linux-kernel - Re: [PATCH v6 1/2] dt-bindings: leds: Add bindings for MT6360 LED

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Message-ID: <ff327630-d919-c26c-30ca-066ad8e826bb@gmail.com>
Date:   Tue, 17 Nov 2020 23:24:52 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Gene Chen <gene.chen.richtek@...il.com>, pavel@....cz,
        robh+dt@...nel.org, matthias.bgg@...il.com
Cc:     dmurphy@...com, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        gene_chen@...htek.com, Wilma.Wu@...iatek.com,
        shufan_lee@...htek.com, cy_huang@...htek.com,
        benjamin.chao@...iatek.com
Subject: Re: [PATCH v6 1/2] dt-bindings: leds: Add bindings for MT6360 LED

Hi Gene,

Thank you for the patch.

On 11/17/20 11:55 AM, Gene Chen wrote:
> From: Gene Chen <gene_chen@...htek.com>
> 
> Add bindings document for LED support on MT6360 PMIC
> 
> Signed-off-by: Gene Chen <gene_chen@...htek.com>
> ---
>   .../devicetree/bindings/leds/leds-mt6360.yaml      | 114 +++++++++++++++++++++
>   1 file changed, 114 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-mt6360.yaml b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> new file mode 100644
> index 0000000..871db4d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> @@ -0,0 +1,114 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-mt6360.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LED driver for MT6360 PMIC from MediaTek Integrated.
> +
> +maintainers:
> +  - Gene Chen <gene_chen@...htek.com>
> +
> +description: |
> +  This module is part of the MT6360 MFD device.
> +  see Documentation/devicetree/bindings/mfd/mt6360.yaml
> +  Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
> +  and 4-channel RGB LED support Register/Flash/Breath Mode

What actually is the Register mode?

> +
> +properties:
> +  compatible:
> +    const: mediatek,mt6360-led
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +patternProperties:
> +  "^led@[0-6]$":
> +    type: object
> +    $ref: common.yaml#
> +    description:
> +      Properties for a single LED.
> +
> +    properties:
> +      reg:
> +        description: Index of the LED.
> +        enum:
> +          - 0 # LED output INDICATOR1_RED
> +          - 1 # LED output INDICATOR1_GREEN
> +          - 2 # LED output INDICATOR1_BLUE
> +          - 3 # LED output INDICATOR2_ML
> +          - 4 # LED output FLED1
> +          - 5 # LED output FLED2
> +          - 6 # LED output MULTICOLOR
> +
> +unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> +   #include <dt-bindings/leds/common.h>
> +   led-controller {
> +     compatible = "mediatek,mt6360-led";
> +     #address-cells = <1>;
> +     #size-cells = <0>;
> +
> +     led@0 {
> +       reg = <0>;
> +       function = LED_FUNCTION_INDICATOR;
> +       color = <LED_COLOR_ID_RED>;
> +       led-max-microamp = <24000>;
> +     };
> +     led@3 {
> +       reg = <3>;
> +       function = LED_FUNCTION_INDICATOR;
> +       color = <LED_COLOR_ID_AMBER>;

You should really have here LED_COLOR_ID_MOONLIGHT if this is
a moonlight LED. You'll need to add it to dt-bindings/leds/common.h.

> +       led-max-microamp = <150000>;
> +     };
> +     led@4 {
> +       reg = <4>;
> +       function = LED_FUNCTION_FLASH;
> +       color = <LED_COLOR_ID_WHITE>;
> +       function-enumerator = <1>;
> +       led-max-microamp = <200000>;
> +       flash-max-microamp = <500000>;
> +       flash-max-timeout-us = <1024000>;
> +     };
> +     led@5 {
> +       reg = <5>;
> +       function = LED_FUNCTION_FLASH;
> +       color = <LED_COLOR_ID_WHITE>;
> +       function-enumerator = <2>;
> +       led-max-microamp = <200000>;
> +       flash-max-microamp = <500000>;
> +       flash-max-timeout-us = <1024000>;
> +     };
> +     led@6 {
> +       reg = <6>;
> +       function = LED_FUNCTION_INDICATOR;
> +       color = <LED_COLOR_ID_MULTI>;
> +       led-max-microamp = <24000>;
> +       #address-cells = <1>;
> +       #size-cells = <0>;
> +
> +       led@1 {
> +         reg = <1>;
> +         function = LED_FUNCTION_INDICATOR;
> +         color = <LED_COLOR_ID_GREEN>;
> +       };
> +       led@2 {
> +         reg = <2>;
> +         function = LED_FUNCTION_INDICATOR;
> +         color = <LED_COLOR_ID_BLUE>;
> +       };
> +     };

It is of little avail to have multicolor LED with only two LEDs.
I propose not to allow such setup - i.e. you should have either
one multicolor LED comprising three sub-LEDs (regs: 0, 1, 2),
and with main color property set to LED_COLOR_ID_RGB, or three separate
LEDs.

Effectively, you should have two separate DT examples here to make it
clear: one for the case with three LED class devices and one with
LED multicolor class device.

> +   };
> +...
> 

-- 
Best regards,
Jacek Anaszewski