linux-kernel - Re: [PATCH v2 7/7] leds: leds-mt6323: Add support for WLEDs and MT6332

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Date:   Thu, 13 Apr 2023 13:29:46 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Pavel Machek <pavel@....cz>
Cc:     lee@...nel.org, sean.wang@...iatek.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.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,
        kernel@...labora.com
Subject: Re: [PATCH v2 7/7] leds: leds-mt6323: Add support for WLEDs and
 MT6332

Il 13/04/23 13:06, Pavel Machek ha scritto:
> Hi!
> 
>> Add basic code to turn on and off WLEDs and wire up MT6332 support
>> to take advantage of it.
>> This is a simple approach due to to the aforementioned PMIC supporting
>> only on/off status so, at the time of writing, it is impossible for me
>> to validate more advanced functionality due to lack of hardware.
> 
> 
>> @@ -467,14 +590,24 @@ static int mt6323_led_probe(struct platform_device *pdev)
>>   			goto put_child_node;
>>   		}
>>   
>> +		is_wled = of_property_read_bool(child, "mediatek,is-wled");
>> +
> 
> This needs documenting in the binding, no?
> 
>> +static const struct mt6323_hwspec mt6332_spec = {
>> +	/* There are no LEDs in MT6332. Only WLEDs are present. */
> 
> "Only WLED is present"?
> 
>> +	.max_leds = 0,
>> +	.max_wleds = 1,
>> +	.max_brightness = 1024,
>> +};
>> +
> 
> Is there chip with both LED and WLEDs? (I'm wondering if this makes
> sense in single driver).
> 

Some PMICs have got both LED(s) and WLED(s), yes - this is only on smartphone
designs though.

Regards,
Angelo