;
> +        };
> +    };
> +...
> -- 
> 2.32.0
> 
>